中文摘要：

制备一系列硅胶（SiO2）负载的磷钨酸铯盐催化剂，将其用于香兰素与1，2-丙二醇的缩合反应，合成香兰素丙二醇缩醛，考察催化剂中Cs^＋取代数、磷钨酸铯盐负载量、催化剂用量、1，2-丙二醇与香兰素摩尔比及反应时间对缩合反应的影响．结果表明：磷钨酸铯盐的Cs^＋取代数为2．5、负载量为40％时催化剂活性最高；在反应温度368K、n（1，2-丙二醇）／n（香兰素）=2．4、催化剂用量占反应体系质量分数1．5％、带水剂苯的用量30mL、回流反应3h的条件下，香兰素的转化率达到86．6％，香兰素丙二醇缩醛的选择性为100％．

英文摘要：

A series of cesium phosphotungstate catalysts supported on silica gel （ SiO2 ） were prepared and used to catalyze the condensation reaction of vanillin with 1,2-propanediol into vanillin propylene glycol acetal. Effects of substituted number of Cs^＋ , loading of cesium phosphotungstate, catalyst amount, mole ratio of 1,2-propanediol to vanillin, and reaction time on the reactivity were investigated. Results showed that the catalyst with Cs ^＋ substituted number of 2.5, and Cs salt loading of 40% exhibited the highest activity. Under optimal reaction conditions, i. e. , reaction temperature 368 K, mole ratio of 1,2-pro- panediol to vanillin 2.4, catalyst mass fraction in reaction medium 1.5 % , 30 mL benzene as water removal additive, and reaction time 3 h, the conversion of vanillin was 86.6% and the selectivity for vanillin propylene glycol aeetal was 100%.