Synthesis of Mo-HMS and Its Catalytic Performance in Liquid Epoxidation of Propylene

doi:10.3724/SP.J.1088.2012.11031

Abstract

Abstract: Mo-HMS was synthesized by a one-step hydrothermal method. Its structure and surface molybdenum species were characterized by X-ray diffraction, N₂ adsorption-desorption, transmission electron microscopy, laser-Raman spectroscopy, and UV-Vis spectroscopy. The results show that introducing molybdenum species into HMS does not destroy the structure of HMS zeolite. There are three molybdenum species such as the isolated molybdenum species, polymolybdate species, and little crystalline MoO₃ existing in the HMS support. Compared with impregnated MoO₃/HMS and sol-gel MoO₃/SiO₂, the one-step method can lead to the decrease of crystalline MoO₃ content by 39% and 61%, respectively. In the epoxidation of propylene with cumene hydroperoxide, the catalytic performance of Mo-HMS is better than that of MoO₃/HMS and MoO₃/SiO₂, which is due to the higher dispersion of molybdenum species in Mo-HMS.

Key words: molybdenum, HMS zeolite, propylene, epoxidation, cumene hydroperoxide

MIAO Yong-Xia, YANG Xin-Li, GUO Li-Hong. Synthesis of Mo-HMS and Its Catalytic Performance in Liquid Epoxidation of Propylene[J]. Chinese Journal of Catalysis, 2012, 33(4): 711-716.

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