Fuel additive containing lattice engineered cerium dioxide...

C - Chemistry – Metallurgy – 01 – F

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C01F 17/00 (2006.01) B01J 23/10 (2006.01) C10L 10/02 (2006.01)

Patent

CA 2747547

A process for making cerium dioxide nanoparticles containing at least one transition metal (M) utilizing a suspension of cerium hydroxide nanoparticles prepared by mechanical shearing of an aqueous mixture containing an oxidant in an amount effective to enable oxi-dation of cerous ion to eerie ion, thereby forming a product stream that contains transition metal-containing cerium dioxide nanoparticles, Cel-xMxO2, wherein "x" has a value from about 0.3 to about 0.8. The nanoparticles thus ob-tained have a cubic fluorite structure, a mean hydrodynam-ic diameter in the range of about 1 nm to about 10 nm, and a geometric diameter of less than about 4 run. The transi-tion metal-containing crystalline cerium dioxide nanoparti-cles can be used to prepare a dispersion of the particles in a nonpolar medium.

La présente invention concerne un procédé de réalisation de nanoparticules de dioxyde de cérium contenant au moins un métal de transition (M), au moyen d'une suspension de nanoparticules d'hydroxyde de cérium. Ces nanoparticules sont préparées par cisaillement mécanique d'un mélange aqueux contenant un oxydant en une quantité efficace pour permettre l'oxydation d'ion céreux en ions cériques. Ceci forme un flux de produit qui contient des nanoparticules de dioxyde de cérium contenant un métal de transition, Cel-xMxO2, « x » ayant une valeur d'environ 0,3 à environ 0,8. Les nanoparticules ainsi obtenues possèdent une structure de fluorite cubique, un diamètre hydrodynamique moyen situé dans la plage d'environ 1 nm à environ 10 nm, et un diamètre géométrique inférieur à environ 4 nm. Les nanoparticules de dioxyde de cérium cristallines contenant un métal de transition peuvent être utilisées pour préparer une dispersion des particules dans un milieu non polaire.

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