Abstract
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.
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