| http://www.w3.org/ns/prov#value | - A promising approach to NOX removal from exhaust streams containing excess O2 is selective catalytic reduction of the NOX with a reducing agent such as CO or an added hydrocarbon, using a catalyst called a selective lean NOX catalyst (???lean NOX catalyst???) Such catalysts have been extensively investigated over the last 20 years (see, for example, Shelef (1995) Chem.
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