Thyssenkrupp Industrial Solutions Ag

Thyssenkrupp Uhde Gmbh

Stefan Pinnow

Meinhard Schwefer

Rolf Siefert

Disclosed herein is a device and method for lowering the content of NOand NO in gases. The device comprises a container having therein two reaction steps connected in series. The first step removes NO(DeNOstage) by reducing NOwith a nitrogen-containing reducing agent. Downstream thereof, the second step removes NO by catalytic decomposition of NO to Nand O(DeNO stage). Each step comprises one or more catalyst beds through which flows gas to be purified. The catalyst bed of the DeNOstage containing zeolites doped with transition metals, including lanthanides. The at least one catalyst bed of the DeNO-stage contains one or more catalytically active compounds of elements selected from groups 5 to 11 of the Periodic Table, but not iron-doped zeolites. A device for introducing a nitrogen-containing reducing agent into the stream of the NOand NO-containing gas is further disposed upstream of the DeNOstage.

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Elsdorf, Germany

Stefan Pinnow