Reduction of N2O emissions

Details Reduction of N2O emissions Reduction of N2O emissions

2005-03-29

2005-03-29

Bos, Steven (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C502S326000

Reexamination Certificate

active

06872372

ABSTRACT:
A method for the selective catalyst reduction of nitrous oxide (N2O) in the presence of a solid catalyst, with the addition of a saturated hydrocarbon as reducing agent. The catalyst used is a promoted, iron-containing zeolite. As a result, it is possible to increase the conversion of (N2O) compared to unpromoted iron-containing zeolite catalysts. The promoted catalyst is active at temperatures below 350° C. Furthermore, it has been found that the iron-containing zeolite catalysts which are promoted with precious metal also give low emissions of CO and residual hydrocarbons. The catalyst is also very active under high process pressures and in the presence of sulphur.

REFERENCES:
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patent: 41 28 629 (1993-03-01), None
patent: WO 9949954 (1999-10-01), None
M. Kögel et al., “Simultaneous Catalytic Reduction of NO and N2O Using Fe-MFI Prepared by Solid-State Ion Exchange,” Catalysis Letters, V. 51, 1998, pp. 23-25.

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