Differences in catalytic properties between mesoporous and nanoparticulate platinum
Artikel i vetenskaplig tidskrift, 2007
Conventional Pt/Al2O3 catalysts prepared by wet-impregnation are composed of Pt nanoparticles exposing convex and facetted surfaces deposited on high-surface area gamma-Al2O3 supports. A hexagonal phase mesoporous Pt material (denoted H-1-Pt) prepared by chemical reduction in the aqueous domains of a lyotropic liquid crystalline template exposes however mainly a concave surface with expected different catalytic properties. A series of Pt/Al2O3 catalysts were prepared using H-1-Pt, Pt-black or wet-impregnated Pt, and the samples were characterized by SEM-EDX and TEM, and finally evaluated for CO oxidation. The H-1-Pt/Al2O3 catalyst showed an ignition profile for CO oxidation at lower temperatures and thus appeared less sensitive to CO poisoning than the two other types of samples. This difference may be related to the differences in surface curvature.
Författare
Ali Saramat
Kompetenscentrum katalys
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Martin Andersson
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Steve Hunt
University of Southampton
Peter Thormählen
Chalmers, Teknisk fysik, Kemisk fysik
Kompetenscentrum katalys
Magnus Skoglundh
Kompetenscentrum katalys
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
George Attard
University of Southampton
Anders Palmqvist
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Kompetenscentrum katalys
European Physical Journal D
14346060 (ISSN) 14346079 (eISSN)
Vol. 43 1-3 209-211Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier
Kemiteknik
Miljövetenskap
DOI
10.1140/epjd/e2007-00124-7