Fischer–Tropsch synthesis: Effect of CO2 containing syngas over Pt promoted Co/γ-Al2O3 and K-promoted Fe catalysts

Subtask 3.4 - Fischer - Tropsch Fuels Development

“…Work by a number of researchers has shown that CO 2 can be incorporated into FT product using an iron-based catalyst (15)(16)(17)(18)22), but the catalyst tested by the EERC showed low productivity and rapid deactivation both in a pilot-scale reactor and in a more controlled laboratory-scale reactor when exposed to unsweetened syngas. High CO 2 concentration in bottled gas also had a negative impact on catalyst performance at low H 2 concentrations, but rapid catalyst deactivation was not apparent.…”

“…The amount of N 2 added in Test FTR48 is nearly equal to the sum of N 2 and CO 2 added in Test FTR40. CO 2 is reported to act as an inert over cobalt-based catalysts (16,17,19) and should affect cobalt-based catalyst similarly to N 2 . Since cobalt did not suffer as badly under N 2 in Test FTR48 as iron did in Test FTR40, cobalt-based catalysts might be more tolerant of syngas dilution by CO 2 than iron-based catalysts.…”

“…Since CO 2 is reported to act mainly as an inert diluent for FTS on cobalt (16,17,19), N 2 was selected as a surrogate. Use of N 2 to model CO 2 is probably not entirely valid, since research has shown that CO 2 may appear to compete with CO for absorption on cobalt (16), but N 2 was the only other gas readily available at the time. On the final day of Test FTR48, the feed was switched to 0.15 slpm H 2 , 0.1 slpm CO, and 0.4 slpm N 2 until the H 2 cylinder ran empty.…”

“…A number of researchers have studied the effects of CO 2 on FTS and have shown that ironbased FT catalysts can synthesize liquids from CO 2 (15)(16)(17)(18)(19)(20)(21)(22). The studies referenced used exclusively bottled gas for FTS in laboratory-scale reactors.…”

Negative Effects of CO2 in the Feed Stream on the Catalytic Performance of Precipitated Iron-Based Catalysts for Fischer–Tropsch Synthesis

“…Several researchers have reported the FTS over ironbased catalysts in a CO 2 -containing synthesis gas [5][6][7][8][9][10][11][12][13], but previous works on the FTS in a CO 2 -containing synthesis gas with a low H 2 /CO ratio (B1.0) are not abundant. Liu et al [5] investigated the effects of co-feeding CO 2 on the Fe-Mn FTS catalysts in a synthesis gas with a low H 2 /CO ratio (=1.0) by varying added CO 2 partial pressure in the feed stream at fixed total pressure and at fixed partial pressure of H 2 ?…”