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US 2021/0229035 A1Published application
Method for removing nitrogen oxides from a gas
AssigneeCasale SA
InventorJean Francois Granger
Life of this patent
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Abstract
A method for removing nitrogen oxides NOx from a gaseous current, comprising the steps of: passing the gaseous current through a de-NOx catalytic bed with iron exchanged zeolite as a catalyst with the addition of ammonia as a reducing agent, wherein the molar ratio of NH3 over NOx is greater than 1.33.
Claims17
A method for removing nitrogen oxides NOx from a gaseous current, the method comprising:
- passing the gaseous current through a de-NOx catalytic bed including a catalyst that is an iron exchanged zeolite, with an addition of ammonia as a reducing agent;
- wherein a molar ratio of NH3 over NOx in the gas admitted to said de-NOx catalytic bed is 1.4 to 2;
- wherein said de-NOx catalytic bed is operated at a temperature in a range of 420° C. to 435° C.;
- and
- wherein a space velocity in said de-NOx catalytic bed is 10000 h−1 to 14000 h−1.
2 more elements
Dependencies are inferred from the claim text.