Catalysis Letters

, Volume 38, Issue 1–2, pp 95–99 | Cite as

Molybdenum based catalysts. I. MoO2 as the active species in the reforming of hydrocarbons

  • A. Katrib
  • P. Leflaive
  • L. Hilaire
  • G. Maire


The XPS spectra of bulk MoO2 and MoO3 are reported. Commercial MoO2 reveals the presence of multilayers of MoO3 covering bulk MoO2. In situ reduction of bulk MoO3 by H2 at temperatures equal to 623 K and less than 673 K reduces the superficial layer(s) to mainly MoO2. Such phase is characterised by a certain density of states in terms of the free 4d, 5s electrons localised mainly on the Mo atoms and observed in the valence band energy region at the Fermi-level in the XP spectrum of this system. Catalytic reactions on the MoO2 phase of 2-methylpentane at atmospheric pressure using a mixture of the hydrocarbon (5 Torr) with hydrogen (755 Torr) yield 3-methylpentane andn-hexane as the main products in roughly equal amounts. These results are interpreted in terms of dual sites on the MoO2 surface.


molybdenum dioxide XPS argon ion bombardment reforming of alkanes 


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  1. [1]
    J.M. Muller and F. Gault, Bull. Soc. Chim.(1970)416.Google Scholar
  2. [2]
    R.B. Levy and M. Boudart, Science 181 (1973) 547.Google Scholar
  3. [3]
    A. Frennet, G. Leclercq, L. Leclercq, G. Maire et al., in:Proc. 10th Int. Congr. on Catalysis, Budapest, 19–24 July 1992, eds. L. Guczi, F. Solymosi and P. Tétényi (Elsevier, Amsterdam, 1993) p. 927.Google Scholar
  4. [4]
    M.J. Ledoux, C. Pham-Huu, J. Guille and H. Dunlop, J. Catal. 134 (1992) 399.Google Scholar
  5. [5]
    L. Leclercq, M. Provost, H. Pastor, J. Grimblot, A.M. Hardy, L. Gengembre and G. Leclercq, J. Catal. 117 (1989) 371.Google Scholar
  6. [6]
    F.H. Ribeiro, M. Boudart, R.A. Dalla Betta and E. Iglesia, J. Catal. 130 (1991) 498.Google Scholar
  7. [7]
    C. Pham-Huu, M.J. Ledoux and J. Guille, J. Catal. 143 (1993) 249.Google Scholar
  8. [8]
    A. Katrib, F. Hemming, P. Wehrer, L. Hilaire and G. Maire, Catal. Let. 29 (1994) 397.Google Scholar
  9. [9]
    F. Hemming, Thesis, Université Louis Pasteur, Strasbourg, France (1995).Google Scholar
  10. [10]
    A. Katrib, F. Hemming, P. Wehrer, L. Hilaire and G. Maire, J. Electron. Spectry. Rel. Phenom., in press.Google Scholar
  11. [11]
    R.J. Colton, A.M. Guzman and J.W. Rabalais, J. Appl. Phys. 49 (1978) 409.Google Scholar
  12. [12]
    F. Werfel and E. Minni, J. Phys. C 16 (1983) 6091.Google Scholar
  13. [13]
    A. Katrib, J. Electron. Spectry. Rel. Phenom. 18 (1980) 275.Google Scholar
  14. [14]
    C.D. Wagner, W.M. Riggs, L.E. Davis, J.F. Moulder and G.E. Muilenberg,Handbook of X-ray Photoelectron Spectroscopy (Perkin-Ehner Corp., Eden Prairie, 1978).Google Scholar
  15. [15]
    D.S. Zingg, L.E. Makovsky, R.E. Tischer, F.R. Brown and D.M. Hercules, J. Phys. Chem. 84 (1980) 2898.Google Scholar
  16. [16]
    F. Garin, V. Keller, R. Ducros and G. Maire, J. Catal., accepted (1995) (Part III).Google Scholar
  17. [17]
    R. Nakamura, D. Pioch, R.G. Browman and R.L. Burwell. J. Catal. 93 (1985) 388.Google Scholar

Copyright information

© J.C. Baltzer AG, Science Publishers 1996

Authors and Affiliations

  • A. Katrib
    • 1
  • P. Leflaive
    • 1
  • L. Hilaire
    • 1
  • G. Maire
    • 1
  1. 1.LERCSI-URA 1498 CNRS-ULP-EHICSStrasbourg CedexFrance

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