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- W2078410963 abstract "X-ray diffraction, elemental analysis, scanning electron microscopy, and 29Si magic angle spinning (MAS), 1H13C cross-polarization (CP) MAS and 1H29Si 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 mixtures. 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." @default.
- W2078410963 created "2016-06-24" @default.
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- W2078410963 date "1996-05-01" @default.
- W2078410963 modified "2023-09-26" @default.
- W2078410963 title "A mechanistic study of the synthesis of zeolite SSZ-24" @default.
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- W2078410963 doi "https://doi.org/10.1016/0927-6513(95)00094-1" @default.
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