Effects of incorporation of ions into Au/TiO2 catalysts for carbon monoxide oxidation |
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| Authors: | J. A. Moma M. S. Scurrell W. A. Jordaan |
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| Affiliation: | (1) Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, WITS, Private Bag X3, Johannesburg, 2050, South Africa;(2) National Metrology Laboratory, CSIR, P O Box 395, Pretoria, 0001, South Africa |
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| Abstract: | ![]()
A number of anions and cations have been incorporated into TiO2 as support for gold catalysts and also into as-prepared Au/TiO2 catalysts at levels of 0.4 mol% and 2.5 mol% with respect to the support. The activities of the catalysts for CO oxidation reveal that the at the higher concentration level of the ions, in all cases, a decrease in activity compared with unmodified Au/TiO2. However, and more interestingly, addition of only 0.4 mol% of the ions to the support, prior to gold addition, in most cases resulted in activity enhancement whilst similar addition to Au/TiO2 resulted in decrease in activity. Attempts have been made to understand the origin of these effects. |
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| Keywords: | dimethylamine pyridine STM amide surface Cu(110) amine oxide gold carbon monoxide oxidation titania promotion XPS SIMS |
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