Silicon-aluminium mixed oxide

Details Silicon-aluminium mixed oxide Silicon-aluminium mixed oxide

C - Chemistry, Metallurgy

04

B

57/20, 261/38

C04B 35/10 (2006.01) C01B 13/22 (2006.01) C01B 33/18 (2006.01) C01B 33/26 (2006.01) C01F 7/02 (2006.01) C01F 7/30 (2006.01) C09K 3/14 (2006.01)

Patent

CA 2307057

A silicon-aluminium mixed oxide produced by flame hydrolysis and having a composition of from 1 to 99.999 wt.% Al2O3, the remainder being SiO2. The mixed oxide exhibits an amorphous structure in the X-ray diffraction pattern and consists of intergrown primary particles. In these primary particles crystallites are present; these crystallites having sizes of between one and 200 nanometres and the specific surface area of the powder being between 5 and 300 m2/g. The silicon-aluminium mixed oxide is produced by a process wherein silicon halide and aluminium halide are vaporised in a particular ratio to one another, and are homogeneously mixed with air, oxygen and hydrogen in a mixing unit by means of a carrier gas. This mixture undergoes combustion in a burner of known construction and, after the separation of the solids from the vapour phase, any traces of halide possibly adhering to the product are separated off in a further processing step by means of moist air at elevated temperature.

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