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- Title
Oscillatory CO Oxidation Over Pt/AlO Catalysts Studied by In situ XAS and DRIFTS.
- Authors
Boubnov, Alexey; Gänzler, Andreas; Conrad, Sabrina; Casapu, Maria; Grunwaldt, Jan-Dierk
- Abstract
Fresh and mildly aged Pt/AlO model diesel oxidation catalysts with small and large noble metal particle size have been studied during CO oxidation under lean burn reaction conditions to gain more insight into the structure and oscillatory reaction behaviour. The catalytic performance, CO adsorption characteristics using in situ DRIFTS and oxidation state using in situ XAS were correlated. Stable and pronounced oscillations only occurred over the catalyst with smaller particle sizes. Characteristic for this catalyst are low-coordinated surface Pt sites (more corner and edge atoms) which seem to become oxidized at elevated temperature as evidenced by in situ DRIFTS and in situ XAS. In situ XAS further uncovered that the oxidation of the Pt surface starts from the end of the catalyst bed and the oxidation state oscillates like the catalytic activity.
- Subjects
ALUMINUM oxide; PLATINUM catalysts; CHEMICAL structure; CARBON oxides; CHEMICAL stability; CATALYTIC activity; SURFACE chemistry
- Publication
Topics in Catalysis, 2013, Vol 56, Issue 1-8, p333
- ISSN
1022-5528
- Publication type
Article
- DOI
10.1007/s11244-013-9976-6