Device for the purification of exhaust gas

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine

Reexamination Certificate

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Details

C423S213500, C423S213700, C423S245300, C423S247000, C423S239100, C423S239200, C060S299000, C060S300000

Reexamination Certificate

active

07820123

ABSTRACT:
As a device for the purification of exhaust gas, a three-way catalyst A purifying hydrocarbon, carbon monoxide and nitrogen oxide in the vicinity of theoretical air-fuel ratio is disposed at an upstream side of the exhaust gas and an adsorption catalyst B provided with zeolite effective for the adsorption of hydrocarbon is disposed at a downstream side of the exhaust gas.

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