Evidence for an Eley–Rideal mechanism in the addition of hydrogen atoms to unsaturated hydrocarbons on Cu(111)

Xi, Ming

doi:10.1116/1.586037

Cited by 76 publications

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“…Previous studies by Bent and coworkers have shown that benzene adsorbs and desorbs molecularly on the Cu ( I I I ) surface (12). As for the close-packed Pt and Rh surfaces, the first monolayer of benzene adsorbs with the molecular plane parallel to the surface plane (12).…”

Section: Subject Terms Is Number Of Pagesmentioning

confidence: 99%

“…As for the close-packed Pt and Rh surfaces, the first monolayer of benzene adsorbs with the molecular plane parallel to the surface plane (12). From temperature-programmed desorption (TPD) of perdeutero (d6-) benzene on Cu{ 1 II) it is known that multilayer and monolayer coverages of benzene desorb from the surface below 250K.…”

Section: Subject Terms Is Number Of Pagesmentioning

confidence: 99%

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Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Stranick

Kamna

Weiss

1994

Science

154

139

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The interface between a two-dimensional (2D) molecular gas and a 2D molecular solid has been imaged with a low-temperature, ultrahigh-vacuum scanning tunneling microscope. The solid consists of benzene molecules strongly bound to step edges on a Cu{111} surface. Benzene molecules on the Cu{111} terraces move freely as a 2D gas at 77 kelvin. Benzene molecules transiently occupy well-defined adsorption sites at the 1D edge of the 2D solid. Diffusion of molecules between these sites and exchange between the two phases at the interface are observed. On raised terraces of the copper surface, the 2D gas is held in a cage of the solid as in a 2D nanometer-scale gas bulb.

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Section: Subject Terms Is Number Of Pagesmentioning

confidence: 99%

Section: Subject Terms Is Number Of Pagesmentioning

confidence: 99%

Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Stranick

Kamna

Weiss

1994

Science

154

139

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“…18,19 It was reported that on Cu surface hydrogenation of acetylene with adsorbed atomic hydrogen is unlikely. 12 Intuitively, we could assume that styrene with an ethylene group is also less likely for hydrogenation on Cu(111) with adsorbed atomic hydrogen. In Figure 1, the 102 amu peak at 170 K is assigned to multilayer PA.…”

Section: Resultsmentioning

confidence: 99%

“…10,11 For adsorbed ethylene and benzene on Cu(111), the adsorbed molecules more plausibly react with atomic hydrogen in gas phase than with adsorbed atomic hydrogen. 12 Selective hydrogenation reaction is also of very importance. Pd catalysts have been used for the removal of acetylene impurity from ethylene without forming ethane from ethylene, 13 Additionally, the selective hydrogenation of PA to styrene is of importance to obtain pure styrene without producing other products such as ethylbenzene.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Phenylacetylene to Styrene on Pre-C_xH_y- and C-Covered Cu(111) Single Crystal Catalysts

Sohn¹,

Wei²,

White³

2011

Bulletin of the Korean Chemical Society

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Thermal hydrogenation of phenylacetylene (PA, C 8 H 6 ) to styrene (C 8 H 8 ) on pre-C x H y -and C-covered Cu(111) single crystal substrates has been studied using temperature-programmed desorption (TPD) mass spectrometry. Chemisorbed PA with an acetylene group has been proved to be associated with hydrogen of pre-adsorbed C x H y to form styrene (104 amu) on Cu surface. For the parent (PA) mass (102 amu) TPD profile, the TPD peaks at 360 K and 410 K are assigned to chemisorbed vertically aligned PA and flat-lying cross-bridged PA, respectively (J. Phys. Chem. C 2007, 111, 5101). The relative I 360K /I 410K TPD ratio dramatically increases with increasing pre-adsorbed C x H y before dosing PA, while the ratio does not increase for pre-C-covered surface. For PA on pre-C x H y -covered Cu(111) surface, styrene desorption is enhanced relative to the parent PA desorption, while styrene formation is dramatically quenched on pre-C-covered (lack of adsorbed hydrogen nearby) surface. It appears that only cross-bridged PA associates with adsorbed hydrogen to form styrene that promptly desorbs at 410 K, while vertically aligned PA is less likely to participate in forming styrene.

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“…Assisted by temperature programmed desorption, X-ray and ultra-violet photoelectron spectroscopies, we have studied CH3I which has widely been a Deceased August 31,2007 employed for understanding (heterogeneous) catalytic photochemical and thermal reaction processes of halocarbons adsorbed on a metal substrate. [12][13][14][15][16][17] Because the initial thermal or photo-dissociation channel is a breakage of C-I bond, and no reformation of C-I bond occurs it is possible to separately elucidate the behaviors of CH3 and I.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Photochemistry of Methyl Iodide on Ice Film Grown on Cu(111)

Sohn

White

2009

Bulletin of the Korean Chemical Society

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Thermal and photochemistry of methyl iodide (CH3I) adsorbed on D2O ice film on Cu(111) at 100 K were studied using temperature-programmed desorption (TPD) time-of-flight mass spectrometry (TOF-MS), X-ray and ultraviolet photoelectron spectroscopies. On the basis of TPD, multilayer and monolayer CH3I molecules desorb from D2O ice layer at 120 and 130 K, respectively. Photo-irradiation at 100 K exhibits dramatic changes in the TPD and I 3d5/2 XPS of CH3I on ice film, due to a dramatic dissociation of CH3I. The dissociation is likely activated by solvated electrons transferred from the metal substrate during photo-irradiation. No other photo-initiated reaction products were found within our instrumental detection limit. During photo-irradiation, the CH3I, CH3 and I could be trapped (or solvated) in ice film by rearrangement (and self-diffusion) of water molecules. A newly appeared parent molecular desorption peak at 145 K is attributed to trapped CH3I. In addition, the CH3 and I may diffuse through ice and chemisorb on Cu(111), indicated by TPD and I 3d5/2 XPS taken with photo-irradiation time, respectively. No molecular ejection was found during photo-irradiation at 100 K. The work functions for CH3I/Cu(111), D2O/Cu (111) and CH3I/D2O/Cu(111) were all measured to be about 3.9 eV, 1.0 eV downward shift from that of clean Cu(111).

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Evidence for an Eley–Rideal mechanism in the addition of hydrogen atoms to unsaturated hydrocarbons on Cu(111)

Cited by 76 publications

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Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Hydrogenation of Phenylacetylene to Styrene on Pre-C_xH_y- and C-Covered Cu(111) Single Crystal Catalysts

Thermal and Photochemistry of Methyl Iodide on Ice Film Grown on Cu(111)

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Evidence for an Eley–Rideal mechanism in the addition of hydrogen atoms to unsaturated hydrocarbons on Cu(111)

Cited by 76 publications

References 0 publications

Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Atomic-Scale Dynamics of a Two-Dimensional Gas-Solid Interface

Hydrogenation of Phenylacetylene to Styrene on Pre-CxHy- and C-Covered Cu(111) Single Crystal Catalysts

Thermal and Photochemistry of Methyl Iodide on Ice Film Grown on Cu(111)

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Hydrogenation of Phenylacetylene to Styrene on Pre-C_xH_y- and C-Covered Cu(111) Single Crystal Catalysts