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An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania
Author(s) -
Samokhvalov Alexander,
Duin Eduardus C.,
Nair Sachin,
Tatarchuk Bruce J.
Publication year - 2010
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3314
Subject(s) - x ray photoelectron spectroscopy , thiophene , oxygen , sorbent , chemistry , inorganic chemistry , stoichiometry , chemical reaction , oxide , adsorption , electron paramagnetic resonance , radical , photochemistry , chemical engineering , organic chemistry , physics , nuclear magnetic resonance , engineering
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 Ti 3+ 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 Ag 2 S without formation of the transient surface sulfates or sulfites and is further oxidized by molecular oxygen. Copyright © 2010 John Wiley & Sons, Ltd.