| http://www.w3.org/ns/prov#value | - In case that a three-way catalyst is disposed in place of the upstream-side NOx adsorbing and reducing catalyst and that the three-way catalyst is heated, when the air/fuel ratio of exhaust gas is richer (in fuel) than the stoichiometric value or around the stoichiometric value, reducing agents such as CO and H2 required for releasing and reducing adsorbed NOx are merely consumed.
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