Citation: Wen Shi, Tongtong Gao, Liyun Zhang, Yanshuang Ma, Zhongwen Liu, Bingsen Zhang. Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation[J]. Chinese Journal of Catalysis, ;2019, 40(12): 1884-1894. doi: S1872-2067(19)63374-7 shu

Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation

a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China;
b Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry &Chemical Engineering, Shaanxi Normal University, Xi'an 710119, Shaanxi, China;
c School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China

Received Date: 2 March 2019
Revised Date: 6 April 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21773269, 21761132025, 91545119, 21703262), the Youth Innovation Promotion Association CAS (2015152), and the Joint Foundation of Liaoning Province Natural Science Foundation and Shenyang National Laboratory for Materials Science (20180510047).

Iron oxide supported Au nanomaterials are one of the most studied catalysts for low-temperature CO oxidation. Catalytic performance not only critically depends on the size of the supported Au nanoparticles (NPs) but also strongly on the chemical nature of the iron oxide. In this study, Au NPs supported on iron oxide nanorods with different surface properties through β-FeOOH annealing, at varying temperatures, were synthesized, and applied in the CO oxidation. Detailed characterizations of the interactions between Au NPs and iron oxides were obtained by X-ray diffraction, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy. The results indicate that the surface hydroxyl group on the Au/FeOOH catalyst, before calcination (Au/FeOOH-fresh), could facilitate the oxygen adsorption and dissociation on positively charged Au, thereby contributing to the low-temperature CO oxidation reactivity. After calcination at 200℃, under air exposure, the chemical state of the supported Au NP on varied iron oxides partly changed from metal cation to Au⁰, along with the disappearance of the surface OH species. Au/FeOOH with the highest Au⁰ content exhibits the highest activity in CO oxidation, among the as-synthesized catalysts. Furthermore, good durability in CO oxidation was achieved over the Au/FeOOH catalyst for 12 h without observable deactivation. In addition, the advanced identical-location TEM method was applied to the gas phase reaction to probe the structure evolution of the Au/iron oxide series of the catalysts and support structure. A Au NP size-dependent Ostwald ripening process mediated by the transport of Au(CO)_x mobile species under certain reaction conditions is proposed, which offers a new insight into the validity of the structure-performance relationship.
- Iron oxide nanorods,
- Surface property,
- Au nanoparticle,
- CO oxidation,
- Structure evolution
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