期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 25, 期 10, 页码 2081-2087出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60267-8
关键词
metal-organic framework; amine modification; carbon dioxide adsorption
Carbon dioxide (CO2) adsorption on a standard metal-organic framework Mg-2(dobdc) (Mg/DOBDC or Mg-MOP-74) and a tetraethylenepentamine (TEPA) modified Mg-2(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 N-2-CO2 mixed gases at 60 degrees 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 11,PA-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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