Hydrophobic Mesoporous Poly(ionic liquid)s towards Highly Efficient and Contamination-Resistant Solid-Base Catalysts

被引:63
作者
Wang, Xiaochen [1 ]
Li, Jing [1 ]
Chen, Guojian [1 ]
Guo, Zengjing [1 ]
Zhou, Yu [1 ]
Wang, Jun [1 ]
机构
[1] Nanjing Tech Univ, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
basicity; hydrophobic effect; ionic liquids; mesoporous materials; polymers; IONIC LIQUID; KNOEVENAGEL CONDENSATION; CYCLOADDITION REACTIONS; HETEROGENEOUS CATALYST; SURFACE-AREA; CO2; CAPTURE; FLUE-GAS; POLYMERS; ACID; TRANSESTERIFICATION;
D O I
10.1002/cctc.201402995
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mesoporous poly(ionic liquid)s were synthesized by radical copolymerization of the ionic liquid 1-aminoethyl-3-vinylimidazolium bromide with divinylbenzene plus the ion exchange of bromide anions with hydroxyls. Characterizations revealed the high ionic liquid content, large surface area, and hydrophobicity for the sample prepared with equimolar amounts of ionic liquid and divinylbenzene, with good accessibility to organic compounds and resistance to CO2/H2O contamination. The mesoporous copolymer behaved as a superior and recyclable solid-base catalyst for solvent-free Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate, giving the much higher turnover frequency of 304h(-1) (yield 99%, 0.5h) than those of the nonporous analogues, commercial strong basic resins, and even homogeneous NaOH. The high activity was confirmed by Knoevenagel condensation with various substrates and Claisen-Schmidt condensation. A possible synergistic Lewis-BrOnsted dual-base-center mechanism is proposed for understanding the catalytic behavior.
引用
收藏
页码:993 / 1003
页数:11
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