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doi: 10.3850/978-981-08-7614-2_IMPRES029
Dehydration and Hydration Behavior of Magnesium-Aluminum Mixed Hydroxide for Chemical Heat Pump
Junichi Ryua, Rui Takahashi, Hirokazu Ishitobi, Yoshitomo Sato, Keirei Uruma and Yukitaka Kato
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22, O-okayama, Meguro-ku, Tokyo152-8550, Japan.
acyliu@nr.titech.ac.jp
ABSTRACT
The dehydration and hydration behavior of Mg-Al mixed hydroxides was studied to develop a new material for chemical heat storage. The mixing was expected to reduce the dehydration temperature of authentic magnesium hydroxide; this temperature corresponds to the temperature of heat storage operation. It was demonstrated that the dehydration of Mg- Al mixed hydroxides proceeded at around 250°C, which was lower than that in the case of authentic magnesium hydroxide. These hydroxides showed higher hydration reactivity than authentic magnesium oxide, under hydration at 110°C after dehydration at 250°C. These results indicate that Mg-Al mixed hydroxides are applicable for the utilization of industrial waste heat between 250 °C and 300°C.
Keywords: Chemical heat pump, Mixed hydroxide, Magnesium hydroxide, Dehydration, Hydration.
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