Pentalithium aluminate (β-Li5AlO4) and the corresponding iron-containing solid solution (Li5(Al1-xFex)O4)were synthetized by solid-state reaction.All the samples were characterized structural and microstructurally by X-ray diffraction,solid-state nuclear magnetic resonance,scanning electron microscopy,N2 adsorption-desorption and temperature-programmed desorption of CO2.Results showed that 30mol% of iron can be incorporated into the β-LisAlO4 crystalline structure at aluminum positions.Moreover,iron addition induced morphological and superficial reactivity variations.Li5(Al1-xFex)O4 samples chemisorbed CO2 between 200 and 700 ℃,where the superficial chemisorption presented the highest enhancement,in comparison to β-Li5AlO4.Additionally,Li5(Al1-xFex)O4 samples sintered at higher temperatures than β-Li5AlO4.Isothermal CO2 chemisorption experiments of β-Li5AlO4 and Li5(Al1-xFex)O4 were fitted to a first order reaction model,corroborating that iron enhances the CO2 chemisorption,kinetically.When oxygen was added to the gas flow,CO2 chemisorption process was mainly enhanced between 400 and 600℃ for the Li5(Al0.8Fe0.2)O4 sample in comparison to β-Li5AlO4.Hence,Li5(Al1-xFex)O4 solid solution presented an enhanced CO2 chemisorption process,in the presence and absence of oxygen,in comparison to β-Li5AlO4.