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Citation: WANG Yin-Jie, QI Lu, DAI Ke-Hua. Effect of Na-doping on CO₂ Absorption of Li₄SiO₄[J]. Acta Physico-Chimica Sinica, ;2006, 22(07): 860-863. doi: 10.3866/PKU.WHXB20060718 shu

Effect of Na-doping on CO₂ Absorption of Li₄SiO₄

1.
School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China; Department of Applied Chemistry, College of Chemistry & Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 26 December 2005
Available Online: 27 June 2006

Sodium-doped lithium silicate as CO2 absorbent at 500 ℃ to 750 ℃ was prepared by high-temperature solid-state reaction. The influence of sodium doping on the crystal structure of the absorbent was studied by X-ray diffraction (XRD). The microscopic morphologies of the absorbents were observed by scanning electron microscopy (SEM). The CO2-absorption capacities were measured by a thermogravimetric analyzer, which showed that sodium doping could improve the CO2-absorption ability of lithium silicate. It was found that the absorbent possessed the best performance when n(SiO2):n(Li2CO3):n(Na2CO3)=1:1.96:0.04. The maximum amount of CO2 absorption arrives at (46±0.6)%(w) in CO2 atmosphere at 700 ℃ within 15 min. Moreover, the CO2 concentration in gas phase influences the rate of CO2 absorption.
- Lithium silicate;Absorption;Carbon dioxide;Doping;TG
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of Na-doping on CO₂ Absorption of Li₄SiO₄