Liquid-phase Oxidation Of Toluene Over Manganese Oxides

Selective oxidation is one of privileged ways in petrochemical and fine chemical productions. It was reported that about 25% of industrial catalysis processes are through selective oxidation. Because of the high strength and weak polarity of C-H bonds, the C-H bond activation is difficult and alkanes are relatively inert. Moreover, due to the oxygen-containing products are active than the material, the deep oxidation to carbon dioxide and water easily occurred. The selective oxidation of alkanes is still one of the major challenges of modern catalysis.In this work, study on development efficient heterogeneous catalyst for the oxidation of toluene using molecular oxygen as oxidant in liquid phase was carried out. Copper manganese oxides catalysts were prepared and showed good activity for the oxidation of toluene using molecular oxygen. 63.1 % selectivity to benzoic acid, 11.7 % selectivity to benzaldehyde and 17.2 % conversion were obtained.A template-free and low temperature method for manganese oxides nanoparticles preparation was developed in this work. The Mn₃O₄ materials were composed of nearly uniform and monodisperse spherical nanoparticles with an average particle diameter of 10 nm. Results showed that the materials also showed high activity for oxidation of toluene.Among the different manganese oxides we prepared, Mn₃O₄ showed higher activity for oxidation of toluene than MnO, Mn₂O₃ and MnO₂ samples. The Mn₃O₄ catalyst prepared by precipitation showed excellent catalytic result for the oxidation of toluene using molecular oxygen. At reaction time of 3h, 61.2 %...