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首页> 外文期刊>Materials Science and Engineering >Synthesis, characterization and catalytic activity of chromium substituted cobalt ferrospinels
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Synthesis, characterization and catalytic activity of chromium substituted cobalt ferrospinels

机译：铬取代的钴铁盐铁的合成，表征和催化活性

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摘要

Chromium substituted cobalt ferrospinels were prepared by soft citrate gel method. The synthesized material was characterized by various physico-chemical methods. All the samples showed a single-phase cubic structure. Lattice constant varies from 8.389 to 8.323 A. Transmission electron microscopic study indicated the nanostructure of the catalysts while homogenous grain distribution was presented by scanning electron microscopic studies. The catalytic activity of the samples was investigated towards acetylation of phenols. The presence of active centers on the surface of the material was confirmed through pyridine adsorption studies. The surface acidity of the catalyst is responsible for better catalytic performance. The material was found to serve as a promising catalyst for acylation and benzoylation of phenols under solvent free condition. These catalysts are -100% selective towards o-acylation of phenols, a promising reaction for perfumery intermediates. The catalysts were seen to be reusable without any further treatment. Catalytic activities of cobalt, chromium and iron oxides were also investigated for comparison. The cobalt ferrospinel was found to have better catalytic activity as compared to the Crsubstituted ferrospinels and the pure oxides. Cobalt ferrite catalyst offers high yields in a short reaction time under solvent-free conditions.
机译：用软柠檬酸盐凝胶法制得铬取代的钴铁碱。通过各种物理化学方法对合成的材料进行了表征。所有样品均显示出单相立方结构。晶格常数在8.389至8.323 A之间变化。透射电子显微镜研究表明催化剂的纳米结构，而通过扫描电子显微镜研究呈现出均匀的晶粒分布。研究了样品对苯酚乙酰化的催化活性。通过吡啶吸附研究证实了材料表面上活性中心的存在。催化剂的表面酸度有助于获得更好的催化性能。发现该材料可在无溶剂条件下用作酚的酰化和苯甲酰化的有前途的催化剂。这些催化剂对酚的邻酰化反应具有-100％的选择性，这是香料中间体的一种有前途的反应。看到该催化剂无需进一步处理即可重复使用。还比较了钴，铬和铁氧化物的催化活性。已发现与铬取代的亚铁吡啶和纯氧化物相比，亚铁吡啶钴具有更好的催化活性。在无溶剂条件下，钴铁氧体催化剂可在短时间内提供高产率。

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  • 来源
    《Materials Science and Engineering》 |2011年第2期|p.103-109|共7页
  • 作者

    P.P. Hankare; U.B. Sankpal; R.P. Patil; P.D. Lokhande; R. Sasikala;

  • 作者单位

    Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, 416004, India;

    Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, 416004, India;

    Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, 416004, India;

    Department of Chemistry, University of Pune, Pune, Maharashtra, 411007, India;

    Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;

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  • 正文语种 eng
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  • 关键词

    spinel tem solvent free phenols;

    机译：尖晶石型无溶剂酚;

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