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Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg2(dobdc)
作者姓名:Yan Cao  Fujiao Song  Yunxia Zhao  Qin Zhong
作者单位: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;
摘    要:Carbon dioxide (CO2) adsorption on a standard metal-organic framework Mg2(dobdc) (Mg/DOBDC or Mg-MOF-74) and a tetraethylenepentamine (TEPA) modified Mgz(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℃. 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.

关 键 词:二氧化碳  烟道气  金属  骨架  X-射线粉末衍射  接枝  捕捉  吸附能力
收稿时间:13 December 2012
修稿时间:4/8/2013 12:00:00 AM

Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg2(dobdc)
Yan Cao,Fujiao Song,Yunxia Zhao,Qin Zhong.Capture of carbon dioxide from flue gas on TEPA-grafted metal-organic framework Mg2(dobdc)[J].Journal of Environmental Sciences,2013,25(10):2081-2087.
Authors:Yan Cao  Fujiao Song  Yunxia Zhao and Qin Zhong
Institution: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;
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.
Keywords:metal-organic framework  amine modification  carbon dioxide adsorption
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