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In situ XAS with high-energy resolution: the changing structure of platinum during the oxidation of carbon monoxide

In situ XAS with high-energy resolution: the changing structure of platinum during the oxidation of carbon monoxide
In situ XAS with high-energy resolution: the changing structure of platinum during the oxidation of carbon monoxide
The catalytically active speci0920-5861es during the oxidation of carbon monoxide over a real alumina-supported
platinum catalyst under atmospheric pressure are determined by combining in situ high-energy
resolution fluorescence detection X-ray absorption spectroscopy (HERFD XAS) at the Pt L3 edge and
kinetic measurements. Catalysts were prepared by incipient wetness impregnation.

The oxidation of carbon monoxide occurred in two distinctive regimes, a high-activity regime and a low-activity regime, which have high and low rates of reaction respectively. In the low-activity region, the catalyst is poisoned by carbon monoxide, limiting the dissociative adsorption of oxygen. In the high-activity
regime, all CO is desorbed from the surface, increasing the rate of reaction. The low carbon monoxide concentration enables oxygen to react to the surface in this reaction regime generating a more reactive surface.

HERFD showed that different phases are active depending on the reaction conditions in nanosized catalyst particles.
platinum, HERFD XAS, carbon monoxide oxidation, in situ
0920-5861
300-306
Singh, J.
b3066746-23cb-4292-87c6-be4656fd0561
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
Safonova, O. V.
5598618f-49b2-494f-b99f-554d1bd2292e
Glatzel, P.
d2e6b4a9-602e-490b-918e-4f778138438d
van Bokhoven, J. A.
fb947f00-2d17-44e7-aea4-bcdf175bafb2
Singh, J.
b3066746-23cb-4292-87c6-be4656fd0561
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
Safonova, O. V.
5598618f-49b2-494f-b99f-554d1bd2292e
Glatzel, P.
d2e6b4a9-602e-490b-918e-4f778138438d
van Bokhoven, J. A.
fb947f00-2d17-44e7-aea4-bcdf175bafb2

Singh, J., Tromp, M., Safonova, O. V., Glatzel, P. and van Bokhoven, J. A. (2009) In situ XAS with high-energy resolution: the changing structure of platinum during the oxidation of carbon monoxide. Catalysis Today, 145 (3-4), 300-306. (doi:10.1016/j.cattod.2008.11.019).

Record type: Article

Abstract

The catalytically active speci0920-5861es during the oxidation of carbon monoxide over a real alumina-supported
platinum catalyst under atmospheric pressure are determined by combining in situ high-energy
resolution fluorescence detection X-ray absorption spectroscopy (HERFD XAS) at the Pt L3 edge and
kinetic measurements. Catalysts were prepared by incipient wetness impregnation.

The oxidation of carbon monoxide occurred in two distinctive regimes, a high-activity regime and a low-activity regime, which have high and low rates of reaction respectively. In the low-activity region, the catalyst is poisoned by carbon monoxide, limiting the dissociative adsorption of oxygen. In the high-activity
regime, all CO is desorbed from the surface, increasing the rate of reaction. The low carbon monoxide concentration enables oxygen to react to the surface in this reaction regime generating a more reactive surface.

HERFD showed that different phases are active depending on the reaction conditions in nanosized catalyst particles.

Full text not available from this repository.

More information

Published date: 30 July 2009
Keywords: platinum, HERFD XAS, carbon monoxide oxidation, in situ

Identifiers

Local EPrints ID: 146071
URI: http://eprints.soton.ac.uk/id/eprint/146071
ISSN: 0920-5861
PURE UUID: c788fb6f-cb30-459b-8e09-034441520953

Catalogue record

Date deposited: 20 Apr 2010 13:25
Last modified: 17 Jul 2019 00:05

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