Effect of Coking and Propylene Adsorption on Enhanced Stability for Co²⁺-Catalyzed Propane Dehydrogenation

Yihu Dai*^,a, Yue Wu^a, Hua Dai^a, Xing Gao^a, Suyang Tian^a, Jingjing Gu^a, Xianfeng Yi^b, Anmin Zheng^b, Yanhui Yang*^,a

^aInstitute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China

^bState Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China

Abstract:

The effects of Si-additive modification on nonoxidative propane dehydrogenation (PDH) over γ-Al₂O₃ sheet-supported isolate Co²⁺ catalysts have been investigated. Si addition introduces a number of moderate-strength acid sites by the formation of composite SiAl oxides. Promoted catalytic stability is achieved on Si-modified Si-Co-Al₂O₃ in comparison with the Si-free Co-Al₂O₃ catalyst. A relatively lower graphitization degree and a higher ratio of highly reactive coke species are observed on the Si-Co-Al₂O₃ catalyst. The co-feeding of C₃H₆ significantly changes the coking reaction rates but not the coke distributions on Co-based catalysts. The interaction of C₃H₆ with Co catalysts can be affected by Si modification tuning the coking property and the catalytic stability of Co²⁺-Al₂O₃-based catalysts for the PDH reactions.

J. Catal. 2021, 395, 105-16.（影响因子：7.888）

论文链接： https://doi.org/10.1016/j.jcat.2020.12.021