Abstract: Process for the preparation of alpha, beta unsaturated aldehydes by oxidation of alcohols in the presence of a liquid phase wherein the liquid phase contains 0.1 to less than 25 weight-% water and wherein the liquid phase contains at least 25 weight-% of alcohol(s) of general formula (II) and alpha, beta unsaturated aldehyde(s) of general formula (I) and wherein the oxidant is oxygen and/or hydrogen peroxide.

Abstract: Process for the preparation of alpha, beta unsaturated aldehydes by oxidation of alcohols in the presence of a liquid phase wherein the liquid phase contains 0.1 to less than 25 weight-% water and wherein the liquid phase contains at least 25 weight-% of alcohol(s) of general formula (II) and alpha, beta unsaturated aldehyde(s) of general formula (I) and wherein the oxidant is oxygen and/or hydrogen peroxide.

Abstract: The present invention provides a catalyst comprising alumina as carrier material and palladium or platinum as active component, obtainable by a) impregnating an alumina carrier with a solution comprising at least one salt of the active component palladium or platinum, b) drying the catalyst thus obtained, c) treating the catalyst thus obtained with hydrogen, or a mixture of hydrogen and at least one inert gas, for a period of 1 to 24 hours at a temperature of 30 to 200° C., and d) thereafter keeping the catalyst thus reduced in the presence of hydrogen, or a mixture of hydrogen and at least one inert gas, for a period of 1 hour to 10 days at a temperature of 10 to 100° C. The catalyst provided by the invention is useful in processes for isomerization of olefins from olefin-containing hydrocarbonaceous mixtures having 4 to 20 carbon atoms at temperatures of 10 to 150° C. and pressures of 1 to 35 bar.