文献类型：期刊文献

英文题名：Different alkali metals promoted Cr/Al2O3 catalysts for propane dehydrogenation

作者：Fu, Haoyue[1];Qian, Weixin[1];Zhang, Haitao[1];Ma, Hongfang[1];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Sch Chem Engn, State Key Lab Chem Engn,Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：342

外文期刊名：FUEL

收录：;EI(收录号：20230713593256);WOS:【SCI-EXPANDED(收录号:WOS:000939545300001)】；

基金：Acknowledgments We gratefully acknowledge the financial support from the Funda-mental Research Funds for the Central Universities (No. JKA01221712) .

语种：英文

外文关键词：Propane dehydrogenation; Propylene; Cr -based catalyst; Alkali metal

摘要：Unmodified Cr/Al2O3 and Cr/Al2O3 doping with different alkali metals (Li, Na, K) were prepared by the incipient wetness impregnation method. The surface elements of all the catalysts are evenly distributed and well loaded, and the addition of alkali metals does not change the crystal structure and surface texture. Both Cr6+ and Cr3+ species exist on all catalysts, and the addition of alkali metals can increase the amount of Cr6+ species, and Cr6+ species are basically converted into active Cr3+ species in the reaction thus increasing the initial propane conversion in the reaction. The addition of alkali metals reduced the amount of total acid sites and the strong acid sites of the catalyst, thus inhibiting the occurrence of side reactions and the formation of carbon deposition, and reducing the deactivation rate of the catalyst. Cr-0.5Na/Al2O3 exhibited the best catalytic performance and the lowest carbon deposition.