A 36-ring zeolite with intrinsic cylindrical mesopores

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Stable extra-large pore zeolites are crucial for catalysis and molecular separation but are often microporous, hindering bulky substrate processing.
• Existing mesoporous zeolites typically feature elongated, non-circular pore apertures, limiting their utility.

Purpose of the Study:

• To report the synthesis and characterization of NJU120-6, a novel silicate zeolite with an intrinsic cylindrical mesoporous system.
• To highlight its unique structural features, including the largest known 36-ring windows, and assess its stability and potential applications.

Main Methods:

• Zeolite synthesis and structural characterization using advanced techniques.
• Determination of pore size, framework density, and pore volume.
• Thermal stability testing up to 1173 K.
• Evaluation of catalytic performance in reactions involving bulky molecules.

Main Results:

• NJU120-6 possesses an intrinsic cylindrical mesoporous system with the largest 36-ring windows (25.71 Å × 19.12 Å).
• It exhibits the lowest framework density (9.39 Si atoms nm⁻³) and high pore volume (0.66 cm³/g).
• The zeolite demonstrates excellent thermal stability up to 1173 K and can be functionalized with aluminum and titanium.

Conclusions:

• NJU120-6 represents a significant advancement in zeolite design, offering unprecedented pore dimensions for accommodating bulky molecules.
• Its stability and tunable composition make it a promising candidate for challenging catalytic cracking and oxidation reactions.
• This material opens new avenues for molecular separation and catalysis involving large substrates.