The currently used threeway catalyst in passenger cars reduces CO, H2, and NOx in the exhaust if O2 is stoichiometrically introduced to the motor. However, the new lean-burn engines work with an excess of O2, thus, requiring less fuel and producing less CO2. The currently used catalyst is not able to reduce NOx under oxidizing conditions. The results of NOx reduction by H2 and CO under oxidizing conditions are presented and discussed.


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