Recent Progress in Silicon Carbide-Based Membranes for Gas Separation.

Area of Science:

• Materials Science
• Chemical Engineering
• Membrane Technology

Background:

• Research on silicon carbide (SiC) membranes for gas separation has grown significantly.
• SiC membranes offer excellent thermal, oxidation, hydrothermal, and chemical resistance.

Purpose of the Study:

• To review the progress in SiC membrane preparation and applications for gas separation.
• To provide insights into controlling SiC membrane microstructures for optimal performance.

Main Methods:

• Focuses on precursor-derived ceramic approaches, including chemical vapor deposition (CVD)/chemical vapor infiltration (CVI) and pyrolysis of polymeric precursors.
• Discusses the impact of precursor selection, curing methods, and pyrolysis temperature on membrane properties.

Main Results:

• CVD/CVI routes yield dense SiC membranes suitable for small-molecule gas separation.
• Pyrolysis of polymeric precursors is a common and promising route, allowing microstructure control.
• SiC membranes exhibit high separation performance and robust stability.

Conclusions:

• SiC membranes are highly promising for high-temperature gas separation applications.
• Understanding the factors influencing microstructure evolution is key to developing advanced SiC membranes.
• This review offers guidance for SiC membrane development and gas separation optimization.