硅酸锂吸附CO2的特性研究

硅酸锂比锆酸锂吸附容量大、吸附速度快、成本低，是将来高温CO₂吸附的首选材料。用双壳机理解释了硅酸锂吸附CO₂的过程；分析了合成工艺、合成温度、金属掺杂、粒径等合成条件和吸附温度、脱附温度、CO₂浓度、气体流量、再循环等运行条件对硅酸锂吸附CO₂性能的影响；指出硅酸锂在甲烷制氢和整体煤气化联合循环工程的CO蒸汽重整工艺分离CO₂方面具有良好的应用前景。

Characteristics of Lithium Silicate as CO2 Absorbent

Compared to lithium zirconate,the lithium silicate has such merits as large CO2-adsorption capacity,high adsorption rate and low cost,and is expected to be the principal material for high-temperature CO2-absorption.The double-shell mechanism theory is used to explain the CO2 adsorption process.An analysis is made on the influence of some synthesis conditions,including synthesis process,synthesis temperature,doped metal,particle size,and some operation conditions,including adsorption temperature,desorption temperature,CO2 concentration,gas flux,recycle,on the CO2-adsorption performance of lithium silicate.It is concluded that lithium silicate will find a wide application in the future as a CO2-absorbent in methane steam reforming and IGCC equilibrium-shift process.