TY - JOUR
T1 - Adsorption of low concentration CO 2 by modified carbon nanotubes under ambient temperature
AU - Ye, Qing
AU - Zhang, Yu
AU - Li, Ming
AU - Shi, Yao
PY - 2012
Y1 - 2012
N2 - Solid amine adsorbents for low concentration CO 2 removal were developed using carbon nanotubes (CNTs) impregnated with tetraethylenepentamine (TEPA) and triethylenetetramine (TETA). The adsorbents were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FITR), N 2 adsorption/desorption, elemental analysis and thermogravimetric analysis (TGA). After impregnation, the shapes, fundamental channels and pore structures of the adsorbents were unchanged. However, the surface area and pore volume decreased. The adsorption behavior toward low concentration CO 2 was investigated in a fixed-bed column. The results indicated that the adsorption capacity was enhanced substantially by modification. The CO 2 adsorption capacity of CNTs-TEPA was higher than that of CNTs-TETA with the same amount of amine loading. The adsorption capacity increased steadily from 126.7 to 139.3 mg·g -1 for CNTs-TEPA and from 101.2 to 110.4 mg·g -1 for CNTs-TETA as the temperature increased from 20 to 30 °C. The adsorption capacity of the raw CNTs experienced a modest increase, but began to decrease gradually with further temperature increases. Suyadal and Yasyerli deactivation models were applied to investigate the experimental breakthrough curves of raw and modified CNTs. It was concluded that the Yasyerli deactivation model is more appropriate to analyze the breakthrough curves of CO 2 adsorption on solid amine adsorbents.
AB - Solid amine adsorbents for low concentration CO 2 removal were developed using carbon nanotubes (CNTs) impregnated with tetraethylenepentamine (TEPA) and triethylenetetramine (TETA). The adsorbents were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FITR), N 2 adsorption/desorption, elemental analysis and thermogravimetric analysis (TGA). After impregnation, the shapes, fundamental channels and pore structures of the adsorbents were unchanged. However, the surface area and pore volume decreased. The adsorption behavior toward low concentration CO 2 was investigated in a fixed-bed column. The results indicated that the adsorption capacity was enhanced substantially by modification. The CO 2 adsorption capacity of CNTs-TEPA was higher than that of CNTs-TETA with the same amount of amine loading. The adsorption capacity increased steadily from 126.7 to 139.3 mg·g -1 for CNTs-TEPA and from 101.2 to 110.4 mg·g -1 for CNTs-TETA as the temperature increased from 20 to 30 °C. The adsorption capacity of the raw CNTs experienced a modest increase, but began to decrease gradually with further temperature increases. Suyadal and Yasyerli deactivation models were applied to investigate the experimental breakthrough curves of raw and modified CNTs. It was concluded that the Yasyerli deactivation model is more appropriate to analyze the breakthrough curves of CO 2 adsorption on solid amine adsorbents.
KW - Adsorption
KW - CO
KW - Carbon nanotube
KW - Deactivation model
KW - Tetraethylenepentamine
KW - Triethylenetetramine
UR - http://www.scopus.com/inward/record.url?scp=84860469311&partnerID=8YFLogxK
U2 - 10.3866/PKU.WHXB201202234
DO - 10.3866/PKU.WHXB201202234
M3 - 文章
AN - SCOPUS:84860469311
SN - 1000-6818
VL - 28
SP - 1223
EP - 1229
JO - Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica
JF - Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica
IS - 5
ER -