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Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeO x /Pt/Al 2 O 3 during CO oxidation

DOI: 10.1080/2055074X.2017.1278890 DOI Help

Authors: E. K. Gibson (Rutherford Appleton Laboratory; University College London) , E. M. Crabb (Open University) , D. Gianolio (Diamond Light Source) , A. E. Russell (University of Southampton) , D. Thompsett (Johnson Matthey Technology Centre) , P. P. Wells (Rutherford Appleton Laboratory; Diamond Light Source; University of Southampton)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Catalysis, Structure & Reactivity , VOL 3 , PAGES 5 - 12

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 8071

Open Access Open Access

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.

Journal Keywords: Operando; XAFS; DRIFTS; CO oxidation; Pt/Al2O3; catalysis; ceria

Subject Areas: Chemistry

Instruments: B18-Core EXAFS