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首页> 外文期刊>RSC Advances >8-Hydroxy-2-methylquinoline-modified H4SiW12O40: a reusable heterogeneous catalyst for acetal/ketal formation
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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H4SIW12O40：一种可重复使用的缩醛/缩甲醛形成的异质催化剂

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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 H4SiW12O40 (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：基于有机混合非均相催化剂，HMQ-STW杂多酸，通过8-羟基-2-甲基喹啉（HMQ）用的Keggin结构的硅钨酸掺杂（STW）组合来制备。将催化剂通过元素分析，X射线衍射法（XRD）表征，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。该催化剂的催化性能与乙二醇或1,2-丙二醇酮的缩酮化进行了评估。各种反应参数，如乙二醇环己酮的摩尔比，催化剂用量，反应温度和时间，进行了系统的研究。 HMQ-STW表现出对应缩酮的相对高的产率，用优化的反应条件下100％的选择性。此外，催化循环测试表明，所述非均相催化剂显示出高的电势为可重用性，并且它显露有机改性剂HMQ起着在非均相体系的形成和结构稳定性的改善具有重要作用。这些结果表明，HMQ-STW催化剂是用于酮的缩酮化的新型非均相酸催化剂的有前途的。

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  • 来源
    《RSC Advances》 |2018年第46期|共8页
  • 作者

    Liu Li-jun; Luan Qing-jie; Lu Jing; Lv Dong-mei; Duan Wen-zeng; Wang Xu; Gong Shu-wen;

  • 作者单位

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

    Shandong Normal Univ Coll Chem Chem Engn &

    Mat Sci Jinan 250014 Shandong Peoples R China;

    Liaocheng Univ Sch Chem &

    Chem Engn Inst Funct Organ Mol &

    Mat 1 Hunan Rd Liaocheng 252000 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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