ZnO-TiO_2复合催化剂上尿素与甲醇合成碳酸二甲酯

Synthesis of dimethyl carbonate from urea and methanol over ZnO-TiO_2 composite catalyst

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-TiO2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%。

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 conditions, such as amount of ZnO-TiO2, reaction time, reaction temperature and the molar ratio of the reactants were 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.