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Exploring the dynamic evolution of lattice oxygen on exsolved-Mn2O3@SmMn2O5 interfaces for NO Oxidation
Xiyang Wang1,2, Qilei Yang1, Xinbo Li3
1School of Environment, Tsinghua University, Beijing, PR China.
Nature Communications
|September 2, 2024
Summary
This study reveals how lattice oxygen in a novel Mn2O3/SmMn2O5 catalyst enhances diesel oxidation by activating NO oxidation. The catalyst shows superior performance and durability over traditional platinum catalysts.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Lattice oxygen in metal oxides is crucial for diesel oxidation catalysts.
- Atomic-level understanding of structural evolution during catalysis is limited.
Purpose of the Study:
- To explore the role of lattice oxygen in NO oxidation using a novel Mn2O3/SmMn2O5 catalyst.
- To elucidate the mechanism of NO oxidation at the atomic level.
Main Methods:
- Non-stoichiometric exsolution method to synthesize Mn2O3/SmMn2O5 catalyst.
- Near-ambient pressure X-ray photoelectron and absorption spectroscopies to analyze catalyst structure and electronic properties.
Main Results:
- The interface between exsolved Mn2O3 and mullite enhances Mn-O bond covalency and Mn3+ site electron density.
- Activated lattice oxygen facilitates reversible changes in Mn valence states and Mn-O bond covalency.
- The Mn2O3/SmMn2O5 catalyst demonstrates higher NO oxidation activity and improved hydrothermal stability.
Conclusions:
- The Mn2O3/SmMn2O5 catalyst effectively utilizes lattice oxygen for NO oxidation via a Mars-van Krevelen mechanism.
- This catalyst offers a promising alternative to commercial platinum-based catalysts for diesel oxidation applications.
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