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  • Articles: DFG German National Licenses  (4)
  • iron catalyst  (2)
  • Mössbauer  (1)
  • Pt-Sn catalyst  (1)
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  • Articles: DFG German National Licenses  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Catalysis letters 4 (1990), S. 303-308 
    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
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  • 2
    ISSN: 1572-879X
    Keywords: Fischer-Tropsch synthesis ; iron catalyst ; tracer studies ; 14C labeled ethene ; alkenes ; chain growth ; radioactivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tracer studies with C labeled ethene show that for synthesis over a doubly promoted iron catalyst at 7 atm and ca. 60% CO conversion, higher carbon number products are formed from ethene initiation. About 10% of the added ethene (ethene/CO ∼ 0.02) is incorporated into C 5 + products and that ca. 85% of the ethene that is incorporated does so by initiating chain growth.
    Type of Medium: Electronic Resource
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  • 3
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Topics in catalysis 10 (2000), S. 133-139 
    ISSN: 1572-9028
    Keywords: Fischer–Tropsch synthesis ; iron catalyst ; active phase of iron ; activation of iron catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The equilibrium phase compositions of iron have been calculated for gas compositions that could be encountered during the Fischer–Tropsch synthesis. The gas compositions measured experimentally for CO conversion levels in the 30–90% range show that iron should be present as the carbide phase. However, experimental characterization of iron catalysts show that a significant fraction of the iron is present as Fe3O4 following synthesis for several days. A model that can account for the experimental catalyst phase composition and the gases present in the reactor would have a core of Fe3O4 and an outer layer of iron carbides.
    Type of Medium: Electronic Resource
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