Understanding the role of promoters in catalysis: operando XAFS/DRIFTS study of CeO_x/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 CeO_x/Pt/Al₂O₃ during CO oxidation. Catalysis, Structure & Reactivity, 3(1-2) pp. 5–12.

DOI: https://doi.org/10.1080/2055074X.2017.1278890

Abstract

A combined operando XAFS/DRIFTS study on CeO_x/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 CeO_x is evidenced by the improved performance towards CO oxidation, compared to the non-CeO_x modified Pt/Al₂O₃, and changes in the CO adsorption properties on Pt previously linked to Pt-CeO₂ interfaces.

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