Abstract
This paper presents sorption properties of a selective water sorbent based on mesoporous KSKG silica gel as a host matrix and lithium bromide as a hygroscopic salt. Sorption isobars, isochores and isotherms measured at T=40–120°C and partial vapor pressures of 7.5–81.0 mbar indicated two types of water sorption: 1) formation of a solid crystalline LiBr monohydrate at low amounts of sorbed water, and 2) vapor absorption by the salt solution at higher sorptions. Sorption properties of the LiBr monohydrate are found to change significantly due to salt impregnation into the mesoporous silica gel, whereas the solution confinement to the mesopores did not change its water sorption properties as compared to the bulk solution. Desorption curves follow a first order kinetics in the temperature range of 60–130°C at different vapor pressures.
Similar content being viewed by others
References
Yu.I. Aristov, M.M. Tokarev, G. Cacciola, G. Restuccia:React. Kinet. Catal. Lett.,59, 325 (1996).
Yu.I. Aristov, M.M. Tokarev, G. Di Marco, G. Cacciola, G. Rectuccia, V.N. Parmon:Russ. J. Phys. Chem.,71, 253 (1997).
Yu.I. Aristov, G. Restuccia, M.M. Tokarev, G. Cacciola:React. Kinet. Catal. Lett.,59, 335 (1996).
G. Feuerecker, J. Scharfe, I. Greiter, C. Frank, G. Alefeld: AES,31,International Absorption Heat Pump Conference, 493, ASME 1993.
T. Uemura, S. Hasabo:Techn. Rep. Kansai Univ.,6, 31 (1964).
Gmelins Handbuch der Anorganischen Chemie, Lithium Ergänzungs band. /Hauptredakteur E.H.Erich Pietsch. Verlag Chemie GmbH, 1957.
L.A. McNeely:ASHRAE Trans.,85, 413 (1979).
S. Iyoki, T. Uemura:Int. J. Refrig.,12, 278 (1989).
K.R. Patil, A.D. Tripathi, G. Pathak, S.S. Katti:J. Chem. Ing. Data,35, 166 (1990).
E.A. Levitskii, Yu.I. Aristov, V.N. Parmon, M.M. Tokarev:Sol. Enegy Mater. Sol. Cells,44, N3, 219 (1996).
M.M. Tokarev, Yu.I. Aristov:React. Kinet. Catal. Lett.,62, 143 (1997).
R.V. Heiti, G. Thodos:Ind. Eng. Chem. Fundam.,25, 768 (1986).
N. Takefuji, T. Munakata:Technol. Repts Kyushu Univ.,59, 545 (1986).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gordeeva, L.G., Restuccia, G., Cacciola, G. et al. Selective water sorbents for multiple applications, 5. LiBr confined in mesopores of silica gel: Sorption properties. React Kinet Catal Lett 63, 81–88 (1998). https://doi.org/10.1007/BF02475434
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02475434