钴-席夫碱-壳聚糖/凹凸棒土对苯乙烯环氧化的催化性能

以NaOH固化法制备的壳聚糖/凹凸棒土（CS/ATP）复合树脂为载体，以水杨醛和天冬氨酸合成的席夫碱为配体，分别合成Co、Mn、Cu、Fe和Ni的席夫碱金属配合物及其负载型席夫碱金属配合物，并通过FT-IR对其进行结构表征，且以苯乙烯为底物，分子氧为氧源，分别考察了各种催化剂对苯乙烯的环氧化性能。 实验结果表明，在小分子席夫碱金属配体中，Co-Schiff碱催化性能较好。 将Co-Schiff碱负载到CS/ATP复合树脂中，综合考察了Co-Schiff碱-CS/ATP的用量、温度、时间对苯乙烯催化环氧化性能的影响，结果表明，反应温度为80 ℃，反应时间为8 h，苯乙烯的转化率达93.1%。

Catalytic Performance of Cobalt-Schiff Base-Chitosan/attapulgite for Epoxidation of Styrene

With the Schiff base of L-aspartic acid and salicylaldehyde as the ligands, the composite resin of chitosan/attapulgite(CS/ATP) produced by NaOH curing method as the carrier, the Schiff base metal complexes and the load-type Schiff base metal complexes of Co, Mn, Cu, Fe, Ni were synthesized. Their structural characterizations were determined by FT-IR. The catalytic performance of each catalyst for epoxidation of styrene was studied. Experiments show that the catalytic performance of Co-Schiff base is better in small molecule ligand Schiff base metal complexes. Therefore, Co-Schiff base was loaded in CS/ATP composite resin and the effects of the amount of Co-Schiff base-CS/ATP catalyst, reaction temperature and reaction time on the catalytic epoxidation of styrene were investigated. Finally the results show that the best reaction conditions are as follows:the temperature is 80 ℃ and the reaction time is 8 h, which results in a conversion rate of 93.1% for epoxidation of styrene.