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Epitaxial Oxide Interfaces Create Poison-Resistant CuO Sites for Environmental Catalysis
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DOI：10.1002/anie.7111765.png)
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Abstract
En 中文
Real exhaust streams rarely contain a single pollutant: NOx coexists with volatile organic compounds (VOCs) in flue gas from petrochemical production, chemical manufacturing, and waste incineration, yet catalysts that couple NH3-SCR with VOC oxidation typically suffer competitive adsorption, sulfur poisoning, and HCN byproduct formation. Here we engineer an epitaxially stabilized CuO overlayer on Ti1-xInxO2 that breaks the activity–selectivity–stability constraint by creating electron-poor, high-symmetry Cu–O sites and activating lattice-oxygen redox at the oxide–oxide interface. Interfacial strain and charge transfer increase Cu–O covalency and Lewis acidity, accelerating NOx reduction via an Eley–Rideal pathway while diverting sulfate deposition away from Cu. Concurrently, interface-activated lattice oxygen sustains deep oxidation of CH3SH (a representative S-VOC) through a Mars–van Krevelen cycle, suppressing HCN. Epitaxial interfaces thus offer a general route to poison-resistant multipollutant catalysis.
Keywords:
competitive adsorption
environmental catalysis
lattice oxygen
Lewis acid sites
oxide–oxide interface
SO2 resistance
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