Adsorption Properties of the Lithium Bromide-Water System in Pores of Extended Graphite, Sibunit, and Alumna Full article
| Journal |
Russian Journal of Physical Chemistry A
ISSN: 0036-0244 , E-ISSN: 1531-863X |
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| Output data | Year: 2000, Volume: 74, Number: 12, Pages: 2016-2020 Pages count : 5 | ||||
| Tags | SILICA-GEL PORES; MULTIPLE APPLICATIONS; SORPTION PROPERTIES; VAPOR-PRESSURE; SORBENTS; MESOPORES; LiBr | ||||
| Authors |
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| Affiliations |
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Funding (3)
| 1 | Russian Foundation for Basic Research | 99-03-32312 |
| 2 | Russian Foundation for Basic Research | 99-03-32356 |
| 3 | Siberian Branch of the Russian Academy of Sciences | 3 |
Abstract:
The sorption equilibrium of lithium bromide dispersed in pores of gamma -alumna, a synthetic carbon material (extended graphite and Sibunit) with water vapor, was studied by thermogravimetry over the temperature range from 30 to 135 °С at a water vapor pressure of p(H2O) = 6.0-81.0 mbar, It was established that the main characteristics of the sorption equilibrium under study are determined by the dispersion characteristics of the salt rather than by the chemical nature of the matrix. For matrices with an average pore diameter larger than 15 nm, the sorption at small relative pressures of water vapor is monovariant and results in the formation of the LiBr .H2O crystal monohydrate; a further sorption is accompanied by the formation of an aqueous solution of the salt, and the equilibrium becomes bivariant. The sorption properties of crystal hydrates and solutions formed in such pores are similar to those of the LiBr-H2O bulk system. For LiBr dispersed in pores with an average diameter smaller than 8 nm, the sorption equilibrium is bivariant in the entire range of sorption values, which means that no crystal hydrate is formed in such pores. A comparison with the LiBr-H2O bulk system shows that the sorption capacity of the dispersed salt increases in the range of existence of the bulk crystal hydrate and decreases in the range of existence of the solution. The isosteric heats of sorption of water vapor were determined.
Cite:
Gordeeva L.G.
, Restuccia G.
, Tokarev M.M.
, Cacciola G.
, Aristov Y.I.
Adsorption Properties of the Lithium Bromide-Water System in Pores of Extended Graphite, Sibunit, and Alumna
Russian Journal of Physical Chemistry A. 2000. V.74. N12. P.2016-2020. WOS Scopus РИНЦ
Adsorption Properties of the Lithium Bromide-Water System in Pores of Extended Graphite, Sibunit, and Alumna
Russian Journal of Physical Chemistry A. 2000. V.74. N12. P.2016-2020. WOS Scopus РИНЦ
Original:
Гордеева Л.Г.
, Restuccia G.
, Токарев М.М.
, Cacciola G.
, Аристов Ю.И.
Адсорбционные свойства системы «бромид лития - вода» в порах расширенного графита, Сибунита и оксида алюминия
Журнал физической химии. 2000. Т.74. №12. С.2211-2215. РИНЦ ANCAN
Адсорбционные свойства системы «бромид лития - вода» в порах расширенного графита, Сибунита и оксида алюминия
Журнал физической химии. 2000. Т.74. №12. С.2211-2215. РИНЦ ANCAN
Dates:
| Submitted: | Sep 20, 1999 |
| Published print: | Dec 1, 2000 |
Identifiers:
| Web of science: | WOS:000165862000019 |
| Scopus: | 2-s2.0-0034354236 |
| Elibrary: | 13338816 |