摘要
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.
Molybdenum trioxide catalyst for the transesterification of phenyl acetate （PA） and dimethyl carbonate （DMC） to diphenyl carbonate （DPC） was prepared by a calcining method. The structure and catalytic properties of the catalyst synthesized at different temperatures were characterized by N2 absorption -desorption（ BET）, X - ray diffraction（XRD）, scanning electron microscopy （SEM）. The results showed that, the catalyst bad an orthorhombic structure, with the increase of calcination temperature, the specific surface area of the catalyst was decreased, the diffraction intensity of the （110） and （021） faces decreased, and the diffraction intensity of the （020）, （040）, and （060） faces increased, and the face （021） and/or （110） are/is favorable to the transesterification of DMC and PA to DPC. And too high calcination temperature would deteriorate the structure and catalyst activity. Furthermore, a plausible mechanism for the transesterification of DMC and PA to DPC catalyzed by MoO3 was proposed by changing the feeding order of the materials and catalyst.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2011年第6期520-526,共7页
Journal of Molecular Catalysis(China)
基金
国家"十一五"科技支撑计划(2006BAE02B03)资助项目
江苏省常州市工业科技攻关计划(CE2008091)资助项目
重庆市教育委员会科学技术研究项目(KJ110815)
重庆理工大学科研启动基金项目(2010ZD29)
关键词
焙烧温度
MOO3
碳酸二甲酯
乙酸苯酯
碳酸二苯酯
机理
calcination temperature
molybdenum trioxide
dimethyl carbonate
phenyl acetate
diphenyl carbonate
mechanism
