@article{Cheng2025, 
author = {Xingwang Cheng and Yi Tu and Dongling Zhang and Dong Han and Luchao Huang and Jun Hu and Honghe Ding and Qian Xu and Junfa Zhu},
title = {CO adsorption, activation, and oxidation on CeO2(111)-supported Fe model catalyst surfaces},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {2},
pages = {94907093},
keywords = {adsorption, oxidation, model catalyst, activation, iron/ceria},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907093},
doi = {10.26599/NR.2025.94907093},
abstract = {Elucidating the synergistic effect of Fe on CeO2 is challenging in CO-related reactions but attractive owing to the improvement in the oxygen storage/release capacity of ceria with the addition of Fe. Here, using CeO2(111)-supported Fe model catalysts, CO adsorption, activation, and oxidation on catalyst surfaces was carefully investigated using synchrotron radiation photoemission spectroscopy (SRPES), temperature-programmed desorption (TPD), and infrared reflection absorption spectroscopy (IRRAS). The precursor π-bonding state for CO dissociative adsorption has been identified through unusually low CO vibration frequencies and a low dissociation temperature on Fe/CeO2(111) surfaces. CO is oxidized by dissociated atomic O followed by the Langmuir–Hinshelwood mechanism, whereas the lattice oxygen of CeO2 exhibits low activity. The CO2 yield displays a volcanic curve as a function of Fe coverage. On the 0.6 ML Fe/CeO2 surface, weakly bound atomic O on Fe2+ results in the best catalytic activity. While on high Fe coverage surfaces, the CO2 yield is limited due to the capture of atomic O by Fe0. Our results provide comprehensive insights into the adsorption, activation, and oxidation of CO on Fe/CeO2 and identify the reaction mechanism, and the active site, which provides deeper insights into CO-related reaction mechanisms over CeO2-supported Fe catalysts.}
}