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- W2017185138 abstract "An investigation has been made by infrared spectroscopy of the surface species obtained from the adsorption of acetaldehyde on a silica-supported nickel catalyst which is active in promoting the decarbonylation reaction. Techniques are described which are successful in separately assessing which features of the spectra arise from adsorption on the metal and which from adsorption on the silica parts of surface, respectively. After evacuation of the gas-phase and physically adsorbed acetaldehyde the dominant surface species found on the metal through its infrared absorption bands is of the alkoxide type. Reasons are given for assigning the associatively adsorbed structure CH3 · CHM-OM (M = surface metal atom) to this species. As bands from this species decay in intensity on heating, spectra from decarbonylation products increase in intensity. Bands are also observed from carbon monoxide and the CH3COO− ion chemisorbed on the metal; the latter probably arises from a slow oxidation reaction on the surface. No bands were observed which could be assigned to the surface acyl species CH3 · CO · M. Infrared bands are also observed from C2H5OSi groups on the silica surface and from physically adsorbed paraldehyde which builds up on the surface more slowly. These species do not occur on the adsorption of acetaldehyde on silica alone and must also result from catalytic processes involving nickel. The oxidation of acetaldehyde to R · COO−, and the reduction process which forms ethoxide groups on silica, may be initiated by dissociative adsorption of some acetaldehyde molecules on the metal surface." @default.
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- W2017185138 date "1971-03-01" @default.
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- W2017185138 title "Infrared spectroscopic studies of adsorption and catalysis V. Acetaldehyde on silica-supported nickel" @default.
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- W2017185138 doi "https://doi.org/10.1016/0021-9517(71)90096-0" @default.
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