1. Revealing the intrinsic nature of Ni-, Mn-, and Y-doped CeO2 catalysts with positive, additive, and negative effects on CO oxidation using operando DRIFTS-MS.
- Author
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Shiyu Fang, Yan Sun, Jiacheng Xu, Tiantian Zhang, Zuliang Wu, Jing Li, Erhao Gao, Wei Wang, Jiali Zhu, Lianxin Dai, Weihua Liu, Buhe Zhang, Junwei Zhang, and Shuiliang Yao
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TRANSITION metal oxides , *CATALYSTS , *CATALYTIC activity , *TRANSITION metals , *FACTOR analysis , *FACTOR structure - Abstract
The catalytic activity of a transition metal (host) oxide can be influenced by doping with a second cation (dopant), but the key factors dominating the activity of the doped catalyst are still controversial. Herein, CeO2 doped with Ni, Mn, and Y catalysts prepared using aerosol pyrolysis were used to demonstrate the positive, negative, and additive effects on CO oxidation as a model reaction. Various characterization results indicated that Ni, Mn, and Y had been successfully doped into the CeO2 lattice. The catalytic activities of each catalyst for CO conversion were in the order of Ni–CeO2 > Mn–CeO2 > CeO2 > Y–CeO2. Operando DRIFTS-MS and various characterization methods were applied to reveal the intrinsic nature of the doping effects. The accumulation rate of the surface bidentate carbonates determined the CO oxidation. A definition to evaluate the doping effect was proposed, which is anticipated to be useful for developing a rational catalyst with a high CO oxidation activity. The CO oxidation reactivities displayed strong correlations with the surface factors obtained from operando DRIFTS-MS analysis and the structure factors from XPS and Raman analyses. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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