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Recycling and utilizing CO_2 is very important significance to realizing energy saving and emission reduction.Lithium silicate (Li_4SiO_4) absorbents for CO_2 were prepared by high-temperature solid-state reaction.Thermodynamic equilibrium of Li_4SiO_4 absorption CO_2 was discussed using the HSC5.0 code.The capability of Li_4SiO_4 for absorption CO_2 was investigated using the thermobalance instrument.The crystal structure and surface morphologies of the Li_4SiO_4 were also analyzed by X-ray diffraction,SEM.The results showed:the absorption reaction is fast in the temperature range 600~720℃,the maximum absorption rate(w) was 29.16%;and the desorption reaction began in 750℃,then Li_4SiO_4 is regenerated.The concentrations of CO_2 obviously affect on the absorption speed and the maximum absorption rate;but the flow rate of CO_2 little influences the absorption capability.
Recycling and utilizing CO_2 is very important significance in energy conservation and emission reduction. Lithium silicate (Li_4SiO_4) absorbents for CO_2 were prepared by high-temperature solid-state reaction. Thermodynamic equilibrium of Li_4SiO_4 absorption CO_2 was discussed using the HSC5.0 code. The capability of Li_4SiO_4 for absorption CO_2 was investigated using the thermobalance instrument. The crystal structure and surface morphologies of the Li_4SiO_4 were also analyzed by X-ray diffraction, SEM. The results showed: the absorption reaction is fast in the temperature range 600 ~ 720 ° C, the maximum absorption rate (w) was 29.16%; and the desorption reaction began at 750 ° C, then Li_4SiO_4 is regenerated. These concentrations of CO_2 significantly affect the absorption rate and the maximum absorption rate; but the flow rate of CO_2 little influences the absorption capability.