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Reduction-oxidation kinetics of three different iron oxide phases for CO2 activation to CO

机译：三种不同的氧化铁相将CO2活化为CO的还原-氧化动力学

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摘要

The reduction-oxidation characteristics and proper kinetic models of three different iron ores having respective main phases of FeOOH, Fe3O4, and Fe2O3 were investigated using an isothermal method. A proposed kinetic model was well satisfied to explain the experimental data for CO2 activation to CO with a high accuracy. The kinetic data of the different phases of iron ores for its reduction by H-2 and for the oxidation by CO2 were relatively well described by a simple three-dimensional diffusion model of Jander equation. Activation energies of three different iron ores with the phase of FeOOH, Fe2O3, and Fe3O4 for the oxidation by CO2 were found to be 42, 25, and 12 kJ/mol, respectively. Iron ore having a FeOOH phase exhibited a higher redox property by showing a large amount of CO generation through CO2 activation with an activation energy of 42 kJ/mol and a rate constant of 0.0065 min(-1). The superior activities on the FeOOH were mainly attributed to a large surface area with medium grain size of FeOOH crystallites by forming a thermodynamically stable Fe3O4 phase on the outer surfaces even under the reductionoxidation reaction cycle. (C) 2017 Elsevier Ltd. All rights reserved.
机译：采用等温法研究了具有不同主相FeOOH，Fe3O4和Fe2O3的三种不同铁矿石的还原氧化特性和适当的动力学模型。很好地满足了提出的动力学模型，以高精度解释了CO2活化为CO的实验数据。通过简单的三维Jander方程扩散模型，可以较好地描述铁矿石被H-2还原和被CO2氧化的不同相的动力学数据。发现三种不同铁矿石的FeOOH，Fe2O3和Fe3O4相被CO2氧化的活化能分别为42、25和12 kJ / mol。具有FeOOH相的铁矿石通过以42 kJ / mol的活化能和0.0065 min（-1）的活化能通过CO2活化产生大量的CO来显示较高的氧化还原特性。 FeOOH的优异活性主要归因于即使在还原氧化反应循环下，在外表面形成热力学稳定的Fe3O4相，也使FeOOH晶粒具有中等粒径的大表面积。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|547-555|共9页
  • 作者

    Jeong Min Hye; Lee Dong Hyun; Han Gui Young; Shin Chae-Ho; Shin Myoung Kyun; Ko Chang Kuk; Bae Jong Wook;

  • 作者单位

    Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 440746, Gyeonggi Do, South Korea;

    Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 440746, Gyeonggi Do, South Korea;

    Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 440746, Gyeonggi Do, South Korea;

    Chungbuk Natl Univ, Dept Chem Engn, Cheongju 361763, Chungbuk, South Korea;

    POSCO, Tech Res Labs, Ironmaking Res Grp, Pohang Si 37859, Gyeongsangbuk D, South Korea;

    POSCO, Tech Res Labs, Ironmaking Res Grp, Pohang Si 37859, Gyeongsangbuk D, South Korea;

    Sungkyunkwan Univ SKKU, Sch Chem Engn, Suwon 440746, Gyeonggi Do, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Kinetics; Redox reaction; Iron ores; CO2 activation; Chemical looping process;

    机译：动力学氧化还原反应铁矿石CO2活化化学成环过程;

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