Substrate-mediated oxidation of carbon residues by TiO2{110}-supported model catalysts: Metal-, precursor-, and treatment-dependent labilization of framework oxygen


Newton, M. A., Evans, J. and Hayden, B. E. (2000) Substrate-mediated oxidation of carbon residues by TiO2{110}-supported model catalysts: Metal-, precursor-, and treatment-dependent labilization of framework oxygen. Journal of Physical Chemistry B, 104, (35), 8548-8553. (doi: 10.1021/jp001499m).

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Description/Abstract

Thermal and chemical treatment of metallo-organic chemical vapor deposition (MOCVD)-prepared Rh and Pd model catalysts, supported on TiO2(110), lead to the formation of carbon residues that are oxidized to CO at elevated temperatures. These processes are metal, metal precursor, and surface- treatment dependent. In the absence of surface Cl, Rh precursors exhibit surface carbon oxidation, at T > 775 K. In the case of Pd this is not seen until T > 825 K and some carbon is always found to remain. Room-temperature reduction of the model catalysts using hydrogen progressively lowers the temperature of carbon oxidation. However, reduction of a Cl-containing system dramatically promotes CO oxidation/Ar expulsion in a manner that is kinetically distinct from that observed in the absence of Cl. These observations are discussed in terms of the mobility of surface oxygen species on TiO2{110}, metal-support interactions, and the effect of Cl incorporation into the TiO2 substrate.

Item Type: Article
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Keywords: rhodium gem-dicarbonyl, supported rh catalysts, chemisorptive properties, electron-microscopy, geminal dicarbonyl, rh/ceo2 catalysts, tio2(110), rh/tio2, surface, smsi
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 18895
Date Deposited: 05 Jan 2006
Last Modified: 27 Mar 2014 18:08
Contact Email Address: beh@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/18895

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