Support effects in high temperature Fischer-Tropsch synthesis on iron catalysts

Sodium-promoted iron catalysts prepared on different supports for high temperature Fischer–Tropsch synthesis

“…The impregnation of silica and alumina support with iron nitrate followed by catalyst calcination in air results in the formation of the hematite (Fe 2 O 3 ) phase, while magnetite (Fe 3 O 4 ) was detected in the catalysts supported by CMK-3 and CNT. This observation is consistent with our previous report [27]. Iron particle size in the calcined catalysts was also affected by the nature of the support.…”

“…Note that iron nitrate decomposition in nitrogen instead of air did not affect the iron time yield to any noticeable extent in the Fe/SiO 2 catalyst ( Table 2). The decrease in the activity of Fe/SiO 2 compared to the carbon-supported catalysts was explained earlier by formation of inert silicates and lower degree of iron carbidization [27]. Some variation of the FT reaction rate was observed with time on stream.…”

“…Iron phase composition seems to be a major parameter which may affect catalytic performance sometimes even more importantly than iron dispersion. Higher catalytic performance was attributed [27] to the presence of iron carbides and iron-magnetite composites. In supported catalysts, the promoter can interact differently with both support and active phase.…”

“…ter mechanical stability and higher intrinsic activity. The effect of support chemical composition on the structure and catalytic performance of unpromoted iron catalysts in high temperature FT synthesis has been addressed in recent publications [27]. It was shown that the catalyst structure and iron species were strongly affected by the nature of the support.…”

On the structural, textural and morphological features of Fe-based catalysts supported on polystyrene mesoporous carbon for Fischer–Tropsch synthesis

“…The conversions of CO into hydrocarbons ranged from 25 to 45% and depended highly on the operating conditions ( A c c e p t e d M a n u s c r i p t 21 showed lower activity in comparison with its carbon-based counterparts. Lower activity of the FeSi catalysts relative to carbon supported catalysts could be due to a more difficult iron carbidization, as reported previously by Cheng et al [56].…”