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  • 1
    Electronic Resource
    Electronic Resource
    High yields of synthesis gas by millisecond partial oxidation of higher hydrocarbons (2000)
    Springer
    Catalysis letters 70 (2000), S. 99-107 
    Details
    ISSN: 1572-879X
    Keywords: syngas ; millisecond partial oxidation ; Rh-monolith reactor ; hydrocarbon fuels ; isooctane ; gasoline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cyclohexane, n-hexane, and isooctane were reacted with air in a Rh-monolith reactor and converted into synthesis gas (H2+CO) in yields exceeding 90%, with 〉95% conversion of fuels and 100% conversion of oxygen. The best catalyst was an 80 ppi washcoated alumina monolith containing 5 wt% Rh. There was a small effect of catalyst contact time on syngas selectivity and conversions for gas space velocities from 3×105 to 3×106 h−1. Preheating the feed enhances syngas selectivities slightly, but no reactor preheat is necessary provided the fuel remains vaporized. Addition of 25 mol% toluene to isooctane also produces syngas, olefins, and methane with 90% yield, including ∼70% yield to syngas. Partial oxidation of gasoline–air mixtures was attempted but the catalysts were poisoned after several hours, probably by sulfur and/or metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018825015184
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On‐line addition of catalyst in high‐temperature reactors: high selectivity to olefins (1999)
    Springer
    Catalysis letters 63 (1999), S. 113-120 
    Details
    ISSN: 1572-879X
    Keywords: Pt/Al2O_3 catalyst ; on‐line Pt addition ; high‐temperature reactor ; catalyst promoters ; catalytic performance ; ethane oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract By adding solutions containing catalyst salts to hot monolith catalysts during partial oxidation processes, the salt decomposes instantly and is deposited selectively near the front face. We have used this technique to deposit extremely small amounts of Pt on α-Al2O3 monoliths during ethane oxidation to olefins. We find that on this catalyst with H2 addition, the selectivity to ethylene rises from ∼ to over 80% at an ethane conversion of ∼60% and at complete O2 conversion. We also examine the addition of promoters including Sn, which gives improved performance compared to the Pt catalyst alone. This appears to be a general effect that could be useful in preparing catalysts with different loadings and distributions in high‐temperature processes. It can also be used for rapid and accurate diagnosis of catalysts and additives and to modify catalysts on‐line in situations where deactivation or catalyst loss occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019064920774
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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