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Mössbauer and magnetic studies of iron-zeolite and iron-cobalt zeolite catalysts used in synthesis gas conversion

Oskoie, M ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. Publisher: Materials and Energy Research Center , 2007
  3. Abstract:
  4. Medium-pore (diameter - 6A) zeolites such as ZSM-5 and silicalite impregnated with Group VIII metals provide selective catalytic pathways for the conversion of synthesis gas to gasoline or olefins. Mössbauer and magnetic studies on these catalysts containing iron or iron plus cobalt are reported. The zeolites were impregnated with metal nitrate solutions, reduced, and carbided to yield showed Fe3+ type spectra. The ZSM-5 (14.7 % Fe) and Silicalite (13.6 % Fe) samples exposed to H2 (450 C) showed an approximate 85% reduction to the metallic state. The carbided ZSM-5 (14.7 % Fe) revealed a spectrum of Hagg carbide (Fe5C2), an active component of the catalyst. The used catalysts showed mixtures of Hagg carbide (Fe5C2) and cementite (Fe3C). It is suggested that the selectivity of ZSM-5 (5.6 % Fe, 4.5 % Co) resulted from iron-cobalt alloy formation
  5. Keywords:
  6. Carbides ; Carbon monoxide ; Catalysis ; Cobalt ; Cobalt alloys ; High pressure effects ; Iron alloys ; Molybdenum ; Olefins ; Silicate minerals ; Solutions ; Synthesis gas ; Active components ; Carbided ; Catalytic pathways ; Gas conversion ; Group VIII metals ; Iron-cobalt ; Iron-cobalt alloy ; Magnetic studies ; Metal nitrate solution ; Metallic state ; Selective catalyst ; Silicalite ; Zeolite catalyst ; Zeolites ; Catalysts
  7. Source: International Journal of Engineering, Transactions B: Applications ; Volume 20, Issue 3 , 2007 , Pages 263-274 ; 1728-144X (ISSN)
  8. URL: https://www.ije.ir/article_71674.html