Study on CO<sub>2</sub> adsorption properties of tetraethylenepentamine modified mesoporous silica gel

CHEN Lin-lin; WANG Xia; GUO Qing-jie

Volume 43 Issue 01

Jan. 2015

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CHEN Lin-lin, WANG Xia, GUO Qing-jie. Study on CO2 adsorption properties of tetraethylenepentamine modified mesoporous silica gel[J]. Journal of Fuel Chemistry and Technology, 2015, 43(01): 108-115.

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CHEN Lin-lin, WANG Xia, GUO Qing-jie. Study on CO₂ adsorption properties of tetraethylenepentamine modified mesoporous silica gel[J]. Journal of Fuel Chemistry and Technology, 2015, 43(01): 108-115.

CHEN Lin-lin, WANG Xia, GUO Qing-jie. Study on CO2 adsorption properties of tetraethylenepentamine modified mesoporous silica gel[J]. Journal of Fuel Chemistry and Technology, 2015, 43(01): 108-115.

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Study on CO₂ adsorption properties of tetraethylenepentamine modified mesoporous silica gel

Key Laboratory of Clean Chemical Processing of Shandong Province, Qingdao University of Science & Technology, Qingdao 266042, China

Received Date: 2014-07-31
Rev Recd Date: 2014-09-29
Publish Date: 2015-01-30

Abstract

Abstract

A novel tetraethylenepentamine (TEPA) modified mesoporous silica gel (SG) sorbent (TEPA-SG) for CO₂ capture was prepared by the wet impregnation method. The prepared samples were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and N₂ adsorption-desorption technologies. Meanwhile, the effects of TEPA loadings and adsorption temperatures on the adsorption capacity were investigated in a self-assembled fixed bed reactor. Different weight percentages of polyethylene glycol (PEG) were added to TEPA-SG to study the promoting effect of hydroxyl groups on the adsorption capacity and regenerability. The results show that the SG modified by 40% TEPA has a maximum adsorption capacity of 2.21 mmol/g at 70 ℃ and atmospheric pressure. Moreover, the adsorption capacity increases to 2.70 mmol/g by adding a desirable amount of PEG, and after ten cyclic adsorption-desorption tests, the adsorption capacity is maintained at 2.66 mmol/g, demonstrating that as-prepared TEPA and PEG modified sorbent displays an excellent regenerability. In addition, the isosteric heat of adsorption based on the Clasius-Clapeyron equation approaches 30~40 kJ/mol, and decreases gradually with increasing the adsorption capacity, indicating that the surface of TEPA30/PEG10-SG sorbent shows an energetic heterogeneity.
- mesoporous silica gel,
- tetraethylenepentamine,
- polyethylene glycol,
- CO₂ adsorption

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