Cryoadsorption of hydrogen on divalent cation-exchanged X-zeolites

被引：16

作者：

Li, Jing ^{[1
]}

Wu, Erdong ^{[1
]}

Song, Jiangwei ^{[2
]}

Xiao, Fengshou ^{[2
]}

Geng, Changjian ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

[3] Northeastern Univ, Shenyang 110004, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 13期

关键词：

Hydrogen adsorption; Critical temperature; X-zeolite; Ion-exchange; METAL-IONS; ADSORPTION; STORAGE; CARBON; PHYSISORPTION; NAX; CONDENSATION; COMPRESSION; MOLECULES; BEHAVIOR;

D O I：

10.1016/j.ijhydene.2009.04.047

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The cryoadsorption of hydrogen on divalent cation-exchanged zeolites and its relation with exchanged ions is investigated by volume measurements per-formed at near critical temperatures of 140-35 K and pressures up to 7 MPa. The hydrogen uptakes of the zeolites follow an order of NaX > MgX > ZnX > NiX, as same as that of the stability of the ions, but opposite to the hydration tendency of the ions and the isosteric heat of the adsorption of the zeolites, which indicate that the redox potential of the ions in the zeolite is a dominant factor in hydrogen adsorption. The drop of excess adsorption to negative amount and the following recovery at near critical temperature and pressure are explained by a reversed effect of capillary condensation and the bias of the compressibility factor from the assumed equation of state. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：5458 / 5465

页数：8

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