Showing papers by "Donna G. Blackmond published in 1993"

Infrared spectroscopic studies of the adsorption and reaction of 3-methyl-2-butenal over alkali-promoted ruthenium/silica catalysts

Abstract: Flow reaction studies of the hydrogenation of 3-methyl-2-butenal over Ru/SiO 2 and potassium-promoted Ru/SiO 2 were combined with in situ infrared spectroscopic monitoring of its adsorption and reaction as well as the adsorption of its reaction products. The presence of the alkali promoter significantly inhibited this hydrogenation to form the saturated aldehyde, a reaction which was followed by decarbonylation of the saturated aldehyde in a reverse migratory insertion process. The initial formation of adsorbed CO and hydrocarbon products from the saturated aldehyde may ultimately be responsible for the product distribution observed under steady-state reaction conditions

Selective Hydrogenation of α,β-Unsaturated Aldehydes Over Supported Ru

Abstract: The hydrogenation of 3-methyl 2-butenal over Ru was investigated to study the influence of alkali promoters and of the type of support on the activity and selectivity. Alkali species increased selectivity of Ru to the unsaturated alcohol, an effect which was observed both for alkali-promoted Ru/SiO 2 and for Ru supported on Y zeolites with different alkali compensating cations. The gas-phase reactions were strongly diffusion limited over the zeolite-supported Ru catalysts.