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首页> 外文期刊>Metallurgical and Materials Transactions B >Kinetic Studies on Hydrogen Reduction of MoO3 and Morphological Analysis of Reduced Mo Powder
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Kinetic Studies on Hydrogen Reduction of MoO3 and Morphological Analysis of Reduced Mo Powder

机译：MoO3还原氢的动力学研究及还原Mo粉的形态分析

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摘要

The studies on hydrogen reduction of MoO3 indicated two main stages, namely, MoO3 to MoO2 and MoO2 to Mo. In both stages, temperature and time of reduction progressively increased on diluting hydrogen from 100 to 10 pct. Detailed kinetic analysis of the MoO2 to Mo stage was conducted by carrying out isothermal reduction between 625 °C and 900 °C by pure hydrogen. The kinetic equation was found to be $$ g{left( alpha right)} = {left[ { - ln {left( {1 - alpha } right)}} right]}^{{raise0.7exhbox{$1$} !mathord{left/ {vphantom {1 n}}right.kern-0em} !lower0.7exhbox{$n$}}} = {text{k}}t $$ , with n ranging from 1.49 to 2.13. The rate constant k obeyed the Arrhenius temperature dependence with the associated activation energy of 136 kJ mol?1. The X-ray diffraction (XRD) analysis of the product confirmed the phases predicted by thermal analysis. The scanning electron microscope (SEM) analysis of molybdenum powder revealed the presence of a greater number of pores and cracks in the individual particles produced at lower reduction temperatures and the tendency of acquiring spherical morphology with increasing reduction temperature. Based on the studies conducted, the optimum conditions for MoO3 to Mo reduction were predicted.
机译：MoO3 的氢还原研究表明，MoO3 变成MoO2 和MoO2 变成Mo的两个主要阶段。在这两个阶段中，还原的温度和时间逐渐增加。稀释氢从100到10 pct。通过在625°C和900°C之间用纯氢等温还原，对MoO2 到Mo阶段进行了详细的动力学分析。发现动力学方程为$$ g {left（{alpha（右））} = {left [{-ln {left（{1-alpha} right）}} right]} ^ {{raise0.7exhbox {$ 1 $}！ mathord {left / {vphantom {1 n}} right.kern-0em}！lower0.7exhbox {$ n $}}} = {text {k}} t $$，n范围为1.49至2.13。速率常数k符合阿累尼乌斯温度依赖性，其活化能为136 kJ mol？1 。产物的X射线衍射（XRD）分析证实了通过热分析预测的相。钼粉的扫描电子显微镜（SEM）分析显示，在较低的还原温度下产生的单个颗粒中存在大量的孔和裂纹，并且随着还原温度的升高，球状结构趋于获得。在进行研究的基础上，预测了MoO3 还原Mo的最佳条件。

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  • 来源
    《Metallurgical and Materials Transactions B》 |2008年第3期|431-438|共8页
  • 作者

    S. Majumdar; I.G. Sharma; I. Samajdar; P. Bhargava;

  • 作者单位

    Materials Processing Division Bhabha Atomic Research Centre Mumbai 400085 India;

    Materials Processing Division Bhabha Atomic Research Centre Mumbai 400085 India;

    Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Powai Mumbai 400076 India;

    Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Powai Mumbai 400076 India;

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