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Acta Physico-Chimica Sinica  2002, Vol. 18 Issue (07): 577-580    DOI: 10.3866/PKU.WHXB20020701
Communication     
Influence of Water on Adsorption Properties of Lithium Exchanged Low Silica X Zeolite
Jiang Hua;Zhao Bi-Ying;Xie You-Chang
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
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Abstract  This paper shows quantitatively the consequence of adsorbed water on N2 or O2 adsorbed on LiLSX lithium exchanged low silica X zeolite. In the range of 0~32 H2O/u.c.(unit cell), water present in LiLSX sharply declined the capacity for N2 or O2 adsorption. The reason is that the adsorption mainly occurs on the Li+ ions on the 32 SIII sites in LiLSX. When H2O molecules residual after the desorption of hydrated LiLSX are adsorbed tightly on Li+ at SIII site, they block the adsorption of nitrogen or oxygen. Water molecules introduced from outside into the dehydrated LiLSX influenc the adsorption of nitrogen less seriously than the residual water molecules do, because of the heterogeneity of adsorption sites and the diffusion behavior of water in LiLSX. When diffused into the inner part of a LiLSX particle, some water molecules may adsorb on weaker sites other than the strongest SIII sites.

Key wordsWater      Adsorption      Air separation      Low silica X zeolite     
Received: 11 March 2002      Published: 15 July 2002
Corresponding Authors: Xie You-Chang     E-mail: yxie@pku.edu.cn
Cite this article:

Jiang Hua;Zhao Bi-Ying;Xie You-Chang. Influence of Water on Adsorption Properties of Lithium Exchanged Low Silica X Zeolite. Acta Physico-Chimica Sinica, 2002, 18(07): 577-580.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20020701     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2002/V18/I07/577

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