Exhaust emission purification catalyst and engine controller
OwnerKinichi IWACHIDOinventor
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Abstract
An exhaust emission purification catalyst which purifies exhaust gas of an engine, includes: a carrier which is formed with a plurality of cell holes; and a plurality of catalytic layers which are carried in the plurality of cell holes. The plurality of catalytic layers includes: a first layer including an auxiliary catalyst that includes a zeolite including a transition metal that occludes NOx in the exhaust gas during a time period of low temperature; and a second layer disposed adjacent to a surface of the first layer and including a main catalyst that includes at least one of an alkali metal and an alkali earth metal and that occludes the NOx occluded in the auxiliary catalyst when temperature of the main catalyst reaches active temperature.
Claims7
An exhaust emission purification catalyst which purifies exhaust gas of an engine, the exhaust emission purification catalyst comprising:
- a carrier which is formed with a plurality of cell holes;
- and
- a plurality of catalytic layers which are carried in the plurality of cell holes, the plurality of catalytic layers including:
- a first layer including an auxiliary catalyst that includes a zeolite including a transition metal that occludes NOx in the exhaust gas during a time period of low temperature;
- and
- a second layer disposed adjacent to a surface of the first layer and including a main catalyst that includes at least one of an alkali metal and an alkali earth metal and that occludes the NOx occluded in the auxiliary catalyst when temperature of the main catalyst reaches active temperature.
Dependencies are inferred from the claim text.