Iron‐Based Fischer–Tropsch Synthesis for the Efficient Conversion of Carbon Dioxide into Isoparaffins

Iron‐based Fischer–Tropsch (FT) synthesis in combination with hydroisomerization in the presence of zeolites for the synthesis of isoparaffins from CO 2 /H 2 was conducted in a fixed‐bed reactor. Relative to supported iron catalysts, the precipitated one efficiently converted intermediate CO into hydrocarbons by supplying a high density of FT active sites on the catalyst surface. Removing water by interstage cooling and promoting the CO conversion step in the FT synthesis were effective approaches in achieving a high CO 2 conversion, because of an increase in the driving force to the reaction equilibrium. Particle mixing of 92.6 Fe7.4 K with either 0.5 Pd/β or HZSM‐5 zeolite effectively hydroisomerized the resulting FT hydrocarbons into gasoline‐range isoparaffins. Particularly, HZSM‐5 displayed a higher isoparaffin selectivity at approximately 70 %, which resulted from easier hydrocracking and hydroisomerization of the olefinic FT primary products.