Through a co-condensation method,a series of silicon-based triethylamine (TEA) ionic liquid solid base materials [TEA-MCM-41(x)] were synthesized in a one-pot process.The physicochemical properties of the materials were characterized by Fourier transform infrared spectrometer,X-ray diffractometer,thermogravimetric analyzer,N2 adsorption-desorption technique,X-ray photoelectron spectrometer and Hammett indicator.The analytic results indicated the material owned a typical mesoporous structure with large surface areas and narrow pore size distribution via co-condensation between ethyl orthosilicate and silicon-based triethylamine ionic liquid under the guidance of template agent CTAB.These TEA-MCM-41(x) materials were evaluated as catalysts in Knoevenagel condensation of anisaldehyde and malonitrile,in which TEA-MCM-41(10) with 10% TEA ionic liquid loading exhibited the superior catalytic activity.Under the optimum conditions:catalyst dosage of 0.08mmol,molar ratio of anisaldehyde to malonitrile of 1∶1.25,reaction temperature of 30℃ and reaction time of 1h,anisaldehyde could be quantitatively converted into the target product (4-methoxybenzylidene) malononitrile.After five repeated uses,there was no obvious decline in catalytic activity.
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基金资助
江苏省绿色催化材料与技术实验室开放课题(BM2012110);江苏省高等学校基础科学(自然科学)研究重大项目(23KJA530001)
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