EFFECT OF PHASE PROPERTIES OF W-V-O CATALYSTS ON THEIR ACTIVITY IN THE ETHANOL OXIDATION REACTION

Abstract

The activity of binary tungsten-vanadium oxide catalysts in the reaction of ethanol oxidation was studied in this work. Ethylene and acetic acid have been found to be the main products of the vapor-phase oxidation of ethanol on tungsten-vanadium oxide catalysts. Depending on the reaction temperature, acetaldehyde and carbon dioxide are also formed in significant quantities. It is shown that acetic acid is the main product of ethanol oxidation at low reaction temperatures, while ethylene is the main product at high temperatures. The influence of the composition of binary tungsten-vanadium oxide catalysts on their activity in the ethanol oxidation reaction has been studied. The studies performed have shown that with an increase in the atomic ratio of tungsten to vanadium, the yield of acetic acid decreases, while the yields of acetaldehyde and ethylene increase. X-ray diffraction studies of binary vanadium-containing catalysts have been carried out. It has been established that three phases are formed in the W-V-O system: two modifications of WO3 and one V2O5. The degrees of crystallinity of the studied catalysts were also calculated. The degrees of crystallinity and activity of binary tungsten-vanadium oxide catalysts in the ethanol oxidation reaction are compared. It has been established that an increase in the degree of crystallinity of the catalyst contributes to a change in the direction of the ethanol oxidation reaction towards the formation of ethylene and acetaldehyde. Keywords: ethanol, acetic acid, ethylene, binary catalysts, vanadium oxide, tungsten oxide