Preparation of Cu-Mn/Zr-Ce-SBA-15 Catalyst with Short Mesochannels and Its Catalytic Performance for Toluene Combustion

The mesoporous Zr-Ce-SBA-15 (ZCS) material with short mesochannels was synthesized through a hydrothermal route.A series of Cu-Mn/ZCS catalyst samples with different Cu/Mn ratios and Cu-Mn contents were prepared by impregnation.The structure of the catalyst samples was characterized by N2 adsorption-desorption,transmission electron microscopy,scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The catalytic performance of the catalyst for toluene combustion was evaluated in a fixed-bed microreactor.The results reveal that the Cu-Mn/ZCS catalyst has unique hexagonal platelet morphology and possesses highly ordered two-dimensional hexagonal mesoporous structure with short channels (0.4-0.5 μm).The specific surface area,pore volume,and pore diameter of the 20%Cu-Mn/ZCS are 296 m2/g,0.42 cm3/g,and 6.4 nm,respectively.Compared with 20%Cu-Mn/SBA-15 with longer channel length (1-2 μm),the temperature of 95% toluene conversion (T95) over 20%Cu-Mn/ZCS decreases from 284 to 270 oC,indicating that the short channeled Cu-Mn/ZCS catalyst possesses higher catalytic activity than that over Cu-Mn/SBA-15.