Characterization of Cu/CeO2/Al2O3 catalysts by temperature programmed reduction and activity for CO oxidation

Authors :: Ione Maluf Baibich
Renato Cataluña
Arturo Martínez-Arias
C. A. Picinini
J. Soria
R. M. Dallago
Source :: Química Nova, Vol 24, Iss 1, Pp 55-59 (2001), Repositório Institucional da UFRGS, Universidade Federal do Rio Grande do Sul (UFRGS), instacron:UFRGS, Química Nova v.24 n.1 2001, Química Nova, Sociedade Brasileira de Química (SBQ), instacron:SBQ, Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :: 2001
Publisher :: Sociedade Brasileira de Química, 2001.
Abstract: The kinetic parameters for the CO oxidation reaction using copper/alumina-modified ceria as catalysts were determined. The catalysts with different concentrations of the metals were prepared using impregnation methods. In addition, the reduction-oxidation behaviour of the catalysts were investigated by temperature-programmed reduction. The activity results show that the mechanism for CO oxidation is bifunctional : oxygen is activated on the anionic vacancies of ceria surface, while carbon monoxide is adsorbed preferentially on the higher oxidation copper site. Therefore, the reaction occurs on the interfacial active centers. Temperatures-programmed Reduction patterns show a higher disperdion when cerium oxide is present.<br />Os autores agradecem a FAPERGS e CNPq.

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