| http://www.w3.org/ns/prov#value | - uted ofoxidizing agents (O.sub.2, NO.sub.x, etc.) and reducing agents (HC, CO, H.sub.2, etc.), and the NO.sub.x adsorbed on the adsorbing catalyst is contacted and reacted with the reducing agent such as HC to reduce the NO.sub.x to N.sub.2.Now, roughly saying, the NO.sub.x in the exhaust gas comprises NO and NO.sub.2.
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