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Construction of CuO/CeO2 Catalysts via the Ceria Shape Effect for Selective Catalytic Oxidation of Ammonia
Abstract
Tuning the interaction between the loaded metal oxide and the support material is an efficient strategy to boost catalytic purification of ammonia (NH 3 ) as an important factor in the formation of haze. Herein, CuO/CeO 2 catalysts based on the ceria shape effect (Ce-NR and Ce-NC) are prepared and tested for the selective catalytic oxidation of ammonia (NH 3 -SCO). The interaction between CuO and CeO 2 with different shapes is crucial to regulate the interface structure and the content of oxygen vacancies. The Cu/Ce-NR possesses more Cu + -O v -Ce 3+ interfacial sites and more oxygen vacancies and achieves a higher catalytic activity ( T 100 = 240 °C) and a lower apparent activation energy (37.18 kJ mol –1 ) for NH 3 -SCO compared with Cu/Ce-NC ( T 100 = 270 °C, 86.57 kJ mol –1 ). In situ diffuse reflectance infrared Fourier transform spectra and density functional theory calculation results prove that the Cu + -O v -Ce 3+ interfacial site is the main adsorption site for NH 3 . The further reaction of in situ generated nitrate with NH 3 is the rate-determining step over the CuO/CeO 2 catalysts, and it is revealed that NH 3 much more easily reacts with the monodentate nitrate species formed on the Cu/Ce-NR catalyst than the bidentate nitrate formed on the Cu/Ce-NC catalyst at 240 °C. This study enriches the understanding of designing efficient catalysts by support shape to modulate their interfacial structure and thus improve the activity of NH 3 -SCO.
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Metadata
- Authors
- Sun, H., Wang, H., & Qu, Z.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2023-01-02
- Volume
- 13
- Issue
- 2
- Pages
- 1077-1088
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W4313478070
- Cited by
- 298
- References
- 35
- FWCI
- 20.97
- Type
- journal article
- Language
- en
- Open access
- closed
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