Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg₂(dobdc)

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• 作者：Yan Cao ; Fujiao Song ; Yunxia Zhao ; Qin Zhong
• 关键词：metal-organic framework ; amine modification ; carbon dioxide adsorption
• 刊名：Journal of Environmental Sciences
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：25
• 期：10
• 页码：2081-2087
• 全文大小：324 K

文摘

Carbon dioxide (CO₂) adsorption on a standard metal-organic framework Mg₂(dobdc) (Mg/DOBDC or Mg-MOF-74) and a tetraethylenepentamine (TEPA) modified Mg₂ (dobdc) (TEPA-Mg/DOBDC) were investigated and compared. The structural information, surface chemistry and thermal behavior of the adsorbent samples were characterized by X-ray powder diffraction (XRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA) and nitrogen adsorption-desorption isotherm analysis. CO₂ adsorption capacity was measured by dynamic adsorption experiments with N₂-CO₂ mixed gases at 60¡ãC. Results showed that the CO₂ adsorption capacity of Mg/DOBDC was significantly improved after amine modification, with an increase from 2.67 to 6.06 mmol CO₂/g adsorbent. Moreover, CO₂ adsorption on the TEPA-Mg/DOBDC adsorbent was promoted by water vapor, and the adsorption capacity was enhanced to 8.31 mmol CO₂/g absorbent. The adsorption capacity of the TEPA-Mg/DOBDC adsorbent dropped only 3 % after 5 consecutive adsorption/desorption cycles. Therefore, this kind of adsorbent can be considered as a promising material for the capture of CO₂ from flue gas.