Heterostructured catalysts prepared by dispersing Au@Fe2O 3 core-shell structures on supports and their performance in CO oxidation

Hongfeng Yin, Zhen Ma, Miaofang Chi, Sheng Dai

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Herein, we report novel gold catalysts made by dispersing Au@Fe 2O3 core-shell structures on solid supports. In the synthesis of Au@Fe2O3 core-shell structures, dodecanethiol-capped gold nanoparticles were used as the seed and Fe(CO) 5 was used as the precursor to Fe2O3 shell. The Au@Fe2O3 core-shell particles were deposited onto SiO2 support to obtain Au@Fe2O3/SiO2 catalysts that were highly active for low-temperature CO oxidation. The catalytic activity was even higher than that of Au/SiO2 or Au/Fe 2O3 prepared by colloidal deposition with comparable gold loadings. The influences of thermal pretreatment, shell thickness, and different supports (e.g., SiO2, TiO2, C, Fe2O 3) were investigated, and relevant characterization using TG/DTG, XRD, TEM, HAADF, and EDX was conducted.

Original languageEnglish
Pages (from-to)87-95
Number of pages9
JournalCatalysis Today
Volume160
Issue number1
DOIs
StatePublished - Feb 2 2011

Funding

Research sponsored by the Division of Chemical Sciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. This research was also supported by the appointment for H.F. Yin to the ORNL Research Associates Program, administered by Oak Ridge Associated Universities.

Keywords

  • Au@FeO
  • CO oxidation
  • Catalysis
  • Core-shell
  • FeO
  • Gold
  • Nanoparticles

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