Abstract
Mesoporous alumina powders were synthesized by the evaporation induced self assembly (EVIS) method. Aluminum isopropoxidem, aluminum nitrate and Tri-block copolymer (pluronic P123) were used as inorganic precursors and structuring agent in this study. The prepared sols were aged under 94% relative humidity (RH) for different periods of time. The aged samples were calcined at 400°C for 8h. The effect of aging time on the pore characteristics was studied using Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption, small and wide angle X-ray diffraction, and high resolution transmission electron microscopy. The results revealed that aging time had a significant impact on the pore size, pore volume, surface area and the degree of pore ordering in the final product. The maximum BET surface area of 307m2/g and the corresponding pore size of about 4nm was obtained for the sol aged for two weeks.
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