| 초록 |
Syngas (CO + H2) can be converted into clean fuels and chemicals by a widely known process called Fischer–Tropsch synthesis (FTS: nCO + {2n(+1)}H2 → CnH2n(+2) + nH2O). However, traditional FTS is restricted by ASF model (gasoline, jet fuel, diesel: 48%, 41%, 40%). Hence, bifunctional catalysts (active metal and acidic ZSM-5) were used; but, the correlation between the ZSM-5 acidic properties and the C5+ distribution has not been clearly established. In this study, the precipitated Fe-based catalysts were physically mixed with various mass fractions (5.88 wt%, 11,11 wt%, 20 wt%) of ZSM-5 (Si/Al: 15, 25, 140), followed by activation, then reaction at 275 ºC and 1.5 MPa for 114 h. For each mass fraction with different Si/Al ratios, the differences of those hydrocarbon ranges (C1, C2-4, C5+) negligible; however, the selectivity of C5-20, C21+ showed great differences depending on the Si/Al ratios. This implies that Si/Al ratio (acidic site) greatly affected the selectivity of C5-20, C21+ due to hydrocracking reaction. Other acidic reactions were also being investigated. |
