PORÖSE, AMORPHE KIESELSÄURETONERDE, FEUERFESTE OXYDE, IHRE HERSTELLUNG UND IHRE ANWENDUNG ALS TRENNUNGSMEMBRANE

摘要

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 DEG C. to 600 DEG 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.