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Water vapor adsorbent for adsorption heat pump, method for producing water vapor adsorbent, and adsorption heat pump including water vapor adsorbent
Water vapor adsorbent for adsorption heat pump, method for producing water vapor adsorbent, and adsorption heat pump including water vapor adsorbent
There is provided a water vapor adsorbent for adsorption heat pumps that has high adsorption and desorption performance and high water resistance, such as submersion resistance. The water vapor adsorbent contains a zeolite that contains at least a silicon atom, an aluminum atom, and a phosphorus atom in its framework structure and that has a framework density of 12.0 T/1,000 cubic angstroms or more and 16.0 T/1,000 cubic angstroms or less, wherein the water vapor adsorbent contains a group 11 metal of the periodic table, which constitutes 0.1% to 15% by weight of the zeolite. In the zeolite containing the group 11 metal, an ion of the group 11 metal substitutes for a Bronsted acid site, which promotes a hydrolysis reaction of the zeolite, and decreases the number of Bronsted acid sites of the zeolite, thereby improving the water resistance, such as submersion resistance, of the zeolite.
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