Precursor compounds of alkaline earth metal or rare earth...

Details Precursor compounds of alkaline earth metal or rare earth... Precursor compounds of alkaline earth metal or rare earth...

C - Chemistry, Metallurgy

09

K

C09K 11/80 (2006.01) C01F 7/00 (2006.01) C01F 7/16 (2006.01) H01J 17/49 (2006.01) H01J 29/20 (2006.01) H01J 61/44 (2006.01)

Patent

CA 2525836

The invention relates to a precursor compound of an alkaline earth metal or a rare earth metal aluminate of formula: a(M?1¿O).b(MgO).c(AI¿2?O¿3?) or a(M?2¿O¿1.5?).b(MgO).c(AI¿2?O¿3?), where M?1¿ = an alkaline earth metal and M?2¿ = yttrium or a combination of cerium and terbium and a, b et c are either whole numbers or not and obey the relationships: 0.25 = a = 4; 0 = b = 2 et 0.5 = c = 9, crystallized in the form of a transition alumina comprising essentially spherical and chemically homogeneous particles. Said particles have pores the average diameter of which is less than 10 nm. The above is obtained by a method in which a liquid mixture is formed comprising compounds of aluminium and other elements present in the composition of the precursor, said mixture is dried by atomisation and the dried product calcinated at a temperature between 700·C and 950·C inclusive. An alkaline earth metal or a rare earth metal aluminate is obtained by subsequent calcination of the product obtained.

La présente invention concerne un composé précurseur d'aluminate d'alcalino- terreux ou de terre rare de l'invention de formules : a(M1O).b(MgO).c(AI2O3) ou a(M2O1,5).b(MgO).c(AI2O3) dans lesquelles M1 désigne un alcalino-terreux et M2 l'yttrium ou le cérium et le terbium en combinaison et a, b et c sont des nombres entiers ou non vérifiant les relations : 0,25 <= a <= 4; 0 <= b <= 2 et 0,5 <= c <= 9 cristallisé sous la forme d'une alumine de transition; constitué de particules substantiellement sphériques et chimiquement homogènes; et ces particules comportent des pores dont le diamètre moyen est d'au moins 10 nm. Il est obtenu par un procédé dans lequel on forme un mélange liquide comportant des composés de l'aluminium et des autres éléments rentrant dans la composition du précurseur; on sèche par atomisation ledit mélange et on calcine le produit séché à une température comprise entre 700~C et 950~C. Par calcination ultérieure du produit ainsi obtenu on obtient un aluminate d'alcalino-terreux ou de terre rare.

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