Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg2(dobdc) |
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Authors: | Yan Cao Fujiao Song Yunxia Zhao Qin Zhong |
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Affiliation: | School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224000, China;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; |
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Abstract: | 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°C. 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. |
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Keywords: | metal-organic framework amine modification carbon dioxide adsorption |
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