| abstract |
A multiple zeolite catalyst mixture for purifying exhaust gases from an internal combustion engine, comprising: a first NO 2 to N 2 to conversion catalyst component; a second O 3 conversion catalyst component; a third HC conversion catalyst component; a fourth N 2 O decomposition catalyst component; and, a fifth VOC reduction catalyst component; wherein the catalyst component mixture includes about 50 to 75 weight percent of the first and second catalyst components, and about 25 to 50 weight percent of the third, fourth, and fifth catalyst components. |