Swelling acidic poly(ionic liquid)s as efficient catalysts for the esterification of cyclohexene and formic acid

• 作者: Bihua Chen Guohua Gao Jingshun Zhang Sanguan Ma Xin Wang Yongya Zhang
• 来源期刊: 绿色能源与环境:英文版
• 学科: 化学
• 关键词: Acidic poly(ionic liquid)s SWELLING ESTERIFICATION CYCLOHEXENE
• 年，卷（期）: 2020,（2）
• 页码范围: 138-146
• 页数: 9页
• 分类号: O64

摘要

Acidic poly(ionic liquid)s(PILs)with swelling ability were synthesized by free radical copolymerization of N-vinylimidazolium ionic liquids,divinylbenzene(DVB)and sodium acrylate(NaAA),and further acidification by sulfuric acid.The swelling ability of acidic PILs was greatly affected by cross-linker content and chain length of 3-alkyl-substituents on imidazolium.Cross-linked network structures could be observed from the cryogenic scanning electron microscopy(cryo-SEM)images of the swollen acidic PILs in formic acid.Acidic PILs with network structures in swollen state exhibited excellent activities in the esterification of cyclohexene and formic acid,and the catalytic activities were in positive correlation with their swelling abilities.Acidic PIL with 3-octyl-substituent and 2.5 mol%DVB(PIL-C8-2.5DVB-HSO4)had the highest swelling ability in formic acid and exhibited comparable catalytic activities with homogeneous catalysts such as sulfuric acid and p-toluenesulfonic acid.