An in situ temperature-programmed XPS study of the surface chemical reactions of thiophene with Ag/titania

作者：Samokhvalov Alexander^*; Duin Eduardus C; Nair Sachin; Tatarchuk Bruce J

来源：Surface and Interface Analysis, 2010, 42(9): 1476-1482.

DOI：10.1002/sia.3314

• thiophene
• desulfurization sorbent
• in situ temperature-programmed XPS
• electron spin resonance (ESR)
• surface chemical reaction
• Ag/titania

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 degrees 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.

• 出版日期2010-9