Slurry-phase CO2 hydrogenation to hydrocarbons over a precipitated Fe-Cu-Al/K catalyst: Investigation of reaction conditions

The hydrogenation of CO2 to hydrocarbons over a precipitated Fe-Cu-Al/K cat alyst was studied in a slurry reactor for the first time. Reducibility of t he catalyst and effect of reaction variables (temperature, pressure and H-2 /CO2 ratio of the feed gas) on the catalytic reaction performance were inve stigated. The reaction results indicated that the Fe-Cu-Al/K catalyst showe d a good CO2 hydrogenation performance at a relatively low temperature (533 K). With the increase of reaction temperature CO2 conversion and olefin to paraffin (O/P) ratio in C-2-C-4 hydrocarbons as well as the selectivity to C-2-C-4 fraction increased, while CO and CH4 selectivity showed a reverse trend. With the increase in reaction pressure, CO2 conversion and the selec tivity to hydrocarbons increased, while the CO selectivity and O/P ratio of C-2-C-4 hydrocarbons decreased. The investigation of H-2/CO2 ratio reveale d that CO2 conversion and CH4 selectivity increased while CO selectivity an d O/P ratio of C-2-C-4 decreased with increasing H-2/CO2 ratio.