| http://www.w3.org/ns/prov#value | - More specifically, when the air-fuel ratio of the exhaust gas that enters the catalytic converter becomes a stoichiometric air-fuel ratio or a rich air-fuel ratio, the occlusion-type NOx absorbent discharges the occluded NOx, and the discharged NOx is reduced by a reducing agent such as CO, H2, or the like in the exhaust gas.
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