Carbon recycling system through methanation of CO2 in flue gas in LNG power plant

A bench scale test at ambient pressure has been performed for carbon recycling system using a ferrite process in LNG power plant. The chemical reaction consists of two steps; (i) adsorptive separation and decomposition of CO2 to carbon on oxygen-deficient Ni ferrite and (ii) methanation of deposited carbon. CO2 decomposition and methanation reactivities were much improved when the honeycomb support was used instead of a packed-bed-type reactor. The overall methanation rate of CO2 in flue gas from LNG power plant could achieve 1,000 Nm(3) h(-1) when 12,000 kg Ni ferrite loaded on a honeycomb support was used. The present methanation and carbon recycling system could be extended to other CO2 sources such as IGCC power plant and depleted natural gas plant. (C) 1997 Elsevier Science Ltd.