Perovskite material, preparation method and use in catalytic...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/40 (2006.01) B01D 7/02 (2006.01) B01D 53/22 (2006.01) B01D 53/32 (2006.01) C01B 3/36 (2006.01)

Patent

CA 2531592

The invention concerns a mixed electronic and O?2-¿ anion conductive perovskite material, of formula (I): A?(a)¿¿(1 -x-u)?? ¿A.prime.?(a-1)¿ ¿x ?A.prime..prime.?(a¿.prime..prime.?)¿¿u? B?(b)¿¿(1-s-y-v)? B?(b+1)¿¿s? B.prime.?(b+.beta.)¿¿y? B.prime..prime.?(b.prime..prime.)¿¿v? O¿3-d?, wherein: a, a-1, a.prime..prime., b, b+1, b+.beta. et b.prime..prime. are integers representing respective valences of the atoms A, A.prime., A.prime..prime., B, B.prime., B.prime..prime.; a, a.prime..prime., b, b.prime..prime., .beta., x, y, s, u, v et .delta. such that the electrical neutrality of the crystal lattice is preserved; A represents an atom selected among scandium, yttrium or in the families of lanthanides, actinides or alkaline-earth metals; A.prime..prime. represents an atom selected among Al, Ga, In, or Tl; B, B.prime., B.prime..prime. represents an atom selected among the transition metals, Al, In, Ga, Ge, Sb, Bi, Sn or Pb;. The invention also concerns the method for preparing said material and its use as mixed conductive material of a catalytic membrane reactor, for use in synthesizing synthetic gas by oxidation of methane or natural gas.

Matériau conducteur mixte électronique et d'anions O2- de type perovskite, de formule (I) : A(a)(1 -x-u) A.prime.(a-1) xA.prime..prime.(a.prime..prime.)u B(b)(1-s-y-v) B(b+1)s B.prime.(b+.beta.)y B.prime..prime.(b.prime..prime.)v O3- .delta., formule (I) dans laquelle : a, a-1, a.prime..prime., b, b+1, b+.beta. et b.prime..prime. sont des nombres entiers représentant les valences respectives des atomes A, A.prime., A.prime..prime., B, B.prime., B.prime..prime. ; a, a.prime..prime., b, b.prime..prime., .beta., x, y, s, u, v et .delta. sont tels que la neutralité électrique du réseau cristallin est conservée, A représente un atome choisi parmi le scandium, l'yttrium ou dans les familles des lanthanides, des actinides ou des métaux alcalino-terreux, A.prime. est un atome choisi parmi le scandium, l'yttrium ou dans les familles des lanthanides, des actinides ou des métaux alcalin-terreux ; A.prime..prime. un atome choisi parmi Al, Ga, In ou Tl ; B, B.prime., B.prime..prime. un atome choisi parmi les métaux de transition, Al, In, Ga, Ge, Sb, Bi, Sn ou Pb ; procédé pour sa préparation et son utilisation comme matériau conducteur mixte d'un réacteur catalytique membranaire, destiné à être mis en .oelig.uvre pour synthétiser du gaz de synthèse par oxydation de méthane ou de gaz naturel.

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