| 摘要 |
PROBLEM TO BE SOLVED: To realize a carbon dioxide absorbent which has improved carbon dioxide absorbing efficiency by suppressing the growth of the grains thereof on synthesis or regeneration of the material. SOLUTION: The carbon dioxide absorbent has, as a major component, lithium silicate of which the main constituting phase is Li<SB>4</SB>SiO<SB>4</SB>, wherein the crystal grain size of the lithium silicate is 1 to 12μm. The carbon dioxide absorbent is obtained by mixing silica, lithium carbonate and carbon or a pyrolytic organic substance, heating the mixture at 700 to 1,000°C to synthesize lithium silicate, or heating a mixture of silica and lithium carbonate to <700°C in a gas atmosphere having a carbon dioxide concentration of≤20 vol.%. COPYRIGHT: (C)2004,JPO&NCIPI
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