| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel material exhibiting high COabsorption rate in a low temperature range of 400°C or less without using lithium as a main raw material, a manufacturing method of the material, an absorption method of carbonic acid gas, a carbonic acid gas absorption device, and a carbonic acid gas separation device.SOLUTION: There is provided a manufacturing method of α-lithium ferrite including a process (a1) of mixing γ- FeOand NaNOto obtain a mixture powder MP1 or a process (a2) of mixing γ- FeO, NaNOand LiNOand/or KNOto obtain a mixture powder MP2, where a molar ratio of LiNOand/or KNOto NaNOis in a range of 0.85:0.15 to less than 1:over 0, and a process (b1) of heating the resulting mixture powder MP1 or MP2 at a temperature of 570°C to 700°C to produce α-NaFeOor substituted type-NaFeOor a process (b2) of heating the resulting mixture powder MP1 or MP2 at a temperature T1 of 550 to 600°C, then increasing the temperature to a temperature T2 of 570 to 750°C, where T1<T2, and then further heating the powder to produce α-NaFeOor substituted type-NaFeO, where the substituted type-NaFeOis a compound with a part of Na substituted by Li and/or K. |
