The effect of syngas composition on the Fischer Tropsch synthesis over three-dimensionally ordered macro-porous iron based catalyst.

[Display omitted] • 3DOM Fe based FTS catalyst was developed by a Nitrate Oxidation-PMMA templating technique. • C 5 + selectivity was 70.44% when the 3DOM FT catalyst used in the simulated biosygas. • The CO conversion rate was 68.23% when the 3DOM FT catalyst used in the simulated biosygas. • CO 2 and CH 4 selectivity was 12–26% and 2.67–5.5%. Three-Dimensionally Ordered Macro-porous (3DOM) Fe based catalysts were synthesized via a facile "glyoxylate route" poly (methyl methacrylate) (PMMA) colloidal crystal template (CCT) method. Fischer Tropsch Synthesis (FT) using different biosyngasses over the 3DOM Fe based catalyst for producing the liquid hydrocarbon was studied. The morphology, structure and microstructures of 3DOM Fe based catalysts were characterized by SEM, BET, TPR, HRTEM, XRD, XPS and DRIFTS. The experimental results demonstrated that the hydrogen lean syngas decreased the partial pressure of H 2 /CO, which caused the decrease of the CO conversion rate during FT reaction. Moreover, the addition of CO 2 and CH 4 in the hydrogen lean syngas could well preserve the iron carbide phase in the catalyst, and the CO conversion rate was improved. Lower H 2 /CO ratio syngas would shift the liquid hydrocarbon distribution to higher molecular weight hydrocarbons, and the addition of CO 2 and CH 4 into the syngas further facilitated the shift. Meanwhile, it was also found that the CO conversion rate and C5+ selectivity were 68.23% and 70.44% respectively during the simulated biosyngas from biomass gasification (the hydrogen lean syngas contained CO 2 and CH 4) FT over the 3DOM Fe based catalyst, and CO 2 and CH 4 selectivity were 12–26% and 2.67–5.5% respectively. [ABSTRACT FROM AUTHOR]