Benzene adsorption and oxidation on Ir(111)

Weststrate, C.J.; Bakker, J.W.; Gluhoi, Andreea C.; Ludwig, Wiebke; Nieuwenhuys, B.E.

doi:10.1016/j.susc.2006.11.008

Cited by 16 publications

(23 citation statements)

References 33 publications

(42 reference statements)

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“…Based on the H 2 desorption spectra it is concluded that all hydrogen has left the surface at this temperature, and the new features in the C 1s spectrum are, therefore, assigned to C (x)ad . In our previous study about benzene adsorption and decomposition on IrA C H T U N G T R E N N U N G (111) [14] a mixture of C ad and C x H y was found above 520 K when the total carbon coverage was similar to the total carbon coverage shown in this experiment ( % 0.15 ML "C"). Furthermore, the C 1s spectrum at this point looks very similar to the C 1s spectrum obtained at 540 K during ethanol decomposition.…”

Section: Adsorption and Decomposition On The Clean Surfacesupporting

confidence: 80%

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Ethanol Adsorption, Decomposition and Oxidation on Ir(111): A High Resolution XPS Study

et al. 2007

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Ethanol (C(2)H(5)OH) adsorption, decomposition and oxidation is studied on Ir(111) using high-energy resolution, fast XPS and temperature-programmed desorption. During heating of an adsorbed ethanol layer a part of the C(2)H(5)OH(ad) desorbs molecularly, and another part remains on the surface and decomposes around 200 K; these two decomposition pathways are identified, as via acetyl (H(3)C--C=O) and via CO(ad)+CH(3ad), respectively. Acetyl and CH(3ad) decompose around 300 K into CH(ad) (and CO(ad)). CH(ad) decomposes forming C(x) and H(2) around 520 K. In the presence of O(ad) an acetate intermediate is formed around 180 K, as well as a small amount of CH(3ad) and CO(ad). Acetate decomposes between 400-480 K into CO(2), H(2)(/H(2)O) and CH(ad).

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Section: Adsorption and Decomposition On The Clean Surfacesupporting

confidence: 80%

“…[14,15] The Ir single crystal was cleaned using Ar + sputtering (3 kV) and annealing cycles A C H T U N G T R E N N U N G (%1400 K) followed by oxygen treatment. The oxygen was removed either by flashing to 1400 K or by heating in the presence of H 2 .…”

Section: Methodsmentioning

confidence: 99%

Ethanol Adsorption, Decomposition and Oxidation on Ir(111): A High Resolution XPS Study

et al. 2007

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“…The second two peaks at 52 and 72 meV are in the area of metal-carbon stretching vibrational modes measured for systems like benzene adsorbed on Rh(111) [80] (rhodium belong to the same group of the Periodic Table as iridium): Two peaks at 43 and 68 meV were assigned to the Rh-C stretching vibrations of the benzene molecule adsorbed flat on the Rh(111) surface. Given that the desorption temperature/binding energy of benzene on Rh(111) [80] and Ir(111) [81] are alike, the metal-carbon stretching vibrations should be similar on both surfaces. We thus tentatively assign the features at 52 and 72 meV to Ir-C bonds formed in the hydrogenated gr/Ir(111) samples, This leaves the 178-meV spectral feature unassigned.…”

Section: Resultsmentioning

confidence: 99%

Hydrogenated graphene on Ir(111): A high-resolution electron energy loss spectroscopy study of the vibrational spectrum

et al. 2016

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International audienceHydrogen atom adsorption on high-quality graphene on Ir(111) [gr/Ir(111)] is investigated using high-resolution electron energy loss spectroscopy. The evolution of the vibrational spectrum, up to 400 meV, of gr/Ir(111) upon increasing hydrogen atom exposures is measured. The two dominant binding configurations of atomic hydrogen are identified as (1) graphanelike hydrogen clusters on the parts of the graphene more strongly interacting with the Ir(111) surface and (2) dimers bound more weakly to the freestanding parts of the graphene. The graphanelike surface structures lead to increased corrugation of the graphene sheet, yielding graphane-related phonon components. Additionally, a recent theoretical prediction of the existence of a bending character for a LO/TO graphane chair phonon mode is experimentally verified. No clear evidence was found for hydrogen bound on both sides of a high-quality graphene sheet and phonon features strongly suggest interactions between graphanelike hydrogen clusters and Ir atoms in the substrate

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“…The adsorption and catalytic decomposition of hydrocarbons on transition-metal surfaces have been studied intensively because of their fundamental interest and technological importance. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Considerable attention has been directed towards the hydrogenation and dehydrogenation reactions of adspecies at (sub)monolayer coverage on single-crystal surfaces. Regarding chemisorbed benzene, a parallel orientation of the aromatic ring with respect to the surface is commonly proposed because molecular adsorption is dominated by p-bonding interactions.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of multilayer benzene and n-hexane films on vanadium

Souda

2015

Phys. Chem. Chem. Phys.

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Reactions of multilayer hydrocarbon films with a polycrystalline V substrate have been investigated using temperature-programmed desorption and time-of-flight secondary ion mass spectrometry. Most of the benzene molecules were dissociated on V, as evidenced by the strong depression in the thermal desorption yields of physisorbed species at 150 K. The reaction products dehydrogenated gradually after the multilayer film disappeared from the surface. Large amount of oxygen was needed to passivate the benzene decomposition on V. These behaviors indicate that the subsurface sites of V play a role in multilayer benzene decomposition. Decomposition of the n-hexane multilayer films is manifested by the desorption of methane at 105 K and gradual hydrogen desorption starting at this temperature, indicating that C-C bond scission precedes C-H bond cleavage. The n-hexane dissociation temperature is considerably lower than the thermal desorption temperature of the physisorbed species (140 K). The n-hexane multilayer morphology changes at the decomposition temperature, suggesting that a liquid-like phase formed after crystallization plays a role in the low-temperature decomposition of n-hexane.

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Benzene adsorption and oxidation on Ir(111)

Cited by 16 publications

References 33 publications

Ethanol Adsorption, Decomposition and Oxidation on Ir(111): A High Resolution XPS Study

Ethanol Adsorption, Decomposition and Oxidation on Ir(111): A High Resolution XPS Study

Hydrogenated graphene on Ir(111): A high-resolution electron energy loss spectroscopy study of the vibrational spectrum

Decomposition of multilayer benzene and n-hexane films on vanadium

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