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Synthesis of a Mo/Nb mixed carbide

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Abstract

Molybdenum and niobium carbides (β−Mo2C, NbC), as well as mixed carbides of molybdenum and niobium, were synthesized by the temperature-programmed carburization method (TPC) using a 20 vol% CH4/H2 gas mixture. The starting materials were MoO3, B-Nb2O5, and physical mixtures of B-Nb2O5/MoO3 with Nb/(Nb + Mo) atomic ratios varying from 0.2 to 0.8, respectively. Results from catalytic and temperatureprogrammed oxidation (TPO) measurements indicate that during the carburization of the Nb2O5/MoO3 physical mixture with Nby(Nb + Mo) = 0.8 there is, besides β−Mo2C and NbC formation, the appearance of a carbidic phase not detectable by x-ray diffraction (XRD). This phase appears to be highly active and selective for the dibenzothiophene hydrodesulfurization (HDS) reaction.

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Authors and Affiliations

  1. NUCAT/PEQ/COPPE/Universidade Federal do Rio de Janeiro, Caixa Postal 68502, RJ-21945-970, Rio de Janeiro, Brazil

    V. L. S. Teixeira da Silva

  2. Environmental Catalysis and Materials Laboratory, Department of Chemical Engineering, Virginia Polytechnic Institute & State University, Blacksburg, 24061, Virginia, USA

    V. L. S. Teixeira da Silva, M. Schmal, V. Schwartz & S. T. Oyama

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  1. V. L. S. Teixeira da Silva
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  2. M. Schmal
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  3. V. Schwartz
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  4. S. T. Oyama
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Teixeira da Silva, V., Schmal, M., Schwartz, V. et al. Synthesis of a Mo/Nb mixed carbide. Journal of Materials Research 13, 1977–1988 (1998). https://doi.org/10.1557/JMR.1998.0278

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  • DOI: https://doi.org/10.1557/JMR.1998.0278

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