Reactor-based approach for achieving high-silica zeolites: a fed-batch strategy

High-silica zeolites are challenging to synthesize in hydroxide media using conventional batch reactors. This study advances beyond traditional batch crystallization methods by exploring a reactor-based strategy for tailoring zeolite properties through mid-way synthesis intervention. By employing the Fed-batch (FB) reactor strategy, we demonstrate that controlled addition of silica precursors at critical synthesis stages, without interrupting temperature or pressure conditions, grants an alternative pathway to high-silica zeolites. Two model systems were investigated: the transformation of FAU-to-CHA and FAU-to-LEV via interzeolite conversion (IZC). These controlled manipulations resulted in an elevated Si/Al ratio and distinct structural properties (e.g., internal silanols) in the final zeolites. The resulting materials were exhaustively characterized and tested in CO2 conversion, highlighting the potential of reactor-based approaches for designing tailored high-performance zeolite catalysts.

• Javdani A¹
• Ivanushkin G¹
• Sajid A¹
• Khan IA¹
• Khalil I^1,2
• Herrero P¹
• Ke Q¹
• Deneyer A¹
• Dusselier M¹

•   ¹Center for Sustainable Catalysis and Engineering (CSCE), KU Leuven, 3001 Heverlee, Belgium.
• ²Université Lyon 1, CNRS, IRCELYON, UMR 5256, Villeurbanne, France.

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