Effective C₄ Separation by Zeolite Metal-Organic Framework Composite Membranes

Area of Science:

• Materials Science
• Chemical Engineering
• Separation Science

Background:

• Inorganic zeolites offer superior molecular sieving but are challenging to process into usable macroscopic structures.
• Developing effective membranes for separating C4 hydrocarbons, particularly 1,3-butadiene, is vital for the chemical industry.

Purpose of the Study:

• To engineer zeolite-inorganic framework (MOF) glass interfaces for creating monolithic zeolite structures.
• To develop advanced membrane materials for challenging hydrocarbon separations.

Main Methods:

• Utilizing MOF glass as a substrate to stabilize and disperse discrete zeolite powders.
• Assembling zeolite powders within the MOF glass matrix to form monolithic structures.
• Testing the separation performance of the fabricated zeolite-MOF glass composite membranes.

Main Results:

• Zeolites were successfully dispersed and stabilized within the MOF glass matrix, forming mechanically stable monoliths.
• The composite membrane demonstrated effective separation of 1,3-butadiene (C4H6) from other C4 hydrocarbons.
• High permeance for C4H6 (693.00±21.83 GPU) and high selectivity over n-butene, n-butane, isobutene, and isobutane were achieved.

Conclusions:

• The MOF glass-substrate strategy enables the fabrication of monolithic zeolite membranes with good mechanical stability.
• This approach offers a promising pathway for developing advanced materials for difficult industrial hydrocarbon separations.