초록 ▼

A catalytic combustion process for at least one fuel comprises the use of a plurality of successive catalytic zones, the process being characterized in that at least one of the first catalytic zones includes a catalyst comprising a monolithic substrate, a porous support based on a refractory inorgan

A catalytic combustion process for at least one fuel comprises the use of a plurality of successive catalytic zones, the process being characterized in that at least one of the first catalytic zones includes a catalyst comprising a monolithic substrate, a porous support based on a refractory inorganic oxide and an active phase constituted by cerium, iron and optionally zirconium, also at least one metal selected from the group formed by palladium and platinum; and in that at least one of the subsequent catalytic zones includes an active phase comprising: an oxide of at least one element A with valency X selected from the group formed by barium, strontium and rare-earths; at least one element B with valency Y selected from the group formed by Mn, Co and Fe; and at least one element C selected from the group formed by Mg and Zn, and aluminium; the oxide may have formula A.sub.1-x B.sub.y C.sub.z Al.sub.12-y-z O.sub.19-.delta., x being 0 to 0.25, y being 0.5 to 3; and z being 0.01 to 3; the sum y+z having a maximum value of 4 and .delta. having a value which is a function of the respective valencies X and Y of elements A and B and the values of x, y and z, and is equal to 1-1/2{(1-x)X+yY-3y-z}.

대표청구항 ▼

[ We claim:] [1.] A process for the catalytic combustion of at least one fuel comprising conducting the combustion in plurality of successive catalytic zones, said process being characterized in that at least one of the first catalytic zones includes a catalyst comprising a monolithic substrate, a p

[ We claim:] [1.] A process for the catalytic combustion of at least one fuel comprising conducting the combustion in plurality of successive catalytic zones, said process being characterized in that at least one of the first catalytic zones includes a catalyst comprising a monolithic substrate, a porous refractory inorganic oxide support and an active phase comprising (I) cerium, iron and optionally zirconium, and (II) at least one metal selected from the group consisting of palladium and platinum; and in that at least one of the subsequent catalytic zones includes an active phase comprising an oxide of:at least one element A selected from the group consisting of barium, strontium and rare-earth elements;at least one element B selected from the group consisting of manganese, cobalt and iron;at least one element C selected from the group consisting of magnesium and zinc; andaluminium.