Abstract
The effect of alkali metal ions on the crystal structure of zeolites and layered silicates synthesized by a solid-state transformation was investigated. The compounds were prepared using a silica sol, tetrabutylammonium hydroxide (TBAOH) and alkali metal ions. Addition of a small amount of alkali ions to a silica gel containing TBAOH resulted in silicalite-1, silicalite-1/silicalite-2 intergrowth or an unknown phase. However, addition of a large amount of K, Rb or Cs ions led to the formation of fibrous layered silicates (CsLSN, RbLSN and KLSN), which were composed of the alkali metal ions and novel linear Si−O−Si−O chains, characterized by their 29 Si MAS NMR spectra and XRD patterns.
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