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《Transactions of Beijing Institute of Technology》 2006-05
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Effect of Doping K Element on Properties of Lithium Silicate as CO_2-Absorbent

WANG Yin-jie~(1),QI Lu~2,JIANG Wei-jun~2(1.School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;2.Department of Applied Chemistry,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)  
Using Li_2CO_3,SiO_2,and K_2CO_3 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 K_2CO_3 content were viewed by sanning electron microscopy.Their CO_2-absorption abilities were measured with a thermogravimetric analyzer.The experimental results showed that doping of potassium could improve appreciably the CO_2-absorption ability of lithium silicate.It was found that lithium silicate absorbed as much as about 48%(weight ratio) of CO_2 under CO_2 atmosphere at 700?℃ within 15?min.
【Fund】: 中信基金项目
【CateGory Index】: O611.3
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