Synthesis of optically active lactide catalyzed by nanocrystals of La-Ti composite oxides  

作　　者：谷俐 李菲 马红霞 张洋 

机构地区：[1]School of Biology and Chemical Engineering,Jiaxing University

出　　处：《Journal of Central South University of Technology》2008年第4期469-473,共5页中南工业大学学报（英文版）

基　　金：Project(50174059)supported by the National Natural Science Foundation of China;Project(Y406469)supported by Natural Science Foundation of Zhejiang Province

摘　　要：With sol-gel method,nanometer La-Ti composite oxides were prepared.By means of atomic force microscope,the surface pattern,particle size distribution and specific surface area were studied.The newly prepared nanocrystals of La-Ti composite oxides were used as the catalysts to catalyze the dehydration of external compensated lactic acid to lactide.The lactide product was measured by polarimeter and micropolariscope.The results demonstrate that the ratio between D-lactide and L-lactide will not be equal to 1-1 if nanocrystals of La-Ti composite oxides are used as the catalysts,which implies,that nanocrystals of La-Ti composite oxides may be potential catalysts with a good selectivity.With sol-gel method, nanometer La-Ti composite oxides were prepared. By means of atomic force microscope, the surface pattern, particle size distribution and specific surface area were studied. The newly prepared nanocrystals of La-Ti composite oxides were used as the catalysts to catalyze the dehydration of external compensated lactic acid to lactide. The lactide product was measured by polarimeter and micropolariscope. The results demonstrate that the ratio between D-lactide and L-lactide will not be equal to 1：1 if nanocrystals of La-Ti composite oxides are used as the catalysts, which implies, that nanocrystals of La-Ti composite oxides may be potential catalysts with a good selectivity.

关 键 词：La-Ti composite oxides lactic acid LACTIDE CATALYSIS optical activity 

分 类 号：O643.3[理学—物理化学]