On the thermal decomposition of vanadium nitride

It is possible to convert vanadium nitride (VN) to commercial grade vanadium metal, low in total interstitial species, by subjecting it to pyrovacuum decomposition. This paper discusses the effects of experimental parameters such as denitriding temperature, order of vacuum and holding time, etc., on...

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Bibliographic Details
Published in:Journal of materials chemistry 2001-01, Vol.11 (5), p.1514-1518
Main Author: TRIPATHY, P. K
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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Summary:It is possible to convert vanadium nitride (VN) to commercial grade vanadium metal, low in total interstitial species, by subjecting it to pyrovacuum decomposition. This paper discusses the effects of experimental parameters such as denitriding temperature, order of vacuum and holding time, etc., on the extent of transformation of VN to vanadium. Vanadium nitride, prepared by carbonitrothermic reduction of a V sub 2 O sub 5 + C mixture at a temperature of 1500 deg C under continuous nitrogen flow, was thermally decomposed to metallic vanadium. The extent of removal of nitrogen from VN was found to depend upon temperature, time and reduced pressure. A portion of the residual oxygen and carbon, present in VN, was also removed, in the form of CO, during denitrogenation. The optimum decomposition temperature, time and pressure were 1750 deg C, 1 h and 0.05 Pa for a charge of 500 g. The vanadium, obtained at the end of the pyrovacuum heating, is suitable for catalytic applications in industrial processes.
ISSN:0959-9428
1364-5501
DOI:10.1039/b007792p