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Kinetics of reduction of nickel chloride with hydrogen

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Abstract

The kinetics of reduction of nickel chloride with hydrogen were investigated in the temperature range of 533 (260 °) to 788 K (515 °). Most experiments were done with porous NiCl2 granules having −8+10 mesh (Tyler) size. The effects of temperature, sample size, granule size and hydrogen partial pressure on the reduction kinetics were investigated. In the temperature range 533 (260 °) to 651 K (378 °) the reduction is dominated by chemical kinetic factors. At higher temperatures diffusional effects appear to become quite significant. The temperature-dependence of the chemical kinetic rate constantK is given by

$$\log K = 6.744 - \frac{{22,240}}{{2.303RT}};K\,\,is\,\,in\,\,\min ^{ - 1} $$

The activation energy for the reduction was found to be 22,240 cal /mol (or 93,050 J/mol) in the chemical kinetic regime.

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Authors and Affiliations

  1. Division of Metallurgical Engineering, University of Washington, 98195, Seattle, WA

    D. T. Williams (Undergraduate Research Assistant), S. K. El-Rahaiby (Graduate Research Assistant) & Y. K. Rao (Professor)

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  1. D. T. Williams
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  2. S. K. El-Rahaiby
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  3. Y. K. Rao
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Williams, D.T., El-Rahaiby, S.K. & Rao, Y.K. Kinetics of reduction of nickel chloride with hydrogen. Metall Trans B 12, 161–166 (1981). https://doi.org/10.1007/BF02674769

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