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首页> 外文期刊>RSC Advances >An elegant synthesis of chitosan grafted hydrotalcite nano-bio composite material and its effective catalysis for solvent-free synthesis of jasminaldehyde
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An elegant synthesis of chitosan grafted hydrotalcite nano-bio composite material and its effective catalysis for solvent-free synthesis of jasminaldehyde

机译：含壳聚糖嫁接水滑石纳米生物复合材料的优雅合成及其有效催化作用茉莉合成吡啶醛

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摘要

A novel nano-bio composite of chitosan and a layered double hydroxide was elegantly synthesized by a co-precipitation method. The nano-bio composite material (CMA) was thoroughly characterized by FTIR, TGA, XRD, SEM and TEM. The composite material CMA showed efficient catalytic activity for selective synthesis of jasminaldehyde under solvent free conditions by condensation of benzaldehyde and 1-heptanal. In typical employed conditions, 39.5 mmol benzaldehyde, 7.9 mmol 1-heptanal, 100 mg catalyst, 160 degrees C and 700 rpm, a maximum selectivity of 89% with 99% conversion was obtained. The investigations were performed in detail as a function of the amount of catalyst, temperature and molar ratio of 1-heptanal to benzaldehyde to observe the effect of these reaction parameters on the conversion, selectivity and rate of the formation of the condensation products. All these parameters were found to influence the performance of the catalyst. The initial rate of formation of jasminaldehyde was found to be similar to 20% more than the rates with individual chitosan and hydrotalcite. The rate of formation of 2-pentyl-2-nonenal with CMA was found to be lower in comparison with individual catalysts, chitosan and hydrotalcite. The determined activation energy was 16.3 kJ mol(-1). The catalyst was elegantly separated, washed and dried, and found to be effectively recycled six times without any substantial loss in its activity.
机译：通过共沉淀法优雅地合成了壳聚糖和层状双氢氧化物的一种新型纳米生物复合物。通过FTIR，TGA，XRD，SEM和TEM彻底地表征纳米生物复合材料（CMA）。复合材料CMA通过苯甲醛和1-庚醇的缩合，在溶剂自由条件下选择性合成茉莉醛的有效催化活性。在典型的使用条件下，39.5mmol苯甲醛，7.9mmol 1-庚醛，100mg催化剂，160℃和700rpm，获得了99％转化率的89％的最大选择性。调查进行了详细为催化剂，温度和1-庚到苯甲醛的摩尔比的量的函数，观察上的冷凝产物的形成的转化率，选择性和速率这些反应参数的效果进行。发现所有这些参数都会影响催化剂的性能。发现Jasminaldehyde的初始形成率与单个壳聚糖和水滑石的速率相似。与个体催化剂，壳聚糖和水滑石相比，发现2-戊-2-壬比的形成速率降低。确定的活化能量为16.3 kJ摩尔（-1）。催化剂典雅地分离，洗涤和干燥，发现有效地再循环六次，而不在其活性中损失。

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  • 来源
    《RSC Advances》 |2015年第115期|共9页
  • 作者

    Adwani Jacky H.; Khan Noor-ul H.; Shukla Ram S.;

  • 作者单位

    CSIR Cent Salt &

    Marine Chem Res Inst CSIR CSMCRI Acad Sci &

    Innovat Res AcSIR Bhavnagar 364002 Gujarat India;

    CSIR Cent Salt &

    Marine Chem Res Inst CSIR CSMCRI Acad Sci &

    Innovat Res AcSIR Bhavnagar 364002 Gujarat India;

    CSIR Cent Salt &

    Marine Chem Res Inst CSIR CSMCRI Acad Sci &

    Innovat Res AcSIR Bhavnagar 364002 Gujarat India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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