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Identification of the Active Sites of Platinum-Ceria Catalysts in Propane Oxidation and Preferential Oxidation of Carbon Monoxide in Hydrogen

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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.

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Funding

Jinhua Industrial Key Project, 20221080, self-designed scientific research project of Zhejiang Normal University, 2021ZS0602, Natural Science Foundation of Zhejiang Province, LQ20B030007, This work is financially supported by the National Natural Science Foundation of China (No. 22102146).

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  1. Kefeng Zhang, Qinlin Li have equally contributed to this work.

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  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, People’s Republic of China

    Kefeng Zhang, Qinlin Li, Weiqi Liao, Ziwei Wang, Zheliang Yuan, Jiqing Lu & Zhenhua Zhang

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  1. Kefeng Zhang
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ZZ designed and supervised the project. KZ and QL carried out all experiments. ZW, WL, ZY, and JL assisted with the experiments. ZZ prepared the manuscript and other authors commented on the manuscript.

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Zhang, K., Li, Q., Liao, W. et al. Identification of the Active Sites of Platinum-Ceria Catalysts in Propane Oxidation and Preferential Oxidation of Carbon Monoxide in Hydrogen. Catal Lett 153, 3634–3650 (2023). https://doi.org/10.1007/s10562-022-04254-2

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