Fabrication and Excellent Catalytic Performance of Three-dimensional Ordered Mesoporous Molybdenum Oxides

Three-dimensional (3D) ordered and wormhole-like MoO3 mesoporous structures were synthesized based on ultrasound-assisted vacuum impregnation method. Carbon template was used in the synthesis process, which was prepared by using mesoporous molecular sieve KIT-6. Hexaammonium molybdate acted as molybdenum source. The as-prepared MoO3 samples were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), thermogravimetric analysis/differenctial scanning calorimetry (TG/DSC), and N2 adsorption-desorption measurement. The catalytic performance of MoO3 mesoporous structure was evaluated by hydrogen temperature-programmed reduc- tion (H2-TPR), and complete oxidation of toluene and carbon monoxide (CO). It was found that the initiation tem- peratures of toluene were 203℃, 215℃ and 225℃, respectively, and the initiation temperatures of CO were 114℃, 158℃ and 180℃, respectively, with their conversion rates of 50%, 90% and 100%, respectively. The well catalytic performance was attributed to 3D ordered mesoporous structure and high surface area of as-obtained MoO3 materials.