A TPD and IR study of co-adsorption of NO and oxygen on Ru(001)

Catalysis with Supported Size-selected Pt Clusters

“…With increasing temperature the features start to vanish at 330 K and disappear completely above 360 K. At even higher temperatures the spectra resemble the Pt(111) bulk spectrum. The temperature below which the CO molecule is bonded stably to the surface can be assigned to 340-350 K. Above that temperature a the MO of CO disappears, well in agreement with the TPD data above (peak maxima at ∼ 350 K for 0.3 CO /SA) and also different data in the literature [77,322,320].…”

“…An additional small peak present in all spectra at 110 K is originating from CO desorbing from the tungsten heating wires. Both the spectral shape and the peak positions as a function of coverage, correspond to data from the literature [79,319,247,320] (considering different heating rates and adsorption temperatures). The integration of the peak areas from the TPD spectra (not shown), reveal an linear increase in area with respect to the presented coverage range 6 , a saturation coverage is not reached.…”

A HREEL investigation of adsorption and dissociation of NO on a Rh(110) surface

“…This difference is due to the fact that when NO is adsorbing on a modified surface it occupies preferentially sites that are least affected by the preadsorbed 0 and N. Consequently, at low NO coverages, effects such as weak next-nearest neighbour interactions [451 and an increase of the local NO surface density mainly contribute to the observed relatively small blue shift. Similar weak effects on the NO bridging configuration at low NO and 0 coverages were reported for other systems [13,17,19,44,45]. The picture is quite different when the NO molecules remain on the surface as an undissociated fraction.…”

Structural analysis of Pt(1 1 1)c(√3 × 5)rect.–CO using photoelectron diffraction

“…[3]). Both EELS [4,5,6,7] and RAIRS [8,9,10] measurements for CO on Pt(111) showed that for coverages up to the nominal 0.33 ML of the ordered (√3√3)R30° phase the spectra indicate pure atop site adsorption, whereas at higher coverages a mixture of atop and bridge sites are occupied. The fact that these vibrational data indicate only occupation of (approximately) high-symmetry sites led to a revised picture of the compression phases as all being locally commensurate with the intermediate average mesh sizes inferred from the LEED patterns being due to moving inter-domain boundary walls [11,12,13].…”