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- Title
Identification of the Active Sites of Platinum-Ceria Catalysts in Propane Oxidation and Preferential Oxidation of Carbon Monoxide in Hydrogen.
- Authors
Zhang, Kefeng; Li, Qinlin; Liao, Weiqi; Wang, Ziwei; Yuan, Zheliang; Lu, Jiqing; Zhang, Zhenhua
- Abstract
Supported platinum catalysts exhibit versatile applications in heterogeneous catalysis while their active sites are identified difficultly due to the structural complexity of solid catalysts. Herein, via a comprehensive microscopic and spectroscopic study using several PtOx/CeO2 catalysts with well-controlled CeO2 morphology, we found that, besides the CeO2 morphology, the structure of supported platinum species over PtOx/CeO2 catalysts is determined by the reaction atmosphere, dominantly forming components of the platinum-ceria solid solution and fine Pt nanoparticles during propane oxidation and preferential oxidation of CO in hydrogen (CO-PROX) reactions, respectively. Catalytic performance of the platinum-ceria catalysts in propane oxidation is tightly associated with the content of metallic Pt sites which is affected by reducibility of platinum-ceria solid solution, whereas the Pt(II) species arising from the Pt-CeO2 interaction coupling with the surface oxygen vacancy concentration of ceria contribute to the CO reactivity in CO-PROX reaction. There results provide insights into the active sites of platinum-ceria catalysts in both reactions and broadens the concept of morphology-dependent catalysis of oxide-based nanocrystal catalysts that varies with the reactions catalyzed.
- Subjects
PLATINUM; OXIDATION of carbon monoxide; PLATINUM catalysts; CATALYSTS; HETEROGENEOUS catalysis; HYDROGEN oxidation; PROPANE
- Publication
Catalysis Letters, 2023, Vol 153, Issue 12, p3634
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-022-04254-2