摘要
采用焙烧法制备了MoO3催化剂并将其用于碳酸二甲酯(DMC)与乙酸苯酯(PA)合成碳酸二苯酯(DPC)反应,考察了焙烧温度对催化剂性能的影响,并用X射线衍射(XRD)对催化剂结构进行了表征.结果发现,在400或500oC焙烧的催化剂具有良好的催化性能,DMC转化率为73.9%,DPC和甲基苯基碳酸酯的选择性分别为39.5%和56.5%.XRD结果表明,该催化剂物相组成为正交晶系MoO3,且(021)或/和(110)晶面有利于酯交换反应.催化剂使用5次后DMC转化率从73.9%降至10.2%,多次重复使用后的催化剂在空气气氛中于400或500oC焙烧即可再生,再生后催化剂的性能几乎和新鲜催化剂相当.
A molybdenum trioxide catalyst for the transesterification of dimethyl carbonate （DMC） and phenyl acetate （PA） to diphenyl carbonate （DPC） was prepared by the calcination method. The effect of calcination temperature and recycling of the catalyst were investigated. The catalyst prepared at 400 or 500 oC showed the highest activity, with a DMC conversion of 73.9%, and the selectivity for DPC and MPC was 39.5% and 56.5%, respectively. The catalyst activity fell and the conversion of DMC was reduced from 73.9% to 10.2% after five recycles. X-ray diffraction showed that the catalyst had an orthorhombic structure and the （110） or/and （021） face（s） is/are the most active for the transesterification of DMC and PA. The used catalyst can be easily regenerated by calcination at 400 or 500 ℃ in air for 5 h, and the catalytic activity of the regenerated catalyst was almost as high as the fresh one.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第9期853-855,共3页
基金
国家"十一五"科技支撑计划(2006BAE02B03)
江苏省常州市工业科技攻关计划(CE2008091)
关键词
三氧化钼
酯交换
碳酸二甲酯
乙酸苯酯
碳酸二苯酯
molybdenum trioxide
transesterification
dimethyl carbonate
phenyl acetate
diphenyl carbonate
