Influence of carrier doping on the interaction of benzene and toluene with supported rhodium

T. Ioannides, M. Tsapatsis, M. Koussathana, X. E. Verykios

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11 Scopus citations

Abstract

The interaction of benzene and toluene with rhodium crystallites dispersed on TiO2 carriers doped with W6+ cations of variable concentration is investigated employing steady-state hydrogenation, competitive hydrogenation, temperature-programmed desorption (TPD) and temperature-programmed surface reaction (TPSR). Turnover frequencies of both hydrogenation reactions are enhanced when Rh is dispersed on W6+-doped TiO2, while the ratio of the adsorption coefficients of toluene to benzene is reduced. The latter result implies that the toluene-Rh interaction has been weakened to a larger extent than the benzene-Rh interaction. TPD and TPSR experiments also reveal weakened adsorption bands of benzene and toluene with Rh supported on doped TiO2. These observations are discussed with respect to short-range and long-range electronic interactions at the metal-support interface, evoking the theory of metal-semiconductor contacts.

Original languageEnglish (US)
Pages (from-to)331-340
Number of pages10
JournalJournal of Catalysis
Volume152
Issue number2
DOIs
StatePublished - Apr 1 1995

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