Method of preparing cerium dioxide nanoparticles

Details Method of preparing cerium dioxide nanoparticles Method of preparing cerium dioxide nanoparticles

C - Chemistry, Metallurgy

01

F

C01F 17/00 (2006.01) B01J 19/18 (2006.01) C10L 1/08 (2006.01)

Patent

CA 2662782

A method of making cerium dioxide nanoparticles includes: a) providing an aqueous reaction mixture having a source of cerous ion, a source of hydroxide ion, a nanoparticle stabilizer, and an oxidant at an initial temperature no higher than about 2O°C; b) mechanically shearing the mixture and causing it to pass through a perforated screen, thereby forming a suspension of cerium hydroxide nanoparticles; and c) raising the initial temperature to achieve oxidation of cerous ion to eerie ion and thereby form cerium dioxide nanoparticles having a mean diameter in the range of about 1 nm to about 15 nm. The cerium dioxide nanoparticles may be formed in a continuous process.

L'invention concerne un procédé de préparation de nanoparticules de dioxyde de cérium, comprenant : a) l'utilisation d'un mélange réactionnel aqueux comprenant une source d'ions céreux, une source d'ions hydroxyde, un stabilisateur de nanoparticules et un oxydant à une température initiale inférieure ou égale à environ 20 °C ; b) le cisaillement mécanique du mélange et son passage au travers d'un tamis perforé, formant ainsi une suspension de nanoparticules d'oxyde de cérium ; et c) l'élévation de la température initiale pour réaliser l'oxydation des ions céreux en ions cériques et former ainsi des nanoparticules de dioxyde de cérium ayant un diamètre moyen compris entre environ 1 nm et environ 15 nm. Les nanoparticules de dioxyde de cérium peuvent être formées par un procédé continu.

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