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Catalytic Properties of Vanadium Nitride and the Effect of Preparative Parameters on its Microstructure

Published online by Cambridge University Press:  10 February 2011

Heock-Hoi Kwon  and
Levi T. Thompson
Heock-Hoi Kwon
Affiliation:
University of Michigan, Department of Chemical Engineering, Ann Arbor, MI 48109–2136
Levi T. Thompson
Affiliation:
University of Michigan, Department of Chemical Engineering, Ann Arbor, MI 48109–2136
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Abstract

In this paper we describe the synthesis, morphologies, and catalytic properties of vanadium nitrides prepared via the temperature programmed reaction (TPR) of V2O5 (7 m2/gr) with ammonia. This reaction yielded VN with surface areas up to 60 m2/gr. Among the synthesis parameters, the molar hourly space velocity had the most significant influence on the BET surface areas, crystallite sizes, and pore size distributions. Thermal gravimetric analysis (TGA) and x-ray diffraction indicated that the solid state reaction of V2O5 with NH3 occurred as follows: V2O5 → V4O9 → VO2 → V2O3 → VO0.9 → V.N. Scanning electron microscopy revealed that the surface roughness increased as the transformation proceeded, which corresponds to the increase in surface area. The vanadium nitrides were exceptionally active for the dehydrogenation of butane with selectivities greater than 98 % to C4 olefins. The deactivation was very slow for these catalysts. The reaction rates increased with increasing surface area and were comparable to that of a commercial Pt-Sn/Al2O3 dehydrogenation catalyst.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 454: Symposium S – Advanced Catalytic Materials–1996 , 1996 , 65
Copyright
Copyright © Materials Research Society 1997

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References

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