Monolithic Au/CeO₂ nanorod framework catalyst prepared by dealloying for lowerature CO oxidation

Monolithic AuCeO₂ 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 lowerature 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 AuCeO₂ 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.