Thesis (M.Eng.)--Chulalongkorn University, 2000

The role of water vapor on the selective oxidation of methanol, ethanol, 1-propanol over V-Mg-O/TiO2 catalyst is investigated. In this research, the various concentrations of water vapor (0-40%vol) have been performed to determine the role of water vapor for each reaction. Tha main products from ethanol and 1-propanol oxidation are acetaldehyde and propionaldehyde, respectively and CO2. The addition of water vapor has no strong effect in ethanol oxidation. At high temperature, yield to acetaldehyde slightly decreases. For 1-propanol oxidation, yield to propionaldehyde slightly increases. But water vapor depresses methanol conversion in the range of reaction temperature between 200-400 ํC. In the case of 2-propanol oxidation, conversion increases with the concentration of water vapor like. In addition, water vapor also promotes the formation of dehydration products, alkenes, in ethanol, 1-propanol and 2-propanol oxidation.