Naskar, Milan Kanti and Kundu, Debtosh and Chatterjee, Minati (2011) Influence of PVP buffer layer on the formation of NaA zeolite membrane. Journal of Porous Materials, 18 (3). pp. 319-327. ISSN 1380-2224

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The support substrates were modified with the aqueous solutions of 1 and 3 wt% of polyvinyl pyrrolidine (PVP) as intermediate buffer layer followed by NaA zeolite seed (prepared hydrothermally at 85 A degrees C for 2 h) coating with 2.5 wt% aqueous dispersion in each case. A better surface coverage with the oriented layer of NaA seed crystals was found with 1 wt% PVP buffer layer. The secondary crystallization of NaA membranes in the PVP-seed-coated supports was carried out hydrothermally at 65 A degrees C for 2, 4, 6 h (single-stage each) and (2 + 2), (4 + 2)h (double-stage each) crystal growth processes. The crystallization behaviours of NaA membranes were studied by X-ray diffraction (XRD) while the microstructures of the same films were observed by scanning electron microscope (SEM). The single-stage secondary crystallization at 65 A degrees C for 4 h showed highly interlocked and oriented NaA grains in the membranes and it rendered the permeance value of 2.2 x 10(-8) mol m(-2)s(-1)Pa(-1) for single gas, nitrogen (N(2)) at ambient temperature (30 A degrees C).

Item Type: Article
Uncontrolled Keywords: PVP buffer layer; Seed crystals; Hydrothermal synthesis; NaA zeolite membrane; Secondary crystallization; Permeance
Subjects: Structural Clay Products
Divisions: Sol Gel
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Jan 2012 12:08
Last Modified: 25 Feb 2013 08:23

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