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April 1, 2026Open Access

Synthesis and Phase Relationships between Smectite and Low-silica Zeolites

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The study investigates the synthesis process and phase relationships between smectite and low-silica zeolites under hydrothermal conditions.
Synthesized low-silica zeolites and smectite from Si-Al hydrous oxides
Varied amounts of NaOH and time of hydrothermal treatment
Compared effects of NaOH and tetraethyl ammonium hydroxide on zeolite formation
Utilized SEM and TEM imaging for observing crystal formation
Zeolite structures shifted to lower Si/Al ratios with increased NaOH and hydrothermal treatment time
Ammonium smectite was produced without zeolite when using TEAOH
Zeolite nucleation occurred on clay surfaces when NaOH was added
Phase relationships aligned with calculated free energies and solubility data

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Hydrothermal synthesis reveals phase relationships in smectite and low-silica zeolites, suggesting industrial applications.

田崎 et al. (2006) studied this question.

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