Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg2(dobdc).
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 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 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.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. caoyan823@163.com
Yan
Y
Cao
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Fujiao
F
Song
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Yunxia
Y
Zhao
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Qin
Q
Zhong
D002245:Carbon Dioxide / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D014867:Water
D005029:Ethylenediamines; D005740:Gases; D017616:Magnesium Compounds; D014867:Water; D002245:Carbon Dioxide; C034269:tetraethylenepentamine