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O2-assisted methane oxidation on single-atom Pd@SSZ-13: a combined first-principles and microkinetic study.

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Palladium catalysts on SSZ-13 zeolite efficiently oxidize methane via an O2-assisted pathway, crucial for greenhouse gas mitigation. This study reveals optimal conditions for complete methane conversion, enhancing catalyst design.

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Complete catalytic oxidation of methane is vital for mitigating greenhouse gas emissions and converting energy.
  • Palladium (Pd)-based catalysts are promising but face challenges in achieving high activity and stability.
  • Single-atom Pd supported on zeolites, like SSZ-13, offers a potential solution for enhanced catalytic performance.

Purpose of the Study:

  • To theoretically investigate methane oxidation over single-atom Pd supported on SSZ-13 zeolite (Pd@SSZ-13).
  • To determine activation barriers and identify optimal configurations for Pd incorporation.
  • To evaluate mechanistic routes and understand factors controlling catalytic activity and stability.

Main Methods:

  • Density Functional Theory (DFT) calculations to model catalytic processes.
  • Climbing-image nudged elastic band (CI-NEB) calculations to determine activation barriers.
  • Microkinetic analysis to assess temperature and pressure dependent reaction rates.

Main Results:

  • The O2-assisted oxidative dehydrogenation pathway is energetically favorable over direct dehydrogenation.
  • Oxygen-rich environments significantly improve the thermodynamic feasibility of complete methane oxidation.
  • Optimal methane conversion to CO2 and H2O occurs above 800 K, influenced by oxygen availability and water removal.

Conclusions:

  • O2-assisted and multi-site mechanisms offer low-energy pathways for methane oxidation.
  • Catalyst design should consider oxygen availability, water removal, and carbon site blocking for optimal performance.
  • This research provides key insights for developing efficient Pd-zeolite catalysts for methane conversion.