Dependence of the activity of copper-tungsten oxide catalysts in the ethanol oxidation reaction on their acidic properties

Abstract

The reaction of ethanol oxidation on copper-tungsten oxide catalysts has been studied. It has been shown that the main products of ethanol oxidation reaction on tungsten-copper oxide catalysts are acetaldehyde, ethylene, and carbon dioxide. It has been found that with an increase in the reaction temperature, the yields of acetaldehyde and acetone pass through a maximum, while the yields of ethylene and carbon dioxide increase over the entire temperature range studied, reaching their maximum value at 500°C. It has been shown that, on the studied copper-tungsten oxide catalysts, the dependences of the yields of acetaldehyde on the composition of the catalyst have the form of curves with two maxima. In order to characterize the acidic properties of the surface of the studied catalysts, their activity was studied in the isomerization of butene-1 to butenes-2. It was found that when copper is introduced into the composition of the tungsten oxide catalyst, the total yield of butenes-2 passes through a maximum on samples rich in tungsten. It is shown that an increase in the degree of isomerization of binary copper-tungsten oxide catalysts leads to a rise in the yields of ethanol partial oxidation products and a decrease in the yield of carbon dioxide.