Zhou, Hang; Qi, Guodong; Chu, Yueying; Wang, Liang; Hui, Yu; Yao, Zhangyi; Wang, Feng Ryan; ... Xiao, Feng-Shou; + view all Zhou, Hang; Qi, Guodong; Chu, Yueying; Wang, Liang; Hui, Yu; Yao, Zhangyi; Wang, Feng Ryan; Chu, Shengqi; Qin, Yucai; Song, Lijuan; Liu, Lu; Qin, Xuedi; Xu, Jun; Deng, Feng; Xiao, Feng-Shou; - view fewer (2025) Ultralow Content of Chromium Species in Zeolite for Efficient Catalytic Propane Dehydrogenation. Journal of the American Chemical Society , 147 (36) pp. 32432-32439. 10.1021/jacs.5c04531.

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Abstract

Supported chromia catalysts have been commercially used in propane dehydrogenation, which relies on Cr loading at weight fractions of up to 20 wt %. This leads to problems in managing spent catalysts with a high content of toxic chromium species. These catalysts also rapidly deactivate within 10–15 min, requiring frequent regeneration in each cycle. To overcome these problems, we developed a siliceous MFI zeolite with an ultralow Cr content (e.g., 0.09 wt %) that exhibits high activity and durability for propane dehydrogenation. A mechanism study revealed that the chromic hydroxyl species readily dissociated the C–H bonds, accelerating the rapid desorption of propylene products and resulting in a slow deactivation rate. Therefore, the catalyst lifetime can be prolonged to more than 30 days under mild operating conditions (525 °C).

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