Synthesis of vanadium carbide by temperature programmed reaction

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1415· OSTI ID:283010

Kapoor, R; Oyama, S T ^[1]

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1. Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States)

Vanadium carbide powders are prepared with moderate surface areas of 60 m{sup 2} g{sup -1} (particle size 17 nm) by a temperature programmed reaction between solid vanadium pentoxide (19 m{sup 2} g{sup -1}) and a methane-hydrogen mixture. The synthesis involves two steps. In the first step a single suboxide intermediate, V{sub 2}O{sub 3} is formed by reduction of V{sub 2}O{sub 5} by hydrogen at 800 K. In the second step the V{sub 2}O{sub 3} is reduced and carburized by methane with production of CO at 1180 K. In the early stages, the synthesis is found to be limited by the activation of hydrogen as found from experiments with Pt/V{sub 2}O{sub 5}. The transformation is accompanied by retention of external shape and size, and so is psuedomorphic, but does not conserve orientation of crystallographic planes, so is not topotactic. The results are compared and contrasted to those of nitridation with ammonia and reduction by pure hydrogen.

• OSTI ID: 283010
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 120; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CHEMICAL PREPARATION
REDUCTION
STRUCTURAL CHEMICAL ANALYSIS
SURFACE AREA
VANADIUM CARBIDES
X-RAY DIFFRACTION