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8-Hydroxy-2-methylquinoline-modified H4SiW12O40: a reusable heterogeneous catalyst for acetal/ketal formation

机译:8-羟基-2-甲基喹啉改性的H4SiW12O40:用于缩醛/缩酮形成的可重复使用的多相催化剂

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摘要

A heteropoly acid based organic hybrid heterogeneous catalyst, HMQ-STW, was prepared by combining 8-hydroxy-2-methylquinoline (HMQ) with Keggin-structured H _(4) SiW _(12) O _(40) (STW). The catalyst was characterized via elemental analysis, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and potentiometric titration analysis. The catalytic performance of the catalyst was assessed in the ketalization of ketones with glycol or 1,2-propylene glycol. Various reaction parameters, such as the glycol to cyclohexanone molar ratio, catalyst dosage, reaction temperature and time, were systematically examined. HMQ-STW exhibited a relatively high yield of corresponding ketal, with 100% selectivity under the optimized reaction conditions. Moreover, catalytic recycling tests demonstrated that the heterogeneous catalyst exhibited high potential for reusability, and it was revealed that the organic modifier HMQ plays an important role in the formation of a heterogeneous system and the improvement of structural stability. These results indicated that the HMQ-STW catalyst is a promising new type of heterogeneous acid catalyst for the ketalization of ketones.
机译:通过将8-羟基-2-甲基喹啉(HMQ)与Keggin结构的H _(4)SiW _(12)O _(40)(STW)结合,制备了基于杂多酸的有机杂多相催化剂HMQ-STW。通过元素分析,X射线衍射(XRD),傅里叶变换红外光谱(FT-IR),扫描电子显微镜(SEM),热重分析(TG)和电位滴定分析对催化剂进行了表征。在酮与二醇或1,2-丙二醇的缩酮化中评估了催化剂的催化性能。系统地检查了各种反应参数,例如二醇与环己酮的摩尔比,催化剂用量,反应温度和时间。 HMQ-STW表现出相对较高的相应缩酮收率,在优化的反应条件下具有100%的选择性。此外,催化循环测试表明,多相催化剂具有很高的可重复使用性,并且揭示了有机改性剂HMQ在多相体系的形成和结构稳定性的改善中起着重要的作用。这些结果表明,HMQ-STW催化剂是一种有前景的新型酮型酮化非均相酸催化剂。

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