| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 41266 | Applied Catalysis A: General | 2012 | 4 Pages |
PROX reaction was studied over an unsupported PtSn catalyst. CO2 and H2O were produced from a H2 flow containing 1% CO, and 0.4–2% O2. PtSn pretreated with O2 and H2 contained more Pt in the near-surface region and was more active towards CO oxidation than a sample pretreated in H2 only. In situ XPS was also carried out during PROX reaction. Sn 3d indicated the presence of Sn-oxides, near to the surface region, along with Pt3Sn. Pt 4f peak showed metallic Pt under all conditions. Water and OH enrichment was observed in the O 1s spectrum, taken during PROX reaction.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (229 K)Download as PowerPoint slideHighlights► Unsupported PtSn was more active catalyst in PROX than Pt black. ► Pretreatment by H2 and by O2–H2 increased activity. ► PROX activity had a sharp maximum at about 400 K. ► In situ XPS: Pt 4f showed Pt0, Sn 3d contained Sn0 and Sn oxides. ► Whenever surface OH, H2O are present, PROX reaction is more rapid.
