The effect of CO2 content in synthesis gas on the hydrocarbon synthesis–hydrotreatment combined procedure in the presence of a Co/SiO2+ZSM-5+Al2O3 bifunctional catalyst was studied. The studies were conducted in a CO2 content range of 0–60 vol % at temperatures of 240 and 250°C, a pressure of 2.0 MPa, and a GHSV of 1000 h−1. It was that CO2 can be partly converted to synthetic hydrocarbons in the presence of the bifunctional cobalt catalyst. The carbon dioxide added to synthesis gas undergoes conversion in a CO2 concentration range of 20–40 vol %. The maximum CO2 conversion is 5.3% at 240°C and 20 vol % of CO2 in the gas. The addition of CO2 to synthesis gas leads to an increase in the content of branched hydrocarbons in the Fischer–Tropsch synthesis products. These hydrocarbons contribute to an improvement in the detonation resistance of gasoline and the low-temperature properties of the diesel fraction (cloud point, cold filter plugging point).
Narochnyi et al. (Wed,) studied this question.