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

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; Shuiliang Yao

doi:10.1039/d3dt03001f

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

Dalton Trans. 2023 Nov 21;52(45):16911-16919. doi: 10.1039/d3dt03001f.

Authors

Shiyu Fang¹, Yan Sun¹, Jiacheng Xu^{1

2}, Tiantian Zhang¹, Zuliang Wu^{1

3}, Jing Li^{1

3}, Erhao Gao^{1

3}, Wei Wang^{1

3}, Jiali Zhu^{1

3}, Lianxin Dai⁴, Weihua Liu⁴, Buhe Zhang⁴, Junwei Zhang⁴, Shuiliang Yao^{1

2

3}

Affiliations

¹ School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China. yaos@cczu.edu.cn.
² School of Material Science and Engineering, Changzhou University, Changzhou 213164, China.
³ Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China.
⁴ Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an 343100, China.

PMID: 37927054
DOI: 10.1039/d3dt03001f

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.