分子筛MCM-48负载硅钨酸催化合成苯甲醛1，2-丙二醇缩醛

以分子筛MCM-48负载硅钨酸H4SiW122o40／MCM-48为催化剂，通过苯甲醛和1，2-丙二醇反应合成了苯甲醛1，2-丙二醇缩醛。通过正交实验优选反应条件，结果表明，在苯甲醛与1，2-丙二醇摩尔比1：1．4，催化剂用量为反应物料总质量的0．5％，环己烷为带水剂，其用量8mL反应时间30min的优化条件下，苯甲醛1，2-丙二醇缩醛的收率可达64．63％，并用H4SiW122o40／MCM-48催化剂与SnO及H3PW12O40两种催化剂作催化活性比较，结果表明，H4SiW122o40／MCM-48催化剂的催化活性明显高于其他两种催化剂，并具有反应时间短、操作简便、产品收率高及无毒、无公害等优点。

Catalytic Synthesis of Benzaldehyde 1,2-Propanediol acetal by H4 SiW12O40/MCM-48

Benzaldehyde 1,2 - propanediol acetal was synthesized from benzaldehyde and 1,2 - propanediol in the presence of H4SiW12O40/MCM-48. The optimum conditions were found out by the orthogonal experiments. Experimental result showed that yield of benzaldehyde 1,2 - propanediol acetal could reach 64.63 % under the reaction conditions as follows： molar ratio of 1,2 -propanediol to benzaldehyde 1.4： 1, the quantity of catalyst equal to 0.5% of feed stocks, cyclohexane as agent, and the reaction time 30 minutes. Comparison of catalytic activity of SnO, H3PW12O40 and H4SiW12O40/MCM -48 catalysts was made. The catalyst possesses a fairly high catalytic activity for the acetalation reaction, and has the short reaction time, less catalyst dosage and obtain high yield with simple operation, environmentally friendly.