Activity controlling factors for low-temperature oxidation of CO over supported Pd catalysts
Authors: Atsushi Satsuma, Kaoru Osaki, Masatoshi Yanagihara, Junya Ohyama, Kenichi Shimizu
Abstract:
The effect of supports (CeO2, TiO2, Al2O3, ZrO2, and SiO2) on CO oxidation over Pd catalysts atlow temperatures was investigated, and activity-controlling factors were discussed. The light-off temperature was in the order of Pd/CeO2 < Pd/TiO2 < Pd/Al2O3 < Pd/ZrO2 ≤ Pd/SiO2 which was fairly in agreement with the reduction temperature of supported Pd to metallic species in CO-Temperature programmed reduction (CO-TPR) profile. The result indicates that higher reducibility of supported Pd to metallic species is one of the activity-controlling factors for the oxidation activity. The activation of oxygen on metal oxide supportis suggested to be another factor for the low temperature oxidation. Actually, in situ IR measurement revealed that the oxidation of CO proceeds on Pd/CeO2 and Pd/TiO2 even under nearly 100% coverage of CO over Pd, though Pd/Al2O3 showed CO oxidation activity below 50% coverage of CO. The supports having oxygen storage property, CeO2 and TiO2, contribute to the oxygen activation to proceed CO oxidation irrespective of self-poisoning of metallic Pd surface by adsorbed CO. It was concluded that both of the following two factors are essential for CO oxidation at low temperature: (1) formation of metallic Pd and (2) oxygen storage property of metal oxide support.
Keywords:
Pd
Support effect
CO oxidation
Oxygen storage capacity
Activity-controlling factor
Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)
Publisher: Elsevier
ISSN Information: 0926-3373
Activity controlling factors for low-temperature oxidation of CO over supported Pd catalysts
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