Hjs Fahrzeugtechnik Gmbh & Co.

Basf Aktiengesellschaft

Daimler-benz Ag

Werner Weisweiler

Friedrich Wirbeleit

Bernd Krutzsch

Walter Boegner

Guenter Wenninger

Georg Huthwohl

Bernd Maurer

Michael Kraemer

Gerd Nagel

A process for reducing nitrogen oxides on a SCR catalyst disposed in an exhaust gas system of an internal combustion engine is performed by a device adapted to introduce ammonia (NH ) into the exhaust gas flow of the exhaust gas system before it reaches the SCR catalyst. The device includes a heatable pressure-tight converter, an NH store and a control unit with control signals processing engine operating characteristics and determining therefrom the NO output for controlling a timed valve for injection of an NH dose.

Process for reducing nitrogen oxides on SCR catalyst

An exhaust gas purification system for denoxing exhaust gases has a converter containing a substance thermolytically separable into NH,, a feed line connecting the converter with an exhaust gas line for supplying NH,into the exhaust gas flow therein, a dosing device in the feed line for dosing the NH,to be introduced into the exhaust gas flow, a heatable cold-start store connected to the feed line between the converter and dosing device for providing the substance during starting of a combustion unit connected to the exhaust gas line, an air feeding device having two air conduits provided with valves wherein one conduit is connected to the feed line between the cold-start store and dosing device and the other conduit is connected to a mixing chamber located in the feed line after the dosing device, and a reservoir container for storing the substance connected to a filling pipe terminating in the converter.

Exhaust gas purification system for denoxing exhaust gases from combustion units

A process and apparatus for the selective catalyzed NO.sub.x 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.

Process and apparatus for selective catalyzed no-reduction in

The invention relates to a continuous process for coating bundles of fibers, particularly carbon fibers, with a layer of silicon--which may be present as the carbide, oxide, nitride, or plasma polymer with carbon and hydrogen or in elementary form--by radio-frequency sputtering. The coated fibers are suitable in particular for the manufacture of reinforced plastics.

Coating fibers with a layer of silicon

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Remchingen, Germany

Werner Weisweiler