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首页> 外文期刊>RSC Advances >H3PW12O40 synergized with MCM-41 for the catalytic nitration of benzene with NO2 to nitrobenzene
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H3PW12O40 synergized with MCM-41 for the catalytic nitration of benzene with NO2 to nitrobenzene

机译：H3PW12O40与MCM-41协同作用，用于苯的苯与NO2催化硝化硝基苯

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摘要

Developing a new environmentally friendly process for benzene nitration to nitrobenzene has been highly desirable for a long time. In this work, NO2 was used as a nitration agent to replace traditional nitric acid, and different mesoporous SiO2 and their supported heteropoly acid (salt) were employed to catalyze benzene nitration to nitrobenzene. Several typical catalysts were characterized using XRD, BET and FT-IR, and the acid amounts of the various catalysts were determined. The effects of various factors such as different catalysts, the molar ratio of benzene to NO2, reaction temperature, reaction time, HPW loading, the acid amounts of the catalyst and the reuse of the catalyst on the nitration reaction have also been systematically examined. The results indicate that the supported HPW/MCM-41 catalysts exhibit a remarkably synergistic catalytic performance on the nitration reaction of benzene to nitrobenzene. In particular, the 50% HPW/MCM-41 catalyst gives the best results with 73.4% benzene conversion and 98.8% selectivity to nitrobenzene under the optimal reaction conditions. Moreover, the mesoporous structure of MCM-41 was retained under the high loading of HPW. The possible reaction mechanism for the nitration reaction of benzene with NO2 over HPW/MCM-41 is suggested in the present work. This method provides a promising strategy for the preparation of nitro-aromatic compounds from a catalytic nitration reaction by using NO2 as the nitration reagent.
机译：开发用于苯硝化硝基苯一个新的环境友好的工艺已经非常可取的很长一段时间。在这项工作中，NO 2被用作硝化剂，以取代传统的硝酸，和不同的介孔二氧化硅和它们的负载杂多酸（盐）进行了用于催化苯硝化硝基苯。使用XRD，BET和FT-IR几种典型催化剂进行了表征，并测定各种催化剂的酸量。的各种因素，例如不同的催化剂，苯与NO 2的摩尔比，反应温度，反应时间，HPW加载时，酸量的催化剂并在硝化反应催化剂的再利用的效果也已被系统地检查。结果表明，所支持的HPW / MCM-41催化剂表现出对苯对硝基苯硝化反应显着协同的催化性能。特别地，50％HPW / MCM-41的催化剂，得到具有最佳的反应条件下73.4％的苯的转化率和98.8％的选择性硝基苯最好的结果。此外，MCM-41的中孔结构HPW的高负载下被保留。用于与NO2超过HPW / MCM-41苯的硝化反应的可能的反应机理，建议在目前的工作。此方法提供了一种用于从通过使用NO 2作为硝化试剂的催化硝化反应制备硝基芳族化合物的有希望的策略。

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  • 来源
    《RSC Advances》 |2015年第89期|共8页
  • 作者

    You Kuiyi; Deng Renjie; Jian Jian; Liu Pingle; Ai Qiuhong; Luo Hean;

  • 作者单位

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

    Xiangtan Univ Sch Chem Engn Xiangtan 411105 Peoples R China;

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