Gold catalysts supported on ceria and ceria–alumina for water-gas shift reaction

Gold-supported catalysts on ceria and ceria–alumina with different ratios in the water-gas shift reaction were studied. It was shown that the addition of alumina leads to the deeper oxygen vacancies formation, detected by Raman and TPR measurements. It was established an increase of the ceria disper...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2006-03, Vol.302 (1), p.127-132
Main Authors: Andreeva, D., Ivanov, I., Ilieva, L., Abrashev, M.V.
Format: Article
Language:English
Subjects:
Catalysis
Ceria–alumina
Chemistry
Exact sciences and technology
General and physical chemistry
Gold
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TPR
WGS
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Summary:Gold-supported catalysts on ceria and ceria–alumina with different ratios in the water-gas shift reaction were studied. It was shown that the addition of alumina leads to the deeper oxygen vacancies formation, detected by Raman and TPR measurements. It was established an increase of the ceria dispersion and as well as slightly increase of the gold particle size. In the presence of alumina after catalytic operation the dispersion of gold and ceria practically does not change. The lower WGS activity on gold/ceria–alumina can be explained on the basis of reduction–oxidation cycle of the reaction. It was established no efficiency re-oxidation of the catalyst surface at the temperatures of the reaction test by the water vapour and we consider this as a main reason of the lower catalytic activity.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2006.01.009