ZnO_TiO_2复合催化剂上尿素与甲醇合成碳酸二甲酯.pdfVIP

化 学 工 程 师 Sum 174 No.3 Chemical Engineer 2010 年第3 期 文章编号：1002-1124 （2010）03-0024-04 科 研 与 ZnO - TiO2 复合催化剂上尿素与 开 发 甲醇合成碳酸二甲酯 郭效军，王爱平，魏彩虹，张 力，严 军 （西北师范大学化学化工学院，甘肃 兰州 730070） 摘要：考察了摩尔比不同、煅烧温度不同的ZnO- TiO2 复合催化剂对尿素醇解合成碳酸二甲酯的催化活 性。讨论了催化剂用量、反应时间、反应温度和原料配比等因素对合成碳酸二甲酯（DMC）收率的影响。实验结 果表明ZnO- TiO 复合催化剂上最佳反应条件为：催化剂用量为反应体系总质量的1 %，反应时间为4 h ，反应 2 温度为160℃，甲醇和尿素的摩尔比为14。碳酸二甲酯（DMC）的最高收率为19.2 %。 关键词：ZnO- TiO 复合催化剂；尿素醇解；碳酸二甲酯；催化活性 2 中图分类号：TQ225.24 文献标识码：A Synthesis of dimethyl carbonate from urea and methanol over ZnO-TiO2 composite catalyst GUO Xiao-jun，WANG Ai-ping ，WEI Cai-hong ，ZHANG Li ，YAN Jun （College of Chemistry and Chemical Engineering ，Northwest Normal University ，Lanzhou 730070 ，China） Abstract: The catalytic activities of a series of ZnO -TiO2 composite catalysts for alcoholysis of urea have been studied in different molar ratio and different calcining temperature. The effects of various operation condi － tions, such as amount of ZnO-TiO , reaction time, reaction temperature and the molar ratio of the reactants were 2 investigated in the terms of DMC yield. The experimental results indicated that the optimal reaction conditions were amount of ZnO -TiO2 of 1% , reaction time of 4h, reaction temperature of 160℃ , and the molar ratio of methanol/urea of 14, respectively. The DMC yield of 19.2% was obtained in the optimal reaction conditions.