Amine-functionalized ionic liquid-based mesoporous organosilica as a highly efficient nanocatalyst for the Knoevenagel condensation

Elhamifar Dawood; Kazempoor Somayeh; Karimi Babak

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Amine-functionalized ionic liquid-based mesoporous organosilica as a highly efficient nanocatalyst for the Knoevenagel condensation

机译：Amine-functionalized离子液态介孔作为一个高效的nanocatalyst organosilica诺文葛耳凝结的

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A novel amine-functionalized ionic liquid-based periodic mesoporous organosilica (PMO-IL-NH2) was prepared and characterized and its catalytic performance was investigated in the Knoevenagel reaction. PMO-IL-NH2 was prepared by simultaneous co-condensation of 3-aminopropyltrimethoxysilane, an ionic liquid and tetramethoxysilane in the presence of a surfactant template under acidic conditions. The material was characterized by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, thermal gravimetric analysis (TGA), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalytic application of PMO-IL-NH2 was then successfully carried out in the Knoevenagel condensation of a variety of different aldehydes with ethyl cyanoacetate under solventfree conditions at room temperature, giving high to excellent yields of the corresponding products. The catalyst was also recovered and reused several times without a significant decrease in either activity or product selectivity. The TEM image and nitrogen sorption analysis of the recovered catalyst after the fifth reaction cycle confirmed its high stability and durability under the applied reaction conditions.

机译：一种新型amine-functionalized离子液态周期性介孔organosilica (PMO-IL-NH2)准备和特征及其催化诺文葛耳性能研究的反应。co-condensation 3-aminopropyltrimethoxysilane,离子液体和tetramethoxysilane一种表面活性剂模板在酸性条件。漫反射红外傅里叶变换(漂移)光谱、热重量分析(TGA)、粉末x射线衍射(PXRD),扫描电子显微镜(SEM)和透射电子显微镜(TEM)。PMO-IL-NH2当时的催化应用诺文葛耳成功进行各种不同的醛的缩合反应与以solventfree之下室温条件下,高优秀的收益率相应的产品。催化剂回收和重用几次没有显著减少活动或产品的选择性。形象和氮吸附分析第五反应后催化剂循环中恢复过来确认其高稳定性和耐用性应用反应条件。

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来源
《Catalysis science & technology》 |2016年第12期|4318-4326|共9页
作者
Elhamifar Dawood; Kazempoor Somayeh; Karimi Babak;
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作者单位

Univ Yasuj, Dept Chem, Yasuj 7591874831, Iran;

IASBS, Dept Chem, Gava Zang 451376731, Zanjan, Iran;

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原文格式 PDF
正文语种英语
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关键词
Knoevenagel condensation; nanocatalyst; tetramethoxysilanemesoporous materialsethyl cyanoacetateScanning Electron Microscope;

机译：诺文葛耳冷凝;nanocatalyst tetramethoxy;

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3. Preparation of copper (II) ion-containing bisimidazolium ionic liquid bridged periodic mesoporous organosilica and the catalytic decomposition of cyclohexyl hydroperoxide [O] . Zheng Xi, Wang Min, Sun Zhiqiang, 2012

机译：preparation of copper (II) ion-containing bisimidazolium ionic liquid bridged periodic mesoporous organosilica and the catalytic decomposition of cyclohexyl hydroperoxide

Amine-functionalized ionic liquid-based mesoporous organosilica as a highly efficient nanocatalyst for the Knoevenagel condensation

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