采用沉淀法制备CeO₂催化剂，考察了KOH溶液浓度、硝酸铈溶液浓度、焙烧温度等制备条件对催化甲醇与CO₂直接合成碳酸二甲酯（DMC）反应性能的影响，并利用XRD和SEM表征分析了催化剂的晶核和粒径。实验结果表明，在KOH溶液浓度为6 mol/L、硝酸铈溶液浓度为0.360 mol/L、焙烧温度为700℃时，CeO₂催化活性最高；通过正交试验得出，3种因素的影响顺序为：硝酸铈溶液浓度>焙烧温度>KOH溶液浓度。

CeO₂ catalysts are prepared by precipitation method.The effects of prepared conditions of the catalysts on their performances in catalyzing synthesis of dimethyl carbonate from methanol and carbon dioxide are investigated,including the concentrations of KOH solution and cerium nitrate solution,and calcination temperature.The crystal nucleus and particle size of the catalysts are characterized by XRD and SEM.Experimental results show that the highest catalytic activity can be gained by the CeO₂ catalyst that is prepared under the following conditions:the concentration of KOH solution is 6 mol·L^-1,the concentration of cerium nitrate solution is 0.36 mol·L^-1,and the calcination temperature is at 700℃.It is concluded from the orthogonal test that cerium nitrate solution concentration has the biggest influence,followed by calcination temperature and KOH solution concentration.

卢惠(1992-),女,硕士研究生,研究方向为工业催化,1741077168@qq.com