| 摘要 |
A porous amorphous silica-alumina refractory oxide is prepared by a process 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 aluminium ions, in particular a solution of aluminium 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. The calcined porous SiO2-Al2O3 may have a porosity of 10-70% and a modal pore diameter of 6-20 ANGSTROM . |
