HREELS study of CH3I and CH3 adsorbed on Rh(111) surface

The effect of adsorbed CO on the surface chemistry of CH3 on Rh(111)

“…Deformation modes (not shown) appeared at 1353 cm À1 [d a (CH 3 )] and 1141 cm À1 [d s (CH 3 )]. These bands can be attributed to the vibrations of adsorbed CH 3 [4,5,12,13], which basically differ from those characteristics of adsorbed azomethane [14]. Adsorption of CH 3 radicals on a CO pre-dosed Rh(1 1 1) surface produced similar spectra (Fig.…”

“…Recently, the surface chemistry of alkyl moieties has been well documented on a number of metal surfaces [1][2][3]. On the Rh(1 1 1) surface it was found that a fraction of CH 3 is hydrogenated to CH 4 above 150 K, another fraction exists on the surface up to 325 K and decomposes through the formation of CH x species to hydrogen and surface carbon [4,5].…”

A DFT investigation of the adsorption of methyl on Rh(111)

“…A few investigations about the vibrational frequencies of CH 3 on Rh(1 1 1) have been performed, and an unusually low C-H vibrational frequency of 2620 cm À1 has been observed experimentally [37][38][39][40]. Au et al have studied methane dissociation on Rh(1 1 1) using a quasi-relativistic density functional method [6,41].…”

Hydrogen Formation in the Reactions of Methanol on Supported Au Catalysts

“…1a), we may infer that the bands identified are due to adsorbed methoxy attached to ceria. Note that there was no spectral indication of the formation of adsorbed CH 3 species generated in the reaction (2), which gave absorption bands at *2,920-2,945, 1,340-1,356 and 1,175-1,195 cm -1 on Rh(111) and TiO 2 surface [46,47]. The dramatic alteration both in the high and low frequency regions of the spectra for Au/CeO 2 above 373 K, however, indicates the occurrence of a change in the adsorbed layer very likely induced by the Au.…”