Abstract
Potassium-based sorbent was prepared by impregnation with potassium carbonate on activated carbon. The role of water and its effects on pretreatment and CO2 absorption was investigated in a fixed bed reactor. K2CO3 could be easily converted into K2CO3·1.5H2O working as an active species by the absorption of water vapor as the following reaction: K2CO3+3/2 H2O→K2CO3·1.5H2O. One mole of K2CO3·1.5H2O absorbed one mole of CO2 as the following reaction: K2CO3·1.5H2O+CO2ai2KHCO3+0.5 H2O. The K2CO3·1.5H2O phase, however, was easily transformed to the K2CO3 phase by thermal desorption even at low temperature under low relative humidity. To enhance CO2 capture capacity and CO2 absorption rate, it is very important to maintain the K2CO3·1.5H2O phase worked as an active species, as well as to convert the entire K2CO3 to the K2CO3·1.5H2O phase during CO2 absorption at a temperature range between 50 °C and 70 °C. As a result, the relative humidity plays a very important role in preventing the transformation from K2CO3·1.5H2O to the original phase (K2CO3) as well as in producing the K2CO3·1.5H2O from K2CO3, during CO2 absorption between 50 °C and 70 °C.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
D. P. Hagewiesche, S. S. Ashour, H. A. Al-Ghawas and O. C. Sandall, Chem. Eng. Sci., 50(7), 1071 (1995).
B. D. Lee, D. M. Kim, J. H. Cho and S.W. Park, Korean J. Chem. Eng., 26(3), 818 (2009).
R.V. Siriwardane, M. S. Shen, E. P. Fisher and J. A. Poston, Energy Fuels, 15, 279 (2001).
Y. Takamura, S. Narita, J. Aoki, S. Hironaka and S. Uchida, Sep. Purif. Technol., 24, 519 (2001).
M. Wilson, P. Tontiwachwuthikul, A. Chakma, R. Idem, A. Veawab, A. Aroonwilas, D. Gelowitz and J. C. Mariz, Energy, 29, 1257 (2004).
D. J. Fauth, E. A. Frommell, J. S. Hoffman R. P. Reasbeck and H.W. Pennline, Fuel Process. Technol., 86, 1503 (2005).
B. Ficicilar and T. Dogu, Catal. Today, 115, 274 (2006).
H. Hayashi, J. Taniuchi, N. Furuyashiki, S. Sugiyama, S. Hirano, N. Shigemoto and T. Nonaka, Ind. Eng. Chem. Res., 37, 185 (1998).
S. C. Lee, B.Y. Choi, S. J. Lee, S.Y. Jung, C. K. Ryu and J. C. Kim, Stud. Surf. Sci. Catal., 153, 527 (2004).
S. C. Lee and J. C. Kim, Catal. Surv. Asia, 11(4), 171 (2007).
S. C. Lee, B.Y. Choi, C. K. Ryu, Y. S. Ahn, T. J. Lee and J. C. Kim, Korean J. Chem. Eng., 23(3), 374 (2006).
S. C. Lee, B.Y. Choi, T. J. Lee, C. K. Ryu, Y. S. Ahnand J. C. Kim, Catal. Today, 111, 385 (2006).
S. C. Lee, H. J. Chae, B.Y. Choi, S. J. Lee, C. K. Yi, J. B. Lee, C. K. Ryu and J. C. Kim, Environ. Sci. Technol., 42, 2736 (2008).
S. C. Lee, H. J. Chae, S. J. Lee, Y. H. Park, C. K. Ryu, C. K. Yi and J. C. Kim, J. Mol. Catal. B: Enzym., 56(2–3), 179 (2009).
Y. Liang, D. P. Harrison, R. P. Gupta, D. A. Green and W. J. McMichael, Energy & Fuels, 18, 569 (2004).
H. Lu, E. P. Reddy and P.G. Smirniotis, Ind. Eng. Chem. Res., 45, 3944 (2006).
T.A. Nalette, P. J. Birbara and J. R. Aylward, US Patent, 5,079,209 (1992).
A.G. Okunev, V. E. Sharonov, Y. I. Aistov and V.N. Parmon, React. Kinet. Catal. Lett., 71(2), 355 (2000).
S.W. Park, D. H. Sung, B. S. Choi, K. J. Oh and K. H. Moon, Sep. Sci. Technol., 41(12), 2665 (2006).
R.V. Siriwardane, C. Robinson, M. Shen and T. Simony, Energy Fuels, 21, 2088 (2007).
J. I. Yang and J. N. Kim, Korean J. Chem. Eng., 23(1), 77 (2006).
C.W. Zhao, X. P. Chen and C. S. Zhao, Chemosphere, 75, 1401 (2009).
S. C. Lee, Y.M. Kwon, Y. H. Park, W. S. Lee, J. J. Park, C. K. Ryu, C. K. Yi and J. C. Kim, Top. Catal., 53(7), 641 (2010).
C.W. Zhao, X. P. Chen and C. S. Zhao, Energy Fuels, 23(9), 4683 (2009).
Y.W. Seo, S. H. Jo, C. K. Ryu and C. K. Yi, Chemosphere, 69, 712 (2007).
Y.W. Seo, S. H. Jo, H. J. Ryu, D. H. Bae, C. K. Ryu and C. K. Yi, Korean J. Chem. Eng., 24(3), 457 (2007).
C. K. Yi, S. H. Jo and Y.W. Seo, J. Chem. Eng. Jpn., 41(7), 691 (2008).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lee, S.C., Chae, H.J., Choi, B.Y. et al. The effect of relative humidity on CO2 capture capacity of potassium-based sorbents. Korean J. Chem. Eng. 28, 480–486 (2011). https://doi.org/10.1007/s11814-010-0398-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-010-0398-x