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  • 1
    ISSN: 1572-879X
    Keywords: Methane partial oxidation ; carbon deposition ; kinetic barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The deposition of carbon on catalysts during the partial oxidation of methane to synthesis gas has been investigated and it has been found that the relative rate of carbon deposition follows the order Ni〉Pd〉Rh〉Ir. Methane decomposition was found to be the principal route for carbon formation over a supported nickel catalyst, and electron micrographs showed that both “whisker” and “encapsulate” forms of carbon are present on the catalyst. Negligible carbon deposition occurred on iridium catalysts, even after 200 h.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: supported molybdenum carbide ; methane dry reforming ; syngas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dry reforming of methane at elevated pressure over supported molybdenum carbide catalysts, prepared from oxide precursors using ethane TPR, has been studied. The relative stability of the catalysts is Mo2C/Al2O3〉Mo2C/ZrO2〉Mo2C/SiO2〉Mo2C/TiO2, and calcination of the oxide precursor for short periods was found to be beneficial to the catalyst stability. Although the support appears to play no beneficial role in the methane dry reforming reaction, the alumina-supported material was stable for long periods of time; this may be important for the production of pelletised industrial catalysts. The evidence suggests that the differences in the stabilities may be due to interaction at the precursor stage between MoO3 and the support, while catalyst deactivation is due to oxidation of the carbide to MoO2, which is inactive for methane dry reforming.
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  • 3
    ISSN: 0044-2313
    Keywords: Iridium ; ruthenium ; sodium ; calcium ; oxygen ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Strukturen und Charakterisierung von zwei neuen Oxiden vom Sr4PtO6-Typ: NaCa3IrO6 und NaCa3RuO6NaCa3IrO6 (I) und NaCa3RuO6 (II) kristallisieren mit trigonaler (rhomboedrischer) Symmetrie in der Raumgruppe R3c, Z = 6, I: a = 9,272(3) Å, c = 11,214(1) Å, II: a = 9,244(3) Å, c = 11,201(1) Å. I und II sind isotyp zu Verbindungen vom Sr4PtO6-Typ. Die Strukturen wurden mittels Röntgen-Einkristallstrukturanalyse gelöst mit einem R-Wert von 0,032 und Rw = 0,039 für I bzw. R = 0,024 und Rw = 0,031 für II. Die Struktur besteht aus unendlichen Ketten von flächenverknüpften MO6-Oktaedern mit M=Ir bzw. Ru und trigonalen Prismen von NaO6. Die Ketten sind getrennt durch Calcium-Kationen.
    Notes: NaCa3IrO6 (I) and NaCa3RuO6 (II) crystallize with trigonal (rhombohedral) symmetry in the space group R3c, Z = 6, for I a = 9.272(3) Å, c = 11.214(1) Å; for II a = 9.244(3) Å, c = 11.201(1) Å. NaCa3IrO6 (I) and NaCa3RuO6 (II) are isotypic to compounds of the Sr4PtO6 structure type. The structures have been solved by means of single crystal X-ray diffraction data analysis with the reliability factors for I of R = 0.032 and Rw = 0.039; and the the reliability factors for II of R = 0.024 and Rw = 0.031. The structure consists of infinite chains of alternating face-sharing MO6 octahedra, where M=Ir or Ru, and NaO6 trigonal prisms. The chains are separated by the calcium cations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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