Caracterizacão de catalisadores Cu/CeO2/Al2O3 por redução a temperatura programada e atividade para oxidação de CO
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Date
2001Author
Type
Title alternative
Characterization of Cu/CeO2/Al2O3 catalysts by temperature programmed reduction and activity for co oxidation
Subject
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 reductionoxidation 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 monoxi ...
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 reductionoxidation 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. Temperaturesprogrammed Reduction patterns show a higher disperdion when cerium oxide is present. ...
In
Química nova. São Paulo. Vol. 24, n. 1 (jan./fev. 2001), p. 55-59
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National
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