K的掺杂对硅酸锂吸收CO_2性能的影响  

Effect of Doping K Element on Properties of Lithium Silicate as CO_2-Absorbent

作　　者：王银杰[1] 其鲁[2] 江卫军[2] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081 [2]北京大学化学与分子工程学院应用化学系,北京100871

出　　处：《北京理工大学学报》2006年第5期458-460,467,共4页Transactions of Beijing Institute of Technology

基　　金：中信基金项目

摘　　要：以SiO2,Li2CO3为反应原料,通过高温固相反应法,在添加不同比例的K2CO2的条件下,合成出系列可在高温500 750℃区间直接吸收CO2的硅酸锂材料.采用扫描电子显微镜（SEM）、X-射线粉末衍射仪（XRD）分别观察和评价了制备材料的表面形貌与结构特征,用热重分析仪（TG）研究了硅酸锂材料吸收CO2的性能.实验结果表明,通过掺杂适量的K元素,能够提高硅酸锂材料吸收CO2的性能,在CO2气氛下,于700℃保持约15 min即可达到吸收平衡,材料的质量分数约达48%.Using Li2CO3, SiO2, and K2CO3 as the starting materials, potassium-doped lithium silicate absorbents were prepared by high-temperature solid-state reaction. The influence of doping potassium on the crystal structure of the prepared absorbents was studied by comparison of their XRD patterns. The microscopic morphologies of absorbents with different K2CO3 content were viewed by sanning electron microscopy. Their CO2-absorption abilities were measured with a thermogravimetric analyzer. The experimental results showed that doping of potassium could improve appreciably the CO2-absorption ability of lithium silicate. It was found that lithium silicate absorbed as much as about 48% （weight ratio） of CO2 under CO2 atmosphere at 700℃ within 15 min.

关 键 词：硅酸锂 吸收CO2 掺杂 

分 类 号：O641.111[理学—物理化学] O641.41[理学—化学]