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  • 1
    Electronic Resource
    Electronic Resource
    Cation effects in the oxidative dehydrogenation of methane on sulphates (1992)
    Springer
    Catalysis letters 13 (1992), S. 143-152 
    Details
    ISSN: 1572-879X
    Keywords: Methane ; conversion ; oxidative dehydrogenation ; cations ; sulphates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidative coupling of methane has been studied on Mg, Ca, Sr and Ba sulphate. The conversions and selectivities are found to be dependent on the nature of the cation and to be approximately correlated with their electronegativities, thus implying that the C-H bond scission in CH4, at least with these catalysts, is heterolytic, is rate determining, and further, that the formation of C2+ hydrocarbons is dependent, among other factors, on the concentration of methyl radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770957
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The stability of 12-molybdosilicic, 12-tungstosilicic, 12-molybdophosphoric and 12-tungstophosphoric acids in aqueous solution at various pH (1995)
    Springer
    Catalysis letters 34 (1995), S. 237-244 
    Details
    ISSN: 1572-879X
    Keywords: metal-oxygen cluster compounds ; heteropoly acids ; stability ; pH ; aqueous solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The stabilities of the solid superacids H3Mo12O40, H3PW12O40, H4SiMo12O40 and H4SiW12O40 in aqueous solution have been measured at various values of pH by use of ion chromatographic analyses. The aforementioned acids are completely decomposed at values of pH, 4.0, 5.2, 7.0 and 11.0, respectively. The stabilities in aqueous solution with respect to pH follow the order H4SiW12O40 〉 H3PW12O40 〉 H4SiMo12O40 〉 H3PMo12O40.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808338
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The low-temperature oxidative coupling of methane over zirconium oxide (1992)
    Springer
    Catalysis letters 16 (1992), S. 389-398 
    Details
    ISSN: 1572-879X
    Keywords: Methane ; oxidative dehydrogenation ; zirconium oxide ; hydroxyl ; steaming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Zirconium oxide is shown to be capable of catalyzing the conversion of methane to ethane at temperatures as low as 530 °C. The lowest temperature at which ethane is produced is found to be dependent upon the method employed for the preparation of the catalyst. The presence of surface hydroxyl groups appears to be necessary for the production of ethane at these low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764896
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    Paper (German National Licenses)
    Fulltext
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