Issue 15, 2003
From the journal:

Physical Chemistry Chemical Physics

Propene combustion over a model Pt/Al2O3/NiAl{110} catalyst

David E. Gawthrope,a   Karen Wilsonb  and  Adam F. Lee*a  

* Corresponding authors

a Department of Chemistry, University of Hull, Hull, UK
E-mail: a.f.lee@.hull.ac.uk
Fax: +44 1482 466410
Tel: +44 1482 465220

b Department of Chemistry, University of York, York, UK
E-mail: kw13@york.ac.uk
Fax: +44 1904 432516
Tel: +44 1904 432586

Abstract

The genesis of a catalytically active model Pt/Al2O3/NiAl{110} oxidation catalyst is described. An ultrathin, crystalline γ-Al2O3 film was prepared via direct oxidation of a NiAl{110} single-crystal substrate. The room-temperature deposition of Pt clusters over the γ-Al2O3 film was characterised by LEED, AES and CO titration and follows a Stranski–Krastanov growth mode. Surface sulfation was attempted via SO2/O2 adsorption and thermal processing over bare and Pt promoted Al2O3/NiAl{110}. Platinum greatly enhances the saturation SOx coverage over that of bare alumina. Over clean Pt/γ-Al2O3 surfaces some adsorbed propene desorbs molecularly ∼250 K while the remainder decomposes liberating hydrogen. Coadsorbed oxygen or sulfate promote propene combustion, with adsorbed sulfoxy species the most efficient oxidant. The chemistry of these alumina-supported Pt clusters shows a general evolution from small polycrystalline clusters to larger clusters with properties akin to low-index, Pt single-crystal surfaces.

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Article information

DOI
https://doi.org/10.1039/B304232D
Article type
Paper
Submitted
17 Apr 2003
Accepted
02 Jun 2003
First published
23 Jun 2003

Phys. Chem. Chem. Phys., 2003,5, 3299-3305

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Propene combustion over a model Pt/Al2O3/NiAl{110} catalyst

D. E. Gawthrope, K. Wilson and A. F. Lee, Phys. Chem. Chem. Phys., 2003, 5, 3299 DOI: 10.1039/B304232D

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