Dehydration and hydration behavior of metal-salt-modified materials for chemical heat pumps

被引：72

作者：

Ishitobi, Hirokazu ^{[1
]}

Uruma, Keirei ^{[2
]}

Takeuchi, Masato ^{[3
]}

Ryu, Junichi ^{[2
]}

Kato, Yukitaka ^{[2
]}

机构：

[1] Tokyo Inst Technol, Dept Nucl Engn, Meguro Ku, Tokyo 1528550, Japan

[2] Tokyo Inst Technol, Nucl Reactors Res Lab, Meguro Ku, Tokyo 1528550, Japan

[3] Osaka Prefecture Univ, Dept Appl Chem, Grad Sch Engn, Naka Ku, Sakai, Osaka 5998531, Japan

来源：

APPLIED THERMAL ENGINEERING | 2013年 / 50卷 / 02期

关键词：

Chemical heat pump; Thermal energy storage; Dehydration reaction; Hydration reaction; Gas-solid reaction; MAGNESIUM-HYDROXIDE; THERMAL DECOMPOSITION; OXIDE; SPECTROSCOPY; ABSORPTION; SURFACES; KINETICS; ENERGY; H2O;

D O I：

10.1016/j.applthermaleng.2011.07.020

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Lithium chloride (LiCl) modified magnesium hydroxide (Mg(OH)(2)) is a potential new material for chemical heat pumps. However, there is insufficient information concerning its dehydration and hydration behavior. In this study, the dehydration and hydration reactions, corresponding to the heat storage and the heat output operations, respectively, of authentic Mg(OH)(2) and LiCl-modified Mg(OH)(2) were investigated by thermogravimetric methods and near infrared spectroscopy. The dehydration of authentic Mg(OH)(2) proceeded as a one-step reaction. In contrast, the dehydration of LiCl-modified Mg(OH)(2) occurred in two steps. The dehydration reaction rates were increased by LiCl modification of the Mg(OH)(2) surface, while the activation energy for the first-order dehydration reaction was lowered. The mechanism for the hydration reaction of magnesium oxide (MgO) was different to that for the hydration of LiCl-modified MgO. This difference was explained by the effect of the LiCl on the MgO particle surface. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1639 / 1644

页数：6

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