Kinetic studies of reduction of some transition metal tungstates
- Royal Inst. of Tech., Stockholm (Sweden). Div. of Theoretical Metallurgy
The present study deals with the kinetic studies of reduction of some selected transition metal tungstates with hydrogen. The measurements were carried out by the isothermal thermogravimetric method. Shallow powder beds were employed in order to avoid the effects due to transport phenomena affecting the reaction rate. In this way, the chemical reaction rates could be selectively studied. The experiments were carried out in the temperature range 873--1,173 K. From the experimental data, the activation energies were evaluated and were found to be around 88 kJ/mol in the case of both iron as well as cobalt tungstates indicating the similarities in W-O bonds in both cases. The activation energies obtained are discussed in the light of the position of the transition metal in the periodic table as well as the thermodynamic stabilities of the various tungstates.
- OSTI ID:
- 367637
- Report Number(s):
- CONF-960202-; ISBN 0-87339-310-4; TRN: IM9640%%383
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Design fundamentals of high temperature composites, intermetallics, and metal-ceramics systems; Lin, R.Y. [ed.] [Univ. of Cincinnati, OH (United States). Dept. of Materials Science and Engineering]; Chang, Y.A. [ed.] [Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering]; Reddy, R.G. [ed.] [Univ. of Nevada, Reno, NV (United States). Dept. of Chemical and Metallurgical Engineering]; Liu, C.T. [ed.] [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.]; PB: 461 p.
- Country of Publication:
- United States
- Language:
- English
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