Abstract
Early transition metals (groups 4 to 6) do not catalyze hydrocarbon conversion reactions but their nitrides and carbides are found to behave like precious metals. In the case of clean tungsten carbide surfaces (i.e. free of surface oxygen and polymeric carbon) prepared at high temperature (HT) (870 to 1070 K), catalytic dehydrogenation and hydrogenolysis reactions of alkanes and hydrogenation of alkenes are observed [1, 2]. More generally, early transition metal carbides and nitrides are good catalysts for reactions characteristic of noble metals. Chemisorption of oxygen modifies the surface properties of carbides or nitrides [1–4.] Chemisorbed oxygen inhibits hydrogenolysis [1, 2] and introduces acidic isomerization function on tungsten carbide surfaces [1, 2]. It appears that oxygen-exposed tungsten carbides possess a bifunctional surface that catalyzes both dehydrogenation and carbenium ion reactions typically occurring on reforming catalysts [3]. These findings are not unique to tungsten carbides and depend on the preparation of materials.
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Djéga-Mariadassou, G. (1998). Alkane Activation by Pseudo-Metals. In: Derouane, E.G., Haber, J., Lemos, F., Ribeiro, F.R., Guisnet, M. (eds) Catalytic Activation and Functionalisation of Light Alkanes. NATO ASI Series, vol 44. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0982-8_13
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DOI: https://doi.org/10.1007/978-94-017-0982-8_13
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