Li_4SiO_4高温吸收CO_2性能测试及动力学行为研究  

Property and Kinetics of Absorbing CO_2 with Li_4SiO_4 Material

作　　者：王金香[1] 刘振英[1] 

机构地区：[1]安徽理工大学材料科学与工程学院,淮南232001

出　　处：《硅酸盐通报》2015年第7期2057-2061,2067,共6页Bulletin of the Chinese Ceramic Society

摘　　要：采用高温固相反应法,制备出在高温450-750℃之间可直接可逆吸收CO2的Li4SiO4材料,借助扫描电子显微镜（SEM）及X射线衍射分析仪（XRD）分别对材料进行了表面形貌研究及结构特征分析,采用热重分析仪（TG）研究了材料吸收CO2的性能,并采用双指数模型对材料定温吸附CO2的行为进行了模拟。试验结果表明,采用固相法于700℃煅烧6 h即可获得性能优异的Li4SiO4材料,材料对CO2的吸附过程主要受锂离子扩散速率的影响,在650℃材料具有较好的吸附性能,恒温110 min即可获得31%左右的吸收容量。Lithium silicate as CO2 absorbent at 450-750 ℃ was prepared by high-temperature solid-state reaction. The microscopic morphology of absorbents was viewed by a scanning electron microscopy（ SEM）,while the crystal structure of the lithium silicate absorbents was studied by X-ray diffraction（ XRD） patterns. The CO2-absorption abilities were measured with a thermogravimetric analyzer（ TG） and the isothermal study data were fitted according to a double exponential model. The results showed that Li4SiO4prepared at 700 ℃ for 6 h had good absorption ability,and the lithium diffusion process was the limiting step in the adsorption process. Meanwhile,it was found that Li4SiO4 heated at 650 ℃ had better absorption ability and the CO2 absorption capacity reached 31% after 110 min.

关 键 词：硅酸锂 吸收 CO2 动力学 

分 类 号：TB34[一般工业技术—材料科学与工程]