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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 %。
Sodium polyoxyzirconium ion exchange Na Na bentonite hydrated sodium ion, and then introduced SO2 4 as a promoter for modification, prepared SO2 4 modified zirconium crosslinked clay solid acid catalyst SO2 4 / Zr-CLC, citric acid and positive Butanol esterification reaction as a probe, investigated the catalyst preparation conditions on its catalytic activity. The experimental results show that when the content of Zr4 + / clay in Zr4 + is 3mmol / g, the initial concentration of Zr4 + is 0 5mol / L, the content of SO2 4 in SO2 4 / clay is 30%, and the calcination at 500 ℃ for 2h Of the catalyst has good catalytic activity, enabling citric acid conversion rate of 96 6 0%.