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TAP studies of CO oxidation over CuMnOX and Au/CuMnOX catalysts

Morgan, Kevin, Cole, Kieran J., Goguet, Alexandre, Hardacre, Christopher, Hutchings, Graham John, Maguire, Nolene, Shekhtman, Sergiy O. and Taylor, Stuart Hamilton 2010. TAP studies of CO oxidation over CuMnOX and Au/CuMnOX catalysts. Journal of Catalysis 276 (1) , pp. 38-48. 10.1016/j.jcat.2010.08.013

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Abstract

The mechanism of CO oxidation reactions over undoped and gold-doped CuMnOX (Hopcalite) catalysts has been examined using a temporal analysis of products (TAP) reactor. Gold doping has been found to increase the activity of the mixed oxide catalyst significantly; however, using consecutive pulsing TAP experiments, the presence of gold was not found to affect the contribution of the Langmuir-Hinshelwood mechanism. Conversely, gold doping was found to promote the Mars van Krevelen mechanism. Using CO and O2 multi-pulse TAP experiments, the gold was found to modify the catalyst surface such that it stores much more oxygen that is active for the CO oxidation. The CO multi-pulse experiments indicated that two distinct types of active oxygen species were found to be involved in the CO oxidation. One type was observed in a similar amount on both doped and undoped catalysts and was associated with mixed oxide, while the second type was only found on the gold-doped catalyst and was therefore clearly associated with the presence of gold on the catalyst surface. The latter was found to be much less active than the oxygen inherent to the oxide but was at a concentration of approximately 10 times larger leading to the enhanced activity observed on gold doping. © 2010 Elsevier Inc. All rights reserved.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Active oxygen species; Catalyst surfaces; CO oxidation; Hopcalite; Langmuir Hinshelwood mechanism; Low temperature; Mars-van Krevelen; Mixed oxide; Mixed oxide catalysts; Multipulses; Temporal analysis of product; Temporal analysis of products reactors, Carbon monoxide; Catalysts; Doping (additives); Experiments; Ionization of gases; Lead oxide; Oxidation; Oxygen, Gold
Additional Information: cited By (since 1996) 2
Publisher: Academic Press
ISSN: 00219517
Last Modified: 04 Jun 2017 02:10
URI: http://orca-mwe.cf.ac.uk/id/eprint/10229

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