氧化锌催化剂在碳酸二甲酯合成中的应用研究

Synthesis of Dimethyl Carbonate via Zinc Oxide Catalyst

用低热固相配位化学反应方法、分析纯ZnO表面改性、均相沉淀法、溶胶-凝胶法、并流沉淀法和固体研磨法6种方法制备了ZnO催化剂。对这6种ZnO催化剂进行了XRD和SEM表征,筛选出最好的催化剂;比较了它们对DMC合成的活性大小的影响。结果表明:在尿素3g,甲醇120mL,催化剂占整个反应物质量的6%,反应温度170～180℃,压力2.0～2.4MPa,时间8h条件下,ZnO(D)的催化活性最高,DMC的收率达到6.10%,尿素转化率为77.83%;用不同方法制备得到的ZnO催化活性顺序为ZnO(D)>ZnO(F)>ZnO(C)>ZnO(A)>ZnO(B)>ZnO(E)。

6 Methods of low heat solid phase coordination,chemical reaction,analytic purity ZnO surface modification,homogeneous precipitation,sol-gel,co-precipitation and solid milling are used to prepare ZnO catalysts.6 ZnO catalysts are characterized by XRD and SEM to select the best catalyst;their effect on the activity of DMC synthesis is compared.The results show that under the conditions of urea 3 g,methanol 120 mL,catalyst accounting for 6% of the reactant mass,reaction temperature 170～180 ℃,pressure 2.0～2.4 M...