Synthesis and Characterization of Mesoporous Alumina via a Reverse Precipitation Method

Abstract

Abstract: 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 °C for 4 h with large pore volume of 0.90 cm³/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 cm³/g.

Key words: Mesoporous alumina, Reverse precipitation, Thermal stability

Y.S. Wu, J. Ma, F. Hu, M.C. Li. Synthesis and Characterization of Mesoporous Alumina via a Reverse Precipitation Method[J]. J Mater Sci Technol, 2012, 28(6): 572-576.

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