Appeal No. 96-3486
Application No. 08/291,565
optionally at least one bonding agent and
optionally at least one mineral acid or
organic acid;
(c) coating a ceramic or metal substrate with the
suspension obtained in step (b);
(d) calcining the coated substrate from step (
c);
(e) impregnating said coated and calcined
substrate with any
remainder or all of said precursor of
metal A; and
(f) heat-activating said coated, calcined, and
impregnated substrate obtained from (e).
25. A catalyst produced according to the process of claim
1.
26. In the catalytic conversion and/or elimination of
pollutants present in the exhaust gases of internal
combustion engines, the improvement comprising passing
said gases in contact with a catalyst according to claim
25.
27. In a process for producing a catalyst containing a
ceramic or metal substrate having deposited thereon a
porous layer of at least one refractory inorganic oxide,
which is [.alpha]-alumina, [.gamma]-alumina, [.Delta]-alumina, eta-alumina,
theta-alumina, kappa-alumina, rho-alumina, chi-alumina,
silica, a silica-alumina, a zeolite, a silica-magnesia,
titanium oxide, zirconium oxide, or a mixture thereof; at
least one iron oxide; and at least one cerium oxide; at
least one metal A, and, optionally, at least one compound
of metal B; said process comprising forming a powder and
applying said powder to said substrate, the improvement
in forming said powder which comprises atomizing an
aqueous suspension of at least one powder of said
refractory inorganic oxide, at least one soluble cerium
salt, at least one soluble iron salt, optionally at least
one portion of at least one insoluble compound and/or at
least one soluble salt of said metal B, and optionally at
least one portion of at least one metal A that was
previously deposited by impregnation of at least one
precursors [sic] thereof on at least one of the solid
constituents that are present so as to recover a powder.
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