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  • 1
    Electronic Resource
    Electronic Resource
    The oxidative coupling of methane and the activation of molecular O2 on CeO2/BaF2 (1994)
    Springer
    Catalysis letters 29 (1994), S. 177-188 
    Details
    ISSN: 1572-879X
    Keywords: OCM ; metal oxide-fluoride ; electron-enriched lattice oxygen ; quasi-free electrons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CeO2/BaF2 was used as the catalyst for the oxidative coupling of methane (OCM). At 800°C and CH4∶O2=2.7∶1,CH4 conversion of 34% with C2 hydrocarbon selectivity of 54.3% was obtained. XRD measurement showed that partial anion (O2−,F−) and/or cation (Ce4+,Ba2+) exchange between CeO2 and BaF2 lattices occurred. ESR study showed that O− species existed on degassed catalyst. XPS study revealed that, when BaF2 was added to CeO2, the binding energy of Be 3d5/2 was 2.2 eV lower than that in CeO2, and the “electron-enriched lattice oxygen” species was detected. XPS, ESR and Raman study showed that, under O2 adsorbing conditions, O 2 2− and O − 2 species were detected on CeO2/BaF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814264
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The activation of O2 and the oxidative dehydrogenation of C2H6 over SmOF catalyst (1996)
    Springer
    Catalysis letters 40 (1996), S. 101-104 
    Details
    ISSN: 1572-879X
    Keywords: ethane oxidative dehydrogenation ; O2 activation ; SmOF ; dioxygen species and mono-oxygen species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The activation of O2 over SmOF was studied by in situ laser Raman spectrometry and temperature programmed desorption (TPD). When the hydrogen- and helium-treated (1 h for each gas at 973 K) SmOF sample was cooled to 303 K in oxygen, Raman bands which correspond to the existence of O 2 2− , O 2 n− (2 〉n 〉 1), O 2 − and O 2 δ- (1 〉δ 〉 0) species were observed. From 303 to 973 K, there was no O2 desorption but the Raman bands observed at 303 K reduced in intensity and vanished completely at 973 K, even though the sample was under an atmosphere of oxygen. We suggest that as the sample temperature increased, dioxygen species were converted to mono-oxygen species such as O− which were undetectable by Raman spectrometry. O2 desorption occurred above 973 K, giving a TPD-peak at 1095 K. When C2 H6 was pulsed over the sample pretreated with oxygen and helium at 973 K, C2H4 selectivity was 91.8%. We conclude that the mono-oxygen species is responsible for the oxidative dehydrogenation of ethane to ethene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807464
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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