TY - GEN
T1 - Comparison of CO 2 sorption on hydrotalcites by impregnated with various alkali metals
AU - Min, Yoon Jae
AU - Hong, Seok Min
AU - Lee, Ki Bong
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2011
Y1 - 2011
N2 - Carbon dioxide (CO 2) is a representative greenhouse gas causing global warming, and adsorption becomes a promising technology among many separation methods to capture CO 2. Inexpensive adsorbents with sufficient CO 2 adsorption uptake for low temperature have been widely developed, but their CO 2 adsorption ability is seriously impaired at high temperature. Thus, it is important to develop CO 2 sorbents for high temperature. Hydrotalcite (HTC), which has been known as an inorganic compound of Mg-Al layered double hydroxide, has many advantages of stable CO 2 sorption, fast sorption kinetics, and easy regeneration over other high temperature CO 2 sorbents. However CO 2 sorption uptake of pristine HTC is not high enough for practical use, thus CO 2 sorption uptake of HTC is usually enhanced by impregnation with alkali metals. So far, most enhancement of CO 2 sorption on HTC focused on using potassium carbonate as an impregnation agent. Other alkali metals such as Li, Na, Rb, and Cs were not systematically investigated. In this study, HTC was impregnated with various alkali metals in order to enhance the CO 2 sorption uptake and continuous sorption/desorption test was executed for the comparison of CO 2 sorption kinetics and stability of sorbents. Thermogravimetric analysis was used to measure CO 2 sorption uptake and the results revealed that CO 2 sorption uptake on HTC by impregnated with alkali metal was increased in the order of Na<Cs<K<Rb<Li. Also, the analyses based on N 2 adsorption, X-ray diffraction, scanning electron microscopy and infrared spectroscopy were carried out to elucidate the characteristics of sorbents and the mechanism of CO 2 sorption.
AB - Carbon dioxide (CO 2) is a representative greenhouse gas causing global warming, and adsorption becomes a promising technology among many separation methods to capture CO 2. Inexpensive adsorbents with sufficient CO 2 adsorption uptake for low temperature have been widely developed, but their CO 2 adsorption ability is seriously impaired at high temperature. Thus, it is important to develop CO 2 sorbents for high temperature. Hydrotalcite (HTC), which has been known as an inorganic compound of Mg-Al layered double hydroxide, has many advantages of stable CO 2 sorption, fast sorption kinetics, and easy regeneration over other high temperature CO 2 sorbents. However CO 2 sorption uptake of pristine HTC is not high enough for practical use, thus CO 2 sorption uptake of HTC is usually enhanced by impregnation with alkali metals. So far, most enhancement of CO 2 sorption on HTC focused on using potassium carbonate as an impregnation agent. Other alkali metals such as Li, Na, Rb, and Cs were not systematically investigated. In this study, HTC was impregnated with various alkali metals in order to enhance the CO 2 sorption uptake and continuous sorption/desorption test was executed for the comparison of CO 2 sorption kinetics and stability of sorbents. Thermogravimetric analysis was used to measure CO 2 sorption uptake and the results revealed that CO 2 sorption uptake on HTC by impregnated with alkali metal was increased in the order of Na<Cs<K<Rb<Li. Also, the analyses based on N 2 adsorption, X-ray diffraction, scanning electron microscopy and infrared spectroscopy were carried out to elucidate the characteristics of sorbents and the mechanism of CO 2 sorption.
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M3 - Conference contribution
AN - SCOPUS:84863148749
SN - 9780816910700
T3 - 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
BT - 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
T2 - 2011 AIChE Annual Meeting, 11AIChE
Y2 - 16 October 2011 through 21 October 2011
ER -