SO_4^(2-)酸化柱撑蒙脱石催化合成甲基丙烯酸甲酯

Catalytic Synthesis of Methyl Methacrylate by SO_4^(2-) Acid Pillared Montmorillonite

采用离子交换法合成铝柱撑蒙脱石(Al-PILM)和铝铁柱撑蒙脱石(Fe-Al-PILM),经过SO42-酸化,制备为固体酸催化剂,催化合成甲基丙烯酸甲酯。采用XRD、FT-IR、BET等手段对蒙脱石、Al-PILM和Al-Fe-PILM进行表征,并考察反应条件对酯化反应的影响。确定最佳反应条件为反应温度190℃,反应时间120min,催化剂用量为11%,n(甲基丙烯酸):n(甲醇)为1∶2.0。此条件下,2种催化剂催化甲基丙烯酸转化率分别为84.2%、83.6%。

AI pillared montmorillonite （AI-PILM） and A1 Fe pillared montmorillonite （A1-Fe-PILM） was synthetized by ion exchange. Solid acid catalyst was prepared with the product after SO42- acidification. Methyl methacrylate was synthetized catalyzed by the prepared solid acid catalyst. Montmorillonite, A1-PILM and A1-Fe-PILM was characterized by means of XRD, FT-IR, TG/ DSC, the effects of reaction conditions on esterification reaction were investigated. The optimum reaction conditions were： reaction temperature 190℃, reaction time 120min, amount of catalyst was 11%, n （methacrylic acid）：n （methanol） was 1 ： 2.0. Under these conditions, the methacrylic acid yield of these two kinds of catalyst was 84.2%, 83.6%, respectively.