Continuous dynamically controlled low-temperature combustion synthesis of ultrafine Co3O4 powders: Experiment and theoretical analysis

Ultrafine cobalt oxide (Co 3 O 4 ) powders were prepared by bubbling bed technique, an efficient and low energy consuming process of combustion synthesis technology. In this paper, discussed are the thermal decomposition of cobalt(II) oxalate dihydrate (CoC 2 O 4 ·2H 2 O), stability of a bubbling la...

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Bibliographic Details
Published in:International journal of self-propagating high-temperature synthesis 2012-10, Vol.21 (4), p.217-223
Main Authors: Wu, C. H., Chen, S. S., Nie, H. B., Lin, G. A., Wu, Q. S.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
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Summary:Ultrafine cobalt oxide (Co 3 O 4 ) powders were prepared by bubbling bed technique, an efficient and low energy consuming process of combustion synthesis technology. In this paper, discussed are the thermal decomposition of cobalt(II) oxalate dihydrate (CoC 2 O 4 ·2H 2 O), stability of a bubbling layer, air flow velocity, and heat distribution in the system under consideration. Key factors for regulating the process parameters are (a) reaction heat of cobalt oxalate decomposition, (b) air flow velocity and (c) reaction temperature. The optimum combustion temperature of 320–450°C and air velocity larger than the critical velocity by a factor of 1.5–2.0 can be achieved through variation in the ratio of material supply to air flow velocity.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386212040085