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Towards the Rational Design of Supported-Bimetallic Nanoparticle Catalysts

Published online by Cambridge University Press:  31 January 2011

Priyabrat Dash  and
Robert W. J. Scott
Priyabrat Dash
Affiliation:
prd822@mail.usask.ca, University of Saskatchewan, Chemistry, Saskatoon, Canada
Robert W. J. Scott
Affiliation:
robert.scott@usask.ca, University of Saskatchewan, Chemistry, Saskatoon, Canada
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Abstract

Heterogeneous catalysts consisting of nanoparticles dispersed on an oxide support are a mainstay in industrial reactions, and are often made via thermal reduction of metal salts dispersed onto a pre-synthesized support. Herein we document a route towards the design of xerogel-supported nanoparticle catalysts by trapping compositionally-tuned polymer-stabilized nanoparticle precursors into sol-gel matrices. Such a route allows in principle for the tuning of the size, composition, architecture, and electronic properties of nanoparticle catalysts, which allows for the development of highly efficient and selective catalysts. As proof of concept we detail the synthesis of co-reduced PdAu nanoparticles in titania supports. The final materials are well-characterized by HRTEM and energy dispersive spectroscopy (EDS), which confirm the compositional uniformity of the nanoparticles. The importance of controlling calcination conditions in order to retain designed nanoparticle compositions is stressed; high temperature calcination conditions lead to a large degree of sintering and loss of compositional uniformity, while mild calcination temperatures can be used to retain nanoparticle compositions and sizes.

Keywords

catalyticnanostructuretransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y01-07
Copyright
Copyright © Materials Research Society 2010

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