Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeOx/Pt/Al2O3 during CO oxidation

Gibson, E.K. , Crabb, E.M., Gianolio, D., Russell, A.E., Thompsett, D. and Wells, P.P. (2017) Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeOx/Pt/Al2O3 during CO oxidation. Catalysis, Structure and Reactivity, 3(1-2), pp. 5-12. (doi: 10.1080/2055074X.2017.1278890)

Abstract

A combined operando XAFS/DRIFTS study on CeOx/Pt/Al2O3 catalysts has been performed during CO oxidation and provides insights into the changes in nanoparticle structure and adsorbed species during the reaction profile. The onset of CO2 formation is shown to be concurrent with a rapid re-oxidation of the Pt nanoparticles, evidenced by XAFS spectroscopy, and the loss of bridge bonded CO adsorbed on Pt, as shown by simultaneous DRIFTS acquisition. The continued appearance of linear bound CO on the catalyst surface is shown to remain long after catalytic light off. The interaction of Pt and CeOx is evidenced by the improved performance towards CO oxidation, compared to the non-CeOx modified Pt/Al2O3, and changes in the CO adsorption properties on Pt previously linked to Pt-CeO2 interfaces.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Gibson, Dr Emma
• Authors: Gibson, E.K., Crabb, E.M., Gianolio, D., Russell, A.E., Thompsett, D., and Wells, P.P.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Catalysis, Structure and Reactivity
• Publisher: Taylor and Francis
• ISSN: 2055-074X
• Published Online: 14 February 2017
• Copyright Holders: Copyright © 2017 The Authors
• First Published: First published in Catalysis, Structure and Reactivity 3(1-2):5-12
• Publisher Policy: Reproduced under a Creative Commons License