Method of preparing supported platinum group metal catalysts

Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants

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252439, 252462, 252466PT, 252472, 4232135, B01J 2702, B01J 2724

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active

043702600

ABSTRACT:
A refractory inorganic oxide support is impregnated with a mixture which contains a platinum sulfito complex solution, a palladium sulfito complex solution, and a rhodium nitrate solution and has a pH of from about 1 to about 5. Activation of the impregnated support provides a three-way automotive exhaust catalyst having high efficiency and improved durability by a single impregnation method.

REFERENCES:
patent: 3932309 (1976-01-01), Graham et al.
patent: 4154812 (1979-05-01), Sanchez et al.

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