Effect of Potassium Promotion on Iron-Based Catalysts for Fischer–Tropsch Synthesis

Technology Development for Iron and Cobalt Fischer-Tropsch Catalysts

“…1.13). The inhibition effect on the methane formation and the promotion effect of chain growth of potassium are in agreement with the results obtained in several earlier studies on Fe-based catalysts [16,19]. The decrease in methane selectivity and the increase in C 5+ selectivity are due to the increased CO and lower hydrogen surface coverage in the presence of potassium, as discussed before.…”

Metal organic framework-mediated synthesis of highly active and stable Fischer-Tropsch catalysts

“…The Fe@C catalysts were tested in the FTS reaction at 613 K, 20 bar, H 2 /CO ¼ 1 and gas hourly space velocity (GHSV) of 30,000 h À 1 (space velocity based on catalyst bed volume). Owing to the outstanding effect of potassium promotion on iron-based catalyst for FTS, namely improving activity and olefins to paraffins ratio [33][34][35] , a series of alkali-promoted samples were are also synthesized.…”

Technology Development for Iron and Cobalt Fischer-Tropsch Catalysts

“…It shows that although CO addition can be used 2 to decrease CO yields during FTS, the elimination of net CO formation may well 2 2 require levels of CO that are impractical because of separation and re-compression Figure 11 shows CO conversion as a function of reciprocal space velocity under different conditions. Water-gas shift reactions during FT synthesis lead to a reduced water concentration and an increased hydrogen concentration, both of which increase CO conversion rate [19]. Therefore, CO reaction rate was almost independent of space times at 220 C and 235 C. Low temperatures favored the formation of high molecular weight hydrocarbon.…”