An XPS study of nitric oxide, carbon monoxide and oxygen adsorption on Pt(210)

Lang, J.F.; Masel, Richard I.

doi:10.1016/0039-6028(86)90703-x

Cited by 36 publications

(6 citation statements)

References 20 publications

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“…Pt(3 3 5) [8], Pt(3 3 2) [11], Pt(210) [12], and Pt(3 2 1) [13], no ordered CO surface structures were observed. Only for Pt(1 1 2), a surface with (1 1 1) terraces and (1 0 0) steps, coveragedependent ordered adsorbate structures have been observed by LEED [14].…”

Section: Introductionmentioning

confidence: 99%

The dissimilar twins – a comparative, site-selective in situ study of CO adsorption and desorption on Pt(322) and Pt(355)

et al. 2007

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Section: Introductionmentioning

confidence: 99%

The dissimilar twins – a comparative, site-selective in situ study of CO adsorption and desorption on Pt(322) and Pt(355)

et al. 2007

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“…There is general agreement that CO adsorbed on step sites is more strongly bound than on terraces, as shown by temperature programmed desorption (TPD) and temperature programmed x-ray photoelectron spectroscopy (TPXPS) studies [4][5][6][7][8]; also there is no indication for CO dissociation under the particular experimental conditions. Other important aspects, which were investigated, are the distribution of CO on different adsorption sites at both terraces and steps [9][10][11][12] and the possible formation of ordered adsorbate structures [9,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Site blocking and CO/sulfur site exchange processes on stepped Pt surfaces

Streber

Papp

Lorenz

et al. 2009

J. Phys.: Condens. Matter

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The influence of preadsorbed sulfur on the adsorption of CO on Pt(355) and Pt(322) is investigated systematically for sulfur precoverages between 0.02 and 0.30 ML by in situ x-ray photoelectron spectroscopy of the C 1s and S 2p core levels. The two surfaces have the same nominal terrace width of 5 atomic rows, but different step orientation. For both, at low temperatures (130 and 150 K), S preferentially adsorbs at the steps and passivates them for CO adsorption. The required S precoverage is significantly smaller for Pt(322), because of the lower number of steps as a result of the S-induced double-step formation. Upon heating, population of step sites with CO occurs due to irreversible CO/S site exchange. At low S precoverages, the characteristic transition temperatures of 165 K for Pt(355) and 245 K for Pt(322) are significantly different, indicating a higher activation barrier for the CO/S site exchange process for Pt(322). For medium to high S precoverages the transition temperature stays unchanged for Pt(322) but increases for Pt(355). The observed behavior is attributed to a kinetic passivation of the steps by sulfur at low temperatures, which is lifted upon heating.

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“…As such, the adsorption and dissociation of NO have attracted great attention. In the earlier 1980s, Masel et al studied a series of platinum stepped surfaces for NO dissociation and found that this reaction was strongly dependent on the surface structure. − The {111} surface was found to be essentially inactive. The {410} surface, on the other hand, was shown to have significantly higher reactivity for NO decomposition.…”

Section: Introductionmentioning

confidence: 99%

Structure Dependence of NO Adsorption and Dissociation on Platinum Surfaces

Neurock

2004

J. Am. Chem. Soc.

118

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The influence of surface structure on NO chemisorption and dissociation on Pt[100]-(1x1), Pt[211], and Pt[410] has been studied using density functional theory slab calculations with the generalized gradient corrections. The presence of steps on Pt[211] strengthens the NO-surface chemisorption bond, but the barrier for NO dissociation remains high. On the other hand, the steps on Pt[410] help to stabilize the N and O adatoms that form upon dissociation and the transition state. The calculated barrier of 80.2 kJ/mol on Pt[410] is in good agreement with experiment. These results show that both the presence of steps and the nature of the steps are important to activate NO. An ensemble of square-arranged Pt atoms has been identified as an important feature in activating the N-O bond.

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An XPS study of nitric oxide, carbon monoxide and oxygen adsorption on Pt(210)

Cited by 36 publications

References 20 publications

The dissimilar twins – a comparative, site-selective in situ study of CO adsorption and desorption on Pt(322) and Pt(355)

The dissimilar twins – a comparative, site-selective in situ study of CO adsorption and desorption on Pt(322) and Pt(355)

Site blocking and CO/sulfur site exchange processes on stepped Pt surfaces

Structure Dependence of NO Adsorption and Dissociation on Platinum Surfaces

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