Aqueous colloidal dispersion of a cerium compound and at...

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 13/36 (2006.01) A61K 8/19 (2006.01) A61K 8/26 (2006.01) A61K 8/27 (2006.01) A61K 8/28 (2006.01) A61K 8/29 (2006.01) A61K 8/36 (2006.01) A61Q 17/04 (2006.01) A61Q 19/00 (2006.01) B01J 23/10 (2006.01) B01J 35/00 (2006.01) C01F 17/00 (2006.01) C01G 25/00 (2006.01)

Patent

CA 2398785

The invention concerns an aqueous colloidal dispersion of a cerium compound and at least another element M selected among rare earths other than cerium, titanium, vanadium, chlorine, manganese, iron, cobalt, nickel, copper, zinc, aluminium, gallium and zirconium. Said dispersion is characterised in that it exhibits conductivity not more than 5mS/cm. The method for obtaining it consists in reacting with a base a mixture of at least a cerium salt and at least a salt of said element M in the presence of an acid in an amount such that the atomic ratio H?+¿/(Ce+M) is greater than 0.1, then in redispersing in water the precipitate derived from the previous reaction. Said dispersions can be used in catalysis, for lubrication, in ceramics and as anti-corrosive agents.

L'invention concerne une dispersion colloïdale aqueuse d'un composé de cérium et d'au moins un autre élément M choisi parmi les terres rares autres que le cérium; le titane, le vanadium, le chlore, le manganèse, le fer, le cobalt, le nickel, le cuivre, le zinc, l'aluminium, le gallium et le zirconium. Cette dispersion est caractérisée en ce qu'elle présente un conductivité d'au plus 5mS/cm. Elle est obtenue par un procédé dans lequel on fait réagir avec une base un mélange d'au moins un sel de cérium avec au moins un sel d'un élément M précité et en présence d'un acide en quantité telle que le rapport atomique H?+¿/(Ce+M) soit supérieur à 0,1, puis on redisperse dans l'eau le précipité issu de la réaction précédente. Les dispersions de ce type peuvent être utilisées en catalyse, en lubrification, dans les céramiques, dans la fabrication de composés luminophores, dans la cosmétique et en tant qu'agents d'anticorrosion.

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