Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-01-23
1978-12-05
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
4232135, B01J 2104, B01J 2342, B01J 2346
Patent
active
041285069
ABSTRACT:
A three-way layered catalyst adapted for use in a system operating at about the stoichiometric air/fuel ratio having significantly improved resistance to poisoning in automotive exhaust comprising an alumina support having a first layer of the catalyst material platinum positioned at the support surface and penetrating the body thereof to a desired depth with an inner second layer of the catalyst material rhodium, the second layer being adjacent to the first layer and penetrating the body of the support, the maximum concentration of platinum being at or near the surface of the support with the minimum concentration of rhodium in the first layer being at or close to the surface and increasing in concentration to a maximum to define the boundary between the first and second layers, the concentrations of platinum and rhodium decreasing inwardly from the boundary with the greater portion of rhodium being in the second layer.
REFERENCES:
patent: 4051072 (1977-09-01), Bedford et al.
patent: 4051073 (1977-09-01), Hegedus et al.
Hegedus Louis
Summers Jack C.
Carter Sidney
General Motors Corporation
Shine W. J.
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