Bose, Ankita and Sen, Mitali and Das, Jugal Kishore and Das, Nandini (2014) Sonication mediated hydrothermal process - an efficient method for the rapid synthesis of DDR zeolite membranes. RSC Advances, 4 (36). pp. 19043-19052. ISSN 2046-2069

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The formation and growth of a DDR zeolite membrane was developed on the low cost indigenous clay-alumina substrate for separation of H-2 from H-2-CO2 mixture by selective deposition of oriented seed crystals, followed by secondary growth method with sonication mediated hydrothermal technique. The formation of free radicals by ultrasonic irradiation in the sonochemical method enhances the rate of nucleation which ultimately reduces the DDR zeolite crystallization time. Surface seeding not only accelerates the zeolite crystallization on the support surface but also enhances the formation of an homogenous zeolite membrane layer. The DDR seeds were synthesized by a sonication mediated hydrothermal technique within a short crystallization time i.e. 2 days and used to provide nucleation for the membrane growth. Accordingly DDR zeolite membranes were synthesized on seeded substrate within 5 days. The membrane thickness was found to be similar to 26 mu m. The synthesized membranes along with seed crystals were characterized by XRD, FTIR, FESEM and EDAX analysis. The performance of the membrane formed was evaluated by single gas as well as mixture gas permeation measurement for H-2 and CO2. The H-2-CO2 separation selectivity of the membrane increased up to 3.7 at room temperature which is more than the reported values. To the best of our knowledge, there is no report on the synthesis of a DDR zeolite membrane within 7 (2 days for seed crystal and 5 days for membrane synthesis) days by a secondary growth technique.

Item Type: Article
Subjects: Structural Clay Products
Divisions: Nano-Structured Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 18 Dec 2014 10:19
Last Modified: 18 Dec 2014 10:19

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