Synthesis and Characterization of Mesoporous Alumina via a Reverse Precipitation Method

Mesoporous alumina γ-Al₂O₃ with high specific surface area and large pore volume is prepared by using a facile reverse precipitation method from sodium aluminate and nitric acid.The effects of terminal pH value,aging time and thermal stability on the characterization of γ-Al₂O₃ are studied by means of X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）,Brunauer-Emmett-Teller（BET） method and scanning electron microscopy（SEM）.The results show that γ-Al₂O₃ with better properties can be obtained by changing the preparation parameters.High BET surface area of 340（m²）/g can be obtained by calcining at 500 ℃ for 4 h with large pore volume of 0.90（cm）³/g and average pore size of 7.6 nm.After calcining at 1000°,the surface area is still 86 m2/g and the pore volume is 0.37（cm）³/g.