Deposition of platinum nanoparticles, synthesized in water-in-oil microemulsions, on alumina supports
Artikel i vetenskaplig tidskrift, 2002

Platinum nanoparticles were prepared in water-in-oil microemulsions and deposited on gamma-alumina using two different methods. In the first method, the alumina support was added to the particle suspension and the microemulsion was subsequently destabilized by addition of tetrahydrofurane, whereby the particles were deposited on the alumina support. In the other method, the platinum nanoparticles were transferred to an aqueous solution were they were redispersed by a stabilizing surfactant prior to addition of the alumina support. The size of the microemulsion droplets and of the unsupported platinum particles was in the range of a few nanometers as measured by a dynamic light scattering technique (photon correlation spectroscopy). The size of the unsupported platinum nanoparticles and of the particles deposited on alumina was studied by transmission electron microscopy. Both methods for platinum particle deposition resulted in some degree of particle agglomeration, the first probably because of too-fast destabilization of the microemulsion and the second due to inefficient redispersion of the Pt particles when transferred to the aqueous phase. All samples investigated showed high catalytic activity for CO oxidation by oxygen. The highest activity was found for those samples prepared via the redispersion method where a relatively weak interaction was achieved between the redispersed Pt particles and the alumina.

CO

CATALYSTS

OXIDATION

SIZE

REVERSE MICELLES

COLLOIDAL METAL PARTICLES

Författare

Hanna Härelind Ingelsten

Institutionen för teknisk ytkemi

Kompetenscentrum katalys (KCK)

Jean-Christophe Béziat

Kompetenscentrum katalys (KCK)

Kristina Bergkvist

Kompetenscentrum katalys (KCK)

Institutionen för teknisk ytkemi

Anders Palmqvist

Institutionen för teknisk ytkemi

Kompetenscentrum katalys (KCK)

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Institutionen för teknisk ytkemi

Hu Qiuhong

Chalmers, Teknisk fysik

Lena Falk

Chalmers, Institutionen för experimentell fysik, Mikroskopi och mikroanalys

Krister Holmberg

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för material- och ytkemi, Teknisk ytkemi

Langmuir

0743-7463 (ISSN) 1520-5827 (eISSN)

Vol. 18 5 1811-1818

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Energi

Materialvetenskap

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Kemiteknik

DOI

10.1021/la0110949

Mer information

Senast uppdaterat

2018-11-05