Hostname: page-component-7dd5485656-7jgsp Total loading time: 0 Render date: 2025-10-31T22:11:24.825Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis of a Mo/Nb mixed carbide

Published online by Cambridge University Press:  31 January 2011

V. L. S. Teixeira da Silva ,
M. Schmal ,
V. Schwartz  and
S. T. Oyama
V. L. S. Teixeira da Silva
Affiliation:
NUCAT/PEQ/COPPE/Universidade Federal do Rio de Janeiro, Caixa Postal 68502, Rio de Janeiro, RJ-21945-970, Brazil, and Environmental Catalysis and Materials Laboratory, Department of Chemical Engineering, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
M. Schmal
Affiliation:
NUCAT/PEQ/COPPE/Universidade Federal do Rio de Janeiro, Caixa Postal 68502, Rio de Janeiro, RJ-21945-970, Brazil
V. Schwartz
Affiliation:
Environmental Catalysis and Materials Laboratory, Department of Chemical Engineering, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
S. T. Oyama
Affiliation:
Environmental Catalysis and Materials Laboratory, Department of Chemical Engineering, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061
Get access

Extract

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.

Information

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1977 - 1988
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

1.Berthollet, C. L., Vandermonde, A. A., and Monge, G., Mém. Acad. Sci. 132 (1786).Google Scholar
2.The Chemistry of Transition Metal Carbides and Nitrides, edited by Oyama, S. T. (Blackie Academic and Professional, London, 1996).CrossRefGoogle Scholar
3.Levy, R. B. and Boudart, M., Science 181, 547 (1973).Google Scholar
4.Oyama, S. T., Ph.D. Dissertation, Stanford University, Stanford, CA (1981).Google Scholar
5.Volpe, L. and Boudart, M., J. Solid State Chem. 52, 332 (1985).CrossRefGoogle Scholar
6.Volpe, L., Oyama, S. T., and Boudart, M., in Preparation of Catalysts III, edited by Poncelet, G., Grange, P., and Jacobs, P. A. (Elsevier, Amsterdam, 1983), p. 147.Google Scholar
7.Volpe, L. and Boudart, M., J. Solid State Chem. 52, 348 (1985).Google Scholar
8.Volpe, L. and Boudart, M., J. Phys. Chem. 90, 643 (1986).CrossRefGoogle Scholar
9.Vidick, B., Lemaître, J., and Leclercq, L., J. Catal. 67, 643 (1986).Google Scholar
10.Saito, M. and Anderson, R. B., J. Catal. 67, 296 (1981).Google Scholar
11.Ribeiro, F. H., Dalla Betta, R., Boudart, M., and Eglesia, E., J. Catal. 130, 523 (1991).Google Scholar
12.Markel, E. J. and Van Zee, J. W., J. Catal. 126, 643 (1990).CrossRefGoogle Scholar
13.Abe, H. and Bell, A. T., Cat. Lett. 18, 1 (1993).CrossRefGoogle Scholar
14.Sajkowsky, D. J. and Oyama, S. T., Preprints, Division of Petroleum Chemistry, Symposium on the “The Chemistry of W/Mo Catalysts” (199th ACS National Meeting, Boston, MA, April 22–27, 1988), p. 233.Google Scholar
15.Lee, J. S., Oyama, S. T., and Boudart, M., J. Catal. 106, 125 (1987).CrossRefGoogle Scholar
16.Oyama, S. T. and Haller, G. L., Catalysis, Spec. Period. Rep. 5, 333 (1981).Google Scholar
17.Leclercq, L., in Surface Properties and Catalysis by Non-Metals, edited by Bonenelle, J. P. (Reidel, New York, 1983).Google Scholar
18.Ramanathan, S., Teixeira da Silva, V. L. S., and Oyama, S. T., Preprints, Division of Petroleum Chemistry, Symposium on Advances in Hydrotreating Catalysts (208th ACS National Meeting, August 21–25, Washington, DC, 1994), p. 618.Google Scholar
19.Schlatter, J. C., Oyama, S. T., Metcalfe, J. E., and Lambert, J. M. Jr., Ind. Eng. Chem. Res. 27, 1648 (1988).Google Scholar
20.Nagai, M. and Miyao, T., Cat. Lett. 15, 105 (1992).CrossRefGoogle Scholar
21.Lee, K. S., Abe, H., Reimer, J. A., and Bell, A. T., J. Catal. 139, 34 (1993).CrossRefGoogle Scholar
22.Choi, J. G., Brener, J. R., Cooling, C. W., Demczyk, B. G., Dunning, D. L., and Thompson, L., Catal. Today 15, 201 (1992).Google Scholar
23.Nagai, M., Miyao, M., and Toboi, T., Cat. Lett. 18, 9 (1993).CrossRefGoogle Scholar
24.Teixeira da Silva, V. L. S., D.Sc. Dissertation Thesis, Programa de Engenharia Química, COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil (1994).Google Scholar
25.Oyama, S. T., Catal. Today 15, 179 (1992).CrossRefGoogle Scholar
26.Brunauer, S., Emmett, P. H., and Teller, E., J. Am. Chem. Soc. 60, 309 (1938).CrossRefGoogle Scholar
27.Ramanathan, S. and Oyama, S. T., J. Phys. Chem. 99, 16,365 (1995).CrossRefGoogle Scholar
28.Teixeira da Silva, V. L. S., Schmal, M., and Oyama, S. T., J. Solid State Chem. 123, 168 (1996).Google Scholar
29.Teixeira da Silva, V. L. S., Ko, E. I., Schmal, M., and Oyama, S. T., Chem. Mater. 7 (1), 179 (1995).CrossRefGoogle Scholar
30.Oyama, S. T., Schlatter, J. C., Metcalfe, J. E., and Lambert, J. M. Jr., Ind. Eng. Chem. Res. 27, 1639 (1988).CrossRefGoogle Scholar
31.Boudart, M., Oyama, S. T., and Volpe, L., U.S. Patent 4,515,763, assigned to Stanford University (1985).Google Scholar
32.Kojima, I., Orita, M., Miyazaki, E., and Otani, S., Surf. Sci. 160, 153 (1985).Google Scholar
33.Boudart, M., Oyama, S. T., and Leclercq, L., Proceedings of the 7th International Congress on Catalysis, edited by Seyama, T. and Tanabe, K., Kodansha (1980), Vol. 1, p. 518.Google Scholar
34.Yu, C. C., Ramanathan, S., Sherif, F., and Oyama, S. T., J. Phys. Chem. 98, 13,038 (1994).Google Scholar
35.Yu, C. C., Ramanathan, S., Dhandapani, B., Chen, J. G., and Oyama, S. T., J. Phys. Chem. B 101, 512 (1997).Google Scholar