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

David E. Gawthrope, Karen Wilson, Adam F. Lee

Research output: Contribution to journalArticlepeer-review

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 [similar]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.
Original languageEnglish
Pages (from-to)3299-3305
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume5
Issue number15
Early online date23 Jun 2003
DOIs
Publication statusPublished - Aug 2003

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