Process for obtaining refractory metal oxides based on silica by sol-gel route in aqueous medium

摘要

Process for obtaining by sol-gel route refractory metal oxides based on silica in which a monolithic gel is prepared, in an aqueous medium, at a temperature of less than 60° C., by leaving at rest an aqueous sol obtained by simple mixing in stoichiometric quantities of an aqueous sol of silicic acid and of one or more aqueous solutions of a water- soluble salt of one or more other constitutive metals of these oxides, then the monolithic gel obtained is calcined at a temperature of less than 1000° C. after it has been dried at a temperature of less than 150° C.