负载型碘化钾催化合成甘油碳酸酯  

Research on Synthesis of Glycerol Carbonate Catalyzed by Supported KI

作　　者：王富丽 黄世勇 余青云[2] 黄媚 孙果宋 

机构地区：[1]广西壮族自治区化工研究院,广西南宁530006 [2]广西大学化学化工学院,广西南宁530004

出　　处：《精细化工》2014年第11期1337-1341,共5页Fine Chemicals

基　　金：广西自然科学基金项目(2011GXNSFA018053)~~

摘　　要：采用浸渍法制备了负载型碘化钾催化剂,并通过二氧化碳、环氧丙烷和甘油合成甘油碳酸酯反应评价其催化活性,发现KI/γ-Al2O3具有最高的活性,甘油的转化率为58.5%,甘油碳酸酯的产率为54.6%。其中,不同比表面积的γ-Al2O3载体对于活性组分负载量具有一定的影响,通过BET、XRD法对催化剂进行了表征,进一步说明了大比表面积的γ-Al2O3载体有利于KI高度分散。实验考察了反应温度、反应物摩尔比、KI负载量对反应结果的影响,得到最佳实验参数为:反应温度130℃,环氧丙烷与甘油的摩尔比3∶1,KI负载量1.5 mmol/g。催化剂KI/γ-Al2O3经过5次使用后,甘油碳酸酯的产率仍在50%以上,具有较好的稳定性。The ordered mesoporous materials V/SBA-15 was prepared by hydro-thermal method under the acidic conditions using P123（tri-block copolymer） as template, tetraethoxysilane（TEOS） as silicon source, citric acid vanadyl complexes as precursors. The influence factors of preparation mesoporous molecular sieves V/SBA-15 including the different crystallization time and the dosage of template agent were systematically investigated. The experimental results showed that under the optimum condition such as the crystallization time 96h and dosage of template agent n=1.0, V/SBA-15 remains a highly ordered two-dimensional hexagonal pore structure of SBA-15, and the load of active ingredient metal vanadium oxide uniformly distributed on the surface of mesoporous. The structure of V/SBA-15 was characterized by the XRD, BET, FT-IR, meanwhile, the catalytic performances were verified by the selectivity and yield of acetophenone in the oxidation of ethyl-benzene to acetophenone reaction. The results displayed under the optimum condition of catalyzation oxidation ethyl-benzene to acetophenone, the selectivity and yield of acetophenone are 82.65% and 38.96%, respectively.

关 键 词：碘化钾 负载 甘油 二氧化碳 甘油碳酸酯 催化与分离提纯技术 

分 类 号：TQ426.94[化学工程]