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  • 1
    Digitale Medien
    Digitale Medien
    Role of lattice oxygen during CO2 reforming of methane over NiO/MgO solid solutions (1998)
    Springer
    Catalysis letters 51 (1998), S. 183-185 
    Details
    ISSN: 1572-879X
    Schlagwort(e): CH4 ; CO2 ; Ni ; MgO ; lattice oxygen ; transient response
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The CO2 reforming of methane over reduced NiO/MgO solid solution catalysts was studied at 800°C by a novel transient method, which couples a broadened pulse of CH4/CO2 with a step change to the carrier gas and/or with a sharp isotopic pulse of either 18O4, CO18 2 or 13CO16 2. The response curves indicated that two kinds of oxygen were formed over the catalysts during reaction: adsorbed oxygen which reacts fast with C species and lattice oxygen which reacts more slowly with C species. One concludes that a redox cycle of lattice oxygen formation through the oxidation of Ni and its reaction with C species takes place on the catalyst surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019030311127
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  • 2
    Digitale Medien
    Digitale Medien
    Isotopic study of the reaction of methane with the lattice oxygen of a NiO/MgO solid solution (1999)
    Springer
    Catalysis letters 57 (1999), S. 167-169 
    Details
    ISSN: 1572-879X
    Schlagwort(e): CD4 ; CH4 ; GC-MS ; lattice oxygen ; NiO ; MgO ; solid solution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The reaction between methane and the lattice oxygen of a NiO/MgO (1/1.85) solid solution was investigated by an isotopic pulse-GCMS method. During a single-pulse reaction of CH4/CD4 (1/1) with the lattice oxygen, besides CH4, CD4, carbon monoxide and water, very small amounts of CHD3, CH2D2 and CH3D were detected in the exit gas. Because the isotopic kinetic effect (KH/KD) was 1.01, the dissociation of CH4 cannot constitute the rate-determining step. The rate-determining step is the reaction with the lattice oxygen, because of the high stability of the lattice oxygen in the NiO/MgO solid solutions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019072305019
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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