Adsorption of SO2, NO, and CO2 on Activated Carbons: Equilibrium and Thermodynamics

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• 作者：Honghong Yi ; Zhixiang Wang ; Haiyan Liu ; Xiaolong Tang ; Ding Ma ; Shunzheng Zhao ; Bowen Zhang ; Fengyu Gao ; Yanran Zuo
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：May 8, 2014
• 年：2014
• 卷：59
• 期：5
• 页码：1556-1563
• 全文大小：432K
• 年卷期：v.59,no.5(May 8, 2014)
• ISSN：1520-5134

文摘

To investigate the coadsorption of SO₂, NO, and CO₂ from the flue gas, adsorption equilibrium tests of SO₂, NO, and CO₂ on coconut shell activated carbon (SAC) and coal-based activated carbon (CAC) were conducted at the temperatures (323, 343, and 363) K by the static volumetric method. The equilibrium data were well fitted by the Toth model. Henry鈥檚 constant was calculated by the Virial model; the results showed that adsorption affinity followed the order SO₂ > CO₂ > NO > N₂ on SAC, and SO₂ > NO > CO₂ > N₂ on CAC. Then thermodynamics data, including Gibbs鈥?free energy, entropy, and enthalpy, were also calculated to characterize adsorption behaviors. SO₂ had the highest degree of freedom, while CO₂ formed a most regular configuration. The efficiency of molecule packing in CAC was lower than that in SAC. Finally, competitive adsorption of different flue gas components was predicted by the extended Toth model. The adsorption amount followed the order CO₂ > N₂ > SO₂ > NO for both adsorbents. SAC had better adsorption property than CAC in the multicomponent adsorption.