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.
The problem of carbon dioxide utilization is of increasing concern to the public, since measures to reduce greenhouse gas emissions are no longer sufficient to prevent a global increase in temperature on the planet. The global energy sector is facing two major challenges: skyrocketing prices for petroleum products and an increase in the amount of carbon dioxide emitted into the atmosphere by industry. The growing anthropogenic pressure on the environment has increased interest in the geological storage of carbon dioxide. Developments in the field of alternative energy sources are becoming more and more relevant: hydrogenation and synthesis, solar energy, hydrogen energy. Promising trend, from the point of view of utilization, is associated with the production and use of environmentally friendly energy carriers through the conversion of carbon dioxide. The article discusses modern technologies for producing hydrogen and industrial conversion of carbon dioxide into useful products, including the author's nature-like method for converting carbon dioxide into green energy resources. Keywords: carbon dioxide utilization; underground storage; hydrogenation and synthesis; hydrocarbons; hydrogen; alternative energy sources; catalysts.
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