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Citation: Jiang Hua, Zhao Bi-Ying, Xie You-Chang. Influence of Water on Adsorption Properties of Lithium Exchanged Low Silica X Zeolite[J]. Acta Physico-Chimica Sinica, ;2002, 18(07): 577-580. doi: 10.3866/PKU.WHXB20020701 shu

Influence of Water on Adsorption Properties of Lithium Exchanged Low Silica X Zeolite

1.
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing　100871

Received Date: 11 March 2002
Available Online: 15 July 2002

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.
- Water;Adsorption;Air separation;Low silica X zeolite
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