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

Haoyang Liu1,2, Huilin Wang1,2, Xiang Chu1,2

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. wanghl@ciac.ac.cn.

Dalton Transactions (Cambridge, England : 2003)
|May 2, 2025
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A novel palladium single-atom catalyst on a cerium-manganese solid solution (Pd/CeMn-AR) effectively oxidizes methane at lower temperatures and maintains stability at high temperatures, offering a promising solution for greenhouse gas mitigation.

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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.