| http://www.w3.org/ns/prov#value | - Such temperatures commonly occur in motor vehicles with Otto engines, but are comparatively rare with Diesel engines and especially in internal combustion engines having direct fuel injection.The preferred NO.sub.x storage materials are distinguished in that, under conditions of net oxidation, i.e., a stoichiometric excess of oxidizing agents, such as occurs in the exhaust gas during the operation
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