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

Area of Science:

• Materials Science
• Chemical Engineering
• Catalysis

Background:

• Synthesizing high-silica zeolites in hydroxide media is difficult with traditional batch reactors.
• Conventional methods lack precise control over zeolite properties during synthesis.

Purpose of the Study:

• To explore a reactor-based strategy for tailoring zeolite properties.
• To investigate the Fed-batch (FB) reactor strategy for synthesizing high-silica zeolites.
• To demonstrate controlled synthesis via mid-way intervention.

Main Methods:

• Employed a Fed-batch (FB) reactor strategy for zeolite synthesis.
• Investigated interzeolite conversion (IZC) of FAU-to-CHA and FAU-to-LEV.
• Controlled addition of silica precursors without altering temperature or pressure.

Main Results:

• Achieved synthesis of high-silica zeolites through FB strategy.
• Observed elevated Si/Al ratios in the final zeolite products.
• Identified distinct structural properties, including internal silanols, due to controlled synthesis.

Conclusions:

• Reactor-based strategies, specifically FB, provide an alternative pathway for high-silica zeolite synthesis.
• Controlled synthesis enables tailoring of zeolite properties for enhanced performance.
• The developed zeolites show potential as high-performance catalysts for CO2 conversion.