Abstract
Vapors of AlCl3 and of TiCl4 were adsorbed on SBA-15 at 20–100°C. The volatile compounds adsorbed on the surface were hydrolyzed by water vapor at 25°C, and the product of hydrolysis was dried at 80–200°C. The above procedure results in a metal-modified silica with specific surface area and pore volume lower than those of the original SBA-15 silica, but the honeycomb structure is preserved. The properties of metal-modified silicas can be adjusted by varying the time and temperature of deposition of chlorides, and by post-treatment. The above procedure can be applied to metals other than Al or Ti, and it can also be repeated several times with different metal precursors to produce composites containing more than one metal.
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