Relevant bibliographies by topics / Alumina Catalyst

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Alumina Catalyst'

Author: Grafiati
Published: 5 June 2025
Last updated: 24 June 2025

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Journal articles on the topic "Alumina Catalyst"

1

Panyathanmaporn, Thammarat, Angkhana Jaroenworaluck, Sitthisuntorn Supothina, et al. "Ag-Doped TiO2 Immobilized on Al2O3 Bead as Oxidation Catalyst." Materials Science Forum 544-545 (May 2007): 13–16. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.13.

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Ag-doped TiO2 catalyst employed as the oxidation catalyst candidate was prepared by two methods, co-precipitation and dip coating method. Co-precipitation method was conducted by adding AgNO3 into the titanium precursor before gelation and then the obtained solution was coated on the alumna beads. Dip coating method was conducted by coating the first layer on alumina beads with titanium precursor followed by coating the second layer with AgNO3. The fired Ag-doped TiO2 coated on alumina beads was used as catalyst for catalytic oxidation of methanol and carbon monoxide by using oxygen as oxidizing agent in a gas-phase reactor. The methods of catalyst preparation were found to affect the catalytic efficiency. Dip coating method showed better oxidation reaction as Ag-doped TiO2 catalysts were well dispersed on the alumina beads.
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Ayoub, Muhammad, Abrar Inayat, Sintayehu Mekuria Hailegiorgis, and Aamir Hussain Bhat. "Synthesis of Alumina Based Alkaline Catalyst for Biodiesel-Derived Glycerol to Polyglycerol." Advanced Materials Research 1133 (January 2016): 33–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.33.

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Biodiesel which comes from pure renewable resources provide an alternative fuel option for future. The rapid growth of the biodiesel industry will result in overproduction of less value glycerol and create a superfluity of this impure by-product. The synthesis of alkaline alumina catalyst for polyglycerol production via solvent free base-catalyzed etherification of low value glycerol is reported. The etherification of biodiesel derived glycerol to polyglycerol was studied in a heterogeneous catalysis under solvent free system, using alkalines over γ – alumina catalysts. All the catalysts were prepared by incipient-wetness impregnation of an aqueous solution of alkaline compounds on γ – alumina as a support. The effects of alkaline compound, reaction temperature, catalyst amount, and reaction time in conversion of glycerol to polyglycerol were investigated. The catalyst with potassium loaded on γ -alumina gave the highest basicity and the best catalytic activity for this reaction. The highest glycerol conversion into polyglycerol production was obtained with high yield 79.5% over prepared catalyst respectively. Industrially, the findings attained in this study might contribute towards promoting the biodiesel industry through utilization of its by-products.
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Ulfah, Maria, and Subagjo Subagjo. "PENGARUH PERBEDAAN SIFAT PENYANGGA ALUMINA TERHADAP SIFAT KATALIS HYDROTREATING BERBASIS NIKEL-MOLIBDENUM." Reaktor 14, no. 2 (2012): 151. http://dx.doi.org/10.14710/reaktor.14.2.151-157.

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EFFECT OF ALUMINA SUPPORT PROPERTIES ON THE NICKEL-MOLIBDENUM BASE HYDROTREATING CATALYST. Effect of surface characteristics of three species of synthesized γ-alumina (alumina-1, alumina-2 and alumina-3) on characteristics NiMo catalysts has been studied. Those aluminas are derived from boehmite Catapal B by varying rasio mol nitric acid to boehmite. A sol-gel method is used to synthesize γ-Al2O3 support. The Nitrogen adsorption, X-ray diffraction (XRD), Temperature Programmed Reduction (TPR) of H2, Temperature Programmed Desorption (TPD) of NH3, and mechanical strength are used to characterize the supports and catalysts. The results showed that the surface area alumina affects the formation of crystalline MoO3 in the NiMo catalyst, while γ-Al2O3-3 support which has the highest surface area (about 195 m2/g) compared to the other two types of alumina (>195 m2/g) does not have a crystalline MoO3. The formation of crystalline MoO3 is not influenced by the acidity alumina. Based on the results of XRD, it is indicated that the supported alumina-3 NiMo catalyst (having the highest acid strength) shows that there is no presence of crystalline MoO3. Pore size distribution of support did not change significantly after the deposition of Ni and Mo oxides. Mechanical strength of support also affects the strength NiMo catalyst. Support alumina-3 which has the highest mechanical strength gives the mechanical strength of the highest NiMo catalyst. Pengaruh sifat penyangga γ-alumina hasil pengembangan (alumina-1, alumina-2 dan alumina-3) pada karakter katalis hydrotreating nikel-molibdenum (NiMo) telah dipelajari. Ketiga jenis γ-alumina diturunkan dari boehmite “Catapal B” dengan menvariasikan nisbah mol asam nitrat terhadap boehmite. Pembuatan γ-alumina menggunakan metoda sol-gel. Adsorpsi Nitrogen, X-ray difraksi (XRD), Temperature Programmed Reduction (TPR) H2, Temperature Programmed Desorption (TPD) NH3, dan kekuatan mekanik digunakan untuk mengkarakterisasi penyangga dan katalis. Hasil penelitian menunjukan bahwa luas permukaan alumina mempengaruhi pembentukan kristalin MoO3 dalam katalis NiMo. Pada penyangga alumina-3 yang memiliki luas permukaan yang paling tinggi (sekitar 195 m2/g) di banding dua jenis alumina lainnya (>195 m2/g) tidak memiliki kristalin MoO3. Pembentukan kristalin MoO3 tidak dipengaruhi oleh sifat keasaman alumina. Berdasarkan hasil XRD ditunjukan bahwa pada katalis NiMo berpenyangga alumina-3 (memiliki kekuatan asam yang paling tinggi) tidak terdapat adanya kristalin MoO3. Distribusi ukuran pori peyangga tidak berubah signifikan setelah deposisi oksida Ni dan Mo. Kekuatan mekanik penyangga mempengaruhi pula kekuatan katalis NiMo. Penyangga γ Al2O3-3 yang memiliki kekuatan mekanik yang paling tinggi memberikan kekuatan mekanik katalis NiMo yang tertinggi.
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Bukhzam, A., A. Benhmid, K. Edbey, S. Elsahli, G. A. H. Mekhemer, and M. I. Zaki. "decomposition of 2-propanol over Alumina supported Thoria and Potassium ion modified catalysts." Libyan Journal of Science &Technology 7, no. 1 (2022): 1–4. http://dx.doi.org/10.37376/ljst.v7i1.2302.

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A series of alumina and K ion modified supported thoria catalysts were prepared using thorium nitrate hexahydrate at different loading levels (3–20 wt% of thoria) by the impregnating method. The decomposition of 2-propanol on the surface of these catalysts was investigated. Pure g-alumina catalyst shows low activity and higher selectivity towards dehydration reaction. In contrast, thoria catalyst shows low activity and higher selectivity towards dehydrogenation reaction. The activity and selectivity of alumina supported thoria catalyst towards dehydrogenation reaction was increased with increasing the amount of ThO2 on g-alumina. However, the activity and selectivity of these catalysts towards dehydration reaction were observed to be decreased with increasing the amount of ThO2. The surface of dehydrogenation reaction of 2-propanol was increased with increasing the addition of K ion on the surface of alumina supported thoria catalysts.
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Gan, Yan Ling, Su Ping Cui, Xiao Yu Ma, and Ya Li Wang. "Effect of Silica-Alumina Ratio of Catalysts on NO Decomposition Rate in Cement Kiln Exhaust." Materials Science Forum 993 (May 2020): 1450–55. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1450.

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In order to deal with the pollution of NO in cement kiln exhaust, the study of NO catalytic decomposition catalyst obtained much more attention. The effect of silica-alumina ratio on NO decomposition rate in cement kiln without other reductant was studied. The NO decomposition rate of catalysts with different silica-alumina ratio was determined by infrared spectrometer. And pore structures and the microstructure of the catalyst were characterized separately by BET surface area, nitrogen adsorption-desorption and XRD. The results show that silica-alumina ratio of catalyst was preferred to be 50 with the best NO decomposition rate when the temperature was below 300 °C. The catalyst with silica-alumina ratio of 60 has the higher catalytic activity when the temperature was higher than 300 °C, and the decomposition rate achieved 70% at 600 °C. XRD results shows the crystallinity of catalysts increased as the silica-alumina ratio increased. BET surface area and the cumulative pore volume of catalysts gradually increased, and the average pore diameter gradually reduced with the increase of silica-alumina ratio.
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Čapek, Libor, Lukáš Vaněk, Lucie Smoláková, Roman Bulánek, and Jiří Adam. "The Feasibility of Ni-Alumina Catalysts in Oxidative Dehydrogenation of Ethane." Collection of Czechoslovak Chemical Communications 73, no. 8-9 (2008): 1177–91. http://dx.doi.org/10.1135/cccc20081177.

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The contribution deals with the development on the efficient Ni-alumina catalyst for the oxidative dehydrogenation (ODH) of ethane to ethene. The performance of Ni-alumina catalysts with varying nickel loadings and with thermal pretreatment was studied. We contribute to the understanding of the relationship between the activity of nickel species in ODH of ethane and its distribution. To analyze this effect, Ni-alumina catalysts were analyzed by UV-VIS spectroscopy, and H2-TPR profile. Ni-alumina catalysts were highly active and selective (ca. 80%) in the ODH of ethane. The catalysts contained both tetrahedral and octahedral nickel species, suggesting that nickel aluminate represented a partial spinel, where Ni(II) ions occupy both octahedral and tetrahedral sites of the oxygen lattice. It was suggested that the octahedral nickel species were more active than the tetrahedral ones.
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Iftitah, Elvina Dhiaul, Hardjono Sastrohamidjojo та M. Muchalal. "STUDY OF CATALYTIC CYCLISATION OF (+)-CITRONELLAL WITH Zn/γ-ALUMINA AS CATALYST". Indonesian Journal of Chemistry 4, № 3 (2010): 192–96. http://dx.doi.org/10.22146/ijc.21852.

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The reaction of catalytic cyclisation of (+)-citronellal has been done using g-alumina and Zn/γ-alumina as catalysts. Zn/γ-alumina catalyst was prepared by impregnation of ZnBr2 into solid of γ-alumina in methanol as a solvent. The calcination process is performed on Muchalal reactor at 400 oC. The reactions were carried out under nitrogen gas atmosphere by mixing 5 mL sample and 1.0 g catalyst at 90-95 oC for 3 hours. The product of reaction was analyzed using GC, FT-IR and GC-MS. The reaction of cyclization of (+)-citronellal with γ-alumina catalyst did not give targeted product as well as reaction with Zn/g-alumina catalyst. Whereas, the reactions with Zn/γ-alumina catalyst gave four compounds of isopulegol stereoisomer. Conversion of (-)-Isopulegol, (+)-Neoisopulegol, (+)-Isoisopulegol and (+)-Neoisoisopulegol were 64,29%, 18,80%, 9,20% and 3,32% respectively. For that reason, the transformation of (+)-sitronelal using Zn/γ-alumina was considered to be the best catalyst. A reaction mechanism is proposed where the (+)-citronellal molecule binds to a catalyst Lewis acid site via the aldehyde oxygen and the π-electrons of the double bond. Subsequent protonation of the aldehyde via a neighbouring Bronsted acid site initiates the cyclisation to isopulegol. Keywords: catalytic cyclisation, impregnation, (+)-isopulegol
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Kis, Erne, Matilda Lazic, and Goran Boskovic. "Catalyst component interactions in nickel/alumina catalyst." Acta Periodica Technologica, no. 38 (2007): 61–68. http://dx.doi.org/10.2298/apt0738061k.

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The influence of nickel loading (5; 10; 20 wt% Ni), temperature of heat treatment (400; 700; 1100?C) and way of catalyst preparation on the catalyst component interactions (CCI) in the impregnated, mechanical powder mixed and co-precipitated catalyst was investigated. For sample characterization, low temperature nitrogen adsorption (LTNA) and X-ray diffraction (XRD) were applied. Significant differences were revealed, concerning CCI in dependence of nickel loading, temperature of heat treatment and way of catalyst preparation. The obtained results show that the support metal oxide interactions (SMI) in impregnated and co-precipitated catalysts are more intensive than in the mechanical powder mixed catalyst. The degree and intensity of CCI is expressed by the ratio of real and theoretical surface area of the catalyst. This ratio can be used for a quantitative estimation of CCI and it is generally applicable to all types of heterogeneous catalysts.
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He, Lulu, Yuanhang Ren, Bin Yue, Shik Chi Edman Tsang, and Heyong He. "Tuning Metal–Support Interactions on Ni/Al2O3 Catalysts to Improve Catalytic Activity and Stability for Dry Reforming of Methane." Processes 9, no. 4 (2021): 706. http://dx.doi.org/10.3390/pr9040706.

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Ni-based catalysts supported on alumina derived from the pseudo-boehmite prepared by the impregnation method were employed for catalytic dry reforming of methane reaction at the temperature of 550–750 °C. The effect of calcination temperature on physicochemical properties such as the Ni dispersion, reduction degree, nickel crystallite sizes, and metal–support interaction of the catalysts was investigated. The characterization results show that increasing the catalyst calcination temperature leads to the formation of nickel-alumina spinel, which enhances the metal–support interaction and increases the reduction temperature. The nickel nanoparticle size decreases and the effective dispersion increases with the increasing calcination temperature from 450 °C to 750 °C due to the formation of nickel aluminate. The catalyst calcined at 750 °C exhibits the highest CH4 and CO2 conversion owing to the small Ni0 active sites and high Ni dispersion. In a 200 h stability test in dry reforming of methane at 700 °C, the Ni/Al2O3-750 catalyst exhibits excellent catalytic stability and anti-coking ability.
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Khan, Wasim Ullah, Mohammad Rizwan Khan, Rosa Busquets, and Naushad Ahmad. "Contribution of Oxide Supports in Nickel-Based Catalytic Elimination of Greenhouse Gases and Generation of Syngas." Energies 14, no. 21 (2021): 7324. http://dx.doi.org/10.3390/en14217324.

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Carbon dioxide and/or dry methane reforming serves as an effective pathway to mitigate these greenhouse gases. This work evaluates different oxide supports including alumina, Y-zeolite and H-ZSM-5 zeolite for the catalysis of dry reforming methane with Nickel (Ni). The composite catalysts were prepared by impregnating the supports with Ni (5%) and followed by calcination. The zeolite supported catalysts exhibited more reducibility and basicity compared to the alumina supported catalysts, this was assessed with temperature programmed reduction using hydrogen and desorption using carbon dioxide. The catalytic activity, in terms of CH4 conversion, indicated that 5 wt% Ni supported on alumina exhibited higher CH4 conversion (80.5%) than when supported on Y-zeolite (71.8%) or H-ZSM-5 (78.5%). In contrast, the H-ZSM-5 catalyst led to higher CO2 conversion (87.3%) than Y-zeolite (68.4%) and alumina (83.9%) supported catalysts. The stability tests for 9 h time-on-stream showed that Ni supported with H-ZSM-5 had less deactivation (just 2%) due to carbon deposition. The characterization of spent catalysts using temperature programmed oxidation (O2-TPO), X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA) revealed that carbon deposition was a main cause of deactivation and that it occurred in the lowest degree on the Ni H-ZSM-5 catalyst.
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Dissertations / Theses on the topic "Alumina Catalyst"

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Couroyer, Charlotte G. M. "Attrition of alumina catalyst carrier beads." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/843669/.

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Attrition of alumina catalyst carrier beads in reforming units causes operational problems and the loss of the catalyst particles due to the formation of fines and small fragments. This thesis addresses the characterisation and optimisation of the mechanical strength of these beads in collaboration with Institut Francais du Petrole (IFP) and Rhodia. A methodology was devised to test and improve the particle strength at various strain rates using both single particle and multiple particle tests by considering the mechanical stresses prevailing in industrial units. This methodology was tested with a commercial sample and then used to assess the strength of new samples for which the bead structure was modified by changing the filler concentration and type, the macroporosity, the drying regime and the surfactant concentration. A significant increase in the particle strength was achieved in comparison with the commercial samples. The mean crushing strength increased by a factor of about three and the extent of impact attrition was significantly decreased, e.g. by a factor of 30 for normal impacts at 20 m s-1. For single particle testing, a relationship between quasi-static and impact results was obtained when the impact breakage was compared with the percentage of weak particles obtained from the side crushing strength (SCS) test. This suggests that for this type of material the particle strength is not sensitive to the strain rate. Multiple particle tests confirmed the results obtained by single particle tests for two samples for which sufficient quantity of test material was available. In order to relate the extent of attrition in a particle assembly under compressive loading to the single particle properties, the BCS test was simulated by distinct element analysis using the TRUBAL code. Trends similar to the experimental work were obtained for the simulation of the attrition. However, the simulations tend to underestimate slightly the extent of attrition, which is highly dependent on the particle strength distribution and on the contact force distribution within the particle assembly. As a result of this work, the manufacture of the alumina catalyst carrier beads used in reforming units has been significantly improved.
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Stefanowicz-Pieta, Izabela. "1-butene isomerisation over silica-alumina catalyst." Thesis, University of Aberdeen, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487424.

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Reactions involving double-bond and skeletal isomerization of alkenes have been widely investigated, however, the relations between the activity and selectivity and strength or density of the acid sites are still not fully understood. Most authors believe that the reaction is catalysed by Bmnsted acid sites while others support the idea that Lewis sites can act in this reaction and discussion still exists as to the exact role of carbonaceous materials and of dimeric/ oligomeric intermediates. The double-bond isomerization of n-butene has been studied previously and it seems that an apparent correlation exists between selectivity and acidity or basicity of the catalyst. This reaction is considered to take place through a carboanionic or carbocationic mechanism. However until now the subject of surface acidity/basicity and its correlation with catalytic activity and also the mechanism of double bond isomerization reaction is still under debate. In order to investi~ate the correlation between activity and surface acidity silica-alumina catalysts were calcined at a range of temperature 300-550 °c in order to produce a series of samples with different Bmnsted and Lewis acid site densities. The numbe~ of acid sites was measured by combined FTIR/gravimetric measurements from the adsorption of2,6 and 2,4lutidine and pyridine. For each catalyst, a cycle of I-butene isomerization reactions was carried out. Reactions were performed using a fixed bed reactor under a constant flow of I ml/min of I-butene in total flow of the gases 100 ml/min. The only products of this reaction were cis-butene and trans-butene. This study indicates that amorphous silica-alumina is an active catalyst for double bond isomerization. In agreement with previously studies, no dimerization, oligomerization, coke or by-product formation was found under the reaction conditions selected. However deactivation is observed especially during the first 50 min of the reaction. The calculated activation energy of cis-butene formation was 48±5 kJ morl consistent with values reported in the literature. The work presented aims at establishing a relationships between the type, or types of acidity and number of sites, with the activity in the isomerisation reaction.
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Gopalan, Usha. "Hydrodenitrogenation of pyridine over alumina supported platinum catalyst." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ32537.pdf.

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Brinen, Jeffrey Lawrence. "The effects of nickel on an amorphous silica-alumina cracking catalyst." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/12060.

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Wilcock, Ian C. "Infrared studies of hydrocarbons on an alumina supported nickel catalyst." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/13231.

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The work described in this thesis concerns the adsorption and decomposition of small hydrocarbon molecules on the surface of an alumina supported nickel catalysts. The catalyst was prepared using a co-precipitation method and contained 25% nickel by weight. Temperature programmed reduction revealed that reduction at over 550<SUP>o</SUP>C in hydrogen was necessary in order to fully reduce the catalyst. Nickel surface area measurements were performed using hydrogen chemisorption and nitrous oxide decomposition, revealing an area of 30→45m^2/g. X ray diffraction and transmission electron microscopy showed an average nickel particle diameter of 13nm. Total catalyst surface area was measured by nitrogen adsorption at -196°C, giving a value of 250m^2/g for the as prepared catalyst. Infrared studies were performed using a combination of Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), with a standard Spectratech cell, and transmission infrared spectroscopy, with a home made infrared cell. A passivation procedure was developed so that pre-reduced catalyst could be transferred to the infrared cells and re-reduced <i>in situ</i> at 300°C. The adsorption and reaction of the two simple alkenes, ethene and propene were investigated at temperatures between 25 and 300°C. The room temperature surface chemistry of both molecules was dominated by the initial formation of alkylidyne species, ethylidyne (CCH_3) from ethene and propylidyne (CCH_2CH_3) from propene. The ethylidyne formed from ethene decayed to surface methyl (CH_3) and C_4 containing species. These were hydrogenated to methane and butane respectively. Ethylidyne itself was stable to hydrogenation. Methane was the only product released during temperature programming of the sample up to 300°C in helium. Propylidyne formed from propene decayed to ethylidyne, methyl and other C_3 and C_6 containing carbonaceous deposits. Hydrogenation produced methane and propane, leaving propylidyne and ethylidyne. Temperature programming of these species in helium produced only methane, and heating in hydrogen produced a small quantity of hexane in addition. After ethene adsorption, only 77% of the carbon deposited could be removed during re-reduction. Temperature programmed oxidation removed all of the carbon but substantial re-oxidation of the nickel catalyst occurred.
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Bueno, Alejandra. "Catalyst supports with hierarchical and radial porosity : preparation, characterization and catalytic evaluation." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1249.

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La grande majorité des procédés chimiques de transformation sont catalytiques. En catalyse hétérogène, les catalyseurs industriels sont des objets dont la taille est de l'ordre du millimétre au centimètre. Pour la plupart des catalyseurs, la phase active (ex: nanoparticules métallique) est dispersée dans un support mésoporeux ayant une surface spécifique élevé. Pour pallier au problème de limitation diffusionelle interne, on introduit dans le support un réseau secondaire de macropores qui permet d'améliorer la diffusion des substrats. Cependant, dans le cas où la réaction catalytique est particulièrement rapide, la diffusion à l'intérieur du support poreux peut rester limitante (Thiele modulus), entrainant une perte d'efficacité du catalyseur. L'objectif de ce travail de thèse est d'étudier l'efficacité d'un nouveau support alumine sous forme de bille dont la macroporosité est orientée de façon radiale. Afin de pouvoir quantifier le gain de cette nouvelle structure poreuse, des mesures d'activités pour deux réactions catalytiques modèles, l'oxydation de CO et le craquage de l'iso-octane, ont été réalisées et comparées à ceux de supports commerciaux et de références à porosité hiérarchisée. Pour les deux réactions, le nouveau support permet d'augmenter l'activité de 25 à 95% environ. Sur la base d'une caractérisation fine de la porosité des billes (adsorption N2-77k, porosimetrie à Hg, Tomographie RX), l'activité des catalyseurs a été modélisée. On conclut que le gain d'activité est essentiellement dû à la structuration radiale<br>The vast majority of chemical processes are catalytic. Within the heterogeneous catalysis, industrial catalysts are bodies whose size ranges between 1 mm to 1 cm. For most catalysts, the active phase (i.e. metal nanoparticles) is dispersed in a mesoporous support having a high specific surface area. To overcome the problem of internal diffusional limitation, a secondary network of macropores is introduced within the catalyst support. This improves the diffusion of substrates. However, in the case where the catalytic reaction is particularly fast, the diffusion inside the porous support can remain limiting (Thiele modulus), resulting in a loss of catalytic effectiveness. The objective of this thesis is to study the catalytic effectiveness of a new alumina-based support shaped into spherical pellets, owing a radial macroporosity. In order to quantify the impact of this new porous structure, two model catalytic reactions were chosen to test the catalysts: CO oxidation and isooctane cracking. The catalytic activity was compared to reference commercial supports owing hierarchical porosity. For both reactions, the new support with radial porosity increases the activity from 25 to 95% approximately. On the basis of a fine characterization of the porosity of the beads (adsorption N2-77k, porosimetry Hg, X-ray microtomography), the catalytic activities were modeled. We conclude that the impact on the catalytic activity is essentially due to the radial porous design
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Li, Haitao. "Supercritical carbon dioxide aided preparation of nickel oxide/alumina aerogel catalyst." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001090.

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Sawyer, John E. "The oxidation of volatile organic compounds on a platinum-alumina catalyst /." Access abstract and link to full text, 1995. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9529031.

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Swaminathan, Sneha. "Metal Oxide Nanofibers as Filters, Catalyst and Catalyst Support Structures." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279564885.

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Zhang, Qinglin. "Pore structure control and glow discharge treatment of alumina catalyst support material." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1409.

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Books on the topic "Alumina Catalyst"

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Whitty, Stephen. Infrared spectroscopic studies of a nickel alumina catalyst. University of East Anglia, 1985.

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Arifin, Juliana. Hydrogenation of canola oil using palladium/alumina catalyst. National Library of Canada, 1994.

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Li, Kong. Deactivation of silica-alumina catalyst during the cumene cracking reaction. University of Salford, 1988.

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G, Derouane E., ed. Microporous and mesoporous solid catalysts. Wiley, 2006.

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Morales, Wilfredo. Perfluoropolyalkylether decomposition on catalytic aluminas. National Aeronautics and Space Administration, 1994.

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Morales, Wilfredo. Perfluoropolyalkylether decomposition on catalytic aluminas. National Aeronautics and Space Administration, 1994.

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G, Derouane E., ed. Micro- and mesoporous solid catalysts. Wiley, 2006.

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Tagiev, D. B. Kristallicheskie ali͡u︡mosilikaty v katalize. Ėlm, 1989.

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Conny, Beth Mende. Coors, a catalyst for change: The pioneering of the aluminum can. Adolph Coors Co., 1990.

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Grant, Kenneth Alan. The characterisation, and activity of Pt-Sn / Alumina catalysts prepared by a novel sol route. Brunel University, 1992.

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Book chapters on the topic "Alumina Catalyst"

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Novaković, Tatjana B., Zorica M. Vuković, and Nadežda N. Jovanović. "The Stability of Porous Alumina Catalyst Support Against Sintering." In Advanced Science and Technology of Sintering. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4419-8666-5_50.

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Goupil, J. M., G. Clet, F. Hemming-Maire, et al. "Chlorinated Alumina Catalyst for Isobutane / 2-Butene Alkylation :Influence of Added Noble Metals." In Catalytic Activation and Functionalisation of Light Alkanes. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-0982-8_24.

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Centi, G., N. Passarini, S. Perathoner, and A. Riva. "Contemporaneous Removal of SO2and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst." In Environmental Catalysis. American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0552.ch019.

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Pedersen, L. A., J. A. Lowe, and C. K. Matocha. "Attrition- and Metal-Resistant Fluid Cracking Catalyst Prepared with Alumina Powder in the Matrix." In ACS Symposium Series. American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0411.ch038.

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Itkulova, Sh S. "The Bimetallic Co-Containing Supported on Alumina Catalysts in the Synthesis on the Base of Carbon Oxides." In Principles and Methods for Accelerated Catalyst Design and Testing. Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0554-8_28.

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de Vries, S., N. Voermann, T. Ma, B. Wasmund, J. Metric, and S. Kasinger. "Novel DC Furnace Design for Smelting Nickel and Cobalt Bearing Concentrate from Spent Alumina Catalyst." In Recycling of Metals and Engineercd Materials. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788073.ch68.

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Hunpinyo, Piyapong, Phavanee Narataruksa, Karn Pana-Suppamassadu, Sabaithip Tungkamani, Nuwong Chollacoop, and Hussanai Sukkathanyawat. "Effect of Reaction Conditions on the Catalytic Performance of Ruthenium Supported Alumina Catalyst for Fischer-Tropsch Synthesis." In Sustainability in Energy and Buildings. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36645-1_23.

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Murrell, Larry L., N. C. Dispenziere, and K. S. Kim. "Controlled Pore Size, High Alumina Content Silica—Aluminas." In Novel Materials in Heterogeneous Catalysis. American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0437.ch009.

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Robota, Heinz J., Jeremy Jones, Mingsheng Luo, and Amanda Stewart. "Hexadecane Hydrotreating as a Surrogate for Fischer-Tropsch Wax Upgrading to Aviation Fuel Using a Co/MoO3/Silica-Alumina Catalyst." In ACS Symposium Series. American Chemical Society, 2011. http://dx.doi.org/10.1021/bk-2011-1084.ch012.

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Davis, Burtron H. "Platinum—Tin—Alumina Catalysts." In ACS Symposium Series. American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0517.ch008.

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Conference papers on the topic "Alumina Catalyst"

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Paul, Larry, Bernd de Boer, and Helena Alves. "A Highly Corrosion Resistant and High Strength Alloy for Use in Mineral Processing." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10341.

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Alloy 602CA (UNS N06025) is a wrought nickel alloy with a combination of excellent corrosion resistance and high strength. These attributes make it ideal for use in high temperature processing of minerals. One particular application where this alloy is widely used is in fabricating calciner shells. The UNS N06025 has been used in calciners at continuous operating temperatures up to 1200°C (2192°F) in the processing of a variety of process streams. Corrosion resistance is achieved by alloying with high chromium levels (25% Cr) in combination with significant aluminum levels (2.2% Al); rare earth elements (Y and Zr) are also added to maintain adherence of the protective scale. This not only allows long life for the equipment, but also the minerals being processed are not contaminated by scale from alloy, which for example is particularly important when processing high purity alumina used for catalyst substrates. The high strength is achieved through a unique strengthening mechanism which uses a fine dispersion of primary carbides to achieve essentially a composite structure. The corrosion resistance of UNS N06025 is compared to other alloys in a variety of high temperature environments and several application examples are also given as a demonstration of the benefits provided by the features of this alloy.
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Korchuganova, Olena, Viktoriya Mokhonko, Eduard Potapenko, Krystyna Kanarova, Anastasiia Novikova, and Rafael Luque. "On Obtaining Nanomaterials from Industrial Waste." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-6vred7.

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A large number of critical raw materials are heavy metals. Heavy metals can be part of industrial waste and used to produce high-quality products. For the processing of industrial waste into nanosized materials, it is proposed to use the following directions: - conversion of waste into products with different quality requirements; - regeneration of waste to restore their consumer properties; - use of waste generated as a by-product of the process to create another product with unique properties. Successful examples of processing are given: spent iron-chromium catalyst into iron oxide pigment, water treatment waste into calcium nitrate and calcium carbonate, spent aluminum-nickel catalyst into aluminum-nickel catalyst. The resulting solid products have nanosized particles, which ensured their quality indicators.
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Jin, Q., D. Mei, Y. Cai, S. Liu, and Z. Fang. "Plasma-catalytic ammonia synthesis in dielectric barrier discharge with catalysts supported on alumina microspheres." In 2024 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10626839.

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Jayasuriya, Jeevan, Arturo Manrique, Reza Fakhrai, Jan Fredriksson, and Torsten Fransson. "Experimental Investigations of Catalytic Combustion for High-Pressure Gas Turbine Applications." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90986.

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Catalytic combustion has proven to be a suitable alternative to conventional flame combustion in gas turbines for achieving Ultra-Low Emission levels (ULE). In the process of catalytic combustion, it is possible to achieve a stable combustion of lean fuel/air mixtures which results in reduced combustion temperature in the combustor. The ultimate result is that almost no thermal-NOx is formed and the emissions of carbon monoxide and hydrocarbon emissions are reduced to single-digit limits. Successful development of catalytic combustion technology would lead to reducing pollutant emissions in gas turbines to ultra-low levels at lower operating costs. Since the catalytic combustion prevents the pollutant formations in the combustion there is no need for costly emission cleaning systems. High-quality experimental data of combustion catalyst operations at gas turbine working conditions and validated numerical models are essential tools for the design and development of catalytic gas turbine combustors. The prime objective of the work presented in this paper was to obtain catalytic operational data under said conditions. Experimental investigations were carried out to determine the operational data on different types of combustion catalysts against different fuel types at gas turbine operational conditions. A pilot-scale 100 k W high-pressure combustion test facility was used for the experimental investigations of catalytic combustion under real gas turbine conditions. Combustor pressure can be maintained at any desired level between 1 to 35 bars. The maximum combustion air supply is 100 g/s, which can be electrically preheated up to 600°C and humidified up to 30% of weight as required by test conditions. Catalysts used in the test facility are highly active noble metal catalysts for ignition purposes and thermally stable metal oxide catalysts for continuing reactions. Tests are conducted as the testing of single catalyst segments or combinations of several segments. The measurements taken are flow rates (air/fuel ratio) temperatures (inlet, surface and the outlet of each catalyst segment), pressure (combustor) and emissions of NOx, CO and UHC. This paper presents the design of the high-pressure catalytic combustion test facility and an experimental comparison of methane combustion over Pd on alumina and Pd/Pt (bi-metal) on alumina catalysts at varying pressure levels up to 20 bars. The catalysts concerned were cylindrical shaped (35 mm in diameter and 20 mm in height) honeycomb type fully coated catalysts. The results showed that the Pt/Pd on alumina catalysts is better in low temperature ignition and combustion stability over the Pd on alumina catalysts. Emission measurements showed that the fuel conversion over the tested Pt/Pd on alumina catalyst was around 10% while fuel conversion over a similar Pd on alumina catalyst (geometry and capacity) was only 4%. Fuel conversion rates showed the tendency to be further reduced (over the same catalysts) against increasing pressure.
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Ates¸, Funda. "Fast Pyrolysis of Biomass With Activated Alumina." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54689.

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In this study, corncob was chosen as a biomass sample and the pyrolysis of this sample was carried out with or without catalyst at different conditions in a well-swept fixed-bed reactor. In the experimental studies, firstly the raw material was analysed for its moisture, ash, volatile matter and fixed carbon. Then, experiments were conducted with a heating rate of 700 °C/min, mean particle size and between 300–800 °C pyrolysis temperatures with or without catalyst. The catalytic experiments involved a dry mixing of the catalyst with the biomass using an in bed-mode in the nitrogen atmosphere. In the experimental studies, influence of catalyst and temperature on the corncob products was investigated. According to the experimental results; maximum bio-oil yield was obtained as 36.1% and 34.8% with or without catalyst at a pyrolysis temperature of 500°C, respectively. The use of catalyst showed its cracking effect at higher temperatures and the gas yield increased above pyrolysis temperature of 500 °C. Pyrolysis oils were examined by using elemental analysis and GC/MS. According to all results; the use of catalyst can be suggested in the pyrolysis to obtain both good quality fuels and valuable chemicals.
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Liang, Litong, Ju Shangguan, Fang Shen, and Meisheng Liang. "Investigation on COS Hydrolysis over TiO2 Alumina Catalyst." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.486.

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Voitov, I. A., O. V. Lastovetskaya, and V. A. Borisov. "Rational methods for processing of chromia-alumina catalyst." In NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122037.

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Kawasaki, Toru, Motohiro Aizawa, Hidehiro Iizuka, Koji Yamada, and Mitsuo Kugimoto. "Investigations and Countermeasures for Deactivation of the Hydrogen Recombination Catalyst at Hamaoka Unit 4 and 5." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29155.

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At Hamaoka Unit 4 and 5, the hydrogen concentration in the outlet of off-gas recombiner had increased, and the reactors could not continue start-up operation. Therefore, we investigated the causes of the deactivating the recombination reaction and selected appropriate countermeasures to the plants. From our investigation, two types of deactivation mechanism are found. One of the causes was decreasing the active surface area of alumina as support material by the dehydrative condensation. The other cause was poisoning of the catalyst by organic silicon compound. The organic silicon was introduced from organosilicon sealant used at the junctions of the low-pressure turbine. We also found that the boehmite rich catalyst was deactivated more easily by the organic silicon than gamma alumina because boehmite had a lot of hydroxyl groups. Finally, we estimated that the deactivation of the hydrogen recombination catalysts was caused by combined two factors, which are characteristics of boehmite catalyst support and the poisoning by the organic silicon on the catalyst surface. As the countermeasures, the boehmite was changed into more stable gamma alumina by adding the heat treatment in hydrogen atmosphere at 500°C for 1 hour, and the source of organic silicon, organosilicon sealant, was removed. At Hamaoka Unit 4 and 5 improved catalysts were applied. Moreover, linseed oil that used to be used at the plants was applied again as sealant of the low-pressure turbine casing instead of the organosilicon sealant. As a result of application of these countermeasures, the reactors could be started without increase of the hydrogen concentration at these plants.
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AGNES, Ng Xin Hui. "Catalytic performance of calcium oxide-modified copper- Zinc-alumina catalysts in methanol synthesis from CO2 hydrogenation." In Decarbonization Technology: ICDT2024. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903575-21.

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Abstract. Proposed as a carbon utilization method, the catalytic hydrogenation with carbon dioxide (CO2) as feedstock to produce methanol is a viable approach for utilizing excess CO2 and countering climate change. The current work aims to enhance methanol production from CO2 hydrogenation over a CaO-promoted Cu/ZnO-based catalyst supported on Al2O3. The catalysts, prepared via impregnation method with 10 wt.% active metal loading and 1.0 wt% CaO promoter, were analyzed for physicochemical properties using N2 physical adsorption-desorption and XRD. It was found that the addition of a CaO promoter improved the textural properties of the catalyst, where a larger BET surface area (214.9 m2/g) and smaller crystallite size (7.76 nm) were obtained. The 1.0 wt% CaO-promoted catalyst showed the highest CO2 conversion (19.14%) and methanol yield (4.66%) due to its excellent textural properties and enhanced basicity.
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Rosli, Aiman Nazmi, and Norzahir Sapawe. "Performance study of Ni-alumina catalyst towards biodiesel production." In XIV INTERNATIONAL CONFERENCE ELECTROMACHINING 2023. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0195478.

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Reports on the topic "Alumina Catalyst"

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Bauza, Rodrigo, and Daniel Olsen. PR-179-20200-R01 Improved Catalyst Regeneration Process to Increase Poison Removal. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012106.

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In this work, the details of catalyst poison deposition are studied, and new catalyst restoration methods are explored. Lubrication oil makes its way through the combustion chamber and into the exhaust system, depositing poisons onto the catalyst and degrading catalyst performance. To estimate the degradation rate of the units and to find the best restoration method, two identical alumina-platinum oxidation catalysts were used in a dual setting, combining a field degradation engine and a laboratory testing engine. In order to find the best restoration process, the combination of both baking and washing is tested with poison deposition and performance analysis, and a hydrogen reduction is tested for the restoration of the platinum crystallites. The units were aged, then restored with the industry-standard washing procedure, then aged again until reaching non-compliance with emissions standards, and then restored a second time with a modified version of the industry-standard washing process that combines baking and washing. There is a related webinar.
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Olsen. PR-179-10203-R01 Characterization of Oxidation Catalyst Performance - VOCs and Temperature Variation. Pipeline Research Council International, Inc. (PRCI), 2012. http://dx.doi.org/10.55274/r0010753.

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Oxidation catalysts are typically specified to reduce carbon monoxide (CO), Hazardous Air Pollutants (HAPs) and/or Volatile Organic Compounds (VOCs) from lean-burn engines. The application of catalysts to HAPs and VOC destruction is more recent, so greater effort has been placed on optimizing for CO oxidation than HAPs or VOC oxidation. In general, the catalysts consist of a porous, high surface area -alumina carrier material on a ceramic (typically cordierite) or stainless steel substrate. Although the alumina has some effectiveness in oxidation at high temperature, its primary role here is to provide a high surface area support for a well dispersed layer of platinum (Pt) and/or palladium (Pd) which provides numerous catalytic sites for oxidation activity. This work extends the current knowledge-base for application of oxidation catalysts in three areas: (1) species specific removal efficiencies, (2) temperature dependence, and (3) space velocity.
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Rossin, Joseph A., Michele M. Farris, and David E. Tevault. Determination of a Kinetic Rate Expression for the Oxidation of Chloroform Over a 2% Platinum/Alpha-Alumina Catalyst. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada251639.

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Allenger, V. M., J. R. Brown, D. D. McLean, and M. Ternan. Deactivation of fluorinated alumina catalysts in acetylene polymerization. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/302653.

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Phisalaphong, Muenduen. Development and characterization of activated carbon derived from bacterial cellulose. Chulalongkorn University, 2017. https://doi.org/10.58837/chula.res.2017.66.

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Bacterial cellulose (BC) was investigated as a novel material for preparing activated carbons. BC was dried by heating and it was carbonized with a chemical activation process using phosphoric acid (H₃PO₄) as an activating agent at different temperatures (400, 500 and 600 °C). The properties of the activated carbons were characterized such as chemical property, structure, pore size, thermal property by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N₂ -physisorption (BET), scanning electron microscopy (SEM) , thermal gravimetric (TGA). The obtained BC activated carbons at carbonization temperature of 500 °C (BC-AC500) showed maximum BET surface area (1,734 m2/g) with mesoporous structure (2.33 nm) and large pore volume (1.01 cm3/g). The adsorption capacity was evaluated by using as adsorbent for the adsorption of methylene blue (MB). The equilibrium adsorption data were analyzed by the Langmuir, Freundlich, and Redlich-Peterson isotherm models. The results showed that the Redlich-Peterson model was found to be most fitted to the equilibrium data with correlation coefficient (R²) value of 1.000. The maximum adsorption capacity (qm) was 505.8 mg/g. The experimental results indicated that the BC activated carbon has the potential to be used as an effective adsorbent. Besides, BC and BC activated carbon has been further developed as catalyst supports. A novel catalyst of Al/BC was developed by soaking purified BC hydrogel in aluminum nitrate aqueous solution, dehydration and calcination. The Al/BC catalyst has many promising properties as catalyst in ethanol dehydration, such as good metal dispersion, high chemical and thermal stabilities. The high yield of diethyl ether at ~ 42 % can be produced from ethanol at 200 °C with the selectivity of almost 100% by using Al/BC as catalyst in ethanol dehydration. In addition, BC activated carbon is continuously developed and applied as acid catalyst in the ethanol dehydration reaction at the temperature from 200-400 °C.
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Spassova, Ivanka, Nataliya Stoeva, Petya Georgieva, Mariana Khristova, and Dimitar Mehandjiev. Copper Catalysts Supported on Alumina-Carbon Composites in NO Reduction with CO. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2020. http://dx.doi.org/10.7546/crabs.2020.08.04.

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Phisalaphong, Muenduen. Development and characterization of activated carbon derived from bacterial cellulose (Year 2). Faculty of Engineering, Chulalongkorn University, 2018. https://doi.org/10.58837/chula.res.2018.82.

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Bacterial cellulose (BC) was investigated as a novel material for preparing activated carbons. BC was dried by heating and it was carbonized with a chemical activation process using phosphoric acid (H₃PO₄) as an activating agent at different temperatures (400, 500 and 600 °C). The properties of the activated carbons were characterized such as chemical property, structure, pore size, thermal property by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N₂ -physisorption (BET), scanning electron microscopy (SEM) , thermal gravimetric (TGA). The obtained BC activated carbons at carbonization temperature of 500 °C (BC-AC500) showed maximum BET surface area (1,734 m²/g) with mesoporous structure (2.33 nm) and large pore volume (1.01 cm³/g). The adsorption capacity was evaluated by using as adsorbent for the adsorption of methylene blue (MB). The equilibrium adsorption data were analyzed by the Langmuir, Freundlich, and Redlich-Peterson isotherm models. The results showed that the Redlich-Peterson model was found to be most fitted to the equilibrium data with correlation coefficient (R2) value of 1.000. The maximum adsorption capacity (qm) was 505.8 mg/g. The experimental results indicated that the BC activated carbon has the potential to be used as an effective adsorbent. A novel catalyst of Al/BC was developed by soaking purified BC hydrogel in aluminum nitrate aqueous solution, dehydration and calcination. The high yield of diethyl ether at ~ 42 % can be produced from ethanol at 200 °C with the selectivity of almost 100% by using Al/BC as catalyst in ethanol dehydration. On the other hand, BC activated carbon, BC-AC500 is modified with various loading of H₃PO₄ and applied as acid catalyst in the ethanol dehydration reaction at the temperature from 200-400 °C. An increase in the H₃PO₄ loading from 5% to 40% increased the number of weak acid sites on the catalyst surface, which consequently enhanced ethanol conversion. At a reaction temperature of 400 °C, the modified BC-AC500 with 30-40% H₃PO₄ loading (P/BC-AC) gave ethanol conversion at 100%, with ethylene selectivity of 100%, whereas high selectivity for DEE at 66%-68%, at ethanol conversion of 49%-51% was obtained at 200 °C. Stability tests with a time-on-stream of 12 h, at reaction temperatures of 200 and 400 °C showed that the P/BC-AC catalyst had high thermal stability and stable catalytic activity. Therefore, P/BC-AC was found to be very effective as an inexpensive and environmentally friendly catalyst for ethylene production from ethanol dehydration.
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Wang, Andrew W. SCALEUP OF ALUMINUM PHOSPHATE CATALYST FOR PILOT PLANT LPDMEtm RUN. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/794179.

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Wang, Andrew W. SCALEUP OF ALUMINUM PHOSPHATE CATALYST FOR PILOT PLANT LPDMEtm RUN. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/801223.

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Brown, J. R. A semi-quantitative XPS study of model Co/Mo-alumina hydrotreating refinery catalysts. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/302651.

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