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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and characterization of rare earth orthovanadates for propane oxidative dehydrogenation (1996)
    Springer
    Catalysis letters 37 (1996), S. 241-246 
    Details
    ISSN: 1572-879X
    Keywords: rare earth orthovanadates ; citrate method ; propane oxidative dehydrogenation ; redox property
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract High purity rare earth orthovanadates (REVO4), YVO4, LaVO4, CeVO4, NdVO4, SmVO4 and EuVO4, were prepared by the citrate method. XRD, FT-IR, LRS and TPR techniques were employed to characterize these orthovanadates. The catalytic performance of SmVO4, LaVO4 and YVO4 in the oxidative dehydrogenation of propane can compete with that of Mg3V2O8. The selectivity of propene over CeVO4, NdVO4 and EuVO4 was relatively lower. The correlation between the reducibility and the selectivity of the catalysts implied that the V4+/V3+ couple might be involved in the dehydrogenation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807761
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pulse study of methane partial oxidation to syngas over SiO2-supported nickel catalysts (1996)
    Springer
    Catalysis letters 41 (1996), S. 159-163 
    Details
    ISSN: 1572-879X
    Keywords: methane oxidation ; syngas ; SiO2-supported nickel (Ni/SiO2) ; deuterium isotope effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction behaviors of CH4/O2 (2/1) with unreduced and reduced SiO2-supported nickel (10 wt% metal) catalysts were investigated in a pulse micro-reactor at temperatures ranging from 600 to 800° C. In the interaction of CH4/O2 with unreduced NiO/SiO2, the products are exclusively CO2 and H2O at or below 700°C. At 800° C, besides CO2 and H2O, CO and H2 are formed. The reactivity at 800°C can be ascribed to the net generation of metallic nickel site at this temperature. In the reaction of CH4/O2 over reduced Ni/SiO2, the main products are CO and H2 with CO2 and H2O being the minor ones. The results indicate metallic nickel is the active site for methane partial oxidation to syngas. Normal deuterium isotope effects of similar magnitude were observed on the overall, as well as on the CO and CO2 formation reactions with insignificant change in the product selectivities when CD4 was used instead of CH4, indicating that methane dissociation is a key step and that CO and CO2 are formed via some common intermediates which are subject to kinetic deuterium isotope effect. The results of deuterium isotope effects can be reasonably explained based on the methane pyrolysis mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811484
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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