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Heteropolyacid generated on the surface of iron phosphate nanotubes: structure and catalytic activity studies

机译：在磷酸铁纳米管表面产生的杂多酸：结构和催化活性研究

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摘要

Structural and catalytic properties of a Mo based heteropolyacid generated after impregnation of MoOx on the surface of porous iron phosphate nanotubes (FeP) were studied. Nano sized MoOx-FeP composites with different Mo molar loadings (1-5%) have been prepared under acidic conditions. Synthesized composites were characterised by elemental analysis, X-ray diffraction, transmission electron microscopy, Raman spectroscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, acidity measurements using FTIR, N-2-physisorption and H-2-temperature programmed reduction methods. Spectroscopic characterization results suggest that Keggin-type FeMoP species were formed on the surface of the iron phosphate nanotubes in the case of catalysts with higher (4 and 5 mol%) Mo loadings. Pure iron phosphate nanotubes, Fe2O3, MoO3 and bulk FeMoP HPA samples are less active than MoOxFeP composite samples for the benzylation of benzene with benzyl chloride, particularly the 5 mol% Mo loaded catalyst showed high activity. The enhanced catalytic activity of this catalyst is attributed to the presence of easily reducible, acidic and porous FeMoP heteropolyacid species. These materials can be readily separated from the reaction system for reuse. They are resistant to leaching of the active heteropolyacid species.
机译：研究了在多孔铁磷酸盐纳米管（FEP）表面上浸渍MOOX后产生的MO的杂多酸的结构和催化性能。在酸性条件下制备了具有不同Mo摩尔载量（1-5％）的纳米大小的MOOX-FEP复合材料。合成复合材料的特征是通过元素分析，X射线衍射，透射电子显微镜，拉曼光谱，UV-Vis光谱，X射线光电子能谱，使用FTIR，N-2物理吸附和H-2温控的减少方法进行酸度测量。光谱性表征结果表明，在具有更高（4和5mol％）Mo载荷的催化剂的情况下，在磷酸铁纳米管的表面上形成Keggin型映射物种。纯铁磷酸纳米管，Fe2O3，MOO3和散装股份HPA样品比MoxFep复合样品的苄酰化与苄酰氯的苄化复合样品更少，特别是5摩尔％Mo负载催化剂显示出高活性。该催化剂的增强催化活性归因于易于可降低的，酸性和多孔的妇女杂酸盐物质。这些材料可以容易地与反应系统分离以进行再利用。它们对活性杂酸盐物质的浸出是抗性的。

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  • 来源
    《RSC Advances》 |2015年第78期|共13页
  • 作者

    Al-Mutairi Ebtesam; Narasimharao Katabathini; Mokhtar Mohamed;

  • 作者单位

    King Abdulaziz Univ Dept Chem Fac Sci Jeddah 21589 Saudi Arabia;

    King Abdulaziz Univ Dept Chem Fac Sci Jeddah 21589 Saudi Arabia;

    King Abdulaziz Univ Dept Chem Fac Sci Jeddah 21589 Saudi Arabia;

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  • 正文语种 eng
  • 中图分类 化学;
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