Li4SiO4对CO2捕集性能的实验研究

孙婷婷; 吴正舜; 刘晓燕; 唐宁路

Li₄SiO₄对CO₂捕集性能的实验研究

Experimental study on Li₄SiO₄ adsorption capability for CO₂ capture

摘要

摘要: 以Li₂CO₃和SiO₂为原料,通过高温固相合成法合成了CO₂捕集剂Li₄SiO₄,并用X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)对所合成的材料在CO₂捕集前后的晶相变化以及微观结构进行了表征。通过热重分析仪(TGA)研究了Li₄SiO₄材料吸附CO₂的性能,并在小型热态实验台架上进行了CO₂热态捕集实验。实验结果表明,Li₄SiO₄对CO₂的捕集性能受Li₄SiO₄合成温度、CO₂的吸附温度以及气体中CO₂含量的影响,在700 ℃下制得的Li₄SiO₄具有最佳的CO₂吸附特性,最大吸附增量可达34%。Li₄SiO₄的吸附能力随着CO₂含量和吸附时间的增加而增加,当CO₂浓度分别为75%、67%、60%时,700 ℃ Li₄SiO₄对CO₂最大吸附量分别可达6.68 mmol/g、3.37 mmol/g、2.02 mmol/g (理论量8.33 mmol/g)。

Abstract: Li₄SiO₄ used as a revolving CO₂ absorbent at determinate temperature can be synthesized with SiO₂ and Li₂CO₃ by solid state reaction at high temperature. The crystal structure and microstructure of Li₄SiO₄ were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. The CO₂-adsorption capability of Li₄SiO₄ was studied by TGA preliminarily, and then was tested in a small experimental apparatus. The results show that the CO₂-adsorption capability is influenced by the preparation temperature of Li₄SiO₄ synthesis, and it was the largest at 700 ℃. The maximum adsorption capability could achieve 34%. Besides, the adsorption capability increases as the adsorption temperature going up and longer time. When CO₂ concentration was 75%, 67%, 60%, the adsorption capability could respectively reach 6.68 mmol/g, 3.37 mmol/g, 2.02 mmol/g.

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Li4SiO4对CO2捕集性能的实验研究

Experimental study on Li4SiO4 adsorption capability for CO2 capture

Li₄SiO₄对CO₂捕集性能的实验研究

Experimental study on Li₄SiO₄ adsorption capability for CO₂ capture