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Preparation of a Completely Oriented Molecular Sieve Membrane
Author(s) -
Ban Takayuki,
Ohwaki Takafumi,
Ohya Yutaka,
Takahashi Yasutaka
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19991115)38:22<3324::aid-anie3324>3.0.co;2-j
Subject(s) - supersaturation , molecular sieve , zeolite , substrate (aquarium) , membrane , seed crystal , chemical engineering , materials science , hydroxymethyl , crystallography , morphology (biology) , ligand (biochemistry) , chemistry , stereochemistry , catalysis , organic chemistry , single crystal , biochemistry , oceanography , receptor , biology , engineering , genetics , geology
Growth of oriented seed crystals on a substrate led to a completely oriented and continuous membrane of LTA‐type zeolite. The seed crystals of cubic morphology were dip‐coated onto a tilted substrate (see schematic diagram) with the zeolite channels normal to the surface. The substrate was hydrothermally treated in a reaction mixture containing the organic ligand 2,2‐bis(hydroxymethyl)‐2,2′,2″‐nitrilotriethanol, which lowers the degree of supersaturation of [Al(OH) 4 ] − ions and preferentially facilitates the intergrowth of the seed crystals.