A fundamental study of CO2 capture and CH4 production in a rapid cyclic system using nickel-lithium-silicate as a catal-sorbent

Sustainable CH4 production in CO2 green technology has been recently proposed to mitigate climate emergency and to utilize waste sources of CO2 in the industry, reducing the total thermal energy. However, earlier studies have focused primarily on the CO2 capture capacity and CH4 productivity, and have not elucidated the kinetics of CO2 capture and CH4 production. Here, we prepared a nickel-lithium-silicate (Ni/LS) catal-sorbent by solid state reaction, which is one of the highly scalable synthesis method. The Ni/LS shows the high CO2 capture capacity and CH4 productivity with multicycle stability at 550 °C and the carbonated Ni/LS catal-sorbent is regenerated completely at lower temperature than that of conventional decarbonation. Moreover, the decarbonation rate of the carbonated Ni/LS catal-sorbent is enhanced significantly according to the Le Chatelier’s principle, enabling the excellent working CO2 capture capacity and CH4 productivity with multicycle stability in a rapid cyclic system without temperature or pressure swings.