Recycling and utilizing CO<sub>2</sub> is very important significance to realizing energy saving and emission reduction.Lithium silicate (Li<sub>4</sub>SiO<sub>4</sub>) absorbents...Recycling and utilizing CO<sub>2</sub> is very important significance to realizing energy saving and emission reduction.Lithium silicate (Li<sub>4</sub>SiO<sub>4</sub>) absorbents for CO<sub>2</sub> were prepared by high-temperature solid-state reaction.Thermodynamic equilibrium of Li<sub>4</sub>SiO<sub>4</sub> absorption CO<sub>2</sub> was discussed using the HSC5.0 code.The capability of Li<sub>4</sub>SiO<sub>4</sub> for absorption CO<sub>2</sub> was investigated using the thermobalance instrument.The crystal structure and surface morphologies of the Li<sub>4</sub>SiO<sub>4</sub> were also analyzed by X-ray diffraction,SEM.The results showed:the absorption reaction is fast in the temperature range 600<sup>7</sup>20℃,the maximum absorption rate(w) was 29.16%;and the desorption reaction began in 750℃,then Li<sub>4</sub>SiO<sub>4</sub> is regenerated.The concentrations of CO<sub>2</sub> obviously affect on the absorption speed and the maximum absorption rate;but the flow rate of CO<sub>2</sub> little influences the absorption capability.展开更多
文摘Recycling and utilizing CO<sub>2</sub> is very important significance to realizing energy saving and emission reduction.Lithium silicate (Li<sub>4</sub>SiO<sub>4</sub>) absorbents for CO<sub>2</sub> were prepared by high-temperature solid-state reaction.Thermodynamic equilibrium of Li<sub>4</sub>SiO<sub>4</sub> absorption CO<sub>2</sub> was discussed using the HSC5.0 code.The capability of Li<sub>4</sub>SiO<sub>4</sub> for absorption CO<sub>2</sub> was investigated using the thermobalance instrument.The crystal structure and surface morphologies of the Li<sub>4</sub>SiO<sub>4</sub> were also analyzed by X-ray diffraction,SEM.The results showed:the absorption reaction is fast in the temperature range 600<sup>7</sup>20℃,the maximum absorption rate(w) was 29.16%;and the desorption reaction began in 750℃,then Li<sub>4</sub>SiO<sub>4</sub> is regenerated.The concentrations of CO<sub>2</sub> obviously affect on the absorption speed and the maximum absorption rate;but the flow rate of CO<sub>2</sub> little influences the absorption capability.