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- Title
The structure–activity relationships of Rh/CeO<sub>2</sub>–ZrO<sub>2</sub> catalysts based on Rh metal size effect in the three-way catalytic reactions.
- Authors
Chen, Dongming; Zhao, Weixin; Xu, Zihao; Zhao, Zheng; Yang, Juanyu; Hou, Yongke; Zhang, Yongqi; Feng, Zongyu; Cui, Meisheng; Huang, Xiaowei
- Abstract
With the continuous tightening of automotive emission regulations and the increasing promotion of energy-efficient hybrid vehicles, new challenges have arisen for the low-temperature performance of three-way catalysts (TWCs). To guide the design of next-generation TWCs, it is essential to further develop our understanding of the relationships between microstructure and catalytic performance. Here, Rh/CeO2–ZrO2 catalysts were synthesized with different Rh metal dispersion by using a combination of the wet impregnation method and reduction treatment. These catalysts included Rh single-atom catalysts, cluster catalysts, and nanoparticle catalysts. The results showed that the Rh nanoparticle catalyst, with an average size of 1.9 nm, exhibited superior three-way catalytic performance compared to the other catalysts. Based on the catalytic activity in a series of simple reaction atmospheres such as CO + O2, NO + CO, and hydrocarbons (HCs) + O2 and operando infrared spectroscopy, we found that metallic Rh sites on Rh nanoparticles are the key factor responsible for the low-temperature catalytic performance.
- Publication
Nano Research, 2024, Vol 17, Issue 8, p6870
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-024-6643-0