Ultrasound-assisted preparation of titania-alumina support with high surface area and large pore diameter by modified precipitation method

摘要

Titania-alumina supports were prepared successfully using the ultrasound-assisted precipitation method. The resulting supports were characterized by fourier transform infrared analysis (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD) and N_2 physisorption. The effects of precipitants, washing method and the addition of surfactant CTAB were studied. The supports prepared with NH_4HCO_3 showed better textural properties compared with that with NH_3H_2O, which was attributed to the low NH_4~+ release rate of NH_4HCO_3. TiO_2-Al_2O_3 support with S_(bet) = 283 m~2/g, V_p = 2.34 mL/g and D_p - 33.0 nm was obtained with this modified precipitation method.