Coadsorption of oxygen and water at Ni(110) surfaces

Hock, M.; Seip, U.; Bassignana, I.C.; Wagemann, Kurt; Küppers, J.

doi:10.1016/0039-6028(86)90131-7

Cited by 23 publications

(6 citation statements)

References 12 publications

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“…Instead, we observe a strong feature at 83 meV, which is reminiscent of the OHbending frequency reported for OH on NiA C H T U N G T R E N N U N G (110) at 84 meV. [17] Finally, the appearance of a feature at 34 meV is consistent with the hindered translational modes of OH. On PtA C H T U N G T R E N N U N G (111) two separate features appear at 43 and 29 meV.…”

Section: Vibrational Spectrasupporting

confidence: 70%

“…For example, HREELS studies have suggested that the adsorption site of OH is the threefold hollow site, [4,13] whereas STM, HREELS, low-energy electron diffraction (LEED), and densi-ty functional theory (DFT) studies suggest a preference for the top site. [2,3] Since the early studies by Fisher and Sexton, adsorbed OH has been identified on several other metal surfaces, for example, PdA C H T U N G T R E N N U N G (100), [14] SiA C H T U N G T R E N N U N G (100), [15] and NiA C H T U N G T R E N N U N G (110), [16,17] most often by HREELS. Oddly, OH has not yet been identified on NiA C H T U N G T R E N N U N G (111), which is the dominating surface structure on nickel catalyst particles.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Hydroxyl on Ni(111)

2009

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Hydroxyl (OH) is identified and characterized on the Ni(111) surface by high-resolution electron energy loss spectroscopy. We find clear evidence of stretching, bending, and translational modes that differ significantly from modes observed for H(2)O and O on Ni(111). Hydroxyl may be produced from water by two different methods. Annealing of water co-adsorbed with atomic oxygen at 85 K to above 170 K leads to the formation of OH with simultaneous desorption of excess water. Pure water layers treated in the same fashion show no dissociation. However, the exposure of pure water to 20 eV electrons at temperatures below 120 K produces OH in the presence of adsorbed H(2)O. In combination with temperature-programmed desorption studies, we show that the OH groups recombine between 180 and 240 K to form O and immediately desorbing H(2)O. The lack of influence of co-adsorbed H(2)O at 85 K on the O-H stretching mode indicates that OH does not participate in a hydrogen-bonding network.

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Section: Vibrational Spectrasupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Identification of Hydroxyl on Ni(111)

2009

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“…The first three features are typical of HCOO, a species containing a carbon atom bound to a single oxygen atom, and H 2 O, respectively. The feature at 531.0 eV is compatible with the presence of CO, HCOO, and OH groups. , XPS spectra therefore confirm the TPD hint that C−O bond scission in the CO 2 molecule has occurred already at 90 K. HREEL spectra at 90 K (Figure ) show, in addition to the CO 2 losses, , the presence of hydrogen (115, 125 meV), formate (48, 98, 167, 355−365 meV), water (200, 445, 455 meV), and OH groups (55, 415 meV) . The losses at 228, 235, and 250 meV are ascribed to CO, which therefore forms already at 90 K upon a hydrogen-assisted CO 2 dissociation mechanism.…”

supporting

confidence: 63%

“…16,27 XPS spectra therefore confirm the TPD hint that C-O bond scission in the CO 2 molecule has occurred already at 90 K. HREEL spectra at 90 K (Figure 4) show, in addition to the CO 2 losses, 16,17 the presence of hydrogen (115, 125 meV), 29 formate (48, 98, 167, 355-365 meV), 16 water (200, 445, 455 meV), 30 and OH groups (55, 415 meV). 30 The losses at 228, 235, and 250 meV are ascribed to CO, 31 which therefore forms already at 90 K upon a hydrogen-assisted CO 2 dissociation mechanism. The low intensity of the CO-related losses at 90 K is attributed both to the low CO coverage (0.10 ML) and to the screening effect due to the large overall coverage (∼1 ML).…”

supporting

confidence: 63%

Hydrogen-Assisted Transformation of CO₂ on Nickel: The Role of Formate and Carbon Monoxide

Vesselli

Rizzi

Rogatis

et al. 2009

J. Phys. Chem. Lett.

114

138

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The nanoscale description of the reaction pathways and of the role of the intermediate species involved in a chemical process is a crucial milestone for tailoring more active, stable, and cheaper catalysts, thus providing “reaction engineering” capabilities. This level of insight has not been achieved yet for the catalytic hydrogenation of CO2 on Ni catalysts, a reaction of enormous environmental relevance. We present a thorough atomic-scale description of the mechanisms of this reaction, studied under controlled conditions on a model Ni catalyst, thus clarifying the long-standing debate on the actual reaction path followed by the reactants. Remarkably, formate, which is always observed under standard conditions, is found to be just a “dead-end” spectator molecule, formed via a Langmuir−Hinshelwood process, whereas the reaction proceeds through parallel Eley−Rideal channels, where hydrogen-assisted C−O bond cleavage in CO2 yields CO already at liquid nitrogen temperature.

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“…The shoulder at B3400 cm À1 and the relatively weak feature at 1680 cm À1 are indicative of molecular water bound to the surface (i.e., a hydrogen bonded O-H stretch and a H-O-H scissors motion, respectively). 32,39,40 The difference in features observed for water dosed at low temperature versus high temperature, in particular the appearance of peaks corresponding to dissociation of water, suggests that the surface temperature of the mineral is an important aspect of its reactivity. 4 RAIRS spectra of Fe 2 NiP before (black spectrum) and after (blue and red spectra) exposure to H 2 O.…”

mentioning

confidence: 99%

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

Cruz

Qasim

Abbott-Lyon

et al. 2016

Phys. Chem. Chem. Phys.

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aWe present a study of the reactions of the meteoritic mineral schreibersite (Fe,Ni) 3 P, focusing primarily on surface chemistry and prebiotic phosphorylation. In this work, a synthetic analogue of the mineral was synthesized by mixing stoichiometric proportions of elemental iron, nickel and phosphorus and heating in a tube furnace at 820 1C for approximately 235 hours under argon or under vacuum, a modification of the method of Skála and Drábek (2002). Once synthesized, the schreibersite was characterized to confirm the identity of the product as well as to elucidate the oxidation processes affecting the surface. In addition to characterization of the solid product, this schreibersite was reacted with water or with organic solutes in a choline chloride-urea deep eutectic mixture, to constrain potential prebiotic products. Major inorganic solutes produced by reaction of water include orthophosphate, phosphite, pyrophosphate and hypophosphate consistent with prior work on Fe 3 P corrosion. Additionally, schreibersite corrodes in water and dries down to form a deep eutectic solution, generating phosphorylated products, in this case phosphocholine, using this synthesized schreibersite.

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Coadsorption of oxygen and water at Ni(110) surfaces

Cited by 23 publications

References 12 publications

Identification of Hydroxyl on Ni(111)

Identification of Hydroxyl on Ni(111)

Hydrogen-Assisted Transformation of CO₂ on Nickel: The Role of Formate and Carbon Monoxide

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

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Coadsorption of oxygen and water at Ni(110) surfaces

Cited by 23 publications

References 12 publications

Identification of Hydroxyl on Ni(111)

Identification of Hydroxyl on Ni(111)

Hydrogen-Assisted Transformation of CO2 on Nickel: The Role of Formate and Carbon Monoxide

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

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Product

Resources

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Hydrogen-Assisted Transformation of CO₂ on Nickel: The Role of Formate and Carbon Monoxide