초록 ▼

Morphologically improved ceric oxide particulates have a BET specific surface, measured after calcination at a temperature of from 350°to 450°C., of at least 100 m2/g, a total pore volume of at least 0.3 cm3/g, and the pores of which having a mean diameter larger than 50 Å. The improved ceric oxide

Morphologically improved ceric oxide particulates have a BET specific surface, measured after calcination at a temperature of from 350°to 450°C., of at least 100 m2/g, a total pore volume of at least 0.3 cm3/g, and the pores of which having a mean diameter larger than 50 Å. The improved ceric oxide particulates are prepared by reacting a cerium salt with a strong base in the presence of carboxylate ions, or a cerium carboxylate with a strong base; separating the precipitate of true cerium hydroxide thus produced; and washing, heat-treating, and calcining such precipitate.

대표청구항 ▼

Ceric oxide particulates having a specific surface, after calcination at a temperature of from 350°to 450°C., of at least 100 m2/g, a total pore volume of at least 0.3 cm3/g, and the pores of which having a mean diameter larger than 50 Å. true cerium hydroxide thus produced, and washing and heat-tre

Ceric oxide particulates having a specific surface, after calcination at a temperature of from 350°to 450°C., of at least 100 m2/g, a total pore volume of at least 0.3 cm3/g, and the pores of which having a mean diameter larger than 50 Å. true cerium hydroxide thus produced, and washing and heat-treating such precipitate.