Integrated CO2 capture and In-Situ methanation by efficient dual functional Li4SiO4@Ni/CeO2

Integrated carbon capture and utilization by methanation (ICCU-methanation) is an emerging concept in reducing CO2 emissions and storing H-2 simultaneously. One key of the technology is the development of dual functional materials (DFMs) that can efficiently capture CO2 and then catalyze it. Herein, we propose the construction of DFM using Li4SiO4 with superior CO2 adsorption/desorption features as sorbent and catalyst carrier, CeO2 as catalyst promoter and isolator, and Ni as catalytic metal, and comprehensively evaluate its characteristics and performance in ICCU-methanation. Results show that the DFM developed possess a high and stable CO2 capacity of 5.4 mmol center dot gDFM-1, 96 % CO2 conversion and 96 % CH4 selectivity under both the ideal CO2 capturing atmosphere and the realistic flue gas containing 10 vol% steam and 8 vol% O-2. Moreover, rapid CO2 dissociation from the DFM is observed at a temperature lower to 560 degrees C due to the reaction of H* dissociated by catalyst with carbonate to form formate, which further decomposes to release CO.

Automated summary

Integrated carbon capture and utilization by methanation (ICCU-methanation) is achieved using a dual functional material (DFM) constructed with Li4SiO4 as sorbent and catalyst carrier, CeO2 as catalyst promoter and isolator, and Ni as catalytic metal. The developed DFM exhibits a high and stable CO2 capacity, high CO2 conversion, and high CH4 selectivity. Additionally, rapid CO2 dissociation from the DFM is observed at a temperature lower than 560 degrees C.