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Effect of Ti-promoting on propane dehydrogenation over porous Zn-based catalysts: A strategy to enhance activity and selectivity
Applied Surface Science  (IF6.707),  Pub Date : 2021-11-29, DOI: 10.1016/j.apsusc.2021.152067
Yingmin Qu, Ting Zhao, Huan Zhao, Zhongshen Zhang, Zhengping Hao

In this work, low-cost and environmentally friendly catalysts Ti-doped ZnAl2O4 spinel were prepared by a homogeneous co-precipitation method and employed to catalyze propane dehydrogenation. In situ FTIR revealed that Ti accelerated the conversion of zinc propyl species (intermediate species) to propene, which is rate-determining step for propane dehydrogenation over active site coordinatively unsaturated Zn (Zncus). Characterizations, such as H2-TPR, temperature programmed surface reaction (TPSR) and C3H6-TPD illustrated that Ti improved oxygen mobility resulting in the improved catalytic activity, and promoted desorption of propene leading to significant enhancements in propene selectivity and the stability of catalyst. Zn1.5Ti1Al2 exhibited an excellent catalytic performance due to the existence of more Zncus, at 43% C3H8 conversion, a 84% of C3H6 selectivity was obtained at 500 ° C. The deactivation of Ti-doped ZnAl2O4 spinel is due to the formation of coke rather than the reduction of Zn species. This work provided an effective strategy to improve the catalytic activity of Zn-based catalysts for propane dehydrogenation.