A RAIRS study of methoxy and ethoxy on oxidised Cu(100)

Camplin, J. P.; McCash, E.M.

doi:10.1016/0039-6028(96)00641-3

Cited by 86 publications

(80 citation statements)

References 24 publications

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“…Assignments of the observed IR bands have been made with reference to previous work of ethanol adsorption on other substrates 11,19,21 and within argon matrices. 17,18 In addition, IR bands in the gas phase, diluted solution, solid state, and liquid phase [14][15][16] have also been used to aid assignment.…”

Section: Adsorptionmentioning

confidence: 99%

“…On transition metal surfaces, ethanol has been the subject of numerous studies, 19,[22][23][24][25][26][27][28][29][30] mainly due to the potential of ethanol as an alternative fuel source. Studies have been conducted on Pt, [22][23][24] Cu, 19,25 Rh, 26,27 Pd, 28 Ni, 29 and Ir ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

“…11,[14][15][16][17][18][19][20] A detailed study by Perchard and Josien 14,15 examined gas, diluted solution, liquid, and solid state phases of ethanol, reporting 19 different vibrational bands. Assignment was made difficult based on coupling between the vibrational modes observed in each phase.…”

Section: Introductionmentioning

confidence: 99%

“…16 A limited number of IR studies of multilayer ethanol ices adsorbed on surfaces have been performed. 11,19,21 Camplin and McCash performed a RAIRS study of methanol and ethanol on an oxygen covered Cu͑100͒ surface at 78 K. 19 Spectra of physisorbed ethanol ices, in addition to four deuterated analogs, were presented. Vibrational assignments of the observed IR modes were in good agreement with those reported for matrix isolation data 17 and the gas, liquid, and glass states.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have been conducted on Pt, [22][23][24] Cu, 19,25 Rh, 26,27 Pd, 28 Ni, 29 and Ir ͑Ref. 30͒ single crystal surfaces.…”

Section: Introductionmentioning

confidence: 99%

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The adsorption and desorption of ethanol ices from a model grain surface

Burke

Wolff

Edridge

et al. 2008

The Journal of Chemical Physics

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Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Reflection absorption infrared spectroscopy ͑RAIRS͒ and temperature programed desorption ͑TPD͒ have been used to probe the adsorption and desorption of ethanol on highly ordered pyrolytic graphite ͑HOPG͒ at 98 K. RAIR spectra for ethanol show that it forms physisorbed multilayers on the surface at 98 K. Annealing multilayer ethanol ices ͑exposures Ͼ50 L͒ beyond 120 K gives rise to a change in morphology before crystallization within the ice occurs. TPD shows that ethanol adsorbs and desorbs molecularly on the HOPG surface and shows four different species in desorption. At low coverage, desorption of monolayer ethanol is observed and is described by first-order kinetics. With increasing coverage, a second TPD peak is observed at a lower temperature, which is assigned to an ethanol bilayer. When the coverage is further increased, a second multilayer, less strongly bound to the underlying ethanol ice film, is observed. This peak dominates the TPD spectra with increasing coverage and is characterized by fractional-order kinetics and a desorption energy of 56.3Ϯ 1.7 kJ mol −1 . At exposures exceeding 50 L, formation of crystalline ethanol is also observed as a high temperature shoulder on the TPD spectrum at 160 K.

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Section: Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Studies have been conducted on Pt, [22][23][24] Cu, 19,25 Rh, 26,27 Pd, 28 Ni, 29 and Ir ͑Ref. 30͒ single crystal surfaces.…”

Section: Introductionmentioning

confidence: 99%

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The adsorption and desorption of ethanol ices from a model grain surface

Burke

Wolff

Edridge

et al. 2008

The Journal of Chemical Physics

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Adsorption of [D₂]Methanol on Ru(001)O Surfaces: The Influence of Preadsorbed Oxygen on the Methoxide Geometry

Barros¹,

García²,

Ilharco³

2005

ChemPhysChem

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The influence of oxygen precoverage on the bonding geometry of methoxide on Ru(001) was studied using the isotopically labeled molecule CHD2OH by reflection-absorption infrared spectroscopy (RAIRS). This molecule is an excellent model because the vibrational spectra of CHD2O- may be unambiguously correlated with the adsorption configuration. For Ru(001)--O layers with an effective oxygen coverage (theta0) between 0.25 and 0.6 ML (ML=monolayer), the influence of the oxygen precoverage was shown to vary with the initial methanol exposure. For an extremely low dose of [D2]methanol (0.01 L; L=Langmuir, 1 L=10(-6) torr s), at 90 K, no oxygen-coverage effects were detected on the geometry of [D2]methoxide: it adsorbs in an upright orientation (pseudo-C(3v) local symmetry), just as on clean Ru(001). An increase in the methanol exposure to 0.1 L, at the same temperature, results in the formation of a disordered layer of tilted methoxide: for theta(O)=0.25 ML, C(s)/C1 and intrinsic C1 configurations are present on the surface, whereas for theta(O)> or =0.5 ML, only the former species were identified. The thermal activation of these tilted layers to 105 K results in a lower coverage of upright methoxide for any oxygen precoverage, coadsorbed with decomposition products, as confirmed by the detection of adsorbed formaldehyde and, on the denser oxygen layer (theta(O)=0.6 ML), formate. The influence of the oxygen precoverage becomes determinant when annealing a [D2]methanol multilayer to 105 K: for theta(O)=0.25 ML, the RAIR spectrum correlates with a disordered layer of tilted methoxide and formaldehyde, whereas for theta(O)=0.6 ML upright methoxide, formate, and carbon monoxide were identified. On clean Ru(001), for methanol exposures > or =0.1 L, the C(3v) methoxide configuration was never attained upon thermal activation.

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Density functional theory (DFT) investigation of the adsorption of the CH₃OH/Au(100) system

N’dollo

Moussounda

Dintzer

et al. 2013

Surface & Interface Analysis

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The adsorption of methanol on flat Au (100) surface with different coverages (θ = 1.0, 0.5 and 0.25 monolayer (ML)) is studied using density functional theory. Among the three sites (top, bridge and hollow) and coverages investigated in the present work, no adsorption is stable for θ = 1.0 ML. The most energetically preferred site of adsorption for CH 3 OH is found to be the hollow site for coverages of 0.25 ML and 0.50 ML. We also find that for all adsorption sites, an increase in CH 3 OH coverage triggers a decrease in the adsorption energy. The geometric parameters, local density of states and work function changes are analysed in detail. The coadsorption of methoxy and hydrogen has also investigated. In addition, the dissociation of methanol on Au(100) has been studied, and an activation energy was found to be 1.72 eV. This result compare with existing data in the literature for Au(111) surface.

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A RAIRS study of methoxy and ethoxy on oxidised Cu(100)

Cited by 86 publications

References 24 publications

The adsorption and desorption of ethanol ices from a model grain surface

The adsorption and desorption of ethanol ices from a model grain surface

Adsorption of [D₂]Methanol on Ru(001)O Surfaces: The Influence of Preadsorbed Oxygen on the Methoxide Geometry

Density functional theory (DFT) investigation of the adsorption of the CH₃OH/Au(100) system

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A RAIRS study of methoxy and ethoxy on oxidised Cu(100)

Cited by 86 publications

References 24 publications

The adsorption and desorption of ethanol ices from a model grain surface

The adsorption and desorption of ethanol ices from a model grain surface

Adsorption of [D2]Methanol on Ru(001)O Surfaces: The Influence of Preadsorbed Oxygen on the Methoxide Geometry

Density functional theory (DFT) investigation of the adsorption of the CH3OH/Au(100) system

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Product

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Adsorption of [D₂]Methanol on Ru(001)O Surfaces: The Influence of Preadsorbed Oxygen on the Methoxide Geometry

Density functional theory (DFT) investigation of the adsorption of the CH₃OH/Au(100) system