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A process and apparatus for the selective catalyzed NOx reduction in oxygen-containing exhaust gases of internal-combustion engines. For improving the reduction of nitric oxides, hydrocarbons and air are supplied to the exhaust gas purifier and, for producing reactive short-chained unsaturated hydro

A process and apparatus for the selective catalyzed NOx reduction in oxygen-containing exhaust gases of internal-combustion engines. For improving the reduction of nitric oxides, hydrocarbons and air are supplied to the exhaust gas purifier and, for producing reactive short-chained unsaturated hydrocarbons, a defined quantity of fuel from the stored fuel intended for the fuel supply of the internal-combustion engine is catalytically cracked and is oxidized by the simultaneous supply of air. The resulting species are guided into the exhaust gas flow of the exhaust gases which are to be purified.

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An arrangement for selective catalyzed NOx-reduction in oxygen-containing exhaust gases of a diesel internal-combustion engine, comprising an exhaust pipe operatively connected with the engine, an exhaust gas purifier arranged in the exhaust pipe, a fuel tank operatively connected with an engine int

An arrangement for selective catalyzed NOx-reduction in oxygen-containing exhaust gases of a diesel internal-combustion engine, comprising an exhaust pipe operatively connected with the engine, an exhaust gas purifier arranged in the exhaust pipe, a fuel tank operatively connected with an engine intake of the engine, a cracked catalyst in fluid communication with the exhaust pipe upstream of the exhaust gas purifier and thermally isolated from a flow of exhaust gas from the engine, an air pipe operatively associated with the cracked catalyst, a metering pipe operatively arranged between the fuel tank and cracked catalyst, a motoring pump arranged in the metering pipe to meter diesel fuel stored in the fuel tank to the cracked catalyst, wherein a defined fuel quantity from the stored fuel is catalytically cracked to produce a substantial portion of short-chained unsaturated hydrocarbons, and the defined fuel quantity is oxidizable by air simultaneously supplied thereto from the air pipe, and a supply pipe provides the fluid communication between the exhaust pipe and the cracked catalyst for supplying in metered amounts the short-chained unsaturated hydrocarbons to the exhaust gas upstream of the exhaust gas purifier for purifying the exhaust gas.