Reduction of CO sub(2) with water splitting hydrogen under subcritical and supercritical hydrothermal conditions

Hydrothermal conversion of CO sub(2) into organic chemicals in the presence of Fe and Ni powder under subcritical and supercritical hydrothermal conditions has been carried out, and the results showed that H sub(2) could be obtained from water splitting under hydrothermal condition. According to Fe sub(3)O sub(4) formation, the reaction temperature seemed to influence the generation of H sub(2), and H sub(2) could be formed largely at supercritical condition especially at 425 degree C. The formic acid could be produced from CO sub(2) reduction, and the reaction temperature had a great effect on the formic acid yield. The increase in temperature could improved the formic acid yield, however higher temperature ( greater than or equal to 275 degree C) seemed to exert a minus influence on the formic acid yield due to decomposition of formic acid. The decomposition of formic acid became quick from 350 degree C, and the results showed that the formic acid was decomposed into methane at higher temperature (350 degree C).