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- W2046479058 abstract "In an effort to model the “working surface” of a ruthenium catalyst, the adsorption and decomposition of thiophene have been investigated over clean and sulfur precovered Ru(0001) (0 < θs < 0.45) using TDS/TPRS, XPS and EELS. On clean Ru(0001), intact thiophene desorbs at exposures ⩾ 0.1 L and shifts from 174 to 168 K with increasing coverage, while multilayer features become evident at 145 K. Thiophene is proposed to decompose via a three-step mechanism involving: (i) initial thiophene cracking at 120 K for low coverages (< 0.1 L) yielding surface sulfur and hydrocarbon fragments followed by intact thiophene adsorption, (ii) hydrogen desorption near 230 K resulting in additional decomposition ensembles on the surface, and (iii) continued decomposition to form “metallocycle-like” intermediates which retain EELS features similar to thiophene. EELS results from 2,5-dideuterothiophene also suggest that dehydrogenation of the metallocycle commences at the α position. Dehydrogenation is complete by 600 K. On sulfur precovered Ru(0001), the sticking coefficient of thiophene is decreased, while the desorption shifts from 168 to 178 K with increasing sulfur coverages. Sulfur appears to decrease irreversible thiophene adsorption by blocking decomposition ensembles." @default.
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- W2046479058 date "1989-01-01" @default.
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- W2046479058 title "Thiophene adsorption on clean and sulfur precovered Ru(0001)" @default.
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- W2046479058 doi "https://doi.org/10.1016/0039-6028(89)90125-8" @default.
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