Abstract
La/ZrO2 catalysts were prepared by co-precipitation method. The physical and chemical properties of the catalysts were characterized by N2 adsorption–desorption method, X-ray diffraction and temperature programmed desorption. The selective conversions of ethanol to propylene over these synthesized La/ZrO2 catalysts were also investigated. The optimum propylene yield reached 42.3% over La(1)/ZrO2 catalyst. A coordination of redox and acid–base properties accounts for the remarkable improvement of reaction performance over La/ZrO2 catalysts. On the basis of calculation results, the introduction of oxygen vacancy or La results in significant charge transfer. The Lewis acid–base (Zr–O) pair sites become more active as a result of charge transfer over La/ZrO2 catalysts. Furthermore, the formation of O vacancies over La/ZrO2 (101) is easier than that over t-ZrO2(101). Therefore, La modification improves the performance of ZrO2 on conversion of ethanol to propylene.
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Acknowledgements
This work is a project sponsored by the National Natural Science Foundation of China (Grant 21406269), Shandong Provincial Natural Science Foundation, China (Grant ZR2014BQ012), Scientific Research Foundation for Returned Scholars, Ministry of Education of China (K1504051C), Shandong Provincial Key Research Program (Grant: 2015GSF121017), the Fundamental Research Funds for the Central Universities (19CX02037A, 17CX05016), the International Cooperation and Exchange Funds, China University of Petroleum (East China) (UPCIEF2019005), and the PetroChina Innovation Foundation (2017D-5007-0506).
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Xia, W., Wang, F., Wang, L. et al. Highly Selective Lanthanum-Modified Zirconia Catalyst for the Conversion of Ethanol to Propylene: A Combined Experimental and Simulation Study. Catal Lett 150, 150–158 (2020). https://doi.org/10.1007/s10562-019-02916-2
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DOI: https://doi.org/10.1007/s10562-019-02916-2