研究论文

高温CO2吸附材料硅酸锂的制备及吸附过程研究

  • 翁端;万杰;冉锐
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  • 清华大学材料科学与工程系;先进材料教育部重点实验室,北京 100084

收稿日期: 2011-06-20

  修回日期: 2011-07-13

  网络出版日期: 2011-08-08

Synthesis and Adsorption Process of Lithium Taking Used as High-Temperature CO2 Sorbents

  • WENG Duan;WAN Jie;RAN Rui
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  • Key Lab for Advanced Materials of Ministry of Education; Department of Material Science and Engineering, Tsinghua University, Beijing 100084, China

Received date: 2011-06-20

  Revised date: 2011-07-13

  Online published: 2011-08-08

摘要

以硝酸锂、正硅酸乙酯等为原料,利用溶胶-凝胶法制备了硅酸锂高温CO2吸附材料,利用XRD考查了制备方法对样品物相的影响;通过程序升温、定温吸附测试对样品的CO2吸附性能进行了表征,并利用原位红外光谱技术初步分析了CO2在硅酸锂表面的吸附过程。结果表明,在硝酸锂-正硅酸乙酯-乙醇共水解体系中引入添加剂柠檬酸,可获得纯度在90%以上的单斜相硅酸锂。所制备的样品在2% CO2-He气氛下,450—500℃温度区间具有较好的吸附性能。低温下CO2吸附在碳酸锂表面,主要以碳酸氢盐形式存在,高温下主要以离子碳酸盐及卧式吸附碳酸盐等形式存在。

本文引用格式

翁端;万杰;冉锐 . 高温CO2吸附材料硅酸锂的制备及吸附过程研究[J]. 科技导报, 2011 , 29(22) : 25 -30 . DOI: 10.3981/j.issn.1000-7857.2011.22.001

Abstract

One of the high-temperature CO2 sorbents lithium orthosilicates (Li4SiO4) was synthesized by using sol-gel method. The structures and the adsorption properties of Li4SiO4 were investigated by XRD, temperature-programming tests, and isothermal tests. In-situ FTIR tests were carried out to analyze the adsorption species and procedure. The results show that high purity (more than 90%) monoclinic Li4SiO4 could be obtained by adding citric acid into the LiNO3-TEOs-Ethanol co-hydrolysis system. Such a Li4SiO4 material shows good CO2 adsorption performance in the atmosphere of 2% CO2 in He within the temperature range of 450-500℃. The major adsorption species on the surfaces of the samples are bicarbonates at lower adsorption temperature, and are ion-type carbonates and horizontal-type carbonates at higher temperature.
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