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.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第7期2057-2061,2067,共6页
Bulletin of the Chinese Ceramic Society
关键词
硅酸锂
吸收
CO2
动力学
lithium silicate
absorption
carbon dioxide
kinetics
