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

• Type: Article in International Scientific Journal
• Date: 2014

Authors

V. P. Santos (Author) Other; S. A. C. Carabineiro (Author) FEUP; J. J. W. Bakker (Author) Other; O. S. G. P. Soares (Author) FEUP; X. Chen (Author) Other; M. F. R. Pereira (Author) FEUP; J. J. M. Orfão (Author) FEUP; J. L. Figueiredo (Author) FEUP; J. Gascon (Author) Other; F. Kapteijn (Author) Other

Journal

Title: Journal of Catalysis

Vol. 309

Pages: 58-65

ISSN: 0021-9517

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 45 Citations

ISI Web of Science

Scopus - 65 Citations

Pubmed / Medline

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Engineering and technology > Chemical engineering

Associated Projects

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

Other information

Authenticus ID: P-008-EPR

DOI: 10.1016/j.jcat.2013.08.030

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8