Stabilized gold on cerium-modified cryptomelane: Highly active in low-temperature CO oxidation

V. P. Santos*, S. A.C. Carabineiro, J. J.W. Bakker, O. S.G.P. Soares, Xiankai Chen, M. F.R. Pereira, J. J.M. Órfão, J. L. Figueiredo, Jorge Gascon Sabate, F. Kapteijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Cerium-doped cryptomelane stabilizes polyhedron Au nano-particles smaller than 3 nm. The obtained Au/Ce/cryptomelane catalyst is highly active for CO oxidation. Cationic, neutral, and anionic gold species were found on Ce/cryptomelane. The modification of cryptomelane by the addition of cerium is twofold: (i) cerium is incorporated in the tunnels of cryptomelane, increasing the number of defects which function as nucleation sites for gold and (ii) ceria nano-particles at the surface induce charge transfer between gold and cryptomelane. TOF for Au/Ce-K-OMS-2 is about twice that of Au/CeO2 prepared by the same procedure.

Original languageEnglish (US)
Pages (from-to)58-65
Number of pages8
JournalJournal of Catalysis
Volume309
DOIs
StatePublished - Jan 1 2014

Keywords

  • CO oxidation
  • Cerium doping
  • Cryptomelane
  • Gold catalysis
  • Oxygen vacancies

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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