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  • 1
    Electronic Resource
    Electronic Resource
    Mechanism for the formation of carbon dioxide in the catalytic oxidation of carbon monoxide and methane on silica (1992)
    Springer
    Catalysis letters 13 (1992), S. 283-288 
    Details
    ISSN: 1572-879X
    Keywords: Silica ; oxidation ; methane ; carbon monoxide ; carbon dioxide ; labelled reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidation of carbon monoxide to carbon dioxide is shown to be catalyzed at 850 K or above over almost all lattice oxygen atoms on the surface of silica prepared by the sol-gel method from ethyl orthosilicate under conditions which yield high selectivity to carbon dioxide in the oxidation of methane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771001
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  • 2
    Electronic Resource
    Electronic Resource
    Synergistic effects in the oxidation of methane on strontium and lead hydroxyapatites (1999)
    Springer
    Catalysis letters 57 (1999), S. 161-165 
    Details
    ISSN: 1572-879X
    Keywords: methane ; oxidation ; strontium hydroxyapatite ; lead hydroxyapatite ; tetrachloromethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidation of methane has been investigated on lead hydroxyapatite (PbHAp), strontium hydroxyapatite (SrHAp) and their binary mixtures at 873 K. PbHAp showed no activity for the oxidation of methane, while SrHAp produced carbon monoxide selectively at 2–4% conversion. On binary mixtures of the hydroxyapatites the conversion of methane and the selectivity to C2 compounds reached values higher than those of the separate constituents of the mixture. With tetrachloromethane in the feed stream a similar synergistic effect was observed with conversions of methane and selectivities to CH3Cl higher on the binary mixtures than those on either SrHAp or PbHAp. The strontium-containing hydroxyapatite appears to play a crucial role in the activation of methane, while the presence of the lead-containing analogue is apparently required for the minimization of undesirable processes involving methyl radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019024421857
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of chlorine species over magnesium oxide in the oxidative coupling of methane in the presence of carbon tetrachloride (1994)
    Springer
    Catalysis letters 25 (1994), S. 201-208 
    Details
    ISSN: 1572-879X
    Keywords: methane ; carbon tetrachloride ; magnesium oxide ; magnesium chloride ; oxidative coupling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidative coupling of methane on magnesium oxide (MgO) has been studied in the presence of carbon tetrachloride (TCM) as a gas-phase additive. Addition of a small amount of TCM to the reactant stream improves the selectivity to C2H4, while the conversion of methane is not influenced by the additive. X-ray photoelectron spectra of the used MgO reveal the formation of chlorine species on the catalyst surface in quantities up to 0.20 of Cl/Mg (atomic ratio), although X-ray diffraction spectra of the catalyst show MgO only and the content of the chlorine species in the bulk phase estimated by X-ray fluorescence analysis is very low. It is concluded that the enhancement of the selectivity to C2H4 primarily results from the presence of surface chlorine species. The chlorinated species on the catalyst has been identified as MgCl2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00816301
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  • 4
    Electronic Resource
    Electronic Resource
    An apparent ensemble effect in the oxidative coupling of methane on hydroxyapatites with incorporated lead (1994)
    Springer
    Catalysis letters 30 (1994), S. 235-240 
    Details
    ISSN: 1572-879X
    Keywords: oxidative coupling ; methane ; ensemble effect ; hydroxyapatites ; lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The introduction of small quantities of lead into calcium hydroxyapatite catalysts produces marked increases in the selectivity to C2+ hydrocarbons, while the conversion of methane remains relatively constant. Small surface concentrations of lead are sufficient to achieve C2+ selectivities of 80 and 90%, with oxygen and nitrous oxide, respectively, in contrast with 18 and 46%, respectively, obtained in the absence of lead. Since surface concentration of lead species sufficient to stabilize pairs of methyl radicals in close proximity to each other would be expected to facilitate the formation of C2 hydrocarbons, an ensemble effect appears to be extant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813689
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