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  • Articles: DFG German National Licenses  (3)
  • 14C-1-pentanol  (1)
  • Mössbauer  (1)
  • Pt-Sn catalyst  (1)
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  • Articles: DFG German National Licenses  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural studies of Pt-Sn catalysts on high and low surface area alumina supports (1990)
    Springer
    Catalysis letters 4 (1990), S. 303-308 
    Details
    ISSN: 1572-879X
    Keywords: Pt-Sn catalyst ; bimetallic catalyst on alumina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract For a series of catalysts containing 1 wt. % Pt and Sn∶Pt ratios ranging from ca. 1 to 8, the only crystalline alloy phase detected by XRD was SnPt (1∶1). The XRD intensity of lines for the SnPt (1∶1) alloy phase increase with increasing Sn∶Pt ratios, indicating the presence of unalloyed Pt in the samples containing low tin loadings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00765315
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fischer-Tropsch synthesis. Evidence for two chain growth mechanisms (1990)
    Springer
    Catalysis letters 7 (1990), S. 127-140 
    Details
    ISSN: 1572-879X
    Keywords: Fischer-Tropsch synthesis ; radioisotope, tracer study ; mechanism, Fischer-Tropsch synthesis ; kinetics, Fischer-Tropsch synthesis ; chain growth, Fisher-Tropsch synthesis,14C, tracer studies ; 14C-ethanol ; 14C-1-pentanol ; reactor, CSTR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results show that n-pentanol serves to initiate Fischer-Tropsch synthesis reactions. Product accumulation in the CSTR is not adequate to explain the deviation from a constant14C activity/mole with increasing carbon number for alkane products. A second Fischer-Tropsch synthesis mechanism that produces only alkanes is needed to explain the deviation of the C activity/mole with increasing carbon number for n-alkanes. Furthermore, the two chain growth pathways must be completely independent without the possibility of a carbon number species that is common to both mechanisms. It is suggested that the pathway that incorporates added14C labeled alcohol has an oxygen containing surface intermediate while the other reaction pathway involves an “oxygen-free” reaction intermediate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764496
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fischer-Tropsch synthesis: Impact of potassium and zirconium promoters on the activity and structure of an ultrafine iron oxide catalyst (1995)
    Springer
    Topics in catalysis 2 (1995), S. 1-15 
    Details
    ISSN: 1572-9028
    Keywords: Fischer-Tropscb synthesis ; ultrafine iron oxide catalyst ; Mössbauer ; XRD ; BET ; pretreatment ; promoters ; iron carbides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Slurry phase Fischer-Tropsch synthesis was conducted with an ultrafine iron oxide catalyst promoted with either 0.5 at% K or 1.0 at% Zr or both. Pretreatment in CO yielded higher conversions and a more stable catalyst than activation in hydrogen or synthesis gas. Hydrogen pretreatment of K promoted catalysts and synthesis gas activation in general were less effective. Mössbauer spectroscopy and XRD showedχ-Fe5C2 and ε′-Fe2.2C were formed during pretreatment in CO and did not depend on promoters present. Catalysts pretreated in H2 were reduced to metallic Fe and Fe3O4; promotion with K and Zr decreased the extent of reduction. Hydrogen pretreated catalysts, promoted with K, lost surface area and carbided rapidly under synthesis conditions. Activation in synthesis gas reduced all catalysts to Fe3O4. Subsequent synthesis did not affect the phase present for the unpromoted and Zr promoted catalysts while those promoted with K formed χ-Fe5C2 and ε′-Fe2.2C. It is concluded that pretreatment type is more important to the catalyst activity during the early period of synthesis than the impact of promotion with K and/or Zr and that changes in the bulk composition of iron catalysts do not necessarily correlate with changes in activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01491951
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    Paper (German National Licenses)
    Fulltext
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