Variable temperature FT-IR studies on hydrogen adsorption on the zeolite (Mg,Na)-Y

被引：31

作者：

Arean, C. Otero ^{[1
]}

Palomino, G. Turnes ^{[1
]}

Carayol, M. R. Llop ^{[1
]}

机构：

[1] Univ Balearic Isl, Dept Quim, Palma de Mallorca, Spain

来源：

APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 13期

关键词：

adsorption enthalpy; hydrogen adsorption; hydrogen storage; infrared spectroscopy; zeolites;

D O I：

10.1016/j.apsusc.2006.12.050

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：

Variable-temperature infrared spectroscopy was used for the thermodynamic studies on the adsorption of hydrogen on the zeolite (Mg,Na)-Y. Adsorption renders the H-H stretching mode infrared active, and simultaneous measurement of IR absorbance and hydrogen equilibrium pressure, over a range of temperature, allowed adsorption enthalpy and entropy to be determined. The standard adsorption enthalpy and entropy resulted to be AH(o) = - 18.2(+/- 0.8) kJ mol(-1) and AS(o) = - 136(+/- 10) J mol(-1) K-1, respectively. The adsorption enthalpy is substantially higher than the hydrogen liquefaction heat, which suggests that magnesium-containing porous materials are potential candidates in the search for suitable adsorbents for reversible hydrogen storage. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：5701 / 5704

页数：4