稀土改性固体超强酸催化剂SO_4^(2-)/TiO_2-La_2O_3的制备及其催化性能  

PREPARATION AND CATALYTIC ACTIVITY OF SO_4^(2-)/TiO_2-La_2O_3

作　　者：杨水金[1] 黄永葵[1] 白爱民[1] 杨赟[1] 孙聚堂[2] 

机构地区：[1]湖北师范学院化学与环境工程学院污染物分析与资源化技术湖北省重点实验室,湖北黄石435002 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《北京工商大学学报（自然科学版）》2010年第3期38-43,共6页Journal of Beijing Technology and Business University:Natural Science Edition

基　　金：湖北省自然科学基金资助项目(2005ABA053);污染物分析与资源化技术湖北省重点实验室开放基金资助项目

摘　　要：制备了稀土改性固体超强酸SO24-/TiO2-La2O3环境友好催化剂,并以丁酸丁酯的合成作为探针反应,系统考察了原料摩尔比n(La3+)∶n(Ti4+)、硫酸浸渍时间、焙烧温度、活化时间等制备条件对SO24-/TiO2-La2O3催化活性的影响.实验表明:制备催化剂的适宜条件是原料摩尔比n(La3+)∶n(Ti4+)=1∶34,浸渍浓度为0.8 mol.L-1,浸渍时间为24 h,焙烧温度为480℃,活化时间3 h.利用优化条件下制备的催化剂SO24-/TiO2-La2O3催化合成缩醛(酮),在醛/酮与二元醇(乙二醇,1,2-丙二醇)的投料摩尔比为1∶1.5,催化剂的用量占反应物总投料质量的0.5%,反应时间为1 h条件下,10种缩醛(酮)的产率为41.4%～95.8%.SO42-/TiO2-La2O3,a novel solid superacid,was prepared and its catalytic activities at different synthetic conditions were analyzed with esterification of n-butanoic acid and n-butyl alcohol as probing reaction.The optimum conditions were as follow： mole ratio of n（La3＋）∶n（Ti4＋） of 1∶34,the soaked consistency of H2SO4 of 0.8 mol·L-1,the soaked time of H2SO4 of 24 h,the calcining temperature of 480 ℃,the calcining time of 3 h.The catalyzer prepared under the optimal conditions was applied in the catalytic synthesis of ten important ketals and acetals as catalyst and exhibited high catalytic activity.The yields of ketals and acetals can reach 41.4%～95.8% when the molar ratio of aldehyde/ketone to glycol is 1∶1.5,the mass ratio of the catalyst used in the reactants is 0.5%,and the reaction time is 1.0 h.

关 键 词：SO42-/TiO2-La2O3 稀土 固体超强酸 催化 

分 类 号：TQ655[化学工程—精细化工] TS202.3[轻工技术与工程—食品科学]