Ryu Young Bok, Baek Jae Ho, Kim Yangdo, Lee Man Sig
J Nanosci Nanotechnol. 2015 Jan;15(1):321-5. doi: 10.1166/jnn.2015.8343.
Reactions of glycerol carbonate using glycerol and urea have been carried out previously using ZnSO4 and ZnO catalysts, and high yields have been reported using ZnSO4 as catalyst. However, this salt is soluble in glycerol, and recycling of catalyst is difficult after the reaction. In this study, we prepared a mixed metal oxide catalyst using Zn and Al, and this catalyst consisted of a mixture of ZnO and ZnAl2O4. We confirmed the conversion of glycerol and the yield of glycerol carbonate of the amount of Al. As a result, we obtained a yield of 82.3% and a conversion of 82.7%. In addition we obtained high yield in recycling of catalyst. The yield of the glycerol carbonate increases with an increase of acid and base site of catalysts and the highest catalytic activity was obtained when acid/base ratio was approx. 1. From this result, we may conclude that the acid and base site density and ratio of catalysts were very important parameters in the synthesis of glycerol carbonate from urea and glycerol.
先前已使用硫酸锌和氧化锌催化剂进行了由甘油和尿素制备碳酸甘油酯的反应，据报道使用硫酸锌作为催化剂时产率较高。然而，这种盐可溶于甘油，反应后催化剂的循环利用很困难。在本研究中，我们制备了一种锌铝混合金属氧化物催化剂，该催化剂由氧化锌和锌铝尖晶石的混合物组成。我们确定了甘油的转化率以及碳酸甘油酯的产率与铝含量的关系。结果，我们获得了82.3%的产率和82.7%的转化率。此外，我们在催化剂循环利用方面也获得了高产率。碳酸甘油酯的产率随着催化剂酸碱位点的增加而提高，当酸碱比约为1时获得了最高的催化活性。从该结果可以得出，催化剂的酸碱位点密度和比例是由尿素和甘油合成碳酸甘油酯过程中非常重要的参数。
