Defective Ce-Mn solid solution loaded with Pd single atoms for an enhanced methane combustion reaction.

Area of Science:

• Catalysis
• Environmental Chemistry
• Materials Science

Background:

• Methane combustion is crucial for mitigating greenhouse gas emissions.
• Existing catalysts struggle with simultaneous low-temperature activity and high-temperature stability.

Purpose of the Study:

• To develop a highly active and stable catalyst for methane oxidation.
• To investigate the structure-activity relationship of single-atom catalysts.

Main Methods:

• Synthesis of palladium single atoms on a CeMn solid solution (Pd/CeMn-AR) via a one-pot auto-redox method.
• Evaluation of catalytic performance in methane oxidation.
• Characterization of catalyst properties and mechanistic studies.

Main Results:

• Pd/CeMn-AR exhibited superior low-temperature activity (T90 = 543 °C) compared to counterparts.
• The catalyst demonstrated excellent stability, retaining over 95% activity after 10 hours at 550-650 °C.
• Autoxidative synthesis enhanced oxygen vacancies and substrate adsorption.

Conclusions:

• The Pd/CeMn-AR catalyst offers enhanced activity and stability for methane oxidation.
• The strategy of single-atom decoration on CeMn solid solutions is effective for catalyst design.
• This work provides a pathway for developing efficient catalysts for environmental remediation.