Activity and structure-sensitivity of the water-gas shift reaction over Cu{single bond}Zn{single bond}Al mixed oxide catalysts

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The activity and structure-sensitivity of the water-gas shift (WGS) reaction over Cu{single bond}Zn{single bond}Al mixed oxide catalysts were studied. Three sets of samples with different Cu/Zn and (Cu+Zn)/Al atomic ratios were prepared by coprecipitation. Depending on the cation ratio, the ternary...

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Detalles Bibliográficos
Autor principal: Ginés, M.J.L
Otros Autores: Amadeo, Nora Elvira, Laborde, M., Apesteguía, C.R
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 1995
Acceso en línea:Registro en Scopus
DOI
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Registro en la Biblioteca Digital
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Ginés, M.J.L. 
245 1 0 |a Activity and structure-sensitivity of the water-gas shift reaction over Cu{single bond}Zn{single bond}Al mixed oxide catalysts 
260 |c 1995 
270 1 0 |m Ginés, M.J.L.; Instituto de Investigaciones en Catálisis y Petroquímica (INCAPE), UNL-CONICET Santiago del Estero 2654, 3000 Santa Fe, Argentina 
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504 |a Gherardi, Ruggeri, Trifirò, Vaccari, Del Piero, Manara, Notari, Preparation of Cu-Zn-Al Mixed Hydroxycarbonates Precursors of Catalysts for the Synthesis of Methanol at Low Pressure (1983) Stud. Surf. Sci. Catal., 16, p. 723 
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506 |2 openaire  |e Política editorial 
520 3 |a The activity and structure-sensitivity of the water-gas shift (WGS) reaction over Cu{single bond}Zn{single bond}Al mixed oxide catalysts were studied. Three sets of samples with different Cu/Zn and (Cu+Zn)/Al atomic ratios were prepared by coprecipitation. Depending on the cation ratio, the ternary hydroxycarbonate precursors contained hydrotalcite, aurichalcite and/or rosasite phases. The decomposed precursors contained CuO, ZnO, ZnAl2O4, and Al2O3. The relative proportion of these phases depended on both the chemical composition of the sample and the calcination temperature employed for decomposing the precursor. After activation with hydrogen, samples were tested for the WGS reaction at 503 K. The turnover frequency of the eighteen samples tested was essentially the same (0.2-0.3 s-1) irrespective of changing the copper metal surface area between 3 and 35 m2/g Cu and the metallic copper dispersion between 0.5 and 5.0%. This indicated that the WGS reaction is a structure-insensitive reaction, as the specific reaction rate r0 (mol CO/h/g Cu) is always proportional to the copper metal surface area. Preparation of mixed oxides with a high copper dispersion is therefore required for obtaining more active catalysts. It was found that the value of the metallic copper dispersion is related to the amount of hydrotalcite contained in the hydroxycarbonate precursor: the higher the hydrotalcite content in the precursor, the higher the copper metal dispersion in the resulting catalyst and, as a consequence, the higher the catalyst activity. Ternary Cu/ZnO/Al2O3 catalysts exhibited a substantially faster WGS activity than binary Cu/ZnO catalysts. The addition of aluminium, although inactive for the WGS reaction, is required for improving the catalyst performance. © 1995 Elsevier Science B.V. All rights reserved.  |l eng 
536 |a Detalles de la financiación: Department of Chemical Engineering, Monash University 
536 |a Detalles de la financiación: Universidad de Buenos Aires 
536 |a Detalles de la financiación: P1NMATE 
536 |a Detalles de la financiación: lnstituto de Investigaciones en Cat61isis y Petroqu[mica (INCAPE), UNL-CONICET Santiago del Estero 2654, 3000 Santa Fe, Argentina b P1NMATE, Chemical Engineering Department, Universidad de Buenos Aires Ciudad Universitaria, 1428 Buenos Aires, Argentina 
593 |a Instituto de Investigaciones en Catálisis y Petroquímica (INCAPE), UNL-CONICET Santiago del Estero 2654, 3000 Santa Fe, Argentina 
593 |a PINMATE, Chemical Engineering Department, Universidad de Buenos Aires Ciudad Universitaria, 1428 Buenos Aires, Argentina 
690 1 0 |a COPPER OXIDE/ZINC OXIDE/ALUMINA 
690 1 0 |a STRUCTURE-SENSITIVITY 
690 1 0 |a WATER-GAS SHIFT REACTION 
700 1 |a Amadeo, Nora Elvira 
700 1 |a Laborde, M. 
700 1 |a Apesteguía, C.R. 
773 0 |d 1995  |g v. 131  |h pp. 283-296  |k n. 2  |p Appl. Catal. A Gen.  |x 0926860X  |w (AR-BaUEN)CENRE-3756  |t Applied Catalysis A, General 
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