Nickel and cobalt containing hydrotalcite-like materials...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01)

Patent

CA 2190390

A synthetic nickel (or cobalt) containing hydrotalcite-like material having a sheet-like morphology and a sheet broadness to thickness ratio of at least 50 and a formula M1-xAlx(OH)2.xA.mH2O where M is Ni or Co, A is a mono carboxylic anion of the form RCOO- where R is CnH2n+1 and n=0-5, and x and m are numbers satisfying the following conditions: 0.2 = x < = 0.4, 0.0 < =m = 4. It is made by starting with a synthesis mixture having Ni or Co (divalent cation) to aluminum (trivalent cation) molar ratio between 1:1 and 10.1, mono carboxylic anion to aluminum (trivalent cation) molar ratio between 0.1:1 to 1.2:1 and optionally added other anions. The process comprises of reacting a mixture comprising nickel (or cobalt) and aluminum cations and mono carboxylic anions in an aqueous slurry at a temperature of at least 40°C and a pH of at least 7.

L'invention concerne du nickel (ou du cobalt) de synthèse contenant une matière rappelant l'hydroalcite ayant une morphologie en forme de feuille et dont le rapport largeur-épaisseur des feuilles est d'au moins 50. Sa formule est la suivante: M1-xAlx(OH)2.xA.mH2O, où M représente le nickel ou le cobalt, A est un anion monocarboxylique de la forme RCOO-, où R représente CnH2n+1 et n est compris entre 0 et 5 et x et m sont des nombres répondant aux conditions suivantes: 0,2 < =x < = 0,4, 0,0 < =m < = 4. L'invention est obtenue à partir d'un mélange de synthèse dont le rapport molaire entre le nickel ou le cobalt (cation bivalent) et l'aluminium (cation trivalent) est compris entre 1/1 et 10/1, le rapport molaire entre l'anion monocarboxylique et l'aluminium (cation trivalent) est compris entre 0,1/1 et 1,2/1, et éventuellement d'autres anions ajoutés. L'invention consiste à faire réagir un mélange contenant du nickel (ou du cobalt), des cations d'aluminium et des anions monocarboxyliques, dans une bouillie aqueuse, à une température d'au moins 40 C et ayant un pH d'au moins 7.

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