Sol-gel synthesis, characterization and photocatalytic activity of mesoporous TiO2/gamma-Al2O3 granules

Abstract

Mesoporous TiO2/gamma-Al2O3 composite granules were prepared by combining sol-gel/oil-drop method, using various titania solution. The product granules can be used as a photocatalyst or adsorbent in moving, fluidized bed reactors. The phase composition and pore structure of the granules can be controlled by calcination temperature and using different titania solution. In the photocatalysis of NH3 decomposition, TiO2/gamma-Al2O3 granules using Degussa P25 powder treated thermally at 450 degrees C showed the highest catalytic ability. However, TiO2/gamma-Al2O3 granules using titania made by hydrothermal method had comparable performance in NH3 decomposition.