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Alkylammonium polycations as structure-directing agents in MFI zeolite synthesis

โœ Scribed by Larry W Beck; Mark E Davis

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
427 KB
Volume
22
Category
Article
ISSN
1387-1811

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โœฆ Synopsis

Silicate and aluminosilicate MFI-type zeolites are synthesized with di-and triquaternary ammonium cations as structure-directing agents (SDA). Solid-state NMR spectra show that polycations are intact in the as-synthesized zeolites. Materials synthesized with polycationic molecules are compared to zeolites synthesized with tetrapropylammonium, the normal SDA for MFI-type zeolite. The zeolite nucleation rates and particle sizes decrease as the net charge of the organic cation increases, i.e. SDAn+ where n=1, 2 or 3.

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This paper reports the microwave synthesis of MFI-type zeolite membranes by secondary growth of nanocrystalline silicalite seed layers in pure inorganic precursors. The inorganic precursor solutions contained SiO 2 , Al 2 (SO 4 ) 3 , NaOH, and H 2 O. It was found that the membrane formation and qual