Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5425043 | Surface Science | 2007 | 6 Pages |
The interaction between NO and CH3OH on the surface of stepped Pt(3Â 3Â 2) was investigated using Fourier transform infra red reflection-absorption spectroscopy (FTIR-RAS) and thermal desorption spectroscopy (TDS). At 90Â K, pre-dosed CH3OH molecules preferentially adsorb on step sites, suppressing the adsorption of NO molecules on the same sites. However, due to a much stronger interaction with Pt, at 150Â K and higher, the adsorption of NO molecules on step sites is restored, giving rise to peaks closely resembling those of NO molecules adsorbed on clean Pt(3Â 3Â 2) surface. Adsorbed CH3OH is very reactive on this surface, and is readily oxidized to formate in the presence of O2, even at 150Â K. In contrast, reactions between CH3OH and co-adsorbed NO are slight to non-existent. There are no new peaks in association with intermediates resulting from CH3OH-NO interactions. It is concluded that the reduction of NO with CH3OH on Pt(3Â 3Â 2) does not proceed through a mechanism of forming intermediates.