Process for reducing agent control in an exhaust gas...

Details Process for reducing agent control in an exhaust gas... Process for reducing agent control in an exhaust gas...

2006-11-14

2010-06-08

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S239100, C422S105000, C422S108000, C422S111000, C060S274000, C060S282000, C060S299000, C060S301000, C060S302000

Reexamination Certificate

active

07731925

ABSTRACT:
Methods of reducing agent control in an exhaust gas aftertreatment system of a combustion engine with an exhaust gas pipe in which in the direction of flow of the exhaust gas there is an SCR catalyzer. A reducing agent generating system has an NOxand CO/H2generating unit, an oxidation catalyzer, and a combined NOxstorage/ammonia generating unit in the standard gas path of the reducing agent generating system. Ammonia is introduced as a reducing agent for the reduction of nitric oxides before the SCR catalyzer of the reducing agent generating system. Precursor materials for generation of ammonia are directed at least temporarily to the NOxand CO/H2generating unit through a fuel feed and an air feed. A CO/H2reducing agent stream is temporally modulated during a rich phase. A CO/H2concentration is primarily held constant at a high level.

REFERENCES:
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Werner Weisweiler, “Elimination of Nitrogen Oxides from Oxygen-Containing Automotive Exhaust Gases”, Chemistry Engineer Technology, vol. 72, Issue 5, pp. 441-449, 2000.

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