Formation of Different Rh–O Species on Rh(110) and Their Reaction with CO
Formation of Different Rh–O Species on Rh(110) and Their Reaction with CO
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Rh(110)上不同Rh-O形态的形成及其与CO的反应
DOI:
10.1021/acscatal.2c04463
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发表时间:
2022-12
期刊:
影响因子:
12.9
通讯作者:
Zhi Liu
中科院分区:
文献类型:
--
作者:
Jun Cai;Yunjian Ling;Hui Zhang;Bo Yang;Fan Yang;Zhi Liu
CO oxidation on Rh has received considerable attention because of its importance in commercial three-way catalyst applications. Although many studies have been conducted on this process, detailed analysis of the formation of Rh–O species has not yet been carried out, particularly with respect to their activity for CO oxidation. In this work, we reported the in situ study of Rh–O species and their activity for CO oxidation over the Rh(110) surface using advanced surface science techniques, including ambient-pressure X-ray photoelectron spectroscopy, ambient-pressure mapping of resonant Auger electron spectroscopy, and ambient-pressure scanning tunneling microscopy. The Rh–O species, (2 × 1)–O, (10 × 2)–O, trilayer O–Rh–O, and Rh2O3, were demonstrated to be formed in sequence as the O2chemical potential increases. CO titration experiments demonstrated that the reactivity of the Rh–O species followed the sequence (2 × 1)–O > (10 × 2)–O > trilayer O–Rh–O ≫ Rh2O3. The titration reaction on the trilayer oxide was a two-step process, which started with an intrinsic reaction of O–Rh–O, followed by a relatively higher reaction rate. The change of reaction rate was a result of the restructuring from O–Rh–O to (10 × 2)–O. Our results provided the correlation of the surface Rh–O species and reactivity of the CO oxidation on Rh-based catalysts.
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