负载型碘化钾催化合成甘油碳酸酯的研究

Research on Synthesis of Glycerol Carbonate Catalyzed by Supported KI

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等方法对催化剂进行了表征，进一步说明了大比表面的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，得到了最佳的实验参数。同时，通过重复性使用实验，表明催化剂KI/γ-Al2O3具有较好的稳定性。

Abstract:

The catalysts of supported potassium iodide were produced using dip method. The catalytic activity were evaluated by the reaction of carbon dioxide, propylene epoxide and glycerol to synthesize glycerol carbonate and KI/γ-Al2O3 was found to be the best one, where the conversion of glycerol was 58.5% and the yield of glycerol carbonate was 54.6%. Different specific surface area of γ-Al2O3 had some effect on KI loading of active component. KI/γ-Al2O3 catalysts were characterized by BET and XRD, which showed that γ-Al2O3 supporter with high specific surface was beneficial to dispersion of KI. At the same time, the effects of reaction temperature, molar ratio of reactants and KI loading on the reaction were investigated and the optimal experimental parameters were obtained. Through repeated using tests, the result showed that the catalysts of KI/γ-Al2O3 had good stability.