Experimental study of possibility to increase the efficiency of CO2 utilization on iron-containing fillers with green energy carriers generation

Results of additional laboratory studies are presented for carbon dioxide utilization method with green generation of hydrogen and hydrocarbons. The method consists in interaction of water with dissolved CO2 on the surface of iron-containing fillers. The process proceeds at temperatures starting from ambient conditions and does not require creation of high pressures or electric current in the system. The interaction is accompanied by intense evolution of gas phase with high content of hydrogen. Carbon is transformed into carbonates and small quantities of generated hydrocarbons. Influence of temperature and process parameters is studied for steel turnings used as a prototype of cheap fillers produced from metalworking wastes. The possibility to optimize the degree of CO2 utilization is shown by controlling the carbonized water saturation pressure. According to the results of considered and previous series of experiments, the achieved degree of CO2 utilization is up to 76-83%, with hydrogen content in the output gas of 63-82%. Keywords: carbon dioxide utilization; hydrogen; hydrocarbons; iron-containing filler; carbonated water; iron turnings; green energy carriers.