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

Record type: Article

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.

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Citation

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), pp. 8548-8553. (doi:10.1021/jp001499m).

More information

Published date: 7 September 2000
Keywords: rhodium gem-dicarbonyl, supported rh catalysts, chemisorptive properties, electron-microscopy, geminal dicarbonyl, rh/ceo2 catalysts, tio2(110), rh/tio2, surface, smsi

Identifiers

Local EPrints ID: 18895
URI: http://eprints.soton.ac.uk/id/eprint/18895
ISSN: 1089-5647
PURE UUID: 13be4ebc-9356-4759-ad77-2ea4007b9ffc
ORCID for B. E. Hayden: ORCID iD orcid.org/0000-0002-7762-1812

Catalogue record

Date deposited: 05 Jan 2006
Last modified: 17 Jul 2017 16:34

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Contributors

Author: M. A. Newton
Author: J. Evans
Author: B. E. Hayden ORCID iD

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