화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.16, No.6, 1025-1032, November, 2010
DOI10.1016/j.jiec.2010.09.003  Export Citation
Studies of carbonaceous species in alkali promoted iron catalysts during Fischer-Tropsch synthesis
Ali Nakhaei Pour1, 2, †, Mohammad Reza Housaindokht1, Jamshid Zarkesh2, and Sayyed Faramarz Tayyari1
  • 1Department of Chemistry, Ferdowsi University of Mashhad, P.O. Box: 91775-1436, Mashhad, Iran
  • 2Research Institute of Petroleum Industry of National Iranian Oil Company, P.O. Box: 14665-137, Tehran, Iran
E-mail:
The effects of La, Mg and Ca promoters on carbonaceous surface and bulk iron carbide species formed in the alkali promoted iron catalysts are studied under realistic Fischer-Tropsch synthesis (FTS) conditions. Compositions of bulk iron phase and phase transformations of carbonaceous species during pretreatment and FTS reaction were characterized using the temperature-programmed surface reaction with hydrogen (TPSR-H2) and XRD techniques. Many carbonaceous species on surface and bulk were qualitatively and quantitatively identified by combined TPSR-H2 and XRD spectra of the alkali promoted iron catalyst. These species, sorted by the their reactivity with H2 from high to low, were recognized as (a) adsorbed, atomic carbon; (b) amorphous, lightly polymerized hydrocarbon or carbon surface species; (c) bulk carbides and (d) disordered and moderately ordered graphitic surface carbons. The results revealed that while the surface basicity of the iron catalyst increased the CO dissociation proceeds faster than carbon hydrogenation. This phenomenon leads to excessive carbon deposition and formation of inactive iron carbide phases and graphitic type carbonaceous surface species, and consequently leads to catalyst deactivation.
Keywords:Fischer-Tropsch synthesis;Iron-based catalyst;Catalyst deactivation;Alkali promoters
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