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CHEE 323

28.6

Catalytic Converters for Emission Control

Up until about 1980, catalytic converters were used to control only CO and hydrocarbon emissions.  The engine was run lean for performance reasons, and air was mixed with exhaust into the oxidizing converter.

Dispersed Pt and Pd in a 5:2 ratio on alumina was used for reasons of durability and activity (size of unit).

Comparison of relative activities of precious

and base metal catalysts

Reactant         1% CO     0.1% C2H4   0.1% C2H6

Pd           500 100        1

Pt           10012        1

Co203             80   0.6      0.05

Au             15 0.3       <0.2

MnO2             4.4 0.04

CuO             45 0.6

Fe203             0.40.006

Reaction in Oxidizing Atmosphere at 300°C

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