Relevant bibliographies by topics / Activated carbon supported metal oxide catalyst

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  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Activated carbon supported metal oxide catalyst'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Activated carbon supported metal oxide catalyst"

1

Thangadurai, Tavayogeshwary, and Ching Thian Tye. "Performance of Activated Carbon Supported Cobalt Oxides and Iron Oxide Catalysts in Catalytic Cracking of Waste Cooking Oil." Periodica Polytechnica Chemical Engineering 65, no. 3 (May 13, 2021): 350–60. http://dx.doi.org/10.3311/ppch.16885.

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This work studied the catalyst activity of activated carbon (AC) supported Co, Fe and Co-Fe oxides in catalytic cracking of waste cooking oil. Reactions were carried out in a fixed bed reactor at 450 °C with WHSV 9 hr–1. Single metal Co/AC and Fe/AC catalysts with different metal loading (2.5–15 wt.%) and bimetal xCo-yFe/AC (x, y = 2.5 to 12.5 wt.%; x + y =15 wt.%) catalysts were investigated. Co/AC and Fe/AC catalysts both contributed to significant liquid yield with high selectivity towards C15 and C17 hydrocarbons. Fe/AC catalysts gave high C5 – C20 hydrocarbon yield whereas Co/AC attained more palmitic (C16) and oleic (C18) acid conversion. Synergistic effect in two metals Co-Fe/AC catalysts had further improved the liquid hydrocarbon yield (up to ~93 %) and fatty acid conversion (up to 94 %). The best catalyst, 10Co-5Fe/AC had been further tested under the effect of reaction temperature, feed flow rate (WHSV) and deactivation for its catalytic performance.
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Rusanen, Annu, Riikka Kupila, Katja Lappalainen, Johanna Kärkkäinen, Tao Hu, and Ulla Lassi. "Conversion of Xylose to Furfural over Lignin-Based Activated Carbon-Supported Iron Catalysts." Catalysts 10, no. 8 (July 22, 2020): 821. http://dx.doi.org/10.3390/catal10080821.

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In this study, conversion of xylose to furfural was studied using lignin-based activated carbon-supported iron catalysts. First, three activated carbon supports were prepared from hydrolysis lignin with different activation methods. The supports were modified with different metal precursors and metal concentrations into five iron catalysts. The prepared catalysts were studied in furfural production from xylose using different reaction temperatures and times. The best results were achieved with a 4 wt% iron-containing catalyst, 5Fe-ACs, which produced a 57% furfural yield, 92% xylose conversion and 65% reaction selectivity at 170 °C in 3 h. The amount of Fe in 5Fe-ACs was only 3.6 µmol and using this amount of homogeneous FeCl3 as a catalyst, reduced the furfural yield, xylose conversion and selectivity. Good catalytic activity of 5Fe-ACs could be associated with iron oxide and hydroxyl groups on the catalyst surface. Based on the recycling experiments, the prepared catalyst needs some improvements to increase its stability but it is a feasible alternative to homogeneous FeCl3.
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Liu, Fang, Li Yang, Jie Cheng, Xin Wu, Wenbin Quan, and Kozo Saito. "Low Temperature deNOx Catalytic Activity with C2H4 as a Reductant Using Mixed Metal Fe-Mn Oxides Supported on Activated Carbon." Energies 12, no. 22 (November 14, 2019): 4341. http://dx.doi.org/10.3390/en12224341.

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The selective catalytic reduction of NOx (deNOx) at temperatures less than or at 200 °C was investigated while using C2H4 as the reductant and mixed oxides of Fe and Mn supported on activated carbon; their activity was compared to that of MnOx and FeOx separately supported on activated carbon. The bimetallic oxide compositions maintained high NO conversion of greater than 80–98% for periods that were three times greater than those of the supported monometallic oxides. To examine potential reasons for the significant increases in activity maintenance, and subsequent deactivation, the catalysts were examined by using bulk and surface sensitive analytical techniques before and after catalyst testing. No significant changes in Brunauer-Emmett-Teller (BET) surface areas or porosities were observed between freshly-prepared and tested catalysts whereas segregation of FeOx and MnOx species was readily observed in the mono-oxide catalysts after reaction testing that was not detected in the mixed oxide catalysts. Furthermore, x-ray diffraction and Raman spectroscopy data detected cubic Fe3Mn3O8 in both the freshly-prepared and reaction-tested mixed oxide catalysts that were more crystalline after testing. The presence of this compound, which is known to stabilize multivalent Fe species and to enhance oxygen transfer reactions, may be the reason for the high and relatively stable NO conversion activity, and its increased crystallinity during longer-term testing may also decrease surface availability of the active sites responsible for NO conversion. These results point to a potential of further enhancing catalyst stability and activity for low temperature deNOx that is applicable to advanced SCR processing with lower costs and less deleterious side effects to processing equipment.
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Luo, Mingsheng, Shuo Li, Zuoxing Di, He Li, Qinglong Liu, Baozhong Lü, Aimei Wang, Buchang Shi, and Iltaf Khan. "Fischer–Tropsch Synthesis: Study of Different Carbon Materials as Cobalt Catalyst Support." Reactions 2, no. 1 (March 10, 2021): 43–61. http://dx.doi.org/10.3390/reactions2010005.

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In this work, cobalt Fischer–Tropsch synthesis (FTS) catalyst supported on various carbon materials, i.e., carbon nanotube (CNT), activated carbon (AC), graphene oxide (GO), reduced graphene oxide (rGO), and carbon nanofiber (CNF), were prepared via impregnation method. Based on TGA, nitrogen physisorption, XRD, Raman spectroscopy, H2-TPR, NH3-TPD, ICP, SEM, and TEM characterization, it is confirmed that Co3O4 particles are dispersed uniformly on the supports of carbon nanotube, activated carbon and carbon nanofiber. Furthermore, the FT catalyst performance for as-prepared catalysts was evaluated in a fixed-bed reactor under the condition of H2:CO = 2:1, 5 SL·h−1·g−1, 2.5 MPa, and 210 °C. Interestingly, the defined three types of carbon materials exhibit superior performance and dispersion compared with graphene oxide and reduced graphene oxide. The thermal stability and pore structure of the five carbon materials vary markedly, and H2-TPR result shows that the metal–support interaction is in the order of Co/GO > Co/CNT > Co/AC > Co/CNF > Co/rGO. In brief, the carbon nanofiber-supported cobalt catalyst showed the best dispersion, the highest CO conversion, and the lowest gas product but the highest heavy hydrocarbons (C5+) selectivity, which can be attributed to the intrinsic property of CNF material that can affect the catalytic performance in a complicated way. This work will open up a new gateway for cobalt support catalysts on various carbon-based materials for Fischer–Tropsch Synthesis.
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Cao, Wan, and Weijun Zhang. "Low temperature selective catalytic reduction of nitric oxide with an activated carbon-supported zero-valent iron catalyst." RSC Advances 10, no. 69 (2020): 42613–18. http://dx.doi.org/10.1039/d0ra07939a.

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6

Pudi, Satyanarayana Murty, Tarak Mondal, Prakash Biswas, Shalini Biswas, and Shishir Sinha. "Conversion of Glycerol into Value-Added Products Over Cu–Ni Catalyst Supported on γ-Al2O3 and Activated Carbon." International Journal of Chemical Reactor Engineering 12, no. 1 (January 1, 2014): 151–62. http://dx.doi.org/10.1515/ijcre-2013-0102.

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Abstract A series of Cu, Ni monometallic and bimetallic catalysts supported on γ-Al2O3 and activated carbon were synthesized by incipient wetness impregnation method and examined for hydrogenolysis and esterification of glycerol. Hydrogenolysis reaction was carried out in a 250 ml Teflon-coated stainless steel batch reactor at 250°C and 10 bar H2 pressure, whereas esterification of glycerol with acetic acid was carried out at 120°C at atmospheric pressure. The physiochemical properties of the catalysts were investigated by various techniques such as surface area, X-ray diffraction (XRD), NH3-temperature-programmed desorption (TPD). Characterization results dictated that the reduction behavior, acidic nature and the metal support interactions were varied with the support as well as Cu/Ni weight ratio. The XRD results confirmed the formation of mixed oxide Cu0.75Ni0.25 Al2O4 phase in Cu–Ni (3:1)/γ-Al2O3 catalyst. Among the catalysts tested, Cu–Ni bimetallic catalysts showed superior performance as compared to monometallic catalysts in both the reactions. The glycerol hydrogenolysis activity of γ-Al2O3 supported Cu–Ni catalysts was higher than the activated carbon-supported catalysts. 1,2-PDO was obtained as the main hydrogenolysis product independent of the support as well as Cu/Ni weight ratio and its selectivity was in the range of 92.8–98.5%. The acidic nature of γ-Al2O3 and the mixed oxide (Cu0.75Ni0.25Al2O4) phase played an important role for hydrogenolysis activity. Cu–Ni (3:1)/γ-Al2O3 catalyst showed the maximum 1,2-PDO selectivity to 97% with 27% glycerol conversion after a reaction time of 5 h. On the other hand, Cu–Ni(1:3)/C catalyst showed the highest glycerol conversion of 97.4% for esterification and obtained selectivity to monoacetin, diacetin and triacetin were 26.1%, 67.2% and 6.5%, respectively.
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Chornaja, Svetlana, Elina Sproge, Konstantins Dubencovs, Lidija Kulikova, Vera Serga, Antons Cvetkovs, and Valdis Kampars. "Selective Oxidation of Glycerol to Glyceraldehyde over Novel Monometallic Platinum Catalysts." Key Engineering Materials 604 (March 2014): 138–41. http://dx.doi.org/10.4028/www.scientific.net/kem.604.138.

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Several novel monometallic platinum catalysts supported on metal oxides (Al2O3, Y2O3, γ-Al2O3, Lu2O3, ZrO2-Y2O3 TiO2, SiO2, γ-AlO(OH)) and activated carbon (C) were synthesized by extractive-pyrolytic method and tested in glycerol oxidation processes without base addition to obtain glyceraldehyde. It was found that Pt catalyst activity is strongly influenced by support nature, oxygen partial pressure and Pt loading. Pt/Al2O3 and Pt/SiO2 catalysts exhibited the highest activity but selectivity to glyceraldehyde significantly decreased when glycerol conversion increased.
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Gamal, Ahmed, Kamel Eid, Muftah H. El-Naas, Dharmesh Kumar, and Anand Kumar. "Catalytic Methane Decomposition to Carbon Nanostructures and COx-Free Hydrogen: A Mini-Review." Nanomaterials 11, no. 5 (May 6, 2021): 1226. http://dx.doi.org/10.3390/nano11051226.

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Catalytic methane decomposition (CMD) is a highly promising approach for the rational production of relatively COx-free hydrogen and carbon nanostructures, which are both important in multidisciplinary catalytic applications, electronics, fuel cells, etc. Research on CMD has been expanding in recent years with more than 2000 studies in the last five years alone. It is therefore a daunting task to provide a timely update on recent advances in the CMD process, related catalysis, kinetics, and reaction products. This mini-review emphasizes recent studies on the CMD process investigating self-standing/supported metal-based catalysts (e.g., Fe, Ni, Co, and Cu), metal oxide supports (e.g., SiO2, Al2O3, and TiO2), and carbon-based catalysts (e.g., carbon blacks, carbon nanotubes, and activated carbons) alongside their parameters supported with various examples, schematics, and comparison tables. In addition, the review examines the effect of a catalyst’s shape and composition on CMD activity, stability, and products. It also attempts to bridge the gap between research and practical utilization of the CMD process and its future prospects.
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9

Ferreiro, Cristian, Natalia Villota, José Ignacio Lombraña, María J. Rivero, Verónica Zúñiga, and José Miguel Rituerto. "Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor." Materials 14, no. 18 (September 10, 2021): 5207. http://dx.doi.org/10.3390/ma14185207.

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This work presents an efficient method for treating industrial wastewater containing aniline and benzothiazole, which are refractory to conventional treatments. A combination of heterogeneous photocatalysis operating in a fluidised bed reactor is studied in order to increase mass transfer and reduce reaction times. This process uses a manganese dioxide catalyst supported on granular activated carbon with environmentally friendly characteristics. The manganese dioxide composite is prepared by hydrothermal synthesis on carbon Hydrodarco® 3000 with different active phase ratios. The support, the metal oxide, and the composite are characterised by performing Brunauer, Emmett, and Teller analysis, transmission electron microscopy, X-ray diffraction analysis, X-ray fluorescence analysis, UV–Vis spectroscopy by diffuse reflectance, and Fourier transform infrared spectroscopy in order to evaluate the influence of the metal oxide on the activated carbon. A composite of MnO2/GAC (3.78% in phase α-MnO2) is obtained, with a 9.4% increase in the specific surface of the initial GAC and a 12.79 nm crystal size. The effect of pH and catalyst load is studied. At a pH of 9.0 and a dose of 0.9 g L−1, a high degradation of aniline and benzothiazole is obtained, with an 81.63% TOC mineralisation in 64.8 min.
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Kupila, Riikka, Katja Lappalainen, Tao Hu, Henrik Romar, and Ulla Lassi. "Lignin-based activated carbon-supported metal oxide catalysts in lactic acid production from glucose." Applied Catalysis A: General 612 (February 2021): 118011. http://dx.doi.org/10.1016/j.apcata.2021.118011.

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Dissertations / Theses on the topic "Activated carbon supported metal oxide catalyst"

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Xu, Chunbao. "Continuous and batch hydrothermal synthesis of metal oxide nanoparticles and metal oxide-activated carbon nanocomposites." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07302006-231517/.

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Thesis (Ph. D.)--Chemical and Biomolecular Engineering, Georgia Institute of Technology, 2007.
Teja, Amyn, Committee Chair ; Kohl, Paul, Committee Member ; Liu, Meilin, Committee Member ; Nair,Sankar, Committee Member ; Rousseau, Ronald, Committee Member.
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2

Su, Chiung-Hui, and 蘇琼惠. "Catalytic Oxation of Pharmaceutical Wastewater by Activated Carbon Supported Metal Catalyst." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/gnuz6z.

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碩士
嘉南藥理科技大學
環境工程與科學系曁研究所
97
The purpose of this investigation is to prepare the porous activated carbon catalysts for pharmaceutical wastewater treatment with discarded coconut shells by using the copper chloride or iron sulfate as the chemical activation agent. The raw pharmaceutical wastewater is characterized by high values of COD (470-710 g/L), pH (1.37-1.77), BOD5 (414-620 g/L). The oxidation reaction was performed after the pharmaceutical wastewater was diluted by 200 times. The BET, SEM-EDS analyses were used to identify the pore properties and morphology characteristics of iron or copper supported activated carbon catalysts, and the oxidative activities of Fe or Cu supported activated carbon catalysts (Fe-AC or Cu-AC) were monitored by determination of COD and BOD5 during the oxidation period. Based on the analysis of N2 adsorption isotherm, it was indicated the Hysteresis loop of Fe- or Cu-ACs were typical TYPE IV. However, the Hysteresis loop of Fe- or Cu-ACs were H4 and H3 based on the analysis of N2 desorption isotherm, respectively. The influent factors on the COD removal of pharmaceutical wastewater in oxidation were considered by wastewater pH, dosage of H2O2 and reaction temperature. The active metal ions on catalysts strongly affect the pore properties and surface area of activated carbon. Superior performance of the Fe-AC catalyst activated by iron sulfate can be obtained with pharmaceutical wastewater at COD concentration of 3,000 mg/L, while the lower COD abatement efficiency was found in Cu-AC catalytic oxidation process. The efficiency of oxidation was mainly limited by the initial pH values of pharmaceutical wastewater, the oxidant concentration and reaction temperature. Increase of the oxidant dosage and the optimal pH and higher reaction temperature could increase the COD removal efficiency of pharmaceutical wastewater. Higher removal of COD was observed with the reaction condition of Fe-AC catalyst (1g/L), 0.1 M H2O2 (10.3 mL/L), pH7 and 80℃. The experimental results also showed that the addition step of hydrogen peroxide strongly dominated the efficiency of COD removal in oxidation. It is suggested that the higher removal of pollutant can be obtained with the multiple-step addition of hydrogen peroxide in the oxidation process. It was concluded that metal type on the catalyst surface, the oxidant concentration, initial pH of pharmaceutical wastewater and reaction temperature played the important roles in the oxidation system.
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Conference papers on the topic "Activated carbon supported metal oxide catalyst"

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Feng, Bo, Cheng-Yang Wang, and Bin Zhu. "Novel AC-M-SCC Anode Materials for Solid Oxide Fuel Cells Using Methanol at Intermediate or Low Temperature." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74140.

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In this paper, novel anode materials for solid oxide fuel cells which can directly operate liquid fuels at intermediate or low temperature were investigated. These materials were based on the activated carbons supported transition metal catalysts (AC-M) and the solid carbonate-ceria composite (SCC) materials, which were prepared via the sol-gel route. The SCCs possess both oxide-ion and proton conductivity, being used as multi-ion conductors. Activated carbons supported transition metals were used to improve the characters of anode materials and especially to enhance the anode catalyst function to liquid fuels, e.g., methanol. The internal reforming of liquid fuels was proved. There is no external reforming system needed. We used also the chemical methods to improve the commercial activated carbons. The microstructure, conductivity and electrochemical properties of anode materials were investigated as functions of the activated carbon pre-treating condition. Using these novel materials, the power intensity of 0.2 W/cm2 was achieved for fuel cells directly operating the methanol at 600 °C.
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