Literatura académica sobre el tema "Copper-ceria catalyst"
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Artículos de revistas sobre el tema "Copper-ceria catalyst"
Di Benedetto, Almerinda, Gianluca Landi y Luciana Lisi. "Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support". Catalysts 8, n.º 5 (15 de mayo de 2018): 209. http://dx.doi.org/10.3390/catal8050209.
Texto completoPechenkin, Alexey, Sukhe Badmaev, Vladimir Belyaev y Vladimir Sobyanin. "Production of Hydrogen-Rich Gas by Formic Acid Decomposition over CuO-CeO2/γ-Al2O3 Catalyst". Energies 12, n.º 18 (19 de septiembre de 2019): 3577. http://dx.doi.org/10.3390/en12183577.
Texto completoMAHOFA, EUBERT P., TUMMA BALA NARSAIAH y CHIDURALA SHILPA CHAKRA. "Catalytic Soot Oxidation Using Ceria, Cobalt And Copper Nanocomposites". MRS Advances 3, n.º 42-43 (2018): 2581–88. http://dx.doi.org/10.1557/adv.2018.286.
Texto completoWang, Sheng, Zhen Huang, Yajun Luo, Jinhao Wang, Yue Fang, Weimin Hua, Yinghong Yue, Hualong Xu y Wei Shen. "Direct conversion of syngas into light aromatics over Cu-promoted ZSM-5 with ceria–zirconia solid solution". Catalysis Science & Technology 10, n.º 19 (2020): 6562–72. http://dx.doi.org/10.1039/d0cy01421d.
Texto completoQuiles-Díaz, Susana, Javier Giménez-Mañogil y Avelina García-García. "Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot". RSC Advances 5, n.º 22 (2015): 17018–29. http://dx.doi.org/10.1039/c4ra15595e.
Texto completoFrontera, Patrizia, Anastasia Macario, Angela Malara, Saveria Santangelo, Claudia Triolo, Fortunato Crea y Pierluigi Antonucci. "Trimetallic Ni-Based Catalysts over Gadolinia-Doped Ceria for Green Fuel Production". Catalysts 8, n.º 10 (2 de octubre de 2018): 435. http://dx.doi.org/10.3390/catal8100435.
Texto completoBhanushali, Jayesh T., Divya Prasad, Komal N. Patil, Gurram Venkata Ramesh Babu, Itika Kainthla, Kamaraju Seetha Rama Rao, Arvind H. Jadhav y Bhari Mallanna Nagaraja. "The selectively regulated vapour phase dehydrogenation of 1,4-butanediol to γ-butyrolactone employing a copper-based ceria catalyst". New Journal of Chemistry 43, n.º 30 (2019): 11968–83. http://dx.doi.org/10.1039/c9nj03067k.
Texto completoAguila, Gonzalo, Rafael Calle, Sichem Guerrero, Patricio Baeza y Paulo Araya. "Improvement of thermal stability of highly active species on SiO2 supported copper-ceria catalysts". RSC Advances 11, n.º 53 (2021): 33271–75. http://dx.doi.org/10.1039/d1ra06204b.
Texto completoOb-eye, Jeerati, Piyasan Praserthdam y Bunjerd Jongsomjit. "Dehydrogenation of Ethanol to Acetaldehyde over Different Metals Supported on Carbon Catalysts". Catalysts 9, n.º 1 (9 de enero de 2019): 66. http://dx.doi.org/10.3390/catal9010066.
Texto completoGazu, Qinisani, Mzamo Shozi y Philani Mpungose. "Oxidation of styrene to benzaldehyde and styrene oxide over nickel and copper ceria solution combustion catalysts". MATEC Web of Conferences 374 (2023): 01004. http://dx.doi.org/10.1051/matecconf/202337401004.
Texto completoTesis sobre el tema "Copper-ceria catalyst"
Lortie, Maxime. "Reverse Water Gas Shift Reaction over Supported Cu-Ni Nanoparticle Catalysts". Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31733.
Texto completoCaldas, Paula Cristina de Paula. "Estudo das propriedades estruturais dos catalisadores de Cu e Cu-Ce suportados em alumina aplicados à reação de deslocamento gás-água". Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/4113.
Texto completoUniversidade Federal de Sao Carlos
Particle size effect and Ce addition on the catalytic properties of Cu/Al2O3catalysts were investigated for the water gas shift reaction (WGS). The catalysts were prepared by dry impregnation of an aqueous solution of nitrates of the respective metals on alumina, synthesized by sol-gel method. Samples were prepared with 5, 10 and 15% w/w of metallic copper and 12% w/w of CeO2. The catalysts were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR) spectroscopy, X-ray absorption (XAS). The WGS reaction was performed with reagents ratio of H2O:CO = 1:3 with temperature range from 200 to 350° C. The crystallites CuO were not detected by XRD. As the Cu content increased, the crystallite size of CeO2 decreased with a fluorite type structure from 7.4 to 3.4 nm. The results of TPR showed that the interaction Cu-O-Al was crucial to reduce temperature and ceria addition on the catalysts did not affect the temperature reduction of the CuO. The XANES in situ results along the WGS reaction showed that metallic Cu predominated and ceria was partially reduced. EXAFS results showed that the Cu particle size increased from 0.65 to 0.91 nm with an increased load of copper from 5 to 15%, respectively. After the reduction, step prior to reaction, the catalysts were not completely reduced. The degree of reduction increased with the Cu particle size and it was also dependent on the temperature and the oxidation potential of mixing of the reactants. The addition of ceria did not change the degree of reduction of samples Cu/Al2O3. The results suggest that the Cu particles have a reduced Cu core covered with an oxide layer. The catalytic activity increased as the Cu particle size decreased, which can be associated with the presence of the redox couple Cu+/Cu0. This provides a possibility of CO oxidation and its reoxidation due to water activation. The ceria addition also increased catalytic activity and it is probably attributed to activation of the water on the surface of ceria, followed by transfer of oxygen from its structure to the oxidation of CO in an interface Cu-CeO2.
O efeito do tamanho da partícula de Cu e a adição de céria nas propriedades catalíticas dos catalisadores de Cu/Al2O3 foram investigados para a reação de deslocamento gás água (WGS). Os catalisadores foram preparados por impregnação da solução alcoólica dos respectivos nitratos dos metais em alumina, sintetizada pelo método sol-gel. As amostras foram preparadas com teores de Cu de 5, 10 e 15% m/m e 12% m/m de CeO2. Os catalisadores foram caracterizados por difração de raios X (DRX), redução a temperatura programada (TPR) e espectroscopia de absorção de raios X (XAS). A reação de WGS foi realizada com a razão de reagentes H2O:CO = 3:1 em temperaturas entre 200 e 350ºC . Os cristalitos de CuO não foram detectados por DRX. Com o aumento do teor de Cu de 5 para 15% m/m verificou-se um decréscimo no tamanho de cristalitos de CeO2 com uma estrutura do tipo fluorita de 7,4 para 3,4 nm. A interação Cu-O-Al foi determinante na temperatura de redução dos catalisadores e a adição da céria não afetou a temperatura da redução do CuO. Os resultados de XANES in situ mostraram que ao longo da reação de WGS o Cu na forma metálica foi predominante e a céria encontrava-se parcialmente reduzida. Os resultados de EXAFS mostraram que o tamanho das partículas de Cu aumentou de 0,65 para 0,91nm com o aumento do teor do cobre de 5 para 15%, respectivamente. Após a etapa de redução que antecede a reação, os catalisadores não se encontraram completamente reduzidos. O grau de redução aumentou com o tamanho da partícula de Cu e mostrou-se dependente também da temperatura e do potencial de oxidação da mistura dos reagentes. A adição da céria não modificou o grau de redução das amostras de Cu/Al2O3. Tais resultados sugerem que as partículas de cobre apresentam um núcleo reduzido com óxido de cobre na superfície. A atividade catalítica aumentou com a diminuição do tamanho de partícula de Cu, o que pode estar associado à maior presença do par redox Cu+/Cu0 nas menores partículas. Este possivelmente proporciona a oxidação do CO, reduzindo o Cu+ ao Cu0 e a reoxidação ocorre devido à ativação da água. A adição da céria também aumentou a atividade catalítica, a qual foi atribuída provavelmente à ativação da água nas vacâncias de oxigênio da céria, seguida da transferência de oxigênio de sua estrutura para a oxidação do CO em uma interface Cu-CeO2.
Fernández, Villanueva Estefanía. "Theoretical Study of the Geometrical, Electronic and Catalytic properties of Metal Clusters and Nanoparticles". Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/135277.
Texto completo[CAT] Atès que són de grandària subnanomètrica, els clusters metàl·lics estan regits pel confinament quàntic, el qual els fa més "moleculars" i menys "metàl·lics". En conseqüència, manifesten propietats que són diferents a les de partícules més grans del mateix element, i que sovint són avantatjoses per a la catàlisi de reaccions específiques. A més a més, la seua menor grandària fa que siguen més econòmics, amb una major superfície exposada. Així, els clusters són una opció molt interesant en catàlisi, i el seu estudi, síntesi i aplicació ha cres-cut contínuament des del seu descobriment als anys 90. Aquesta tesi s'ha centrat principalment en el coure, del qual es presenta, en primer lloc, un estudi fonamental sobre la dissociació de l'oxígen per clusters de diferents grandàries. Després, s'explora computacionalment la catàlisi de les oxidacions de CO i de propè, confirmant que els clusters de Cu5 (o inferior) són prometedors per a reaccions d'oxidació. Les dues reaccions utilitzades són bons exemples de l'aplicació potencial en indústria, siga per reduir emissions de CO o per produir epòxid de propè, que és un intermedi important en la producció de plàstics i adhesius, entre altres. A més, també es va estudiar la influència de dos suports en els clusters de coure i la seua capacitat d'oxidació: N-grafè com a un sistema més inert i cèria com a un que pot participar activament en reaccions d'oxidació. Finalment, s'inclouen altres dos estudis més específics, sobre la capacitat dels clusters de Pt3 y Pd3 per catalitzar reaccions d'acoblament C-C com la reacció de Heck, important per a la síntesi de productes de la química fina, i sobre la reacció CO + NO als clusters de Pt, motivat pel seu ús potencial com a catalitzadors per a la conversió d'eixes espècies en els menys perjudicials CO2 i N2 als motors de combustió interna.
[EN] Due to their subnanometric size, metal clusters belong to the regime affected by quantum confinement, which makes them more "molecular" and less "metallic". As a result, they exhibit properties that differ with respect to those of larger particles of the same element, and which are often advantageous in the catalysis of specific reactions. Besides, their smaller size makes them more economic and with a higher surface exposed. All of this renders metal clusters very interesting options for catalysis, and their study, synthesis and application has steadily increased since their discovery in the 90s. In this work we have largely focused on copper, of which a fundamental study on the oxygen dissociation by clusters of different sizes is first presented. Then, the catalysis of the CO and propene oxidation reactions is theoretically explored, confirming that Cu5 (or smaller) clusters are promising systems for oxidation reactions. The two reactions used are good examples of the potential application in industry, either to reduce CO emissions or to produce propene epoxide, an important intermediate in the production of plastics and adhesives, among others. In addition, the influence of two supports in the copper clusters and their oxidation capability is explored: on N-graphene as a more inert system and on ceria as one that can actively participate in oxidation reactions. Finally, two other more specific studies are included, regarding the capability of Pt3 and Pd3 clusters to undergo C-C coupling reactions such as the Heck reaction, important for the synthesis of many products of fine chemistry, and regarding the CO + NO reaction on Pt clusters, motivated by their potential use as catalysts for the conversion of those species in less harmful CO2 and N2 in internal combustion engines.
En primer lugar me gustaría agradecer al Ministerio de Economía y Competitividad de España (MINECO) por la financiación de esta tesis mediante el programa Severo Ochoa (SVP-2013-068146), incluyendo los costes adicionales de mi estancia de investigación (EEBB-I-17-12057).
Fernández Villanueva, E. (2019). Theoretical Study of the Geometrical, Electronic and Catalytic properties of Metal Clusters and Nanoparticles [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/135277
TESIS
Chen, Yang-Chieh y 陳楊傑. "Ethanol Adsorption and Conversion by Copper-Ceria Catalyst System". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/99652987956121919363.
Texto completo國立臺灣科技大學
工程技術研究所
98
This research aims to study the absorption and conversion of ethanol on catalyst supported on SiO2- and CeO2- in order to understand ethanol reforming reaction. The CeO2 was loaded on the SiO2 via incipient wetness impregnation, and its properties was compared with the CeO2 prepared by homogeneous precipitation method. The catalysts were characterized and examined by N2 physisorption, X-ray powder diffraction, temperature programmed reduction, ethanol pulse chemisorption, temperature programmed desorption and ethanol pulse reaction. Higher ethanol absorption of CeO2(HSA) was achieved by loading 0.2wt% Cu. During the process of temperature programmed reduction, the incorporation of the Cu promoted the decomposition of the surface species of catalyst. The loading of Cu also enhanced the ethanol conversion as indicated in the ethanol pulse chemisorption experiments suggesting that the catalyst system is feasible to operate with lower temperature.
Wang, Chia-Ho y 王嘉河. "The Study of CO Selectivity Oxidation in Excess of Hydrogen over the Copper-Ceria Catalyst". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/37246599816175941871.
Texto completo逢甲大學
化學工程學所
93
This study is focused to optimize the selective oxidation of carbon monoxide reaction process over three types of the lab-prepared catalysts to remove CO or convert into CO2 in the presence of excess hydrogen.The proposed catalysts, Cu/Ce/γ-Al2O3 and Cu/Ce-MCM-41 were prepared by incipient wetness method, and CuO-CeO2 was made by co-precipitation. These catalysts were characterized by XRD, BET, and ICP. The activity of catalysts was tested in an environment of 1vol% CO, 2vol%O2 50vol% H2, 15vol% CO2, and 3vol%H2O. The experimental results showed that the CO conversion achieved 100% at 170 oC ~230oC when the CuO-CeO2 catalyst with Cu to Ce molar ratio is 3:7. At the same molar ratio, the CO conversion of Cu/Ce/γ-Al2O3 was higher than those by CuO-CeO2 catalysts.The CO conversion achieved 99.5% at 230°C when the Cu/Ce/γ-Al2O3 catalyst with Cu to Ce molar ratio was 6:4. According to the BET and ICP results showed that surface area of Cu/Ce-MCM-41 decrease significantly.The active centers decreased and the ceria content was insuffucuent as well.
Hu, Yi-tin y 胡義亭. "Copper/Ceria Catalysts for Water-Gas Shift Reaction". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/65573981284489545599.
Texto completo大同大學
化學工程學系(所)
92
In the methanol steam-reforming reaction, there are small quantities carbon monoxides, and the water-gas shift reaction is the method which is applies recently to converse large amount of carbon monoxide. This research is to develop, Cu-series catalyst with high performance of removing carbon monoxide at low temperature (200 ℃~280 ℃). In this research, silicon dioxide (SiO2) was used as carrier, treats as the active metal by the Cu and Ce, contains the different proportion active metal impregnated on the carrier, then they were calcined at the high temperature of 500 ℃. After being reduced, the catalysts possessed the best efficiency of removing CO. The characteristic analyses of the Cu-series catalysts were performed by TGA, TPR, TPO, XRD and ICP. The water-gas shift reaction was carried out in the fixed-bed reaction: under the circumstances of the hydrogen-rich atmosphere, a gas containing small quantity of CO for simulating the trailing gas of fuel cell passed through the reactor, and before the reaction took place, the catalysts were reduced with hydrogen; besides, comparisons of the active metals of oxidization state with the active metals of reduction state were made, so as to find out the differences in efficiencies of removing CO and the optimal proportions of catalysts. The experimental result showed that the active metal Ce increased on the Cu/SiO2 carrier promoted the metal dispersion and particle diameters of active metal copper was smaller. From the reduction peak diagrams of TPR, it could be known that the higher was the active metals content in the catalyst, the easier was on the carrier surface to from large grains of oxidized copper, and the higher was the reduction temperature, showing that when the catalysts carried out WGSR, the activities were poorer. During WGSR, added ceria in Cu-series catalyst, its catalyst activity had not added the ceria in Cu-series catalyst is better than; Using SiO2 was the support, when the Cu content reached to 25 wt%, the CO removing percentage at 250 ℃ could reach 92%; When has not added the ceria the catalyst, the Cu content reached to 25 wt%, the CO removing percentage at 250 ℃ could reach 75%.
Capítulos de libros sobre el tema "Copper-ceria catalyst"
Tabakova, T., F. Boccuzzi, M. Manzoli, A. Chiorino y D. Andreeva. "Characterization of nanosized gold, silver and copper catalysts supported on ceria". En Oxide Based Materials - New sources, novel phases, new applications, 493–500. Elsevier, 2005. http://dx.doi.org/10.1016/s0167-2991(05)80176-4.
Texto completoActas de conferencias sobre el tema "Copper-ceria catalyst"
Wang, Jung-Hui y Chuin-Tih Yeh. "Washcoating Copper Catalyst With Various Metal Oxides Sol Onto Microchannel Reactor for Steam Reforming of Methanol". En ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33305.
Texto completoMuthiya, S. Jenoris, Induja Saravanan, Gajalakshmi Balachandran y 1Lt P. S. Raghavan. "Experimental Investigation in Diesel Oxidation Catalyst by Developing a Novel Catalytic Materials for the Control of HC, CO and Smoke Emissions". En International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0458.
Texto completoTabakova, Tatyana, Ivan Ivanov, Janusz W. Sobczak, Wojciech Lisowski, Zbigniew Kaszkur, Rodolfo Zanella, Petya Petrova, Yordanka Karakirova y Lyuba Ilieva. "A Comparative Study of Nanosized Gold and Copper Catalysts on Y-doped Ceria for the Water-Gas Shift Reaction". En The 5th World Congress on New Technologies. Avestia Publishing, 2019. http://dx.doi.org/10.11159/icnfa19.140.
Texto completo