Pyrogenically-produced cerium oxide useful in polishing sensitive electronics surfaces, as a heat stabilizer for silicone rubber or as a catalyst has specified coarse and fine fractions

摘要

Pyrogenically-produced cerium oxide of BET surface area 15-200 m2/g comprises: (a) a coarse fraction of crystalline, non- aggregated particles of average diameter 30-200 nm; and (b) a fine fraction of fine, crystalline aggregated primary particles of average aggregate diameter 5-50 nm. An Independent claim is also included for production of the cerium oxide.