Synthesis and Characterization of Mesoporous Alumina via a Reverse Precipitation Method

摘要

Mesoporous alumina γ-Al_2O_3 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-Al_2O_3 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-Al_2O_3 with better properties can be obtained by changing the preparation parameters.High BET surface area of 340(m^2)/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.