| http://www.w3.org/ns/prov#value | - The processes for catalytic reduction of nitrogen oxides with ammonia as the reducing agent which have been proposed so far can be divided roughly into two groups: (1) processes using a catalyst wherein the active ingredient is a noble metal such as platinum or palladium and (2) processes using a catalyst wherein the active ingredient is a compound of a base metal, particularly a non-noble transit
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