Adsorption Equilibrium and Kinetics of CO2 and H2O on ActivatedCarbon

doi:10.3724/SP.J.1077.2012.00139

Abstract

Abstract:

Activated carbon is well applied in pressure swing adsorption process for CO₂capture. The real flue gas contains saturated water vapor as well. In this study, single and binary components adsorption equilibrium and kinetics of H₂O/CO₂ were studied according to their adsorption isotherms and breakthrough curves. Results showed that activated carbon could adsorb high amount of CO₂ and low amount of N₂, that showed a good CO₂/N₂selectivity. As activated carbon contains the functional groups, the activated carbon can adsorb large amount water at high water partial pressure. However, because of different CO₂ adsorption mechanism, water adsorption has almost no impact on CO₂ adsorption on activated carbon. The kinetics study showed that CO₂ adsorption velocity on activated carbon is much faster than that of H₂O.

Key words: carbon dioxide, water vapor, adsorption, isotherm, breakthrough

CLC Number:

TQ174

XU Dong, ZHANG Jun, LI Gang, XIAO Penny, WEBLEY Paul, ZHAI Yu-Chun. Adsorption Equilibrium and Kinetics of CO₂and H₂O on ActivatedCarbon[J]. Journal of Inorganic Materials, 2012, 27(2): 139-145.

Figures/Tables 11

Table 1 Physical properties of activated carbon

Property	Activated carbon
Original material	Coconut shell
Shape	Granular
Activated method	Steam
BET surface/(m²·g^-1)	921.7
Total pore volume /(cm³·g^-1)	0.37
Nominal pore size /nm	0.73

Fig. 1 SEM image of activated carbon

Fig. 2 Schematic diagram of the H2O/CO2 single & binary isothermal adsorption unit

Fig. 3 Diagram for breakthrough experiments

Fig. 4 Pore size distribution of activated carbon calculated from nitrogen and adsorption isotherms using DFT model

Fig. 5 IR analyses of activated carbon in different conditions

Fig. 6 Adsorption isotherms of CO2 and N2 onto activated carbon Dots are experimental results and lines represent model fitting by single site Langmuir equation

Fig. 7 Adsorption isotherms of water vapor onto activated carbon at (a) 25, 30 and 35℃ of experimental data, (b) 25, 35, 50 and 60℃ with model fitting data

Fig. 8 Single and binary adsorption isotherms of water vapor and CO2 onto activated carbon

Fig. 9 Both single and binary breakthrough curves for (a) CO2 and (b) H2O at the bed

Fig. 10 Temperature swing profiles in binary breakthrough experiments at flow of (a) 100 L/min and (b) 50 L/min

References 21

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Adsorption Equilibrium and Kinetics of CO₂and H₂O on ActivatedCarbon

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