The effect of Al3+ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al2O3 catalysts

doi:10.1016/j.jechem.2019.04.027

能源化学(英文版) ›› 2020, Vol. 41 ›› Issue (2): 93-99.DOI: 10.1016/j.jechem.2019.04.027

The effect of Al³⁺ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al₂O₃ catalysts

Qinqin Yu, Tie Yu, Hongyu Chen, Guangzong Fang, Xiulian Pan, Xinhe Bao

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

收稿日期:2019-03-20 修回日期:2019-04-23 出版日期:2020-02-15 发布日期:2020-12-18
基金资助:
The authors are grateful to the National Natural Science Foundation of China (No. 21676195) and the China Postdoctoral Science Foundation (2016M601347).

The effect of Al³⁺ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al₂O₃ catalysts

Qinqin Yu, Tie Yu, Hongyu Chen, Guangzong Fang, Xiulian Pan, Xinhe Bao

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

Received:2019-03-20 Revised:2019-04-23 Online:2020-02-15 Published:2020-12-18
Contact: Tie Yu
Supported by:
The authors are grateful to the National Natural Science Foundation of China (No. 21676195) and the China Postdoctoral Science Foundation (2016M601347).

摘要/Abstract

摘要： The effect of the Al₂O₃ structure on the performance of Pt/Ga/Al₂O₃ catalysts is investigated for the direct dehydrogenation of propane. The study unveils that the structure of Al³⁺ determines the bulk structure of catalysts, particularly a high content of coordinatively unsaturated Al³⁺ sites (penta-coordinated Al³⁺, denoted as Al³⁺_penta) could lead to a remarkably improved dehydrogenation activity of the catalyst. The bulk characterization reveals that the sufficient amount of Al³⁺_penta in Al₂O₃ benefit the dispersion of Pt and Ga₂O₃ on the Al₂O₃ support. At the same time, TPR results reveal that the presence of Pt facilitates the reduction of Ga₂O₃, likely due to the hydrogen spillover between the well dispersed Pt and Ga₂O₃, which consequently enhances the synergistic function between Pt and Ga₂O₃ in the dehydrogenation of propane. Recyclability tests demonstrate that the dehydrogenation activity stabilizes after three cycles over the Pt/Ga/Al₂O₃ catalyst.

关键词: Dehydrogenation, Ga₂O₃, Al₂O₃, Coordinatively unsaturated

Abstract: The effect of the Al₂O₃ structure on the performance of Pt/Ga/Al₂O₃ catalysts is investigated for the direct dehydrogenation of propane. The study unveils that the structure of Al³⁺ determines the bulk structure of catalysts, particularly a high content of coordinatively unsaturated Al³⁺ sites (penta-coordinated Al³⁺, denoted as Al³⁺_penta) could lead to a remarkably improved dehydrogenation activity of the catalyst. The bulk characterization reveals that the sufficient amount of Al³⁺_penta in Al₂O₃ benefit the dispersion of Pt and Ga₂O₃ on the Al₂O₃ support. At the same time, TPR results reveal that the presence of Pt facilitates the reduction of Ga₂O₃, likely due to the hydrogen spillover between the well dispersed Pt and Ga₂O₃, which consequently enhances the synergistic function between Pt and Ga₂O₃ in the dehydrogenation of propane. Recyclability tests demonstrate that the dehydrogenation activity stabilizes after three cycles over the Pt/Ga/Al₂O₃ catalyst.

Key words: Dehydrogenation, Ga₂O₃, Al₂O₃, Coordinatively unsaturated

Qinqin Yu, Tie Yu, Hongyu Chen, Guangzong Fang, Xiulian Pan, Xinhe Bao. The effect of Al³⁺ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al₂O₃ catalysts[J]. 能源化学(英文版), 2020, 41(2): 93-99.

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The effect of Al³⁺ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al₂O₃ catalysts

The effect of Al³⁺ coordination structure on the propane dehydrogenation activity of Pt/Ga/Al₂O₃ catalysts

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