Sulfur the archetypal catalyst poison? The sulfur-induced promotion of the bonding of unsaturated hydrocarbons on Cu(111)

Article Abstract:

A demonstration that the presence of preadsorbed atomic sulfur promotes the bonding of cyclic unsaturated hydrocarbons to Cu(111) is presented using a combination of temperature-programmed desorption and UV photoelectron spectroscopy. The stabilizing effects of preadsorbed sulfur, through electronic effects, observed on Cu(111) contrast quite significantly with previous results on Pt(111).

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Sulfur Compounds, Usage, Spectra, Platinum compounds, Photoelectron spectroscopy, Copper compounds, Sulphur compounds

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Role of [O.sub.2] in inducing intensive fluctuations of surface-enhanced Raman scattering spectra

Article Abstract:

Confocal Raman microscopic measurements are performed on silver electrodes covered with hydrogenated amorphous carbon (a-C:H). The intensive surface enhanced Raman scattering (SERS) fluctuations could be observed for a a-C:H/Ag samples immersed in the deoxygenated electrolyte after applying a negative potential pulse to the silver electrode.

Analysis, Electric properties, Silver compounds, Raman effect, Carbon compounds

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