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  • molybdenum dioxide  (1)
  • oxygen  (1)
  • Springer  (2)
  • EDP Sciences
  • 1
    Electronic Resource
    Electronic Resource
    Catalytic activity and XPS surface determination of tungsten carbide for hydrocarbon reforming. Influence of the oxygen (1995)
    Springer
    Catalysis letters 35 (1995), S. 65-74 
    Details
    ISSN: 1572-879X
    Keywords: tungsten carbide ; oxygen ; alkane reforming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The influence of oxygen on the catalytic properties of tungsten carbide has been studied for the reforming reaction of 2-methylpentane in a great excess of hydrogen $$\left( {P_{H_2 } /P_{HC} = 150} \right)$$ . The oxygen surface concentration has been measured by the ratio of the signal area of the O1s and the W4f levels as determined by X-ray photoelectron spectroscopy. Two kinds of processes are observed: cracking and isomerization reactions. The introduction of oxygen at T=350°C leads to a deep decrease of the cracking reaction kinetics; about two orders of magnitude. The tungsten carbide, strongly selective for cracking reactions in absence of oxygen, becomes very selective for isomer production in the presence of oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807005
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  • 2
    Electronic Resource
    Electronic Resource
    Molybdenum based catalysts. I. MoO2 as the active species in the reforming of hydrocarbons (1996)
    Springer
    Catalysis letters 38 (1996), S. 95-99 
    Details
    ISSN: 1572-879X
    Keywords: molybdenum dioxide ; XPS ; argon ion bombardment ; reforming of alkanes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806906
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