Ordered macroporous boron phosphate crystals as metal-free catalysts for the oxidative dehydrogenation of propane

doi:10.1016/S1872-2067(20)63654-3

Abstract

Abstract: Ordered macroporous materials with rapid mass transport and enhanced active site accessibility are essential for achieving improved catalytic activity. In this study, boron phosphate crystals with a three-dimensionally interconnected ordered macroporous structure and a robust framework were fabricated and used as stable and selective catalysts in the oxidative dehydrogenation (ODH) of propane. Due to the improved mass diffusion and higher number of exposed active sites in the ordered macroporous structure, the catalyst exhibited a remarkable olefin productivity of ~16 g_olefin g_cat^-1 h^-1, which is up to 2-100 times higher than that of ODH catalysts reported to date. The selectivity for olefins was 91.5% (propene: 82.5%, ethene:9.0%) at 515 ℃, with a propane conversion of 14.3%. At the same time, the selectivity for the unwanted deep-oxidized CO₂ product remained less than 1.0%. The tri-coordinated surface boron species were identified as the active catalytic sites for the ODH of propane. This study provides a route for preparing a new type of metal-free catalyst with stable structure against oxidation and remarkable catalytic activity, which may represent a potential candidate to promote the industrialization of the ODH process.

Key words: Ordered macroporous material, Metal-free catalyst, Boron phosphate, Oxidative dehydrogenation, Propane

Wen-Duo Lu, Xin-Qian Gao, Quan-Gao Wang, Wen-Cui Li, Zhen-Chao Zhao, Dong-Qi Wang, An-Hui Lu. Ordered macroporous boron phosphate crystals as metal-free catalysts for the oxidative dehydrogenation of propane[J]. Chinese Journal of Catalysis, 2020, 41(12): 1837-1845.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63654-3

https://www.cjcatal.com/EN/Y2020/V41/I12/1837

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