Method of waste gas treatment
AssigneeDidier Engineering GmbH
InventorsRudolf Divivier, Gotthard Uckert
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Abstract
Waste gas, for example exhaust gas from an adipic acid production process, containing nitrogen oxides and a high proportion of oxygen and/or oxygen compounds is treated to remove the nitrogen oxides by reducing the nitrogen oxides with ammonia at an elevated temperature in the presence of a catalyst comprising an iron oxide and a chromium oxide.
Claims11
A method of removing nitrogen oxides from a feed stock containing at least 10% by volume of oxygen and/or at least 12% by volume of oxygen compounds other than the nitrogen oxides, which comprises providing at least two separate beds of a catalyst comprising at least one oxide of the iron group and at least one oxide of the chromium group, and passing the feed stock sequentially through the catalyst beds while simultaneously introducing ammonia into the feed stock prior to passage of the feed stock through each catalyst bed, thus causing the nitrogen oxides to undergo a reduction reaction, said reduction reaction being carried out at a temperature between 260.degree. C. and 350.degree. C.
Dependencies are inferred from the claim text.