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用焙烧法制备了碳酸二甲酯(DMC)与乙酸苯酯(PA)酯交换合成碳酸二苯酯(DPC)反应的正交晶系MoO3催化剂,并用N2吸附-脱附法(BET)、X射线衍射(XRD)、扫描电镜(SEM)等表征手段,考察了焙烧温度对催化剂结构和催化性能的影响.结果表明,随着焙烧温度的升高,催化剂的比表面积逐渐减小,正交晶系MoO3的(110)、(021)晶面强度逐渐减弱,(020)、(040)、(060)晶面强度增强,(021)和/或(110)晶面有利于酯交换反应.过高的焙烧温度,使得正交晶系MoO3晶体结构发生变化,催化剂活性降低.另外,本文通过改变物料投加顺序,就MoO3催化DMC和PA合成DPC反应机理进行了探索.
The orthorhombic MoO3 catalysts were prepared by the calcination method of transesterification of dimethyl carbonate (DMC) with phenyl acetate (PA) to synthesize diphenyl carbonate (DPC). The molar ratio of Ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of calcination temperature on the structure and catalytic performance of the catalyst were investigated. The results showed that the specific surface area of the catalyst decreased with the increase of calcination temperature. The strength of (110), (021) and (060) planes of MoO3 gradually decrease, and the intensities of (020), (040) and (060) planes increase and the (021) and / or (110) planes favor the transesterification. High temperature and high calcination temperature, the crystal structure of orthorhombic MoO3 changed, and the activity of catalyst decreased.Furthermore, this paper explored the synthesis of DPC reaction mechanism by DMC and PA by changing the order of material addition.