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首页> 外文期刊>Catalysis science & technology >Metal-organic frameworks for catalysis: the Knoevenagel reaction using zeolite imidazolate framework ZIF-9 as an efficient heterogeneous catalyst
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Metal-organic frameworks for catalysis: the Knoevenagel reaction using zeolite imidazolate framework ZIF-9 as an efficient heterogeneous catalyst

机译:用于催化的金属有机框架:使用沸石咪唑酸盐框架ZIF-9作为有效的异质催化剂的knoevenagel反应

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摘要

Crystalline zeolite imidazolate framework ZIF-9 was synthesized from the reaction of cobalt nitrate hexahydrate and benzimidazole by a solvothermal method, and was used as an efficient heterogeneous catalyst for the low temperature liquid phase Knoevenagel reaction. The solid catalyst was characterized by various techniques, including X-ray powder diffraction (XRD). scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic laser light scattering (DLS), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), atomic absorption spectrophotometry (AAS), and nitrogen physisorption measurements. Excellent conversions were achieved under mild conditions. The ZIF-9 catalyst was easily isolated from the reaction mixture by simple filtration and reused several times without a significant degradation in activity. Moreover, there was no contribution from leached active species and conversion was only being possible in the presence of the solid catalyst.
机译:通过溶剂热方法从硝酸钴六碳酸盐和苯咪唑的反应中合成了晶沸石咪唑酸酯框架ZIF-9,并用作低温液体相knoevenagel反应的有效异构催化剂。固体催化剂的特征是各种技术,包括X射线粉末衍射(XRD)。扫描电子显微镜(SEM),透射电子显微镜(TEM),动态激光光散射(DLS),热重分析(TGA),傅立叶变换红外光谱(FT-IR),原子吸收光谱光谱法(AAS)和硝化物质物理学测量值。在温和的条件下实现了出色的转化。 ZIF-9催化剂很容易通过简单的过滤从反应混合物中分离出来,并重复了几次,而没有显着的活性降解。此外,没有浸出活性物种的贡献,只有在存在固体催化剂的情况下才有可能。

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