Bypass controlled regeneration of NOx adsorbers
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[0090] A method of regenerating a NOx adsorber that is used to treat exhaust gases created during combustion in the combustion chamber is disclosed. A hydrocarbon, preferably methane, is introduced into the exhaust line wherein the hydrocarbon is oxidized and reformed within the exhaust line to generate hydrogen, which is used to regenerate the NOx absorber. CO, as well as hydrogen, is generated during reformation of methane resulting in a regeneration mixture that includes both hydrogen and CO. The aftertreatment system is capable of directing an amount of exhaust gas to by-pass the NOx adsorber during regeneration for the purposes of reducing regeneration flow, hydrocarbon consumption, emissions, and regeneration time. Specific markers, indicative of the properties of the exhaust gas, can be used to identify completion of regeneration.
[0091]FIG. 1 is a schematic showing an aftertreatment system according to a preferred embodiment of the invention. An exhaust line 22 carries exha...
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