Chinese Journal of Applied Chemistry

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

FENG Huixia*, GAO Xiaohong, CHEN Nali, DUAN Lingling, ZHANG Juan, LI Hanfeng   

  1. (College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
  • Received:2013-03-14 Revised:2013-04-21 Published:2014-02-10 Online:2014-02-10

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.

Key words: Schiff base metal complexes, styrene, chitosan/attapulgite, catalysis of epoxy

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