反应详情

The alumina hydrate employed in the present invention was prepared by the procedure described below. Aluminum octoxide was synthesized according to the process disclosed in U.S. Pat. No. 4,242,271, and was hydrolyzed to obtain an alumina slurry. This alumina slurry was diluted with water to a solid alumina hydrate content of 5 mass, and was aged at 80° C. for 10 hours. This colloidal sol was spray-dried to obtain alumina hydrate. This alumina hydrate was mixed and dispersed with deionized water. The pH of the mixture was adjusted to pH 10 by addition of nitric acid. This mixture was aged for 5 hours to obtain a colloidal sol. This colloidal sol was desalted, and was peptized by addition of acetic acid. The alumina hydrate obtained from this colloidal sol by drying was subjected to an X-ray diffraction measurement, and was found to have a pseudo-boehmite structure. Observation by transmission electron microscopy shows that this pseudo-boehmite is in a shape of a spindle.

1. customwas prepared by the procedure
2. customto obtain an alumina slurry
3. customThis colloidal sol was spray-dried