CO adsorption on a Pt(111) surface partially covered with FeO x nanostructures

In Situ Observation of Competitive CO and O2 Adsorption on the Pt(111) Surface Using Near-Ambient Pressure Scanning Tunneling Microscopy

“…With increasing CO coverage, two structures coexist when additional adsorbed weakly bound CO molecules (i.e., when the CO coverage is greater than 0.50 ML) prefer to adsorb on the bridge sites of the Pt(111) surface. 19 When the CO/Pt(111) structure is almost fully covered (θ CO = 0.68 ML), the closely packed CO molecules occupy both atop and bridge sites of the Pt(111) surface (Figure 1c). Peculiar incommensurate and commensurate periodic structures are also reported on CO/ Pt(111) at θ CO = 0.5−0.68 ML, 17,19 which clearly describes a relationship between the binding sites and coverage of CO molecules on the Pt(111) surface.…”

“…19 When the CO/Pt(111) structure is almost fully covered (θ CO = 0.68 ML), the closely packed CO molecules occupy both atop and bridge sites of the Pt(111) surface (Figure 1c). Peculiar incommensurate and commensurate periodic structures are also reported on CO/ Pt(111) at θ CO = 0.5−0.68 ML, 17,19 which clearly describes a relationship between the binding sites and coverage of CO molecules on the Pt(111) surface.…”

“…Thus, the adsorption of CO on the Pt surface is a thermodynamically favorable reaction pathway with a strong binding energy. 15,45 Using high-resolution STM images, the characteristic coverage-dependent structures of the adsorbed CO were revealed at liquid helium 18,19 and room temperatures; 16,17 the adsorbed CO has binding energies of −2.0 to −1.4 eV, depending on the specific site (i.e., either atop or bridge) on the clean Pt(111) surface. 46−48 In other words, when considering CO−CO repulsive interactions, CO molecules prefer to occupy either the atop sites corresponding to the (√3 × √3)R30°-CO structure or bridge sites corresponding to the c(4 × 2)-CO structure.…”

Graphene Blocks Oxidative Segregation of Iron Dissolved in Platinum: A Model Study

“…A similar arrangement of diffraction spots was observed by various authors for low (<0.4 ML) coverages of CO adsorbed on Pt(111). [37,38] CO preferentially occupies on-top sites of Pt(111), forming mutually rotated domains separated by additional molecules at the bridge sites [39] (as shown on the schematic model in Figure 6g). The presence of these "√3" CO domains gives rise to a characteristic diffraction pattern with groups of three spots.…”

Role of Interfaces in the Thermal Reduction Process of the FeO/Cu2O/Cu(100) Surface

“…Iron oxide has been extensively studied due to its unique catalytic performance in many important industrial and environmental applications, such as Fischer–Tropsch synthesis (FTS), − water–gas shift (WGS) reaction, − and CO oxidation. − Among them, the industrial WGS reaction plays an essential role in increasing the production of hydrogen for refinery processes and redistribution. Iron oxide is the catalyst of choice for the high-temperature (310 °C–450 °C) WGS reaction, where copper is added as a promoter. − The active sites are considered as the interface between the Cu and Fe 1– x O overlayer which forms from CuO/Fe 2 O 3 during the WGS reaction due to strong metal–support interaction (SMSI) .…”