Preparation of Al-Containing ZSM-58 Zeolite Membranes Using Rapid Thermal Processing for CO₂/CH₄ Mixture Separation

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Zeolite membranes are crucial for gas separation.
• Cracking during synthesis, especially in DDR-type ZSM-58, limits their application.
• Thermal expansion mismatch between zeolite and substrate causes cracks during detemplating.

Purpose of the Study:

• To develop a reproducible method for crack-free DDR-type ZSM-58 zeolite membranes.
• To investigate the effect of rapid thermal processing (RTP) on membrane integrity and performance.
• To analyze the influence of silica-to-aluminum (Si/Al) ratio on RTP effectiveness.

Main Methods:

• Preparation of Al-containing ZSM-58 zeolite membranes with DDR topology.
• Application of rapid thermal processing (RTP) before conventional thermal calcination (CTC).
• Fourier-transform infrared (FTIR) spectroscopy to analyze zeolite structure and silanol condensation.

Main Results:

• Crack-free Al-containing ZSM-58 membranes were successfully synthesized using RTP.
• RTP ensured complete template removal and improved CO2/CH4 selectivity.
• RTP induced silanol condensation, forming siloxane bonds and enhancing thermal stress resistance.

Conclusions:

• RTP is an effective method for suppressing cracks in Al-containing ZSM-58 zeolite membranes.
• The developed method yields membranes with high CO2 permeance and selectivity.
• This approach offers a reproducible route to high-performance DDR zeolite membranes.