Preparation of a Completely Oriented Molecular Sieve Membrane.
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.
Ban
T
Department of Chemistry, Gifu University, 1-1 Yanagido, Gifu 501-1193 (Japan).
Ohwaki
T
Ohya
Y
Takahashi
Y