Interaction of oxygen and of ethylene dichloride with silver surfaces

Meisenheimer, R.G.

doi:10.1016/0021-9517(62)90018-0

Cited by 23 publications

(2 citation statements)

References 6 publications

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“…On extended silver surfaces, the effect of coadsorbed chlorine on the selectivity of ethene epoxidation is well-known. − Less well examined is the role that chlorine, adsorbed on coinage metals, plays in surface reactions involving the formation of carbon−carbon bonds. One example is the formation of 1,5-hexadiene from allyl chloride on Cu(100) and Ag(111) .…”

Section: Introductionmentioning

confidence: 99%

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO

et al. 2000

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Ethene, propene, allyl chloride, and carbon monoxide were used to probe the effects of adding an average of one chlorine atom for every eight Ag atoms of a Ag(111) surface. On the basis of reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD), this coverage is sufficient to alter the electronic structure of more than 95% of the surface Ag atoms. For CO, C2H4, and C3H6, TPD peak temperatures increase, indicating increased adsorbate-substrate bond strength, and vibrational bands are both red-and blue-shifted compared to the case for adsorption on clean Ag(111). Modes reflecting interactions of π adsorbate orbitals with the substrate are particularly sensitive to the presence of Cl. These changes are attributed to altered electronic structure of Ag atoms, i.e., partially empty d-band character, induced by the presence of electron-withdrawing Cl. C3H5Cl is different in that C-Cl bond dissociation to form Cl and C3H5 (allyl) accompanies adsorption on both clean and Cl-covered Ag(111). The influence of adsorbed Cl on the thermal chemistry of C3H5 is evident in TPD, and the adsorption structure taken by adsorbed C3H5 is evident in RAIRS.

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Section: Introductionmentioning

confidence: 99%

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO

et al. 2000

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“…Changes in silver surfaces in the presence of gases and vacuum have been discussed by others. [10][11][12][13][14][15][16][17][18][19][20] It is obviously impossible to deduce the structure of the new surface generated by OAOR cycling with the certainty of direct techniques such as field emission, low energy electron diffraction, and electron microscopy. However, it does not seem implausible to conclude that the adsorbed oxygen atom ions order the silver atoms into small stable arrays or facets in the chemisorptive rearrangement process.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Cyclic Oxygen Adsorption and Reduction on a Silver Surface

Czanderna¹

1966

J. Phys. Chem.

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The Interaction of Oxygen with Silver Powders. A Comparison Between Esca Results and Volumetric Measurement

Chen

Cheng

Yeh

1989

J Chinese Chemical Soc

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interactions ofoxygen ...ithsilver powders have heen studied with acombination ofangle-resolved ESCA and volumetric adsorption. Three states ofadsorbed oxygen, i.e., atomically adsorbed oxygen, dissolved oxygen, and surface oxide, arecharacterized by O(ls)-ESCA peaks atbindingenergies of530.2,532.0, and 529.3 eVrespectively. The £SCA studies also suggest that atomically adsorbed oxygen dissolves into thesubsurface ofsilver powders attemperatures above 100°C, and then transforms into oxide (Ag 2 0 ) at 175°C. Adsorbed oxygen on thesilver powders was partially desorbed at temperatures higher than IBO°C. The lransformation and desorption informarioa obtained from ESCA satisfactorily explains thevariation of theadsorption isotherm with temperature obtained from [he volumetric adsorption of oxygen on AgiSiOr catalysts.

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Interaction of oxygen and of ethylene dichloride with silver surfaces

Cited by 23 publications

References 6 publications

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO

The Effect of Cyclic Oxygen Adsorption and Reduction on a Silver Surface

The Interaction of Oxygen with Silver Powders. A Comparison Between Esca Results and Volumetric Measurement

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Interaction of oxygen and of ethylene dichloride with silver surfaces

Cited by 23 publications

References 6 publications

Chlorine-Modified Properties of Ag(111) Probed by C2H4, C3H6, C3H5Cl, and CO

Chlorine-Modified Properties of Ag(111) Probed by C2H4, C3H6, C3H5Cl, and CO

The Effect of Cyclic Oxygen Adsorption and Reduction on a Silver Surface

The Interaction of Oxygen with Silver Powders. A Comparison Between Esca Results and Volumetric Measurement

Contact Info

Product

Resources

About

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO

Chlorine-Modified Properties of Ag(111) Probed by C₂H₄, C₃H₆, C₃H₅Cl, and CO