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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route
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Phase Transformation Behavior of a Two-Dimensional Zeolite
Juna Bae1, Magdalena O Cichocka2, Yi Zhang2
1Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
Angewandte Chemie (International Ed. in English)
|May 23, 2019
Summary
A new 2D zeolite, PST-9, transforms into EU-12 via single-layer folding, not dissolution. This reveals novel zeolite phase transformation mechanisms and highlights the role of organic structure-directing agents in crystal growth.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Catalysis
Background:
- Understanding phase transformation in solids is crucial for developing functional materials like zeolites.
- Two-dimensional (2D) zeolites offer advantages in catalysis due to improved site accessibility and shorter diffusion paths compared to 3D zeolites.
- Maintaining structural integrity and microporosity during organic structure-directing agent (SDA) removal is a significant challenge for 2D zeolites.
Purpose of the Study:
- To investigate the phase transformation mechanisms of a novel 2D zeolite, PST-9.
- To explore the structural changes of PST-9 during organic structure-directing agent removal.
- To determine the influence of synthesis conditions and organic SDAs on zeolite crystal growth pathways.
Main Methods:
- Synthesis of the 2D zeolite PST-9 using a multiple inorganic cation approach.
- Characterization of PST-9's structure and intralayer microporosity.
- Investigation of PST-9's transformation under crystallization conditions and comparison with dissolution/recrystallization routes.
- Analysis of the effect of different organic structure-directing agents (SDAs) on zeolite crystal growth.
Main Results:
- PST-9, a true layered zeolite, was synthesized and characterized.
- PST-9 transforms into the small-pore zeolite EU-12 via a single-layer folding process under its crystallization conditions.
- The transformation does not occur through a traditional dissolution/recrystallization pathway.
- Zeolite crystal growth pathways were shown to be dependent on the type of organic SDAs used.
Conclusions:
- The study reveals a novel single-layer folding mechanism for 2D zeolite phase transformation.
- PST-9 serves as a model material for understanding these unique transformation pathways.
- The findings emphasize the critical role of SDAs in directing zeolite crystal growth and structural evolution.
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