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Total oxidation of propane over Pt-V/SiO2 catalysts: Remarkable enhancement of activity by vanadium promotion.

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Title: Total oxidation of propane over Pt-V/SiO2 catalysts: Remarkable enhancement of activity by vanadium promotion.
Authors: Liao, Wen-Min1 (AUTHOR), Liu, Yan-Rong1 (AUTHOR), Zhao, Pei-Pei1 (AUTHOR), Cen, Bing-Heng1 (AUTHOR), Tang, Cen1 (AUTHOR), Jia, Ai-Ping1 (AUTHOR), Lu, Ji-Qing1 (AUTHOR) jiqinglu@zjnu.cn, Luo, Meng-Fei1 (AUTHOR) mengfeiluo@zjnu.cn
Source: Applied Catalysis A: General. Jan2020, Vol. 590, pN.PAG-N.PAG. 1p.
Subjects: Propane, Catalysts, Vanadium, Oxidation, Acidity, Oxidative dehydrogenation, Dehydrogenation
Abstract: • The addition of V 2 O 5 in the 2 Pt/SiO 2 (with a Pt content of 2 wt.%) greatly improves the activity. • The improvement is due to the enhanced reducibility and surface acidity. • Higher propane coverage on the 2 Pt-3 V/SiO 2 (with a V content of 3 wt.%) is related to its higher surface acidity. • The kinetic relevant step is the propane activation on partially oxygen covered Pt pair sites. • Propane could also adsorb on VO x and react with oxygen at Pt-V interface. The addition of V 2 O 5 in the Pt/SiO 2 catalysts greatly improves their activities for total oxidation of propane. The much higher activity on the catalyst with a Pt content of 2 wt.% and a V content of 10 wt.% (2 Pt-10 V/SiO 2) (153.2 μmol g Pt −1 s−1 at 200 °C) than that on the 2 Pt/SiO 2 (9.8 μmol g Pt −1 s−1) is due to the enhanced reducibility and surface acidity by the V 2 O 5 promotion. Kinetic investigations reveal that the propane coverage on the 2 Pt-3 V/SiO 2 is higher than that on the 2 Pt/SiO 2 , due to the presence of additional acid sites by V 2 O 5 promotion. The rate determining step is the activation of propane on the partially oxygen covered Pt pair sites (*-O*), on which propane could be activated on the metallic Pt atom and react with oxygen on the oxidized Pt species. Additional Pt-V interfacial active sites may exist in the V-promoted catalyst, on which propane adsorbed on VO x could react with oxygen on the Pt oxide. [ABSTRACT FROM AUTHOR]
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Abstract:• The addition of V 2 O 5 in the 2 Pt/SiO 2 (with a Pt content of 2 wt.%) greatly improves the activity. • The improvement is due to the enhanced reducibility and surface acidity. • Higher propane coverage on the 2 Pt-3 V/SiO 2 (with a V content of 3 wt.%) is related to its higher surface acidity. • The kinetic relevant step is the propane activation on partially oxygen covered Pt pair sites. • Propane could also adsorb on VO x and react with oxygen at Pt-V interface. The addition of V 2 O 5 in the Pt/SiO 2 catalysts greatly improves their activities for total oxidation of propane. The much higher activity on the catalyst with a Pt content of 2 wt.% and a V content of 10 wt.% (2 Pt-10 V/SiO 2) (153.2 μmol g Pt −1 s−1 at 200 °C) than that on the 2 Pt/SiO 2 (9.8 μmol g Pt −1 s−1) is due to the enhanced reducibility and surface acidity by the V 2 O 5 promotion. Kinetic investigations reveal that the propane coverage on the 2 Pt-3 V/SiO 2 is higher than that on the 2 Pt/SiO 2 , due to the presence of additional acid sites by V 2 O 5 promotion. The rate determining step is the activation of propane on the partially oxygen covered Pt pair sites (*-O*), on which propane could be activated on the metallic Pt atom and react with oxygen on the oxidized Pt species. Additional Pt-V interfacial active sites may exist in the V-promoted catalyst, on which propane adsorbed on VO x could react with oxygen on the Pt oxide. [ABSTRACT FROM AUTHOR]
ISSN:0926860X
DOI:10.1016/j.apcata.2019.117337