Catalytic reduction of NOx using methane in the presence of oxygen
AssigneeAir Products and Chemicals, Inc.
InventorsYuejin Li, John N. Armor
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Abstract
The invention describes a catalytic process for destroying NOx from oxygen-containing combustion products wherein methane serves as a reductant. The process comprises contacting the NOx-containing combustion products with a desired amount of methane and oxygen in the presence of a metal-exchanged crystalline zeolite having a silicon to aluminum ratio of greater than or equal to about 2.5 under conditions sufficient to effect conversion to gaseous nitrogen, water and carbon oxides. The zeolites are exchanged with a cation selection from the group consisting of cobalt, nickel, iron, chromium, rhodium and manganese.
Claims35
A process for destroying nitrogen oxides comprising:
- reacting the nitrogen oxides, methane and oxygen in the presence of a crystalline zeolite having a silicon to aluminum ratio of greater than or equal to about 2.5 wherein the zeolite is exchanged with an effective amount of a cation selected from the group consisting of cobalt, nickel, iron, chromium, rhodium and manganese under conditions sufficient to convert the nitrogen oxides to gaseous nitrogen, water and carbon oxides.
A process for destroying nitrogen oxides comprising:
- reacting the nitrogen oxides, methane and oxygen in the presence of a MOR structure type zeolite which is exchanged with an effective amount of a cation selected from the group consisting of cobalt, nickel, iron, chromium, rhodium and manganese under conditions sufficient to convert the nitrogen oxides to gaseous nitrogen, water and carbon oxides.
A process for destroying nitrogen oxides comprising:
- reacting the nitrogen oxides, methane and oxygen in the presence of a MFI structure type zeolite which is exchanged with an effective amount of a cation selected from the group consisting of cobalt, nickel, iron, chromium, rhodium and manganese under conditions sufficient to convert the nitrogen oxides to gaseous nitrogen, water and carbon oxides.
Dependencies are inferred from the claim text.