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14.11.2023 | Original Article

A novel Ce_0.485Zr_0.485Y_0.03O₂ composite oxide with surface doping of Y and its application in Pd-only three-way catalyst

verfasst von: Zheng Zhao, Wei-Xin Zhao, Yong-Qi Zhang, Mei-Sheng Cui, Yong-Ke Hou, Dong-Ming Chen, Juan-Yu Yang, Zong-Yu Feng, Xiao-Wei Huang

Erschienen in: Rare Metals | Ausgabe 2/2024

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Abstract

The ceria-zirconia compound oxide-supported noble metal Pd (Pd@CZ) is widely used in three-way catalyst. Moreover, the surface structure of CZ plays an important role in catalytic activity of Pd. However, how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a challenge. In this paper, a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in CZ. The precipitate-deposition method is developed to prepare the novel Ce_0.485Z_r0.485Y_0.03O₂ composite with surface doping of Y (CZ-Y-S). In addition, the Pd@CZ-Y-S (Pd supported on CZ-Y-S) exhibits superior catalytic activity for HC, CO, and NO oxide, wherein, for CO and C₃H₆ oxidation, the low-temperature activity of Pd@CZ-Y-S is still 20% higher than that of Pd@CZ-Y-B (Y bulk doping) and commercial Pd@CZ after 1000 °C/4 h aging. The effect mechanism is further studied by density functional theory (DFT) calculation. Compared with Pd@CZ-Y-B, Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of O₂. The Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.

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Titel: A novel Ce0.485Zr0.485Y0.03O2 composite oxide with surface doping of Y and its application in Pd-only three-way catalyst
verfasst von: Zheng Zhao
Wei-Xin Zhao
Yong-Qi Zhang
Mei-Sheng Cui
Yong-Ke Hou
Dong-Ming Chen
Juan-Yu Yang
Zong-Yu Feng
Xiao-Wei Huang
Publikationsdatum: 14.11.2023
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 2/2024
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-023-02495-7

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