Porous amorphous silica-alumina refractory oxides, their preparation and use as separation membranes
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United States of America Patent
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Mar 28, 2000
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N/A
app pub date -
Aug 25, 1998
filing date -
Jun 2, 1992
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Expired
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Abstract
A process for preparing a porous amorphous silica-alumina refractory oxide is described in which a source of silica, such as tetra ethyl ortho silicate, in a non-aqueous solvent, such as an alcohol, is hydrolysed by adding an aqueous solution containing aluminum ions, in particular a solution of aluminum nitrate, thereby to form a sol and calcining the sol at, for example, 200.degree. C. to 600.degree. C. The product, which may have a microporous or mesoporous structure, is useful in the separation of fluids, especially the separation of carbon dioxide from natural gas.
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