Targeted Synthesis of Two Super-Complex Zeolites with Embedded Isoreticular Structures

Area of Science:

• Materials Science
• Crystallography
• Chemistry

Background:

• A novel structural coding approach was recently proposed for zeolite structure solution, prediction, and synthesis.
• This approach enables the creation of new zeolites with increasing complexity and embedded isoreticular structures.

Purpose of the Study:

• To extend the novel structural coding approach to higher generation members of the RHO zeolite family.
• To predict and synthesize two new RHO-family zeolites, PST-26 and PST-28.

Main Methods:

• Utilized a structural coding approach for zeolite structure prediction and targeted synthesis.
• Employed powder X-ray and electron diffraction techniques to confirm zeolite crystallization.
• Investigated the influence of aluminate and water concentrations on structural expansion.

Main Results:

• Successfully predicted and synthesized two new RHO-family zeolites: PST-26 and PST-28.
• PST-26 and PST-28 exhibit significantly larger unit cell volumes compared to lower generation RHO-family zeolites.
• Confirmed crystallization of the new zeolites using powder X-ray and electron diffraction.

Conclusions:

• The extended structural coding approach is effective for generating higher generation zeolites with expanded structures.
• Aluminate and water concentrations are critical factors controlling structural expansion in embedded isoreticular zeolites.
• This work expands the library of RHO-family zeolites and demonstrates a powerful strategy for zeolite design.