Studies On The Liquid-phase Catalytic Oxidation Of Toluene

Regardless of petroleum chemical industry or the fine chemical industry, the hydrocarbon compound oxidation all has the extremely important status. So it is still one of challenging research difficult problem that seeking the highly effective hydrocarbon compound oxidative catalyst and the oxidized method. Liquid phase oxidation of toluene reaction process is a kind of environmental friendly production process. The toluene liquid-phase oxidation reaction has important research meaning, because of the mild reaction condition and high yield. This paper aims to liquid phase conditions, using molecular oxygen as the oxidant, studying on the oxidation of toluene with the different catalytic systems. The main points in this dissertation include the following aspects:(1)The selective oxidation of toluene was carried out under solvent-free conditions, molecular oxygen as the oxygen source, over the different metal and potassium carbonate catalysts. Although the conversion of toluene is low, it has a better selectivity to benzaldehyde. Through condition optimization, the conversion of toluene reached5.1%, and converted completely to benzaldehyde and benzyl alcohol with the selectivity for benzaldehyde of59.2%.(2)A series of MnOx/SBA-15catalysts were prepared, and characterized the structure by solid UV, XRD and XPS. Through condition optimization, the conversion of toluene was20.1%, the selectivity for benzoic acid and benzaldehyde were76.5%and12.2%respectively.(3)The OMS catalysts were prepared with SBA-15as support. When OMS and SBA-15mass ratio is0.5:1, the catalytic perfermance is the best. Through condition optimization, when the catalyst is0.1g, under180℃for3h, the conversion of toluene can reach26.3%and the selectivity for benzoic acid was83.9%.