| http://www.w3.org/ns/prov#value | - Thus, the reaction proceeds in the reverse direction (NO3 ??????NO+2O*), and the nitrate ions NO3 ??? in the NOx catalyst are released from the NOx catalyst in the form of NO. When the exhaust gas contains the reducing agent such as HC or CO, the NOx thus released reacts with the HC or CO and is reduced.
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