Investigation of the kinetics of reduction of nickel tungstate by hydrogen

S. Sridhar, D. U. Sichen, S. Seetharaman

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30 Scopus citations

Abstract

In the present work, the kinetics of reduction of nickel tungstate, NiWO4, by hydrogen was investigated by a thermogravimetric method in the temperature range 891 to 1141 K. The experiments were conducted under both isothermal and nonisothermal conditions. The products were examined by X-ray diffraction analysis. The results indicate that the reduction reaction proceeds in two steps; first, reduction of NiWO4 to nickel as well as WO2 and then WO2 to tungsten. From the isothermal experiments, the activation energies of the two reaction steps were calculated to be 95.3 ± 4.9 and 80.8 ± 6.4 kJ · mol-1, respectively. The activation energy value obtained from nonisothermal experiments for the first step is in agreement with the isothermal experiments. The values are compared with the activation energies reported in other literature for the individual oxides.

Original languageEnglish (US)
Pages (from-to)391-396
Number of pages6
JournalMetallurgical and Materials Transactions B
Volume25
Issue number3
DOIs
StatePublished - Jun 1994
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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