摘要
用固相法合成了用来循环使用的吸收CO2的Li4SiO4材料。通过热力学分析、X射线衍射(XRD)、热重分析(TG)确定了合成条件;用热重分析(TG)仪研究Li4SiO4吸附CO2的性能;用扫描电子显微镜(SEM)来观察Li4SiO4吸附CO2前后表面微观形貌的变化特征。结果发现,在900℃烧结2h可以合成Li4SiO4;材料在600~720℃段吸附CO2反应最为活跃,最高吸附量可达29.16%(质量分数)左右;材料吸附CO2后在750℃开始脱出CO2,到900℃左右可脱附完全,再生为Li4SiO4;CO2的体积百分含量(分压)对Li4SiO4吸附CO2的速度和吸附量有明显影响;气氛相同时,气体流量对吸附速度和吸附量的影响不明显。
The reproducible lithium silicate(Li4SiO4) material used for adsorption of CO2 was synthesized with lithium carbonate(Li2CO3)and silicon dioxide(SiO2) at 900 ℃ in 2 hours,and their adsorption capability of CO2 were studied.The results showed: the reaction ofLi4SiO4 and CO2 was fast from 600 ℃ to 720 ℃,the most adsorption rate was 29.16%(wt%);the desorption of CO2 began in 750 ℃ andcompleted around 900℃,then the materials were regenerated to produce Li4SiO4;the volume percentage(or partial pressure) of CO2 wasobvious effect on the adsorption speed and the most adsorption rate for of materials;under the same condition,their adsorption capability ofCO2 cannot be influenced by the flow of gas.
出处
《工业加热》
CAS
2007年第5期4-7,共4页
Industrial Heating
基金
国家自然科学基金资助(50204007)
云南省教育厅科学研究基金项目资助(5Y0530D)