Monolithic Au/CeO2 nanorod framework catalyst prepared by dealloying for low-temperature CO oxidation

Xiaolong Zhang; Dong Duan; Guijing Li; Wenjie Feng; Sen Yang; Zhanbo Sun

doi:10.1088/1361-6528/aaa726

Monolithic Au/CeO₂ nanorod framework catalyst prepared by dealloying for low-temperature CO oxidation

Nanotechnology. 2018 Mar 2;29(9):095606. doi: 10.1088/1361-6528/aaa726.

Authors

Xiaolong Zhang¹, Dong Duan, Guijing Li, Wenjie Feng, Sen Yang, Zhanbo Sun

Affiliation

¹ School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, People's Republic of China.

PMID: 29328056
DOI: 10.1088/1361-6528/aaa726

Abstract

Monolithic Au/CeO₂ nanorod frameworks (NFs) with porous structure were prepared by dealloying melt-spun Al_89.7Ce₁₀Au_0.3 ribbons. After calcination in O₂, a 3D Au/CeO₂ NF catalyst with large surface area was obtained and used for low-temperature CO oxidation. The small Au clusters/nanoparticles (NPs) were in situ supported and highly dispersed on the nanorod surface, creating many nanoscale contact interfaces. XPS results demonstrated that high-concentration oxygen vacancy and Au ^δ+/Au⁰ co-existed in the calcined sample. The Au/CeO₂ nanorod catalyst calcined at 400 °C exhibited much higher catalytic activity for CO oxidation compared with the dealloyed sample and bare CeO₂ nanorods. Moreover, its complete reaction temperature was as low as 91 °C. The designed Au/CeO₂ NF catalyst not only possessed extreme sintering resistance but also exhibited high performance owing to the enhanced interaction between the Au clusters/NPs and CeO₂ nanorod during calcination.