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Dissertations / Theses on the topic 'The heterogeneous catalyst'

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Published: 18 May 2024

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1

Guo, Chris. "Alkane Oxidation Catalysis by Homogeneous and Heterogeneous Catalyst." Thesis, The University of Sydney, 2005. http://hdl.handle.net/2123/622.

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Abstract Cobalt-based complexes are widely used in industry and organic synthesis as catalysts for the oxidation of hydrocarbons. The Co/Mn/Br (known as "CAB system") catalyst system is effective for the oxidation of toluene. The Co/Mn/Br/Zr catalyst system is powerful for the oxidation of p-xylene, but not for the oxidation of toluene. [Co3O(OAc)5(OH)(py)3][PF6] (Co 3+ trimer 5) is more effective than [Co3O(OAc)6(py)3][PF6] (Co 3+ trimer 6) as a catalyst in the CAB catalyst system. Higher temperatures favour the oxidation of toluene. Zr 4+ does not enhance the oxidation of toluene. Zr

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Guo, Chris. "Alkane Oxidation Catalysis by Homogeneous and Heterogeneous Catalyst." University of Sydney. Chemistry, 2005. http://hdl.handle.net/2123/622.

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Abstract Cobalt-based complexes are widely used in industry and organic synthesis as catalysts for the oxidation of hydrocarbons. The Co/Mn/Br (known as "CAB system") catalyst system is effective for the oxidation of toluene. The Co/Mn/Br/Zr catalyst system is powerful for the oxidation of p-xylene, but not for the oxidation of toluene. [Co3O(OAc)5(OH)(py)3][PF6] (Co 3+ trimer 5) is more effective than [Co3O(OAc)6(py)3][PF6] (Co 3+ trimer 6) as a catalyst in the CAB catalyst system. Higher temperatures favour the oxidation of toluene. Zr 4+ does not enhance the oxidation of toluene. Zr

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3

El, Solh Tarek. "Heterogeneous catalyst for methane reforming." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0007/MQ30748.pdf.

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4

Khurshid, Samir Najem Aldeen. "Biodiesel production by using heterogeneous catalyst." Thesis, KTH, Skolan för kemivetenskap (CHE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145953.

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5

Weller, Suzanne Catherine. "Electron microscopy of heterogeneous catalyst particles." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396431.

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6

Elhage, Ayda. "Palladium-based Catalyst for Heterogeneous Photocatalysis." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39388.

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Over the past decade, heterogeneous photocatalysis have gained lots of interest and attention among the organic chemistry community due to its applicability as an alternative to its homogeneous counterpart. Heterogeneous catalysis offers the advantages of easy separation and reusability of the catalyst. Several studies showed that under optimized conditions, efficient and highly selective catalytic systems could be developed using supported metal/metal oxide nanoparticles. In this dissertation, we summarize the progress in the development of supported palladium nanoparticles for different type

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7

Ishtchenko, Vera. "Novel heterogeneous oxidation catalyst for organic compounds." Thesis, De Montfort University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422594.

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Ahmad, Mushtaq. "Characterization of promoted supported platinum catalyst." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/13273.

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9

Meyer, Simon [Verfasser]. "Carbide Materials as Catalysts and Catalyst Supports for Applications in Water Electrolysis and in Heterogeneous Catalysis / Simon Meyer." München : Verlag Dr. Hut, 2014. http://d-nb.info/1058284967/34.

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10

Tangale, N. P. "Zeolite based micro-mesoporous composites: synthesis, characterization and catalytic performance as heterogeneous catalyst for valorization of sugar." Thesis(Ph.D.), CSIR- National Chemical Laboratory, Pune, 2018. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4576.

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11

Richardson, John Michael. "Distinguishing between surface and solution catalysis for palladium catalyzed C-C coupling reactions: use of selective poisons." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22704.

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This work focuses on understanding the heterogeneous/homogeneous nature of the catalytic species for a variety of immobilized metal precatalysts used for C-C coupling reactions. These precatalysts include: (i) tethered organometallic palladium pincer complexes, (ii) an encapsulated small molecule palladium complex in a polymer matrix, (iii) mercapto-modified mesoporous silica metalated with palladium acetate, and (iv) amino-functionalized mesoporous silicas metalated with Ni(II). As part of this investigation, the use of metal scavengers as selective poisons of homogeneous catalysis is intr

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12

Galarraga, Carmen E. "Heterogeneous catalyst for the synthesis of middle distillate hydrocarbons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0035/MQ30763.pdf.

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13

Baines, Nicholas John. "Synthesis of heterogeneous palladium catalyst assemblies by molecular imprinting." Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249774.

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Heterogeneous palladium catalysts for use in Suzuki-type reactions have been prepared using the molecular imprinting technique. Using this technique allows the preparation of a heterogeneous catalyst with uniform active sites which have a metal complex configuration that favours processes in the catalytic cycle, thus enhancing the rate of reaction. It was reasoned, from the general catalytic cycle for palladium cross-couplings, that a bisphosphine complex with a cis ligand geometry would be beneficial. Polymerisable phosphines were synthesised and the cis bisphosphine palladium complexes prepa

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14

Deepa, A. K. "Depolymerization of lignin over heterogeneous catalyst having acidic functionality." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2014. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/1979.

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15

Singh, D. "Investigation on the valorization of lignin: Base catalyzed lignin depolymerization to aromatic monomers and their further functionalization and defunctionalization using heterogeneous catalysts." Thesis(Ph.D.), CSIR NCL, 2021. https://dspace.ncl.res.in/xmlui/handle/20.500.12252/5946.

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The high consumption rate of fossil feedstock throughout the world is responsible for decrease in its availability. Moreover, geo-political reasons and fluctuating prices are also playing crucial role in its utilization. At the same time, demand is increasing for the renewable, environment friendly resource for generating energy. Biomass, a sustainable and renewable resource has the potential to synthesize fuels and chemicals instead from fossil feedstock. Lignocellulosic biomass is readily available throughout the world at a lower cost.<br>AcSIR

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Nguyen, Joseph Vu. "Design, synthesis, and optimization of recoverable and recyclable silica-immobilized atom transfer radical polymerization catalysts." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6860.

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Despite the growing interest in heterogeneous polymerization catalysis, the majority of the polymerization catalysts used industrially are single-use entities that are left in the polymer product. Recoverable and recyclable polymerization catalysts have not reached the industrial utility of single-use catalysts because the catalyst and product separation have not become economical. The successful development of recyclable transition metal polymerization catalysts must take a rational design approach, hence academic and industrial researchers need to further expand the fundamental science and

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17

Zheng, Run. "Towards heterogeneous catalysis and catalyst design :a density functional theory study on Fischer-Tropsch synthesis." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492328.

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Fischer-Tropsch (FT) synthesis, which converts CO and H2 to a large range of hydrocarbons, is of paramount significance in utilizing natural resources, such as natural gas and coal. In this thesis, density functional theory (DFT) calculations together with kinetic analysis are introduced to study this important process. Our work shows that this combination is a good way to investigate chemical reactions occurring on surfaces, which are important in the area of heterogeneous catalysis. First of all, we study chain growth mechanism. With consideration of both coupling barriers and reactant stabi

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18

Yiu, Humphrey Hak Ping. "The application of MCM-41 type mesoporous molecular sieves as heterogeneous acid catalysts and catalyst supports." Thesis, University of Huddersfield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285629.

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Two types of mesoporous molecular sieves, MCM-41 and MMS, were prepared, fully characterised and tested as solid acid catalysts and catalyst support materials. Three different methods for characterising the surface acidity of these solid acids were examined and compared. These methods were 1. Fourier Transform infrared (FTIR) spectroscopy of adsorbed pyridine, 2. Pulsed ammonia adsorption using a combination of thermogravimetry and differential scanning calorimetry (TG/DSC), and 3. Temperature-programmed desorption of amines. The acidity results of these molecular sieves were compared with zeo

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19

HOANG, ANH VIET DUNG. "Synthesis of biodiesel via supercritical ethanol condition with heterogeneous catalyst." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2640032.

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This Ph.D. thesis aims to gain a better understanding of non-catalytic and catalytic supercritical fluid (SCF) transesterification between ethanol and rapeseed oil to produce biodiesel mainly consisting of fatty acid ethyl esters (FAEE) for future reactor scale-up and process design. Another goal was to develop a new analytical approach employ high performance liquid chromatograph (HPLC) with the potential for in-line reaction monitoring to determine the compositions of liquid products such as FAEEs, triglyceride (TG), diglyceride (DG) and monoglyceride (MG).

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Wang, Xia. "Artificial Photosynthesis : Carbon dioxide photoreduction and catalyst heterogenization within solid materials." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET025/document.

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Dans le contexte du réchauffement climatique et de l’usage abusif de combustibles fossiles, la recherche de sources d’énergie propres et durables est l’un des défis les plus importants de notre époque. Récemment, le stockage d’énergie solaire par la réduction de CO2 a fait l’objet d’un nouvel intérêt. Bien que la réduction de CO2 en carburants liquides ou gazeux soit une question à la fois fascinante et fondamentale, sa mise en œuvre dans les dispositifs technologiques reste très difficile à cause de la grande stabilité de CO2 et du caractère endergonique de sa transformation. On outre, les ré

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21

Hamoudi, Safia. "Heterogeneous catalytic oxidation of aqueous phenol, degradation kinetics and catalyst deactivation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/NQ39357.pdf.

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22

Kruger, Dawid. "Gas phase heterogeneous catalyst performance testing in laboratory fixed-bed reactors." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31115.

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Activity, selectivity and stability are invariably among the key factors of the performance of a catalyst. In the development of catalysts these properties are often screened for a range of materials and formulations. Interpretation of these key performance indicators are prone to various confounding effects. Here, performance testing of solid, porous catalysts for gas phase reactions in tubular fixed bed reactors is considered. Transport limitations and particularly internal mass transfer limitations are often cited in this case. Many have given general discussions and guides for effective ca

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23

Lopes, Ingridy Santos. "Estudo de catalisadores Pt-In/Nb2O5 na conversão de hidrocarbonetos." Universidade Federal Fluminense, 2003. http://www.bdtd.ndc.uff.br/tde_busca/arquivo.php?codArquivo=216.

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Fundação de Amparo a Pesquisa do Estado do Rio de Janeiro<br>A desidrogenação de hidrocarbonetos é um importante processo industrial, devido à grande demanda de hidrocarbonetos insaturados para produtos e processos industriais. Hidrocarbonetos insaturados são utilizados na manufatura de vários produtos, tais como detergentes, gasolina de alta octanagem, produtos farmacêuticos e borrachas sintéticas. Na desidrogenação de hidrocarbonetos, o catalisador comercial utilizado é à base de platina suportado em alumina. A acidez intrínseca do suporte é neutralizada por um metal alcalino ou alcalino ter

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24

Mirza, Amin Ruhul. "Developments in supported aqueous-phase catalysis." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311179.

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25

Cheng, Lei. "FIRST-PRINCIPLES DENSITY FUNCTIONAL THEORY STUDIES OF REACTIVITIES OF HETEROGENEOUS CATALYSTS DETERMINED BY STRUCTURE AND SUBSTRATE." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/dissertations/99.

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In this dissertation, density functional theory (DFT) calculations were used to investigate (1)NO2 adsorption on BaO in NOx Storage Reduction (NSR) catalyst affected by the morphology of BaO and the γ-Al2O3 support, (2) energy barrier of H2 dissociative adsorption over Mg clusters affected by its electronic structure, and (3) comparison of the activities of CeO2 clusters affected by two different supports--monoclinic ZrO2 and non-spinel γ-Al2O3. Our results showed that the electronic effect caused by the non-stoichiometry of the bare BaO clusters and surfaces improves their reactivities toward

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26

Lemoine, Gaetan. "Comparison of different types of Zeolites used as Solid Acid Catalysts in the Transesterification reaction of Jatropha-type oil for Biodiesel production." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/268.

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Sustainable energy management has become a high priority for many countries. A great majority of our energy stocks comes from non-renewable fossil fuels, which are currently dwindling. Biofuels are one of the most promising solutions being researched to address this urgent problem. In particular, using transesterified Jatropha curcas L. oil appears to be a promising method of producing biofuels due to several properties of the plant, such as the high oil yield of its seeds and the fact that it does not compete with food crops. The literature mentions many attempts of using zeolites as so

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27

Kong, Pei San. "A novel hydrophobic ZRO2-SIO2 based heterogeneous acid catalyst for the esterification of glycerol with oleic acid." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0042.

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Le faible coût du glycérol sur le marché a conduit à des études approfondies sur la conversion du glycérol en dérivés à valeur ajoutée. Ce travail se concentre sur l'estérification catalytique du glycérol, avec l'acide oléique, réaction d’intérêt industriel en raison de la grande valeur commerciale des produits obtenus. Dans ce travail, un nouveau catalyseur acide hétérogène présentant une surface hydrophobe a été développé sur le support ZrO2-SiO2 car un catalyseur acide solide tolérant à l'eau est essentiel pour les réactions d'estérification en milieu biphasique produisant de l'eau. Le cata

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Shi, Fan. "NMR/MRI SIGNAL ENHANCEMENT BY REVERSIBLE EXCHANGE (SABRE) AND HETEROGENEOUS SABRE (HET-SABRE)." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/994.

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Signal Amplification by Reversible Exchange, or SABRE, is a type of PHIP (ParaHydrogen Induced Polarization) pioneered by Duckett, Green, and co-workers where an organometallic catalyst is used to co-locate parahydrogen (pH2) and a molecular substrate to be hyperpolarized. Like traditional PHIP, SABRE is of interest because it is cost-effective, potentially continuous, scalable, and rapid (achieving polarization enhancement in seconds). However unlike traditional PHIP, SABRE does not require permanent alteration of the substrate to hyperpolarize it. In addition to achieving 1H polarizations of

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Sun, Xiaojiao. "Single molecule studies of acidity in heterogeneous catalysts." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16423.

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Doctor of Philosophy<br>Department of Chemical Engineering<br>Keith L. Hohn<br>Amorphous silica-alumina is widely used as a solid acid catalyst for various reactions in oil refining and the petrochemical industry. The strength and the number of the acid sites in the material are most often believed to arise from the alumina atoms inserted into the silica lattice. The existence of the acidity distribution across the framework is a result of the local composition or the short-range interactions on the silica-alumina surface. Conventional techniques used to characterize silica-alumina provide eff

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Xu, Chunli. "Preparation and characterisation of MgO : a heterogeneous basic catalyst for liquid phase reactions." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/55646/.

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We systematically studied the preparation method of magnesium oxide as cheap heterogeneous basic catalysts, and found a very simple method to obtain MgO with high surface area and high catalytic activity. Furthermore, the structure of MgO was characterized using many techniques, such as BET, TGA, XRD and SEM. The relationship of catalytic activity and structure of MgO has been investigated in detail. At last, the obtained MgO was used in the liquid phase reactions, including Meerwein-Pondorf-Verley reaction, Michael addition, Knoevenagel condensation, transesterification of vegetable oil to bi

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Zhan, Xiaotong. "Heterogeneous catalysis in microreactors : study of the performance of various supports." Thesis, Ecole centrale de Marseille, 2018. http://www.theses.fr/2018ECDM0007/document.

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Cette étude présente la préparation et l’évaluation de l’activité d’un nouveau catalyseur monolithique en microréacteur. La réaction d’hydrogénation du p-nitrophénol par transfert d’hydrogène avec l’acide formique a été choisie comme réaction modèle pour comparer les performances du monolithe à celles d’un catalyseur commercial en lit fixe.Cette thèse comporte une partie expérimentale importante. D’un côté, un montage expérimental et des protocoles d’analyse en ligne ont été mis au point pour faire une étude quantitative précise de la réaction modèle. De l’autre côté, les conditions de prépara

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PIZZOLITTO, CRISTINA. "Development of heterogeneous catalysts for fuel and chemicals production." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2963761.

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Substitution of a fossil sources-based society to renewable one is the main challenge of 21 century. This Ph.D. work is focused on the development of heterogeneous catalysts for biomass valorisation, concerning both fuel and chemical production. Thanks to their promising properties, H2 and Levulinic acid (LA) were selected. The common denominator of this thesis is the study and the optimization of the most suitable catalyst for each process. The ideal catalyst for H2 production must be robust and resistant to coke deposition, for this reason, optimisation of nickel-ceria and nickel-zirconia ba

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Anshuman, Aashu. "Development of a microwave-assisted catalytic reactor for wastewater treatment : simulation and experiments." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/34231.

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The global population is constantly rising and with the consequent increase in demand for clean water, the planet is facing a looming freshwater shortage. At the current rate, cities around the globe could lose as much as two thirds of their freshwater supply by 2050. To tackle this, there has been a huge surge on the investigation of novel wastewater treatment technologies. Advanced oxidation processes (AOPs) have shown great promise in this regard. Recently using microwaves with AOPs has been proven to exhibit improved reaction rates and thus there is a push towards developing processes invo

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Lovon, Quintana Juan Jose. "Oxidação total de metano sobre catalisadores de paladio e estanho suportados em zirconia." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267204.

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Orientador: Gustavo Paim Valença<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-12T09:16:19Z (GMT). No. of bitstreams: 1 LovonQuintana_JuanJose_D.pdf: 3240261 bytes, checksum: ad92f4d1100edab50342a486f6808682 (MD5) Previous issue date: 2008<br>Resumo: Pd e Sn foram suportados sobre ZrO2 por impregnação incipiente usando Pd(NO3)2.XH2O e SnC4H4O6.XH2O como precursores. Os sólidos foram secados e calcinados a 800, 1100 e 1400 K e caracterizados por ICP-AES, TEM, XRD, TPR, adsorção de H2, O2 e CO e por titulação de

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Odura, William Owusu. "Towards ultra-selective hydrogenation and hydrogenolysis : A nano engineering approach to heterogeneous catalyst design." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531995.

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36

Fuss, Botti Renata. "Development of Structured Porous Heterogeneous Catalyst for Biodiesel Production by Transesterification of Vegetable Oil." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3426343.

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Many environmental problems are caused when fossil fuels are used in engines. Biodiesel is a promising option to substitute these fuels because it is renewable, biodegradable and not toxic. The most used process to prepare biodiesel is by homogeneous transesterification of vegetable oils, using NaOH or KOH, but it produces a high concentration of impurities in the product. To overcome this, the use of heterogeneous catalysts is being increasingly studied. Geopolymer (GP) is an inorganic material with a chemical composition similar to zeolite and a variable microstructure, obtained by the react

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Mgedle, Nande. "The use of bimetallic heterogeneous oxide catalysts for the Fenton reaction." Thesis, Vaal University of Technology, 2019. http://hdl.handle.net/10352/460.

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M.Tech. (Department of Chemistry, Faculty of Applied and Computer Sciences), Vaal University of Technology<br>Water contaminated with non-biodegradable organics is becoming increasing problematic as it has a hazardous effect on human health and the aquatic environment. Therefore, the removal of organic contaminants is of importance and an active heterogeneous Fenton catalyst is thus required. The literature indicates that a bimetallic oxide Fenton catalyst is more active than an iron oxide catalyst. This study focused on increasing the activity of iron-based Fenton catalysts with the addition

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Angelo, Laetitia. "Développement de catalyseurs pour la synthèse de méthanol produit par hydrogénation du dioxyde de carbone." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF051/document.

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De nombreuses mesures pour réduire les émissions anthropiques de gaz à effet de serre et plus particulièrement de CO2, existent déjà, elles restent cependant insuffisantes. C’est dans ce cadre qu’a vu le jour le projet ANR VItESSE2 visant à développer un procédé de conversion de CO2,issu de certaines industries, en méthanol par réduction à l’hydrogène produit par électrolyse de l’eau à partir d’électricité fournie par des énergies faiblement émettrices de CO2 (énergie nucléaire et les énergies renouvelables). Ce procédé permet aussi d’assurer, une fonction de gestion du système électrique en r

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Ellis, Ieuan. "Interstitial modification of palladium for partial hydrogenation reactions." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:7c8c294c-0583-4a61-98e5-4c32d76cbf89.

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Heterogeneous catalysis is a key industrial process involved in the synthesis of nearly all chemicals currently produced. The environmental impact of these processes is huge so improvements must be made to current catalysts. Should a new material provide better yields at lower energy cost the benefits to both the industry and the planet are significant. There are many ways to change the behaviour of a catalyst, the addition of dopants, the selective blocking of active sites, and changing the strength of the support interaction to name a few. One technique that has become increasingly investiga

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Lin, Andrew. "Metal-Organic Frameworks and Graphene-Based Support Materials for Heterogeneous Catalysis." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5574.

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Nanoparticles are involved in a broad range of applications, including heterogeneous catalysis. Nanoparticles tend to quickly lose their well-defined shapes and facets due to aggregation under duress such as heat. A series of highly studied materials are explored as support materials for nanoparticle supports. These supports include metal-organic frameworks (MOF), graphene oxide (GO), and a MOF-PRGO (partially reduced graphene oxide) hybrid. The inclusion of a support with the palladium increased lifespan of the catalyst by separation of nanoparticles. The choice of support material not only a

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Sum, Sze Nga. "Photo-fenton degradation of textile wastewater by a novel laponite clay based Fe nanocomposite as a heterogeneous catalyst /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?EVNG%202004%20SUM.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 125-135). Also available in electronic version. Access restricted to campus users.

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Keybl, Jaroslav. "A microreactor system for high-pressure, multiphase homogeneous and heterogeneous catalyst measurements under continuous flow." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70399.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2011.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 194-206).<br>The shift towards biomass and lower quality fossil fuel feedstocks will require new conversion approaches. Catalysis will be critical in the processing of these new feedstocks. By studying catalysis at industrially relevant conditions, it may be possible to reduce the time and cost of developing new catalyst systems. Microreactors enable the study of multiphase catalyst systems at pressure

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Abidli, Abdelnasser. "Design of novel well-defined organorhenium heterogeneous catalyst for unsaturated fatty acid derivatives self-metathesis." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26473.

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La formation des liaisons C-C est parmi les cibles les plus élevés de la science et de la technologie de la catalyse. Dans ce cadre, la réaction de métathèse catalytique a gagné une importance considérable en raison de l'efficacité du processus de transformation. Par conséquent, un grand progrès a été réalisé dans ce domaine avec le développement de plusieurs catalyseurs homogènes et hétérogènes, ainsi que les différentes approches de métathèse. Cette formule a permis une conception plus facile et plus durable de diverses stratégies de synthèse dans différents domaines, y compris la synthèse o

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Saboya, Rosana Maria Alves. "ProduÃÃo de biodiesel empregando catalisadores nanoestruturados do tipo SBA-15 modificada com lantÃnio." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7795.

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AgÃncia Nacional do PetrÃleo<br>O objetivo desta dissertaÃÃo foi estudar a aplicaÃÃo da sÃlica mesoporosa SBA-15 modificada com lantÃnio como catalisador heterogÃneo nas reaÃÃes de transesterificaÃÃo e esterificaÃÃo visando Ã produÃÃo de biodiesel. Para isso sintetizou-se o catalisador La-SBA-15 variando a razÃo molar Si/La em 25, 50 e 75. O catalisador heterogÃneo La-SBA-15 apresenta caracterÃsticas Ãcidas o qual pode ser mais tolerante a Ãgua e aos Ãcidos graxos livres presentes nos Ãleos e podem catalisar simultaneamente as reaÃÃes de transesterificaÃÃo e esterificaÃÃo. O catalisador foi ca

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Zell, Elizabeth Theresa. "Synthesis and Support Shape Effects on the Catalytic Activities of CuOx/CeO2 Nanomaterials." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1525699148756394.

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Spinozzi, Di Sante Lisa. "Heterogenization of an organic catalyst by adsorption on alginic acid gels." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14425/.

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A sustainable approach focused on the practice of green chemistry was used to develop a method which improved the performances of a catalyst system based on a natural and non-toxic substance. A benchmark Michael addition reaction was performed employing 9-amino(9-deoxy)epi quinine, adsorbed on alginic acid gels by hydrogen bonds, as catalyst. Compared to conventional heterogeneization of this organic catalyst, the present approach is more straightforward and employs as support a renewable biomaterial instead of oil-derived polymers. The optimization of the adsorption protocol was carried out t

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Upreti, Pushpa Datta. "Remediation of textile and mining influenced effluents using novel heterogeneous PAN catalyst and modified PAN mesh." Thesis, De Montfort University, 2018. http://hdl.handle.net/2086/16390.

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The effectiveness of a modified PAN catalyst and hydrogen peroxide system in the treatment of textile effluent and a modified ion exchange PAN mesh in the remediation of non-coal mine drainage was investigated. The results show a tremendous potential in the treatment of such wastewaters. The treatment process for textile effluent was optimized in batch mode of operation. The influence of pH and catalyst was more pronounced compared to that of H2O2. At optimum conditions, 99.5 % decolourization and 91.9 % loss of aromaticity and 70 % mineralization were achieved in 100 minutes. The sorption of

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Tshizanga, Ngoya. "A study of biodiesel production from waste vegetable oil using eggshell ash as a heterogeneous catalyst." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2153.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology.<br>While biodiesel has the potential to resolve the energy crisis, its production is hampered by both feedstock and catalyst availability. The aim of this current study is to investigate the production of biodiesel from waste vegetable oil (WVO) as feedstock under heterogeneous catalysis, mediated by calcined eggshell ash. WVO, characterised by 9% free fatty acid (FFA) and 0.17wt% water content, was employed as feedstock in the biodiesel production via transesterification reaction. The composition of WVO was determ

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Luo, Mingliang. "Heterogeneous catalytic oxidation of aqueous phenol using an iron-based catalyst and a magnetic titanium dioxide photocatalyst." Thesis, University of East Anglia, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445198.

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Deshpande, Nitish. "Catalytic Material Design: Design Factors Affecting Catalyst Performance for Biomass and FineChemical Applications." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu154273906480973.

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