Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Patent
1984-05-15
1986-04-08
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
502242, 502245, 502250, 502251, 502254, 502257, 502259, 502260, 502261, 502262, 502263, 502303, 502304, 4232135, B01J 2310, B01J 2362, B01J 2364, B01J 2370
Patent
active
045813434
ABSTRACT:
A pollution control catalyst for a catalytic converter in the exhaust system of an internal combustion engine, which catalyst comprises a support impregnated with (i) at least one platinum group precious metal, and with (ii) cerium base metal, or a combination of cerium and at least one other base metal, is facilely prepared by (1) impregnating a catalyst support with precursor compounds of said cerium base metal, or of said cerium base metal and of at least one other base metal, (2) activating said impregnated support, under a neutral or oxidizing atmosphere, at a temperature ranging from 120.degree. to 800.degree. C., (3) impregnating said catalyst support with precursor compounds of said at least one platinum group precious metal, together with a delayed-action organic reducing agent, inactive under cold conditions, which effects reduction of said platinum group precious metal precursor compounds, but not of any cerium or other base metal precursor compounds, under the conditions of the step (4) below, and (4) activating said impregnated catalyst, also under a neutral or oxidizing atmosphere, at a temperature ranging from 300.degree. to 800.degree. C.
REFERENCES:
patent: 4283308 (1981-08-01), Ohara et al.
patent: 4378307 (1983-03-01), Brunelle et al.
patent: 4426319 (1984-01-01), Blanchard et al.
Blanchard Gilbert
Brunelle Jean-Pierre
Doziere Richard
Goldenberg Emmanuel
Prigent Michel
Pro-Catalyse
Shine W. J.
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