초록 ▼

The present invention concerns a process for obtaining a ceric oxide having a large specific surface area. The process according to the invention consists of subjecting a ceric hydroxide prepared by hydrolysis of a cerium IV salt solution, to solvothermal treatment prior to calcination. The ceric ox

The present invention concerns a process for obtaining a ceric oxide having a large specific surface area. The process according to the invention consists of subjecting a ceric hydroxide prepared by hydrolysis of a cerium IV salt solution, to solvothermal treatment prior to calcination. The ceric oxide thus obtained has a large specific surface area at high temperature.

대표청구항 ▼

A process for obtaining a ceric oxide having a specific surface area of at least 15 m2/g, measured after calcination at a temperature of between 800°and 900°C., said process comprising (i) placing a ceric hydroxide in suspension in water or in a watery decomposable base solution to provide a medium,

A process for obtaining a ceric oxide having a specific surface area of at least 15 m2/g, measured after calcination at a temperature of between 800°and 900°C., said process comprising (i) placing a ceric hydroxide in suspension in water or in a watery decomposable base solution to provide a medium, said ceric hydroxide being represented by formula (I): Ce(OH)x(NO3)y, pCeO2, NH2O (I); wherein X=4-y, y ranges from 0.35 to 1.35, p ranges from 0 to 2.0, and n ranges from 0 to 20; (ii) heating the medium in a sealed chamber until a temperature and pressure are obtained which are less than the critical temperature and pressure of the medium; (iii) cooling the medium and bringing it back to atmospheric pressure; (iv) separating the resulting ceric hydroxide; and (v) calcining the ceric hydroxide.