Adsorption equilibrium for sulfur dioxide, nitric oxide, carbon dioxide, nitrogen on 13X and 5A zeolites

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• 作者：Hua Deng ; Honghong Yi ; ^{yhhtxl@163.com} ; Xiaolong Tang ; Qiongfen Yu ; Ping Ning ; Liping Yang
• 关键词：Simultaneous desulfurization denitrification ; Carbon capture ; Isotherm ; Zeolite ; Thermodynamics
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 April, 2012
• 卷：188
• 期：Complete
• 页码：77-85
• 文件大小：1630 K

摘要

For developing a single adsorption system to remove SO₂, NO, and CO₂ in flue gas simultaneously, the equilibrium adsorption behavior for main pollutants on candidate adsorbents were investigated and compared. The adsorption equilibrium isotherms for SO₂, NO, CO₂ and N₂ on 13X and 5A zeolites were obtained at varied temperatures by a static volume instrument respectively. Henry's law constant and selectivity were investigated to understand adsorbent and adsorbate affinity. In order to compare the shape differences among the isotherms, a new isotherm shape parameter was constructed and morphogenesis for isotherms was also discussed. Finally, thermodynamic functions integral Gibbs鈥?free energy, enthalpy and entropy were calculated to characterize adsorption behavior. It was found that adsorption affinity follow the order SO₂ > CO₂ > NO > N₂ on both zeolites, Henry's law constant values of SO₂, NO, CO₂ are at least 118, 4, 11 times higher than that of N₂, respectively. The affinity effect likely attributes to the sum of adsorbate molecular multipole moments and polarizability. Isotherms of SO₂ and NO exhibit higher degree of curvature and morphogenesis of their isotherms are probably decided by adsorbate-adsorbent interaction transition. Molecule CO₂ exhibits the most efficient molecule packing on both zeolites, while SO₂ takes the highest freedom in cavities. Better performance is found on 5A than 13X zeolite at adsorbing SO₂, NO and CO₂ through multi-component adsorption equilibrium simulation.