Preparation and Application of Metal Oxides/SBA-15 Mesoporous Composites as Catalysts for Selective Oxidation of benzyl alcohol

In this project, SBA-15 with a mesoporous pore channel structure was synthesized by a hydrothermal method and its characterization by XRD, SEM and TEM proved that the mesoporous channels had highly ordered. Ordered mesoporous supported composite metal oxide catalysts NiOx-CuOx/SBA-15 was prepared by Nanocasting using nickel nitrate and Copper nitrate as precursors. The influence of ratio of the mesoporous precursor Ni(NO3) 2 and Cu(NO3)(2) (1: 0, 3: 1, 2: 3, 2: 1, 1: 1, 2: 3, 0: 1), roasting temperature (300 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, 700 degrees C) and other influencing factors of mesoporous precursors for the selective oxidation of benzyl alcohol by supported composite metal oxides was investigated. The results represent that 88.85% could be achieved with the optimal calcination temperature of 500 degrees C, nickel copper ratio of 2:1, Catalyst dosage of 1 g, reaction temperature of 90 degrees C, reaction time of 5 h, 2.5 ml of Bnoh, 76.34% selectivity and 67.62% yield of Bzh. In the oxidation reaction with alcohol, reaction is difficult when there are electron withdrawing groups on aromatic rings; when there were no groups or electron groups on aromatic rings, active group containing alcohols had a higher conversion rate than that of Benzyl alcohol. In this composition, Ni-Cu composite oxides and their support catalysts with low raw material, simply preparation process and easy recovery were synthesized, furthermore under mild conditions, selective oxidation of benzyl alcohol in organic solvents has high catalytic activity and no environmental contamination. This manner is easy to operate, has high yield and high utilization rate of raw material that has certainly application value in chemical production of benzaldehyde.