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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.5.340

Preparation and Pervaporative Alcohol Dehydration of Crystallographically b/c-axis Oriented Mordenite Zeolite Membranes  

Kim, Young-Mu (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Lee, Du-Hyoung (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Kim, Min-Zy (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Cho, Churl-Hee (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
Publication Information
Membrane Journal / v.28, no.5, 2018 , pp. 340-350 More about this Journal
Abstract
In the present study, crystallographically b- and c-axis oriented mordenite zeolite membranes were prepared and their pervaporative ethanol dehydration was investigated. The seed layer with a high coverage grew to be c-axis oriented dense layer, while the seed layer with a low coverage grew to be b-axis oriented layer. This phenomenon could be explained by the evolutionary selection growth mechanism. The b-axis grown membrane with 8-membered rings showed a high separation factor of above 1000 and a considerable total flux of around $0.2kg/m^2h$. The c-axis grown, columnar structured membrane with 8- and 12-membered rings showed a low separation factor of less than 200 and a relatively high total flux of around $0.25kg/m^2h$. The high performance of b-axis grown membrane was due to the relatively small opening of 8-membered rings. Water molecules can freely permeate through the openings, but ethanol molecules, difficultly. Therefore, in the present study, we introduced a new method to control crystallographic orientation of mordenite membrane by changing seeding amount of needle-like crystals, and elucidated that b-axis oriented mordenite membrane showed better performance than c-axis grown mordenite membrane.
Keywords
mordenite zeolite membrane; crystallographic orientation; needle-like seed; pervaporation; ethanol dehydration;
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