Process for the preparation of a catalytic specie using electro-deposition.

摘要

Process for the preparation of a catalytic specie consisting essentially of a metallic support, which is coated with a ceramic active phase layer, mainly compound of the general formula (I) :
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ [Rh x Ni y Mg l Al m (OH) 2 ] z+ (A n- z/n kH 2 O,€ƒ€ƒ€ƒ€ƒ€ƒ(I)
wherein An is mainly a silicate or a polysilicate anion ; 0 ‰ x ‰ 0.3; 0 ‰ y ‰ 0.9; 0‰ I‰ 0.9;0‰ m‰ 0.5;0‰ k‰ 10;x+y>0;0.5‰ y+l‰ 0.9;x+y+l+m=1; and z is the total electrical charge of the cationic element or a compound of the general formula (II) :
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ [A z A' 1-z ][B 1-x-y Ni x Rh y ]O 3-´ €ƒ€ƒ€ƒ€ƒ€ƒ(II)
wherein A and A' are different and are selected from the Lanthanide or the Actinide families or from the group II a of the Mendeleev's periodical table of elements; B is selected from the transition metal groups of columns IIIb, IVb, Vb, VIb, VIIb, Ib and IIb and group VIIIb of the Mendeleev's periodical table of elements; 0 ‰ x ‰ 0.7,0 ‰ y ‰ 0.5, 0 ‰ x+y ‰ 0.8, 0 ‰ z ‰ 1 and ´ is the sub stoechiometric value of oxygen to obtain the electric neutrality of the Perovskite compound; said process essentially consisting in a step (a) of electro-deposition of said ceramic active phase on said metallic support. Use of said catalytic specie as a catalyst oxidation of gaseous hydrocarbons, to produce synthesis gas.