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Capturing Different Intermediate Phases during Zeolite Synthesis.

Jinjin Zeng¹, German Sastre², Suk Bong Hong¹

¹Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang 37673, Korea.

Journal of the American Chemical Society

|September 24, 2024

Summary

Controlling sodium (Na+) and cesium (Cs+) ion ratios guides zeolite TNU-9 synthesis. This reveals kinetic control over intermediate phase formation, enabling tailored zeolite crystallization.

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Area of Science:

Materials Science
Chemical Engineering
Crystallography

Background:

Zeolite crystallization mechanisms remain poorly understood, hindering the design of custom zeolites.
Current synthesis methods lack precise control over nucleation and transformation pathways.

Purpose of the Study:

To investigate how the interplay of Na+ and Cs+ ions influences zeolite TNU-9 synthesis pathways.
To understand the kinetic versus thermodynamic control in intermediate phase formation during zeolite crystallization.

Main Methods:

Synthesis of zeolite TNU-9 using varying Na/Cs ratios with 1,4-bis(N-methylpyrrolidinium)butane.
Characterization of intermediate phases formed during synthesis.
Force field simulations to analyze nucleation control mechanisms.

Main Results:

Adjusting the Na/Cs ratio altered intermediate phases from bikitaite to analcime to MCM-22 precursor.
Bikitaite transformation to TNU-9 occurred at crystal surfaces, distinct from dissolution-recrystallization of other intermediates.
Force field simulations indicated kinetic, not thermodynamic, control over intermediate phase nucleation.

Conclusions:

Cooperative structure direction by Na+ and Cs+ ions is key to controlling zeolite TNU-9 crystallization pathways.
Understanding kinetic control offers new strategies for designing specific zeolite structures.
This research advances fundamental knowledge of zeolite formation mechanisms.