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Activity and deactivation of Au/Al2O3 catalyst for low-temperature CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53115 46911 2007 5 PDF Available
Title
Activity and deactivation of Au/Al2O3 catalyst for low-temperature CO oxidation
Abstract

Au/Al2O3 catalyst was investigated with respect to its activity for low-temperature CO oxidation. The activity changes of the catalyst were examined after separate treatment in the following different atmosphere: (i) O2 + N2 + CO; (ii) O2 + N2 heated above 100 °C and (iii) O2 + N2 + H2O vapor. The results show that each of the treatments above may deactivate the catalyst to the different degree. The deactivation by CO oxidation is mainly due to the accumulation of carbonate-like species on the catalyst surface. The addition of H2O vapor may inhibit the deactivation effectively. The removal of hydroxyl groups at active sites during heating may be responsible for the deactivation by thermal treatment. These two kinds of deactivations are reversible. The irreversible deactivation by H2O vapor treatment is mainly caused by the growth of gold particles size.

Keywords
Supported Au/Al2O3 catalyst; CO oxidation; Deactivation; Treatment
First Page Preview
Activity and deactivation of Au/Al2O3 catalyst for low-temperature CO oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 5, May 2007, Pages 784–788
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis