焙烧温度对SO_4^(2-)改性锆交联粘土固体酸结构与催化活性的影响  

Influence of Calcinating Temperature on Structure and Catalytic Activity of Zirconium Cross-linking Clay Solid Acid Modified by SO_4^(2-)

作　　者：郭锡坤[1] 林绮纯[1] 付丽华[1] 邓湘华[1] 

机构地区：[1]汕头大学化学系,广东汕头515063

出　　处：《分子催化》2002年第4期263-266,共4页Journal of Molecular Catalysis(China)

基　　金：广东省教育厅自然科学研究项目;汕头大学研究与发展基金项目;汕头大学工业催化"2 11工程"建设项目资助

摘　　要：用聚羟基锆离子交换 Na基膨润土中的水合钠离子 ,再引入 SO4 2 - ,在不同温度焙烧制备了锆交联粘土固体酸催化剂 ,利用 XRD、IR、DTA等手段 ,对该催化剂的结构进行了分析测试 ,并以柠檬酸和正丁醇酯化反应为探针 ,考察了焙烧温度对其结构与催化活性的影响 .实验结果表明 ,焙烧温度为 5 0 0℃时 ,SO4 2 - 与锆氧化柱形成了具有超强酸性的结构 ,催化剂活性较佳 ,能使柠檬酸酯化反应转化率达 96 .6 % ,反应酯化率达 95 .72 % .Zirconium cross\|linking clay prepared by cation exchange of Na\|Bentonites with polyhydroxyl Zirconium ion and modified by SO 4 2- has been used as solid acid catalyst. The activity of the catalyst was measured for the esterification of citric acid with n \|butanol. The structure of the catalyst was characterized by means of XRD, IR and DTA. The influence of different calcinating temperatures on structure and catalytic activity of the catalyst was studied. The results showed that superacid structure was formed at the calcinating temperature of 500 ℃. The conversion of citric acid was higher than 96.6%, and the ester yield was up to \{95.72%.\}

关 键 词：焙烧温度 结构 催化活性 锆交联粘土 固体酸催化剂 酯化 柠檬酸 正丁醇酯 

分 类 号：O643.36[理学—物理化学] O621.256.4[理学—化学]