焙烧温度对二氧化钛催化性能的影响  

Effect of calcining temperature on catalytic performance of TiO_2

作　　者：葛鑫[1,2] 李碧静[1,2] 胡静[1] 陈彤[1] 王公应[1] 胡徐腾[3] 

机构地区：[1]中国科学院成都有机化研究所,四川成都610041 [2]中国科学院研究生院,北京100049 [3]中国石油天然气股份有限公司石油化工研究院,北京100083

出　　处：《化学工程》2011年第11期61-65,共5页Chemical Engineering(China)

基　　金：中国科学院2007"西部之光"联合学者项目

摘　　要：采用水解与超声相结合的方法制备了催化剂二氧化钛,用于碳酸二甲酯与苯酚酯交换合成碳酸二苯酯的反应,并用XRD和FT-IR对催化剂进行了表征。焙烧温度在130℃时,二氧化钛以无定形态存在;200℃开始出现锐钛矿二氧化钛,随温度的升高,钛逐渐由四面体配位向八面体配位转变。活性随焙烧温度升高而降低,200℃时活性较好,苯酚转化率可达33.7%,未检测到副产物;温度为400℃催化剂几乎没有活性,表明晶相二氧化钛的形成不利于苯酚与碳酸二甲酯的酯交换。TiO2 catalyst was prepared by hydrolysis combined with ultrasonic and used in the synthesis of diphenyl carbonate by transesterification of dimethyl carbonate and phenol.The catalysts were characterized by X-ray diffraction and FT-IR spectroscopy.The result shows that amorphous TiO2 with tetrahedral symmetry exists over the catalyst calcined at 130 ℃;from 200 ℃,anatase TiO2 is detected and Ti symmetry gradually turns from tetrahedral symmetry to octahedral symmetry.The catalytic activity decreases with the increasing of calcined temperature,and the conversion of phenol and the transesterification selectivity over the TiO2 catalyst which was calcined at 200 ℃ are 33.7% and 99.9%,respectively.TiO2 calcined at 400 ℃ is essentially inactive for this reaction.The result indicates that anatase TiO2 is disadvantage of transesterification between phenol and dimethyl carbonate.

关 键 词：二氧化钛 碳酸二苯酯 碳酸二甲酯 酯交换 四面体配位 

分 类 号：O643.36[理学—物理化学]