Reaction of SO2 with Au∕CeO2(111): Importance of O vacancies in the activation of gold
Authors:
- 22 June 2005
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 122 (24) , 241101
Abstract
Synchrotron-based high-resolution photoemission was used to study the adsorption and chemistry of SO2 on Au∕CeO2(111) and AuOx∕CeO2 surfaces. The heat of adsorption of the molecule on Au nanoparticles supported on stoichiometric CeO2(111) was 4–7kcal∕mol larger than on Au(111). However, there was negligible dissociation of SO2 on the Au∕CeO2(111) surfaces. The full decomposition of SO2 was observed only after introducing O vacancies in the ceria support. AuOx∕CeO2 surfaces were found to be much less chemically active than Au∕CeO2(111) or Au∕CeO2−x(111) surfaces. The active sites in {Au+AuOx}∕ceria catalysts should involve pure gold nanoparticles in contact with O vacancies.Keywords
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