An infrared emission study of the C=O stretch vibration of bridge-bonded CO on Pt(111)

Tobin, R. G.; Phelps, Robert Bloss; Richards, P. L.

doi:10.1016/s0039-6028(87)80219-4

Cited by 28 publications

(13 citation statements)

References 27 publications

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“…The band frequencies correspond to CO adsorption on completely reduced platinum sites, in agreement with the literature. [30][31][32][33][34][35][36][37][38][39] The change in the spectrum as a function of the temperature of treatment in flowing helium is illustrated in Figures 4-6. In agreement with literature data, 31,32,35 the bridging CO bands at about 1830 cm -1 are weak, constituting a small fraction of the CO band intensities; these were clearly evident only at high degrees of surface coverage.…”

Section: Interaction Of {Pt[mo(co) 3 (C 5 H 5 )] 2 (Phcn) 2 } With Mgomentioning

confidence: 99%

Synthesis and Characterization of Model MgO-Supported Catalysts with Pt−Mo Interactions

et al. 1996

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MgO-supported platinum and platinum-molybdenum catalysts were prepared from organometallic precursors and characterized structurally to determine how the nature of the bimetallic precursors and the treatment conditions affected the interaction between the two metals. Samples were prepared from [PtCl 2 (PhCN) 2 ], [PtCl 2 (PhCN) 2 ] + [Mo(CO) 6 ], and {Pt[Mo(CO) 3 (C 5 H 5 )] 2 (PhCN) 2 } and characterized by infrared and extended X-ray absorption fine structure (EXAFS) spectroscopies, transmission electron microscopy, and chemisorption of H 2 , CO, and O 2 . The samples were treated in H 2 at 400°C prior to most of the characterizations. Incorporation of Mo reduced the chemisorption of CO and of H 2 . EXAFS spectra measured at the Pt L III edge and at the Mo K edge showed substantial Pt-Mo contributions with a Pt-Mo coordination number of about 2 and an average distance of 2.63 Å for the sample prepared from {Pt[Mo(CO) 3 (C 5 H 5 )] 2 (PhCN) 2 }. In contrast, no significant Pt-Mo contribution was observed for the sample prepared from [PtCl 2 (PhCN) 2 ] + [Mo(CO) 6 ]. Electron micrographs and EXAFS results show that interaction between Pt and Mo ions in the former sample helped to maintain the platinum in a highly dispersed form, with supported platinum clusters being smaller than about 10 Å.

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Section: Interaction Of {Pt[mo(co) 3 (C 5 H 5 )] 2 (Phcn) 2 } With Mgomentioning

confidence: 99%

Synthesis and Characterization of Model MgO-Supported Catalysts with Pt−Mo Interactions

et al. 1996

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“…Moreover, as mentioned earlier, there is a feature at 1919 cm À1 that appears more evidently for the Pt/Au(554) sample (identified as CO* in Figure 2 c, d). [20]) suggest that this band belongs to CO adsorbed on a configuration different to top or even bridge, since these bands appear in the regions 2000-2050 and 1800-1860 cm À1 , respectively, [21] on Pt(111). [20]) suggest that this band belongs to CO adsorbed on a configuration different to top or even bridge, since these bands appear in the regions 2000-2050 and 1800-1860 cm À1 , respectively, [21] on Pt(111).…”

Section: Ethanol Oxidation On Pt/au(hkl) Surfacesmentioning

confidence: 99%

“…CO stripping electrochemical experiments followed by in situ FTIR spectroscopy (see ref. [20]) suggest that this band belongs to CO adsorbed on a configuration different to top or even bridge, since these bands appear in the regions 2000-2050 and 1800-1860 cm À1 , respectively, [21] on Pt(111). Many authors have reported a feature in the FTIR spectra of adsorbed CO on Pt(110) and Pt(100) single crystals in the range 1950-1870 cm À1 , which is attributed to CO adsorption at bridge or top sites.…”

Section: Ethanol Oxidation On Pt/au(hkl) Surfacesmentioning

confidence: 99%

Influence of Substrate Steps on the Catalytic Properties of Pt Layers: The Ethanol Electrooxidation Reaction

Prieto

Tremiliosi‐Filho

2014

ChemPhysChem

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The ethanol oxidation reaction (EOR) is investigated on Pt/Au(hkl) electrodes. The Au(hkl) single crystals used belong to the [n(111)x(110)] family of planes. Pt is deposited following the galvanic exchange of a previously deposited Cu monolayer using a Pt(2+) solution. Deposition is not epitaxial and the defects on the underlying Au(hkl) substrates are partially transferred to the Pt films. Moreover, an additional (100)-step-like defect is formed, probably as a result of the strain resulting from the Pt and Au lattice mismatch. Regarding the EOR, both vicinal Pt/Au(hkl) surfaces exhibit a behavior that differs from that expected for stepped Pt; for instance, the smaller the step density on the underlying Au substrate, the greater the ability to break the CC bond in the ethanol molecule, as determined by in situ Fourier transform infrared spectroscopy measurements. Also, we found that the acetic acid production is favored as the terrace width decreases, thus reflecting the inefficiency of the surface array to cleave the ethanol molecule.

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“…Inhomogeneity due to lateral interactions within the overlayer, on the other hand, could certainly be temperature-depenc'ent. Small variations in surface coverage with temperature can cause linewidth changes that mimic a true temperature dependence [12]. Even if the coverage is properly controlled, the density of faults in the packing of the overlayer could vary with temperature.…”

Section: Temperature Dependencementioning

confidence: 99%

“…The natural linewidth of the same vibration in the gas 2 phase is some 1010 times smaller. In recent years, the study of these linewidths has been an area of intense experimental [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and theoretical [3 ,17-43] interest. Nevertheless, a clear understanding of the important line-broadening mechanisms is only beginning to emerge.…”

Section: Introductionmentioning

confidence: 99%

An infrared emission study of the C=O stretch vibration of bridge-bonded CO on Pt(111)

Cited by 28 publications

References 27 publications

Synthesis and Characterization of Model MgO-Supported Catalysts with Pt−Mo Interactions

Synthesis and Characterization of Model MgO-Supported Catalysts with Pt−Mo Interactions

Influence of Substrate Steps on the Catalytic Properties of Pt Layers: The Ethanol Electrooxidation Reaction

Vibrational linewidths of adsorbed molecules: Experimental considerations and results

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