关键词:

V-MCM-41, 水热合成, 环己烯, 催化选择性氧化

Abstract:

V-MCM-41 mesoporous materials were synthesized by the hydrothermal method, and characterized by powder X-ray diffraction, ICP-AES, FTIR, diffuse reflectance UV-Vis and N₂ adsorption-desorption.The results showed that a part of vanadium ions were incorporated into the MCM-41 framework and all synthesized samples exhibited a high crystallinity that increased with increasing molar ratio of V/Si in the synthesis gels.The results of cyclohexene oxidation catalyzed by V-MCM-41 indicated that its catalytic activity decreased in cyclohexene selective oxidation when the V content was larger than 1.10% due to the presence of V-O-V species.And at the same time, acetonitrile was also found to be the best solvent for the V-MCM-41 catalyzed cyclohexene oxidation with H₂O₂, and the optimum reaction temperature was 70℃.The reaction results showed that cyclohexene conversion and H₂O₂ utilization could reach 23.91%(mol) and 95.4%(mol) under the optimum reaction conditions, respectively.

Key words:

V-MCM-41, 水热合成, 环己烯, 催化选择性氧化