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Structure-performance relationships of Rh and RhPd alloy supported catalysts using EDE/DRIFTS/MS

Structure-performance relationships of Rh and RhPd alloy supported catalysts using EDE/DRIFTS/MS
Structure-performance relationships of Rh and RhPd alloy supported catalysts using EDE/DRIFTS/MS
Energy dispersive extended X-ray absorption fine structure spectroscopy (ED-XAFS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS), have been combined for the structure–function study of Rh and RhPd supported catalysts for the reduction of NO by CO. The combined results show that although alloying of Rh with Pd prevents the dissociative oxidation of the Rh by NO, it does not prevent the extensive disruptive oxidation of Rh by CO. The influence of oxidative disruption by molecular CO in such systems may therefore be far more pervasive and catalytically important than has been previously observed. The overall metal particle size observed in the RhPd alloy system during the CO/NO reaction is significantly larger than for the Rh-only
system for the entire temperature range employed. The catalytically active sites, however, are likely to be similar, with the overall activity of the alloy system to be reduced due to inactive RhPd alloy nanoparticles.
0301-7249
287-300
Dent, Andy J.
43d27d73-de43-4e9a-a21e-65c6095a7bf4
Evans, John
05890433-0155-49fe-a65d-38c90ea25c69
Fiddy, Steven G.
f6c255cf-6aa1-4798-85ca-1a2ccdaa1186
Jyoti, Bhrat
9e00e347-0864-48fa-9bb8-f44f98161fd0
Newton, Mark A.
73aab2af-4641-47f3-89ad-3b7d3026164f
Tromp, Moniek
48c1ebbb-579c-42b6-83bb-7188c668b322
Dent, Andy J.
43d27d73-de43-4e9a-a21e-65c6095a7bf4
Evans, John
05890433-0155-49fe-a65d-38c90ea25c69
Fiddy, Steven G.
f6c255cf-6aa1-4798-85ca-1a2ccdaa1186
Jyoti, Bhrat
9e00e347-0864-48fa-9bb8-f44f98161fd0
Newton, Mark A.
73aab2af-4641-47f3-89ad-3b7d3026164f
Tromp, Moniek
48c1ebbb-579c-42b6-83bb-7188c668b322

Dent, Andy J., Evans, John, Fiddy, Steven G., Jyoti, Bhrat, Newton, Mark A. and Tromp, Moniek (2008) Structure-performance relationships of Rh and RhPd alloy supported catalysts using EDE/DRIFTS/MS. Faraday Discussions, 138, 287-300. (doi:10.1039/b706294j).

Record type: Article

Abstract

Energy dispersive extended X-ray absorption fine structure spectroscopy (ED-XAFS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and mass spectrometry (MS), have been combined for the structure–function study of Rh and RhPd supported catalysts for the reduction of NO by CO. The combined results show that although alloying of Rh with Pd prevents the dissociative oxidation of the Rh by NO, it does not prevent the extensive disruptive oxidation of Rh by CO. The influence of oxidative disruption by molecular CO in such systems may therefore be far more pervasive and catalytically important than has been previously observed. The overall metal particle size observed in the RhPd alloy system during the CO/NO reaction is significantly larger than for the Rh-only
system for the entire temperature range employed. The catalytically active sites, however, are likely to be similar, with the overall activity of the alloy system to be reduced due to inactive RhPd alloy nanoparticles.

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More information

e-pub ahead of print date: 14 September 2007
Published date: January 2008
Additional Information: FD138: Nanoalloys: From Theory to Applications University of Birmingham 3–5 Sep 2007 www.rsc.org/FD138

Identifiers

Local EPrints ID: 47153
URI: http://eprints.soton.ac.uk/id/eprint/47153
ISSN: 0301-7249
PURE UUID: 99b44fcd-5581-444b-a632-de86046fffd9

Catalogue record

Date deposited: 02 Aug 2007
Last modified: 13 Mar 2019 21:00

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