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Controlled Synthesis of a Thin LTL Zeolitic Membrane Using Nano‐Sized Seeds: Characterization and Permeation Performance
Author(s) -
Ghoroghchian F.,
Aghabozorg H.,
Farhadi F.,
Kazemian H.
Publication year - 2010
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200900543
Subject(s) - membrane , zeolite , permeation , materials science , chemical engineering , aluminosilicate , hydrothermal synthesis , nanoparticle , characterization (materials science) , selectivity , porosity , hydrothermal circulation , nanotechnology , chemistry , organic chemistry , composite material , catalysis , biochemistry , engineering
Industrial zeolitic membranes which offer a remarkable selectivity compared to polymeric membranes, suffer of the lower flux due of their larger thickness (e.g., 10–30 μm). This problem can be addressed by controlled synthesis of nanolayers, resulting in thinner membrane layers (e.g., 0.5–5 μm). An aluminosilicate gel with a molar composition of 20SiO 2 :Al 2 O 3 :10K 2 O:400H 2 O was used to prepare several membranes of zeolite L by means of a controlled hydrothermal synthesis on the surface of a porous alumina disc seeded with nanozeolite LTL crystals. Nanocrystallites of LTL zeolite with an average particle size of 80–100 nm were successfully synthesized and characterized. Using these nanoparticles as seeds, a zeolite L layer with an average thickness of 2 μm was synthesized on the alumina support at 150 °C.