Method of using a simplified low cost catalyst system

Details Method of using a simplified low cost catalyst system Method of using a simplified low cost catalyst system

1981-07-20

1983-06-21

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232137, 423235, 252465, 252466PT, 252477R, B01D 5336, B01J 2368

Patent

active

043893821

ABSTRACT:
There is disclosed a method of using an exhaust gas catalyst for treatment of exhaust gases developed by burning a hydrocarbon based fuel in an internal combustion engine. These exhaust gases contain varying amounts of unburned hydrocarbons, carbon monoxide and oxides of nitrogen depending upon the operating conditions of the internal combustion engine. This specification teaches use of an improved catalyst composition in which a support medium is provided for supporting the catalyst system, the support medium having an upstream support portion and a downstream support portion over which the exhaust gases pass in succession. The upstream support portion of the support medium has palladium deposited thereon and the downstream support portion of the support medium has tungsten deposited thereon. The catalyst system has particular utility as a three-way catalyst operating at approximately stoichiometric conditions or as a catalyst for use in conjunction with the fast burn engines or as an oxidation catalyst.

REFERENCES:
patent: 3554929 (1971-01-01), Aarons
patent: 3910770 (1975-10-01), Robylinski et al.
patent: 3914377 (1975-10-01), Anderson et al.

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