The structure–activity relationships of Rh/CeO_(2)-ZrO_(2) catalysts based on Rh metal size effect in the three-way catalytic reactions  

作　　者：Dongming Chen Weixin Zhao Zihao Xu Zheng Zhao Juanyu Yang Yongke Hou Yongqi Zhang Zongyu Feng Meisheng Cui Xiaowei Huang 

机构地区：[1]National Engineering Research Center for Rare Earth,Grirem Advanced Materials Co.,Ltd.,Beijing 100088,China [2]Grirem Hi-Tech Co.,Ltd.,Sanhe 065201,China [3]General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Nano Research》2024年第8期6870-6878,共9页纳米研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3504202);the National Natural Science Foundation of China(No.52204376);Youth Foundation of Hebei Province(No.E2022103007).

摘　　要：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/CeO_(2)–ZrO_(2) 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+O_(2),NO+CO,and hydrocarbons(HCs)+O_(2) and operando infrared spectroscopy,we found that metallic Rh sites on Rh nanoparticles are the key factor responsible for the low-temperature catalytic performance.

关 键 词：Rh/CeO_(2)-ZrO_(2) catalyst Rh metal size effect Rh nanoparticles three-way catalytic performance 

分 类 号：O64[理学—物理化学]