Abstract
The production of propylene via a gas-phase metathesis of ethylene and 2-pentene has been studied over the Re2O7/SiO2–xAl2O catalysts containing various SiO2–Al2O3 compositions (13, 25, 50, 75, and 100 wt% Al2O3). Using ethylene and 2-pentene as the reactants, isomerization of the initial 1-butene product into 2-butenes and a subsequent secondary metathesis reaction between 2-butenes and excess ethylene enhanced the propylene formation so that propylene yield higher than its stoichiometric amount (>50 %) could be obtained. While the pure Al2O3 supported Re2O7 catalyst possessed only the first type of isolated monomeric ReO4 − tetrahedra structure with a stronger Re–O-support bond, the second type with a weaker Re–O-support bond was observed on the SiO2–Al2O3 supported ones. The double-bond isomerization and the metathesis activities were optimized to produce the highest propylene yield over the Re2O7/SiO2–Al2O3 catalyst containing 50 wt% Al2O3.
Graphical Abstract
While the pure Al2O3 supported Re2O7 catalyst possessed only the first type of isolated monomeric ReO4 − tetrahedra structure with a stronger Re–O-support bond, the second type with a weaker Re–O-support bond was observed on the Re2O7/SiO2–Al2O3 catalysts and suggested to be the double-bond isomerization active sites. The isomerization of the initial 1-butene product into 2-butenes and a subsequent secondary metathesis reaction between these 2-butenes and excess ethylene resulted in the higher propylene yield. The optimum amount of alumina for the highest propylene yield was 50 wt%.
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Acknowledgments
The financial supports from the Thailand Research Fund (TRF), the Office of Higher Education Commission (CHE), and the CU-NRU (AM1088A) are gratefully acknowledged. The authors would like to thank the Royal Golden Jubilee Ph.D. scholarship from TRF and SCG chemicals Co., Ltd for W.P.
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Phongsawat, W., Netiworaruksa, B., Suriye, K. et al. Effect of SiO2–Al2O3 Composition on the Catalytic Performance of the Re2O7/SiO2–Al2O3 Catalysts in the Metathesis of Ethylene and 2-Pentene for Propylene Production. Catal Lett 142, 1141–1149 (2012). https://doi.org/10.1007/s10562-012-0879-0
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DOI: https://doi.org/10.1007/s10562-012-0879-0