Substrate-mediated oxidation of carbon residues by TiO2{110}-supported model catalysts: Metal-, precursor-, and treatment-dependent labilization of framework oxygen
Substrate-mediated oxidation of carbon residues by TiO2{110}-supported model catalysts: Metal-, precursor-, and treatment-dependent labilization of framework oxygen
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.
rhodium gem-dicarbonyl, supported rh catalysts, chemisorptive
properties, electron-microscopy, geminal dicarbonyl, rh/ceo2 catalysts, tio2(110), rh/tio2, surface, smsi
8548-8553
Newton, M. A.
c2955c76-361e-4cfd-bea1-e66ec3ae7ce4
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69
Hayden, B. E.
aea74f68-2264-4487-9d84-5b12ddbbb331
7 September 2000
Newton, M. A.
c2955c76-361e-4cfd-bea1-e66ec3ae7ce4
Evans, J.
05890433-0155-49fe-a65d-38c90ea25c69
Hayden, B. E.
aea74f68-2264-4487-9d84-5b12ddbbb331
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.
The Journal of Physical Chemistry B, 104 (35), .
(doi:10.1021/jp001499m).
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.
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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: 1520-5207
PURE UUID: 13be4ebc-9356-4759-ad77-2ea4007b9ffc
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Date deposited: 05 Jan 2006
Last modified: 29 Oct 2024 02:32
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Author:
M. A. Newton
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