Reactivation of automobile exhaust oxidation catalyst

Details Reactivation of automobile exhaust oxidation catalyst Reactivation of automobile exhaust oxidation catalyst

1974-03-27

1976-04-13

Garvin, Patrick P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

208140, 252415, B01J 802, B01J 2396

Patent

active

039504913

ABSTRACT:
Oxidation catalysts containing platinum or other noble metal components used in automobile exhaust emission control are reactivated, after thermal deactivation, by subjecting the catalyst to a halogen-containing gas at a temperature of from 500.degree.F. to about 1000.degree.F. The passing of carbonyl halide or a mixture of carbon monoxide and halogen, alone or in a carrier gas, over the catalyst reduces the CO-oxidation and hydrocarbon-oxidation temperature to almost that of fresh catalyst. Carbonyl chloride or the carbon monoxide-chlorine mixture is preferred. This treatment may also be used in the reactivation of noble metal-containing reforming catalysts.

REFERENCES:
patent: 2906702 (1959-09-01), Brennan et al.
patent: 3134732 (1964-05-01), Kearby et al.
patent: 3247128 (1966-04-01), White et al.
patent: 3551516 (1970-12-01), Ashley et al.

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