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Article Dans Une Revue Nature Communications Année : 2023

Reverse oxygen spillover triggered by CO adsorption on Sn-doped Pt/TiO2 for low-temperature CO oxidation

Jianjun Chen
Shangchao Xiong
Haiyan Liu
  • Fonction : Auteur
Jianqiang Shi
  • Fonction : Auteur
Jinxing Mi
  • Fonction : Auteur
Hao Liu
  • Fonction : Auteur
Zhengjun Gong
Laetitia Oliviero
Françoise Maugé
Junhua Li

Résumé

Abstract The spillover of oxygen species is fundamentally important in redox reactions, but the spillover mechanism has been less understood compared to that of hydrogen spillover. Herein Sn is doped into TiO 2 to activate low-temperature (<100 °C) reverse oxygen spillover in Pt/TiO 2 catalyst, leading to CO oxidation activity much higher than that of most oxide-supported Pt catalysts. A combination of near-ambient-pressure X-ray photoelectron spectroscopy, in situ Raman/Infrared spectroscopies, and ab initio molecular dynamics simulations reveal that the reverse oxygen spillover is triggered by CO adsorption at Pt 2+ sites, followed by bond cleavage of Ti-O-Sn moieties nearby and the appearance of Pt 4+ species. The O in the catalytically indispensable Pt-O species is energetically more favourable to be originated from Ti-O-Sn. This work clearly depicts the interfacial chemistry of reverse oxygen spillover that is triggered by CO adsorption, and the understanding is helpful for the design of platinum/titania catalysts suitable for reactions of various reactants.

Domaines

Chimie Catalyse
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Dates et versions

hal-04239732 , version 1 (23-11-2023)

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Citer

Jianjun Chen, Shangchao Xiong, Haiyan Liu, Jianqiang Shi, Jinxing Mi, et al.. Reverse oxygen spillover triggered by CO adsorption on Sn-doped Pt/TiO2 for low-temperature CO oxidation. Nature Communications, 2023, 14 (1), pp.3477. ⟨10.1038/s41467-023-39226-6⟩. ⟨hal-04239732⟩
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