Layered double hydroxide anchored ionic liquids as amphiphilic heterogeneous catalysts for the Knoevenagel condensation reaction
作者:Tengfei Li、Wei Zhang、Wei Chen、Haralampos N. Miras、Yu-Fei Song
DOI:10.1039/c7dt03665e
日期:——
attention has been dedicated to the development of heterogeneous base catalysts providing a green and sustainable process in benign aqueous media. Herein, the ionic liquid modified layered double hydroxide (LDH) based catalysts of LDH-IL-Cn (n = 4, 8, 12) were prepared by adopting an exfoliation/assembly strategy, in which the ionic liquids (ILs) were covalently anchored onto the surface of LDH layers. The
近年来,人们一直致力于开发在良性水性介质中提供绿色和可持续工艺的非均相碱催化剂。在此,通过采用剥落/组装策略制备了LDH-IL-C n(n = 4、8、12)的离子液体改性层状双氢氧化物(LDH)基催化剂,其中离子液体(ILs)是共价的固定在LDH层的表面上。通过FT-IR,固态13 C NMR,29 Si CP / MAS NMR,27 Al-MAS NMR,XRD,TG-DTA,BET,XPS,SEM,CO 2-表征所得的LDH-IL-C n。 TPD,接触角实验等。在室温下,LDH-IL-C12在H 2 O中对各种醛与氰基乙酸乙酯/丙二腈的Knoevenagel缩合反应的催化性能显示出优异的收率和选择性。而且,LDH-IL-C12的碱催化剂可以容易地再循环和再使用至少5次,而不会降低其催化效率。放大实验表明,该催化剂保留了其效率和坚固性。