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Synergistic roles of Pt0 and Pt2+ species in propane combustion over high-performance Pt/AlF3 catalysts.

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Title: Synergistic roles of Pt0 and Pt2+ species in propane combustion over high-performance Pt/AlF3 catalysts.
Authors: Li, Xue1, Liu, Yan-Rong1, Liao, Wen-Min1, Jia, Ai-Ping1, Wang, Yue-Juan1, Lu, Ji-Qing1 jiqinglu@zjnu.cn, Luo, Meng-Fei1 mengfeiluo@zjnu.cn
Source: Applied Surface Science. May2019, Vol. 475, p524-531. 8p.
Subjects: Platinum, Aluminum oxide, Propane, Catalysts, Catalytic activity
Abstract: Graphical abstract Highlights • Pt supported on AlF 3 are very active and stable for catalytic combustion of propane. • The Pt/AlF 3 is more active than Pt/Al 2 O 3 due to its higher metallic Pt content. • Pt0 species are stabilized under reaction condition due to strong Pt AlF 3 interaction. • Synergistic roles of Pt0 Pt2+ might be related to the reaction mechanism. Abstract Catalytic propane combustion was performed on a series of supported Pt/AlF 3 catalysts. These catalysts are very active and stable in the reaction, and the 0.2Pt/AlF 3 catalyst gives the highest specific reaction rate of 207.3 μmol g Pt −1 s−1 at 220 °C. The 1Pt/AlF 3 is much more active than the reference Pt/Al 2 O 3 catalyst, due to its higher content of metallic Pt species than that in the Pt/Al 2 O 3. Furthermore, turnover frequency (TOF) based on Pt dispersion increases with the surface concentration of metallic Pt0 in the catalyst, suggesting these species might be the active sites. Furthermore, synergistic roles of metallic and oxidized Pt species are found, as the TOFs calculated based on surface Pt0 concentration reaches a maximum at the Pt0/Pt2+ molar ratio of about 1. Such optimal Pt0/Pt2+ ratio implies the requirement of Pt0 Pt2+ pair in the reaction, probably due to the activation and cleavage of C H bond on metallic Pt atom and the sequential oxidation on the oxidized Pt atoms. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Graphical abstract Highlights • Pt supported on AlF 3 are very active and stable for catalytic combustion of propane. • The Pt/AlF 3 is more active than Pt/Al 2 O 3 due to its higher metallic Pt content. • Pt0 species are stabilized under reaction condition due to strong Pt AlF 3 interaction. • Synergistic roles of Pt0 Pt2+ might be related to the reaction mechanism. Abstract Catalytic propane combustion was performed on a series of supported Pt/AlF 3 catalysts. These catalysts are very active and stable in the reaction, and the 0.2Pt/AlF 3 catalyst gives the highest specific reaction rate of 207.3 μmol g Pt −1 s−1 at 220 °C. The 1Pt/AlF 3 is much more active than the reference Pt/Al 2 O 3 catalyst, due to its higher content of metallic Pt species than that in the Pt/Al 2 O 3. Furthermore, turnover frequency (TOF) based on Pt dispersion increases with the surface concentration of metallic Pt0 in the catalyst, suggesting these species might be the active sites. Furthermore, synergistic roles of metallic and oxidized Pt species are found, as the TOFs calculated based on surface Pt0 concentration reaches a maximum at the Pt0/Pt2+ molar ratio of about 1. Such optimal Pt0/Pt2+ ratio implies the requirement of Pt0 Pt2+ pair in the reaction, probably due to the activation and cleavage of C H bond on metallic Pt atom and the sequential oxidation on the oxidized Pt atoms. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2018.12.213