Cobalt powder from Co(OH)2 by hydrogen reduction
Source abstract
Abstract
A study was performed to prepare spherical cobalt powder of about 400 nm from aqueous cobaltous hydroxide slurry under hydrogen reduction conditions using palladium chloride as a catalyst. The reduction kinetics showed good agreement with a surface reaction core model equation, and the activation energy of 35.6 kJ/mol was obtained from the Arrhenius plot at the temperature range of 145-195degreesC. Additionally, a relationship between the half-life of the reduction, the induction period, and the hydrogen gas pressure was found to be as t(1/2) - t(i) = aP(H2)(1-n). (C) 2002 Elsevier Science Ltd. All rights reserved.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nanomaterials for catalytic reactions · Nanoporous metals and alloys · Catalytic Processes in Materials Science
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References (11)
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1. W. Kunda, et al., in: H.H. Hausner (Ed.), Modern Developments in Powder Metallurgy, vol. 1, Plenum Press, New York, 1966, pp. 15–49.10.1007/978-1-4684-7706-1_2 ↗
2. Sista · Metall. Trans. B. · 1981 · 12B · 56510.1007/BF02654328 ↗
3. F. Habashi, Principles of Extractive Metallurgy, vol. 2, Science Publishers, 1969, pp. 252–274.
4. R. Derry, R.G. Whittemore, in: Proceedings of the 2nd International Symposium on Hydrometallurgy, Chicago, USA, 1973, pp. 42–62.
5. Kutty · Mater. Sci. Lett. · 1982 · 1 · 6710.1016/0167-577X(82)90009-X ↗
6. Matsuda · J. Min. Met. Jpn. · 1981 · 49 · 257
7. K. Yu, et al., in: Proceedings of the 1st European East–West Symposium on Materials and Process, Finland, 1990, pp. 10–18.
8. Yamasaki · Metall. Trans. B · 1993 · 24B · 55710.1007/BF02673170 ↗
9. M. Pourbaix, Atlas of Electrochemical Equilibria in Aqueous solutions, National Association of Corrosion Engineers, 1974, pp. 322–329.
10. F. Habashi, Kinetics of Metalllurgical Process, Metallurgie Extractive Quebec, 1999, pp. 149–153.
11. O. Levenspiel, Chemical Reaction Engineering, Wiley, New York, 1972, pp. 53–54.