Catalytic process for methane production from atmospheric carbon dioxide utilizing renewable energy

摘要

Kinetics of CO2 methanation reaction over the commercial nickel catalyst NKM-2V was studied in a perfectly mixed reactor at T= 250-350 degrees C. It has been shown for the stoichiometric mixture of CO2 and H-2 that both the catalyst activity and CO2 conversion increase with temperature. The decrease in CO2: H-2 ratio at T = 300 degrees C have led to the rise of CO2 conversion to methane. The composite material K2CO3/ Al2O3, which is a promising solid absorbent for direct CO2 capture from ambient air, has been synthesized and studied in the temperature-swing adsorption cycles. It has been shown that the increase in the adsorber temperature from 200 to 325 degrees C during the thermal regeneration step enhances the utilization extent of the composite sorbent in the cycle with the total CO2 uptake rising from 1.9 to 4.4 wt.%. The process combining thermal regeneration of the composite sorbent in hydrogen atmosphere at T = 325 degrees C and CO2 methanation reaction over the commercial nickel catalyst NKM-2V at T= 425 degrees C has been studied using the catalytic reactor connected to the outlet of the adsorber. It has been demonstrated that it is possible to transform CO2 into methane with conversion> 99%.