Emissions reduction of high and low polluting new technology vehicles equipped with a CeO2 catalytic system

The efficiency of a catalytic system that provides the vehicle combustion c hamber with an adequate amount of cerium oxide (CeO2), without affecting th e operational parameters of the engine, has been studied for pollutant emis sions reduction. New technology gasoline engine passenger cars, equipped wi th this catalytic system, have been driven on their normal route by the sam e drivers, in order to obtain the same traffic conditions and the same driv ing mode, as far as possible. These vehicles were tested for CO and HC emis sions before and after the installation of the catalytic system. The new te chnology passenger cars examined have been divided into two categories usin g as criterion the level of their initial emissions (before the installatio n of the CeO2 catalytic system). The two categories are: (a) high polluting cars with CO and HC emissions above the implemented standards; and (b) low polluting cars with emissions below the standards. Both car categories equ ipped with the CeO2 system, present important reduction of the pollutant em issions. The results are interpreted statistically and they are correlated with other studies. (C) 1999 Elsevier Science B.V. All rights reserved.