Patent ID: 6468492
Filing Date: 2002-10-22
Classification: B01J,C01B

Abstract:
A method to obtain an aluminosilicate polymer of the imogolite type, comprising the steps of:(a) contacting a mixed aluminium-silicon alkoxide or a precursor of a mixed aluminium-silicon compound with an aqueous alkali at a pH of from 4.5 to 6.5, keeping the molar concentration of aluminium between 5Ã—10âˆ’4 and 10âˆ’2 M, and the Al/Si molar ratio between 1 and 3; (b) heating the mixture obtained in step (a) at a temperature below 100Â° C. for a time sufficient to have a complete reaction to obtain the aluminosilicate polymer: and (c) removing residual ions from the polymer obtained in step (b), wherein step (a) is carried out in the presence of silanol groups, and in that after step (a) and before step (b), a ripening step at room temperature is carried out.