A mechanistic study of the synthesis of zeolite SSZ-24

C. S. Gittleman, Karen Watanabe-Sailor, A. T. Bell, C. J. Radke

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

X-ray diffraction, elemental analysis, scanning electron microscopy, and 29Si magic angle spinning (MAS), 1H-13C cross-polarization (CP) MAS and 1H-29Si CP MAS NMR spectroscopies are used to study SSZ-24 synthesis from aqueous silicate mixtures containing alkali and N,N,N-trimethyl-1-adamantammonium (TMAA+) cations. SSZ-24 only forms from mixtures prepared using fumed silica, KOH, and TMAAOH, with TMAA/Si≥0.15. SSZ-24 nuclei form through Van der Waals and coulombic interactions between the anionic silicate species and the TMAA+ cations in the gelatinous synthesis mixture. The results cannot distinguish whether SSZ-24 nuclei form in the liquid or solid phase of the synthesis mixture. No evidence was found for occlusion of the TMAA+ cations in the solid phase of the gel prior to SSZ-24 crystallization, suggesting that the rates of zeolite nucleation and crystallization may be comparable. Computer simulations reveal that the non-bonded interactions between TMAA+ and the SSZ-24 lattice are weaker than the non-bonded interactions between tetrapropylammonium (TPA+) cations and the silicalite-1 framework, which may explain why silicalite forms much faster than SSZ-24 when TPAOH is substituted for TMAAOH in the synthesis mixture.

Original languageEnglish (US)
Pages (from-to)131-150
Number of pages20
JournalMicroporous Materials
Volume6
Issue number3
StatePublished - 1996
Externally publishedYes

Fingerprint

Zeolites
Magic angle spinning
Cations
Positive ions
metal spinning
synthesis
cations
Silicates
cross polarization
Crystallization
solid phases
silicates
crystallization
Polarization
nuclei
occlusion
Alkalies
interactions
Silicon Dioxide
Nuclear magnetic resonance spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)

Cite this

Gittleman, C. S., Watanabe-Sailor, K., Bell, A. T., & Radke, C. J. (1996). A mechanistic study of the synthesis of zeolite SSZ-24. Microporous Materials, 6(3), 131-150.

A mechanistic study of the synthesis of zeolite SSZ-24. / Gittleman, C. S.; Watanabe-Sailor, Karen; Bell, A. T.; Radke, C. J.

In: Microporous Materials, Vol. 6, No. 3, 1996, p. 131-150.

Research output: Contribution to journalArticle

Gittleman, CS, Watanabe-Sailor, K, Bell, AT & Radke, CJ 1996, 'A mechanistic study of the synthesis of zeolite SSZ-24', Microporous Materials, vol. 6, no. 3, pp. 131-150.
Gittleman, C. S. ; Watanabe-Sailor, Karen ; Bell, A. T. ; Radke, C. J. / A mechanistic study of the synthesis of zeolite SSZ-24. In: Microporous Materials. 1996 ; Vol. 6, No. 3. pp. 131-150.
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