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.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
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
关键词
硅酸锂
吸收CO2
掺杂
lithium silicate
CO2-absorption
doping
