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When amorphous silica-alumina is treated with strong acids such as hydrochloric and hydrofluoric acids, the material acts as a solid acid and becomes capable to promote reactions that require acid catalysis. Under other circumstances, when trivalent aluminum is forced by surrounding tetravalent silicon to crystallize in a tetrahedral symmetry, a partial electron deficiency occurs at the aluminum site allowing it to act as a Lewis acid, or to react with a water molecule and form a conjugated Brønsted. Natural and synthetic zeolites can be such crystalline alumino-silicates if aluminum precursors are added in the synthesis process.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Silica-alumina". A list of authors is available in Wikipedia.|