Enhanced olefin production in Fischer–Tropsch synthesis using ammonia containing synthesis gas feeds

Direct production of olefins via syngas conversion over Co2C-based catalyst in slurry bed reactor

“…40,41 Rausch et al used the ammonia containing syngas as feedstock for FTO reaction over iron-and cobalt-based catalyst in SBR, and the selectivity to a-olens was found to signicantly increase at the expense of catalyst activity. 42 Herein, we aim to explore the possibility of Co 2 C-based FTO catalyst used in SBR. The inuence of different reactors on the catalytic performance of Co 2 C-based catalyst was studied.…”

Fischer–Tropsch synthesis: effect of ammonia on product selectivities for a Pt promoted Co/alumina catalyst

“…The effect of ammonia on FTS activity and selectivity of cobalt catalysts is unclear; some researchers have reported no effect, 13,14 while others have reported that ammonia had a signicant impact. [15][16][17][18]20,21 In the open literature, most of the studies have not reported the product selectivities at similar CO conversion level. Recently, Rausch et al 17 reported that ammonia addition had a signicant impact on activity and product selectivity as well.…”

“…[9][10][11][12] The effect of ammonia on FTS has been reported in a few studies over iron and cobalt catalysts and the reported results, however, have been rather contradictory. [13][14][15][16][17][18] Claeys et al 13 reported that co-feeding of up to 25% NH 3 in syngas did not affect FT activity; similarly Borg et al 14 reported that 4.2 ppmv of ammonia does not have an impact for a CoRe/Al 2 O 3 catalyst. An Exxon patent 15 claims that a combined concentration of 100 ppb of NH 3 and HCN in syngas will result in a catalyst half-life of only 4 days for a supported cobalt catalyst in a slurry reactor.…”

“…Van Berge 16 reported that cobalt catalysts were rapidly but reversibly deactivated by HCN and NH 3 . In a recent investigation, Rausch et al 17 indicated that ammonia had a signicant effect on the cobalt catalyst. Ordomsky et al 18 reported that the addition of NH 3 and CH 3 CN during FT synthesis has a signicant irreversible deactivation on supported cobalt catalysts, whereas no noticeable deactivation was observed with supported iron catalysts.…”

Effect of Ca Promoter on the Structure and Catalytic Behavior of FeK/Al2O3 Catalyst in Fischer‐Tropsch Synthesis

“…The activity, selectivity and stability are strongly affected by promoters in terms of electronic and structural modification. [9,10] Metal oxides (i. e. ZrO 2 , TiO 2 ) are usually considered as structural promoters to disperse and stabilize Fe species, [11,12] while alkali metals (e. g. K, Na) and several non-metal elements (e. g. N, S) always function as electronic promoters because of the electron donation to iron that facilitates CO dissociation and suppresses CÀ C coupling. [13][14][15][16] Dual promoters usually function synergistically in literatures.…”