Enhanced CO2 capture over Li-containing β-NaFeO2 materials: Effect of lithium nitrate addition

Herein, we present a feasible methodology for the improvement of the CO2 capture properties of sodium-ferrite-based materials through the addition of lithium nitrate. Initially, the pristine material (beta-NaFeO2) was synthetized through the nitrate pyrolysis method and then it was mechanically mixed with different amounts of LiNO3(2.5, 5, 10, 15 and 25 mol% of lithium). Materials were structural and microstructurally characterized and the CO2 capture properties were evaluated through TGA analyses, using two different approaches; dynamic and isothermal tests. Result show that the best CO2 capture performance is achieved in the sample containing 5 mol% of lithium nitrate, identified as 5Li-NaFeO2. The CO2 capture enhancement resulted from the formation of a LiNO3-Na2CO3 eutectic phase, acting as a liquid carrier and promoting the surface and bulk carbonation of the sodium ferrite particles. In fact, the 5Li-NaFeO2 dioxide capture enhancement was reflected by increasing the amount of CO2 captured as well as by reducing the temperature range of capture, compared to the pristine beta-NaFeO2 material.

Automated summary

This study presents a feasible methodology for improving the CO2 capture properties of sodium-ferrite-based materials by adding lithium nitrate. The experiment results show that the sample containing 5 mol% of lithium nitrate demonstrates the best CO2 capture performance, which is attributed to the formation of a LiNO3-Na2CO3 eutectic phase that enhances the carbonation of the material. The enhanced CO2 capture performance of 5Li-NaFeO2 is reflected by increased CO2 capture amount and reduced capture temperature range compared to the pristine beta-NaFeO2 material.