Unexpected increase in C5+ selectivity at temperature rise in high pressure Fischer-Tropsch synthesis over Co-Al2O3/SiO2 catalyst

• Published in: Catalysis communications Vol. 99; pp. 25 - 29
• Main Authors: Savost'yanov, Alexander P., Yakovenko, Roman E., Narochniy, Grigoriy B., Sulima, Sergey I., Bakun, Vera G., Soromotin, Vitaliy N., Mitchenko, Serge A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2017
• Subjects: Co-Al2O3/SiO2 catalyst; Fischer-Tropsch synthesis; Fixed-bed reactor; Process conditions; Product selectivity; Process conditions; Product selectivity; Fischer-Tropsch synthesis; Co-Al2O3/SiO2 catalyst; Fixed-bed reactor
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2017.05.021

The effect of process variables on selectivity of Fischer-Tropsch synthesis (FTS) over Co/SiO2 catalyst was studied in a fixed-bed reactor operating in gas recycle mode. The unusual increase in C5+ selectivity with temperature was found in FTS at 6MPa. Whereas at a moderate pressure (2MPa) the catalyst response on temperature was typical for FTS, i.e. increase in activity concurrent with decrease of C5+ selectivity, at high pressure the C5+ selectivity grew up in parallel with catalyst activity. Selectivity to C35+ hydrocarbons was in order of magnitude greater in the FTS at 6MPa compared to 2MPa. C5+ output rises with temperature in Co-based Fischer-Tropsch process at 6MPa.The pressure of 6MPa favors C35+ formation via Co-based Fischer-Tropsch protocol.Recycle mode allows keeping of thermal stability in fixed-bed reactor for FTS.Co-based catalyst efficiency for C5+ Fischer-Tropsch products rises with pressure.