2014 AIChE Annual Meeting

November 16th - November 21th, 2014

Hilton Atlanta

Atlanta, GA Program Topic: 03D04 Nanostructured Particles for Catalysis

Title: Chemical vapour impregnation- a versatile route to high redox activity nanoparticle catalysts
Presenting Author: Michael M Forde§,¥ Email: michael.forde@sta.uwi.edu

Co-Authors:

Graham J Hutchings§ email: Hutch@cardiff.ac.uk Christopher J Kiely* Email: chk5@Lehigh.edu Qian He* Email: heqian.lehigh@gmail.com
Ren Suâ?  Email: rensu@inano.au.dk
Lokesh Kesavan§ ,� Email: lokesh.kesavan@aalto.fi
Nikoloas Dimitratos§ Email: DimitratosN@cardiff.ac.uk

§ Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff, CF103AT , United Kingdom. Tel.: +442920874059

Â¥ Department of Chemistry, University of the West Indies, St. Augustine Campus, Trinidad and

Tobago. Tel: +18686622002 ext83544

* Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015-3195, USA.

â?  Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark.

§,� School of Chemical Technology, Aalto University, Kemistintie 1, Espoo FI-02150, Finland.

Abstract

The controlled preparation of supported nanoparticles for catalysis can be achieved by many techniques such as sol-immobilisation, atom layer deposition, electrostatic precipitation deposition amongst others. Many routes to highly dispersed metal nanoparticles suffer from surface contamination, lengthy preparation processes and particle growth in post treatment procedures. Chemical vapour methods have seldom been employed for preparing supported nanoparticles, though these are extensively used in materials synthesis for a variety of non- catalysis applications. We will present a simple procedure to prepare nanoparticles of a variety of metals on oxide supports that can be performed in any standard laboratory using non-specialised equipment. The deposited metal nanoparticles have high dispersion and the surfaces of the materials are contamination free. Sub-nm particles can also be prepared using the techniques and these species are stable even under the high temperature treatment employed in the final preparation steps. The paper will highlight the use of the technique to modify a pre-formed catalyst with a second metal using the example of Pdshell-Aucore hybrid material and the preparation of controlled bimetallic nanoparticles using Pd-Pt as an example. Our materials are very active in a variety of oxidation and hydrogenation reactions and photocatalysis and show enhanced performance as compared to analogues prepared by more traditional routes.