Citation:
Zai-Fang Han, Xu-Liang Xue, Jian-Min Wu, Wan-Zhong Lang, Ya-Jun Guo. Preparation and catalytic properties of mesoporous nV-MCM-41 for propane oxidative dehydrogenation in the presence of CO2[J]. Chinese Journal of Catalysis,
;2018, 39(6): 1099-1109.
doi:
10.1016/S1872-2067(18)63048-7
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The nV-MCM-41 catalysts were prepared by one-step hydrothermal synthesis and applied to the oxidative dehydrogenation of propane (ODHP) in the presence of CO2. Several state-of-the-art characterization methods were performed to explore the correlation between catalytic performance and the physicochemical characterizations of the catalysts. Because moderate amounts of V species were introduced into the framework of MCM-41, the catalyst maintained a large specific surface area, a highly ordered mesoporous structure, and highly dispersed V active sites (monomeric and dimeric V oxide species), while the high-vanadium-doping catalysts caused an enhancement in the number of acidic sites and V2O5 crystallites. The ODHP reaction showed that the 6.8V-MCM-41 (V content 6.8 wt%) catalyst exhibits high activity and stability, and the C3H8/CO2 molar ratio (1:4) was suitable. The promoting effect of CO2on the oxidative dehydrogenation of ODHP was demonstrated as the reaction coupling mechanism and "lattice oxygen" mechanism.
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