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首页> 外文期刊>Catalysis Today >Deactivation behavior on VPO and VPO-Zr catalysts in the aldol condensation of methyl acetate and formaldehyde
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Deactivation behavior on VPO and VPO-Zr catalysts in the aldol condensation of methyl acetate and formaldehyde

机译：VPO和VPO-ZR催化剂对乙酸甲酯和甲醛炼油中的VPO和VPO-Zr催化剂的停用行为

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摘要

Improvement in activity for the Zr doped VPO catalyst appears to be a general observation in aldol condensation of methyl acetate and formaldehyde to methyl acrylate. The deactivation behavior significantly differs between VPO and VPO-Zr catalysts. In this work, the deactivation/reactivation behavior and carbon formation in aldol condensation on VPO and VPO-Zr catalysts were investigated. After partial deactivation of the conversion of methyl acetate and formaldehyde to methyl acrylate with a fixed-bed reactor, the deactivated catalysts were fractionated from the reactor. The samples were then analyzed by spectroscopic techniques, gas adsorption measurements and thermogravimetry. The VPO-Zr catalyst showed differences in deactivation/reactivation behavior from the VPO catalyst under same reaction conditions. This finding could be partially ascribed to different coke locations in the deactivated catalysts with varied porosity. The IV4+/IV5+ratio of V atom remarkably differed among fresh, used, and refreshed catalysts, which could be a key factor affecting catalyst deactivation. The relations of carbon formation and reaction time were fitted by empirical Voorhies equation over VPO and VPO-Zr catalysts.1.
机译：Zr掺杂VPO催化剂的活性的改善似乎是乙酸甲酯和甲醛对丙烯酸甲酯的羟醇缩合的一般观察。 VPO和VPO-ZR催化剂之间的失活行为显着不同。在这项工作中，研究了VPO和VPO-ZR催化剂对醛醇缩合的失活/再活化行为和碳形成。在用固定床反应器将乙酸甲酯和甲醛转化为丙烯酸甲酯的甲基甲基甲基甲基甲基甲基丙烯酸甲酯之后，从反应器中分离去活化的催化剂。然后通过光谱技术，气体吸附测量和热重试样分析样品。 VPO-ZR催化剂在相同的反应条件下显示出从VPO催化剂的失活/再活化行为的差异。该发现可以部分地归因于具有不同孔隙率的失活催化剂中的不同焦炭位置。 V原子的IV4 + / IV5 +比率在新鲜，使用和清新的催化剂中具有显着不同，这可能是影响催化剂失活的关键因素。通过VPO和VPO-Zr催化剂的经验voorhies方程拟合碳形成和反应时间的关系。

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  • 来源
    《Catalysis Today》 |2018年第2018期|共7页
  • 作者

    Dan Yang; Gang Wang; Hui Wu; Xinpeng Guo; Suojiang Zhang; Zengxi Li; Chunshan Li;

  • 作者单位

    School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences;

    School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences;

    Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems The National Key Laboratory of Clean and Efficient Coking Technology Institute of Process Engineering College of Chemistry and Chemical Engineerin;

    Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems The National Key Laboratory of Clean and Efficient Coking Technology Institute of Process Engineering College of Chemistry and Chemical Engineerin;

    Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems The National Key Laboratory of Clean and Efficient Coking Technology Institute of Process Engineering College of Chemistry and Chemical Engineerin;

    School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences;

    Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems The National Key Laboratory of Clean and Efficient Coking Technology Institute of Process Engineering College of Chemistry and Chemical Engineerin;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学动力学、催化作用;催化反应过程;
  • 关键词

    VPO; VPO-Zr; Aldol condensation; Deactivation behavior; Carbon formation;

    机译：VPO;VPO-Zr;aldol凝结;失活行为;碳形成;

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