SO_4^(2-)改性锆交联粘土固体酸合成条件的研究  

Study on synthetic conditions of zirconium cross-linking clay solid acid modified by SO_4^(2-)

作　　者：林绮纯[1] 郭锡坤[1] 付丽华[1] 黄业权 林维明[2] 

机构地区：[1]汕头大学化学系,汕头515063 [2]华南理工大学化工系,广州510641

出　　处：《天然气化工—C1化学与化工》2002年第2期12-15,共4页Natural Gas Chemical Industry

基　　金：广东省教育厅自然科学研究项目 ;汕头市重点科技计划项目;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SO2 4作促进剂进行改性 ,制备了SO2 4改性锆交联粘土固体酸催化剂SO2 4/Zr -CLC ,以柠檬酸和正丁醇酯化反应为探针 ,考察了催化剂的制备条件对其催化活性的影响。实验结果表明 ,当Zr4+ /clay中的Zr4+ 含量为 3mmol/ g ,Zr4+ 溶液初浓度为 0 5mol/L ,SO2 4/clay的SO2 4质量分数为 30 % ,5 0 0℃焙烧 2h时所制得的催化剂具有较好的催化活性 ,能使柠檬酸的转化率达 96 6 0 %。Zirconium cross linking clay,prepared by cation exchange of Na bentonites with polyhydroxyl zirconium ion and modified by SO 2 4,was used as solid acid catalyst.The activity of the catalyst was measured in the esterification of citric acid with n butanol.The influence of different synthetic conditions on catalytic activity of the catalysts was also studied.The results showed that the catalytic activity was so satisfactory that the conversion of citric acid was up to 96 60% when the catalyst was synthisised at optimum conditions,that is,Zr 4+ in Zr 4+ /clay is 3mmol/g,initial Zr 4+ concentration in solution is 0 5mol/L,SO 2 4 content in SO 2 4/clay is 30wt% and the calcination temperautre is 500℃.

关 键 词：改性 锆交联粘土 固体酸 催化活性 酯化 硫酸 催化剂 合成 柠檬酸三丁酯 

分 类 号：O623.624.2[理学—有机化学] O643.36[理学—化学]