Influence of operating conditions in a continuously stirred tank reactor on the formation of carbon species on alumina supported cobalt Fischer–Tropsch catalysts
作者： D. Peña , A. Griboval-Constant , V. Lecocq , F. Diehl , A.Y. Khodakov
DOI: 10.1016/J.CATTOD.2013.06.014
关键词:
摘要: Abstract The paper focuses on the identification of carbon species using a wide range ex situ characterization techniques (TPH/MS, TGA-DTA, XPS, TOF-SIMS) in spent 15 wt% Co/Al2O3 supported catalysts exposed to different conditions Fischer–Tropsch synthesis continuously stirred tank reactor (CSTR) at 20 bar total pressure, gas-space velocities and H2/CO ratios. Three types carbonaceous were uncovered used catalysts: (i) hydrcarbobns (probably wax), (ii) strongly adsorbed hydrocarbons (iii) amorphous polymeric carbon. amounts deposed depend operating conditions. In agreement with observed slow catalyst deactivation, only very small when was H2/CO = 2 syngas ratio moderate monoxide conversions. Lower gas space velocity lower lead larger species. Strongly seem contribute deactivation. Cobalt carbide graphitic not detected by methods.
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