Abstract
A natural gas-based power plant design with onsite methanation of CO 2 incorporated has been proposed for an option of mitigation technology of CO 2 emissions. CO 2 and NO x in the flue gas at 330°C are adsorbed/separated from the main constituent N 2 gas by oxygen-deficient Ni(II) ferrite reactor and simultaneously decomposed to carbon and gaseous N 2 at the same temperature. Then, carbon is hydrogenated to form CH 4 at 330°C and recycled to the natural gas boiler along with the process heat. This system can be applied easily to existing power plants and will contribute to mitigation of CO 2 emissions at a minimum additional cost and will be important when H 2 gas would be supplied cheaply and sufficiently. A thermochemical water-splitting to form H 2 gas using a tailor-made ceramics and degraded thermal energy at 300°C was described for an efficient utilization of fossil energy.
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