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http://dx.doi.org/10.5855/ENERGY.2014.23.4.160

Adsorption of water vapor on zeolites of different framework types and alkali ions  

Song, Ju-Sub (Graduate School of Energy Science and Technology, Chungnam National University)
Sharma, Pankaj (Graduate School of Energy Science and Technology, Chungnam National University)
Kim, Beom-Ju (Graduate School of Energy Science and Technology, Chungnam National University)
Kim, Min-Zi (Graduate School of Energy Science and Technology, Chungnam National University)
Han, Moon-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
Publication Information
Journal of Energy Engineering / v.23, no.4, 2014 , pp. 160-168 More about this Journal
Abstract
In the present study, water vapor adsorption was evaluated at 298.15K for 9 different zeolites having LTA, FAU, CHA, and RHO frameworks, and then effect of framework type, Si/Al molar ratio, and alkali ion type on water up-take was investigated. Zeolites showed water up-takes which were increased in an order of $RHO<CHA{\approx}LTA<FAU$ frameworks. NaY zeolite having FAU framework showed a water up-take of 406 mg/g at p/po=0.5. The up-take was a little larger than that of 13X zeolite with the same framework. Among LTA zeolites, Ca-type 5A zeolite showed the highest water adsorption (282 mg/g at p/po=0.5) which could be explained by the large pore volume. Both CHA zeolite with a Si/Al molar ratio of 2.35 and RHO zeolite with a Si/Al molar ratio of 3.56 showed considerable water up-takes, even though the Si/Al molar ratio was much larger than that of LTA zeolite. In the present study, it is announced that in addition to FAU and LTA zeolites, CHA and RHO zeolites can be a promising dehumidification adsorbent.
Keywords
zeolite; water vapor adsorption; structure; Si/Al molar ratio; alkali ion;
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