A Cost-Effective and Highly Stable Symmetric Porous-Supported Mixed-Conductor Ceramic Membrane for Pure Oxygen...

Area of Science:

• Materials Science
• Chemical Engineering
• Sustainable Energy

Background:

• Mixed ionic-electronic conducting (MIEC) membranes are crucial for sustainable energy technologies.
• Applications include oxygen production, hydrogen purification, catalysis, and CO2 capture.
• Developing robust and efficient MIEC membranes is a key research focus.

Purpose of the Study:

• To develop a graded porous-supported symmetric ceramic membrane for efficient oxygen transport.
• To evaluate the performance and stability of the membrane in various gas environments.
• To assess its potential for industrial applications.

Main Methods:

• Aqueous tape-casting method used to prepare a La2Ni0.95Mo0.05O4+δ (K2NiF4+δ-type oxide) membrane.
• Incorporation of graded porous support layers on a dense functional layer.
• Testing oxygen flux using air as feedstock and evaluating stability under CO2 and coke oven gas.

Main Results:

• Achieved an oxygen flux of 3.18 mL min-1 cm-2 (31.8 L min-1 m-2) with air feedstock.
• Demonstrated stable performance even in the presence of CO2 and coke oven gas.
• The graded porous support enhanced oxygen-ion transmission and mechanical robustness.

Conclusions:

• The developed membrane offers excellent air permeability and mechanical stability.
• Simple production and high output compared to hollow-fiber membranes.
• Low cost, CO2 tolerance, and long-term stability indicate significant industrial application potential.