The Critical Role of Oxygen Vacancies in N<sub>2</sub>O Decomposition Over Cobalt-Doped CeO<sub>2</sub> Catalysts

Catalytic decomposition is a promising method for N<sub>2</sub>O removal, and the nature of active sites on the catalysts is under debate. The combination of experimental observations and density functional theory (DFT) calculations indicates that oxygen vacancies in the metal oxide catalysts serve as the active sites for N<sub>2</sub>O decomposition. Co doping in CeO<sub>2</sub> significantly increases the content of oxygen vacancies, thereby enhancing the activity of the catalyst for N<sub>2</sub>O decomposition. A catalyst with Co/Ce = 1 exhibited the best activity, with a <i>T</i><sub>90</sub> of 375 °C and excellent stability maintained for over 100 h, which is much better than that of Co<sub>3</sub>O<sub>4</sub> spinel. The finding advances the understanding of active sites in the N<sub>2</sub>O catalytic decomposition and contributes to the design of highly efficient catalysts.

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Publication Details

Journal
Environmental Science & Technology
Published
2025-03-04
DOI
https://doi.org/10.1021/acs.est.5c00180
Citations
38
Primary Topic
Catalytic Processes in Materials Science
Type
article
Field-Weighted Citation Impact
19.68

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article en
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Abstract

Catalytic decomposition is a promising method for N<sub>2</sub>O removal, and the nature of active sites on the catalysts is under debate. The combination of experimental observations and density functional theory (DFT) calculations indicates that oxygen vacancies in the metal oxide catalysts serve as the active sites for N<sub>2</sub>O decomposition. Co doping in CeO<sub>2</sub> significantly increases the content of oxygen vacancies, thereby enhancing the activity of the catalyst for N<sub>2</sub>O decomposition. A catalyst with Co/Ce = 1 exhibited the best activity, with a <i>T</i><sub>90</sub> of 375 °C and excellent stability maintained for over 100 h, which is much better than that of Co<sub>3</sub>O<sub>4</sub> spinel. The finding advances the understanding of active sites in the N<sub>2</sub>O catalytic decomposition and contributes to the design of highly efficient catalysts.

Environmental Science & TechnologyVol. 59(11)
Chinese Academy of Sciences (CN), Institute of Urban Environment (CN), State Key Joint Laboratory of Environment Simulation and Pollution Control (CN), Research Center for Eco-Environmental Sciences (CN), University of Chinese Academy of Sciences (CN)
National Natural Science Foundation of China, Youth Innovation Promotion Association of the Chinese Academy of Sciences, National Key Research and Development Program of China
Openalex Percentile: Top 0%
Catalytic Processes in Materials Science
19.68
DOISourceOpenAlex
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