Effect of CO2 content in synthesis gas on combined synthesis and hydrofining of hydrocarbons on Сo/SiO2+ZSM-5+Al2O3 catalyst

The paper studies the effect of CO 2 content in synthesis gas on the process of combined synthesis and hydroconversion of hydrocarbons on a bifunctional Сo/SiO 2 +ZSM-5+Al 2 O 3 catalyst. The studies were performed in the range of CO 2 content from 0 to 60 vol. % at temperatures of 240 and 250 °C, pressure of 2.0 MPa and GHSV of 1000 h -1 . It was shown that partial conversion of CO 2 into synthetic hydrocarbons is possible on the bifunctional cobalt catalyst. Processing of carbon dioxide added to synthesis gas occurs in the range of CO 2 concentrations of 20-40 vol. %. The maximum degree of CO 2 conversion was 5.3 % at 240 °C and 20 vol. % CO 2 in gas. It has been established that the addition of CO 2 to synthesis gas leads to an increase in selectivity for C 5+ hydrocarbons and the amount of isomeric hydrocarbons in the synthesis products, which contribute to the improvement of the characteristics of motor fuel, the octane number of the gasoline fraction and the pour point of the diesel fraction.