Platinum Catalysts for Exhaust Purification

Stringent regulations governing automobile exhaust emissions are due to come into force i n the United States. Johnson Matthey have undertaken the development of platinum-based catalytic reactors for control of these exhaust emissions. Two new types of catalyst have demonstrated the feasibility of exhaust control by catalytic means, nnd have been incorporated on test vehicles to achieve emission levels well below the specijied levels for 1975 and 1976 model year curs. Extended road mileage on the former system has shown that good durability can be obtained. zoith emissions below 1975 limits for 25,000 miles.