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Previous studies reported that Na2ZrO3 exhibited better high temperature CO2 capture features than other Li-base materials towards its use in hydrogen production. This work is aimed to increase Na2ZrO3 absorption capacity by the addition of Li. Na2ZrO3 was synthesized by solid-state reaction and impregnated with LiNO3 at different Li/Na molar ratios: 0, 0.03, 0.05, 0.1 and 0.25. Characterization consisted in XRD and SEM. Absorbents were evaluated by TGA at 600 °C, 80 % CO2/Ar (absorption) and 800 °C, air (regeneration). XRD results found the Na2ZrO3 structure in all samples. However, Li promoted samples presented substitution of Na by Li in the Na2ZrO3 structure. According to TGA, absorption/regeneration kinetics was not modified by the effect of Li. Instead, CO2 capture capacity increased with Li content up to a limit between 10 to 25 % mol. This was attributed to formation of Na4ZrO4 type structures, which can be responsible of the increase in capture capacity.
Li promoted Na2ZrO3, High temperature CO2 absorption
The authors gratefully acknowledge MSc. Enrique Torres, for his support during the XRD studies in the present research. The authors desire to acknowledge specially to The National Nanotechnology Laboratory at CIMAV.
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