Adsorption of hydrogen and deuterium in MnO2 modified NaX zeolites

被引：11

作者：

Shi, Jinsong ^{[1
]}

Li, Jing ^{[1
]}

Wu, Erdong ^{[1
]}

机构：

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

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2012年 / 152卷

基金：

中国国家自然科学基金;

关键词：

Zeolite; Hydrogen adsorption; Surface modification; Kubas interaction; SIGMA-BOND; STORAGE; PHYSISORPTION; COORDINATION; SPILLOVER; ISOTOPES; MOO3;

D O I：

10.1016/j.micromeso.2011.11.029

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

MnO2 modified NaX zeolites are prepared by dispersion of MnO2 on the surface of NaX in a calcination process. XRD, XPS and N-2 adsorption tests confirm that the dispersed MnO2 is primarily monolayer and the calcination conditions affect the dispersion efficiency. The adsorption performances of hydrogen and deuterium of the modified zeolites are investigated at both 77 K and 295 K. A hydrogen adsorption capacity increase up to 30% is observed at 295 K for NaX with moderate MnO2 modification, but the corresponding adsorption at 77 K does not show much improvement, and even deteriorates for the samples with high MnO2 contents. NaX shows an adsorption capacity difference of 11% between hydrogen and deuterium at 9 bar and 77 K, higher than that of MnO2 modified samples (4%); while the difference is much smaller at 295 K for all samples. The effects of MnO2 modification on hydrogen adsorption properties are explained by the involvement of Kubas interaction, where Mn in MnO2 acts as a d-electron donor for the enhanced binding of hydrogen molecules. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：219 / 223

页数：5

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