An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania |
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| Authors: | Alexander Samokhvalov Eduardus C. Duin Sachin Nair Bruce J. Tatarchuk |
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| Affiliation: | 1. Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA;2. Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA |
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| Abstract: | The Ag/titania sorbent for the ultradeep desulfurization of liquid fuels was characterized by electron spin resonance and was found to contain nearly the stoichiometric titania, without significant concentration of Ti3+ or the reactive oxygen species. The surface chemical reactions of thiophene adsorbed on the Ag/titania were studied by temperature‐programmed XPS from 25 to 525 °C upon in situ thermal annealing in high vacuum and in situ oxidation by oxygen gas. The titania support is not chemically reactive under those conditions. Silver oxide in the Ag/titania sorbent is converted to Ag2 S without formation of the transient surface sulfates or sulfites and is further oxidized by molecular oxygen. Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | thiophene desulfurization sorbent in situ temperature‐programmed XPS electron spin resonance (ESR) surface chemical reaction Ag/titania |
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