Pd-CeO₂ catalyst facilely derived from one-pot generated Pd@Ce-BTC for low temperature CO oxidation

Area of Science:

• Environmental catalysis
• Materials science
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) offer abundant catalytic sites for environmental applications.
• Developing efficient and eco-friendly MOF preparation methods is crucial for industrial use.
• Traditional methods for preparing MOF-based catalysts can be complex and less effective.

Purpose of the Study:

• To develop a novel one-pot synthesis for palladium supported on Ce-BTC (Pd@Ce-BTC).
• To compare the catalytic activity of Pd@Ce-BTC with traditional Pd/Ce-BTC catalysts for CO oxidation.
• To investigate the reasons behind the enhanced catalytic performance of the novel catalysts.

Main Methods:

• A one-pot solvothermal method was employed to synthesize Pd@Ce-BTC.
• Catalysts were pyrolyzed under different atmospheres (N2 or air).
• Catalytic activity for CO oxidation was evaluated, and materials were characterized.

Main Results:

• Pd@Ce-BTC derived catalysts showed significantly higher CO oxidation activity than Pd/Ce-BTC catalysts.
• Catalysts pyrolyzed in N2 flow (Pd@Ce-BTC-N) exhibited superior CO oxidation performance compared to those pyrolyzed in air.
• Enhanced activity was attributed to abundant surface Ce3+ species, rich adsorbed oxygen, and superior redox properties.

Conclusions:

• The one-pot solvothermal method offers an effective route for preparing highly active MOF-based catalysts.
• Pd@Ce-BTC catalysts, particularly when pyrolyzed in N2, demonstrate excellent potential for environmental catalysis, specifically CO oxidation.
• Understanding the surface properties and redox behavior is key to optimizing MOF catalyst design.