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Preparation, Characterization and Catalytic Activity of Niobium Oxynitride and Oxycarbide in Hydrotreatment

Published online by Cambridge University Press:  15 February 2011

H. S. Kim ,
C. Sayag ,
G. Bugli ,
G. Djega-Mariadassou  and
M. Boudart
H. S. Kim
Affiliation:
Université P&M Curie, Laboratoire Réactivité de Surface, CNRS URA 1106, 4, Place Jussieu, Case 178, 75252 Paris Cedex 05, France
C. Sayag
Affiliation:
Université P&M Curie, Laboratoire Réactivité de Surface, CNRS URA 1106, 4, Place Jussieu, Case 178, 75252 Paris Cedex 05, France
G. Bugli
Affiliation:
Université P&M Curie, Laboratoire Réactivité de Surface, CNRS URA 1106, 4, Place Jussieu, Case 178, 75252 Paris Cedex 05, France
G. Djega-Mariadassou
Affiliation:
Université P&M Curie, Laboratoire Réactivité de Surface, CNRS URA 1106, 4, Place Jussieu, Case 178, 75252 Paris Cedex 05, France
M. Boudart
Affiliation:
Stanford University, Laboratory of Chemical Engineering, Stanford, CA 94305
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Abstract

Oxynitride and oxycarbide of niobium present metallic and acidic catalytic functions as evidenced by molecular probe reactions: isomerization of cyclohexane and hydrodenitrogenation of 1–4 tetrahydroquinoline. The proximity of the two functions leads to the concept of “dual site” by selective inhibition of the metallic and acid sites. Substitution of nitrogen of the oxynitride by carbon to form the oxycarbide produces a large enhancement of the metallic character of the surface. The oxynitride was shown to present a more acidic and a less hydrogenating activity as compared to the activity of the oxycarbide. Both compounds of niobium have been compared to molybdenum oxynitride.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 368: Symposium T – Synthesis and Properties of Advanced Catalytic Materials , 1994 , 3
Copyright
Copyright © Materials Research Society 1995

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References

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