Citation: Chong Chen, Minglei Sun, Zhongpan Hu, Yuping Liu, Shoumin Zhang, Zhong-Yong Yuan. Nature of active phase of VO_x catalysts supported on SiBeta for direct dehydrogenation of propane to propylene[J]. Chinese Journal of Catalysis, ;2020, 41(2): 276-285. doi: S1872-2067(19)63444-3 shu

Nature of active phase of VO_x catalysts supported on SiBeta for direct dehydrogenation of propane to propylene

a National Institute for Advanced Materials, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China;
b Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin 300071, China

Received Date: 26 May 2019
Revised Date: 9 July 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21421001, 21573115), the 111 project (B12015), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2017-K13).

The VO_x catalysts supported on dealuminated Beta zeolite (SiBeta) with varying V loadings (from 0.5 to 10 wt%) are prepared and tested for their catalytic activities in the reaction of direct dehydrogenation of propane to propylene (PDH). It is characterized that the VSiBeta catalysts possess different kinds of vanadium species on the SiBeta support, including monomeric or isolated VO_x species at a low V loading, and polynuclear VO_x species in different polymerization degrees at higher V loadings. The 3VSiBeta catalyst (V loading is 3 wt%), containing isolated VO_x species in monolayer, shows around 40% of propane conversion with 90% of propylene selectivity (reaction conditions:600 ℃, 4000 mL g^-1 h^-1) which are comparable to VSiBeta catalysts with higher V loadings. The catalytic activity exhibits a good linear relationship with the amount of generated acidic sites, which are derived from the interaction sites between VO_x species and SiBeta support, and keeps stable after several regeneration cycles. Thus, as the VO_x species directly contact with SiBeta support via V-O-Si bonds, a reactivity enhancement can be achieved. While, the initial valence state of V does not seem to influence the catalytic performance. Moreover, the aggregation degree of VO_x species determines the propylene selectivity and deactivation rate, both of which increase as raising the V loading amount.
- Propane dehydrogenation,
- Propylene,
- VO_x species,
- SiBeta support,
- Active sites
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Nature of active phase of VOx catalysts supported on SiBeta for direct dehydrogenation of propane to propylene

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通讯作者: 陈斌, bchen63@163.com

Nature of active phase of VO_x catalysts supported on SiBeta for direct dehydrogenation of propane to propylene