Effect of NaNO3 on MgO鈥揅aCO3 Absorbent for CO2 Capture at Warm Temperature

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• 作者：Xinfang Yang ; Lifeng Zhao ; Yunhan Xiao
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：December 19, 2013
• 年：2013
• 卷：27
• 期：12
• 页码：7645-7653
• 全文大小：670K
• 年卷期：v.27,no.12(December 19, 2013)
• ISSN：1520-5029

文摘

The effect of NaNO₃ on the activation of MgCO₃鈥揅aCO₃ double salts to form a MgO鈥揅aCO₃ absorbent and the cyclic CO₂ absorption ability of the obtained absorbent have been investigated to analyze the affecting mechanism of NaNO₃. The MgCO₃鈥揅aCO₃ double salts were prepared by two methods: coprecipitation of Mg(NO₃)₂, Ca(NO₃)₂, and Na₂CO₃ and modification of dolomite by NaNO₃. The results indicate that NaNO₃ has an obvious effect on lowering the activation temperature of the MgCO₃鈥揅aCO₃ double salts, and NaNO₃ is the key component in facilitating the CO₂ absorption by the MgO鈥揅aCO₃ absorbent. The affecting mechanism has also been analyzed using X-ray diffraction characterization, particle diameter distribution analysis, Brunauer鈥揈mmett鈥揟eller analysis, and the scanning electron microscopy characterization of the absorbents. The results indicate that the molten NaNO₃ facilitates the decomposition of MgCO₃ in MgCO₃鈥揅aCO₃ double salts, affects the crystal lattice of the activated absorbents, and favors the CO₂ absorption by improving the ion diffusion in the absorbent.