초록

A NO x adsorber is protected from sulfur poisoning by introducing fuel to the NO x adsorber prior to a sulfur trap and/or particulate trap regeneration stream entering the NO x adsorber. The fuel establishes a rich environment, thereby inhibiting sulfur adsorption in the NO x adsorber.

대표청구항 ▼

1. A method for regenerating a sulfur trap in an exhaust system having the sulfur trap disposed upstream of a NO x adsorber, comprising:introducing at least a portion of a fuel rich exhaust stream to the sulfur trap;removing sulfur species from the sulfur trap to form a sulfur exhaust stream;passin

1. A method for regenerating a sulfur trap in an exhaust system having the sulfur trap disposed upstream of a NO x adsorber, comprising:introducing at least a portion of a fuel rich exhaust stream to the sulfur trap;removing sulfur species from the sulfur trap to form a sulfur exhaust stream;passing the sulfur exhaust stream through a particulate trap, disposed upstream of the NO x adsorber;introducing fuel to the NO x adsorber to form a fueled adsorber; anddirecting the sulfur exhaust stream through the fueled adsorber. 2. The method for regenerating a sulfur trap as in claim 1, further comprising regenerating the particulate trap. 3. The method for regenerating a sulfur trap as in claim 2, wherein introducing fuel to the NO x adsorber occurs during the regenerating of the particulate trap. 4. The method for regenerating a sulfur trap as in claim 1, wherein the sulfur trap is disposed in a close-coupled position relative to an internal combustion engine. 5. An exhaust gas system, comprising:a sulfur trap disposed within an exhaust stream, the sulfur trap comprising a sulfur scavenger component;a NO x adsorber disposed within the exhaust stream, downstream from the sulfur trap;a fuel introduction point between the NO x adsorber and the sulfur trap; anda particulate trap disposed upstream of the fuel introduction point. 6. The exhaust gas system of claim 5, further comprising a three-way catalyst positioned downstream of the NO x adsorber or in the NO x adsorber. 7. The exhaust gas system of claim 5, wherein the particulate trap is housed in an underfloor position, downstream of the sulfur trap. 8. The exhaust gas system of claim 7, wherein the particulate trap is housed in an underfloor position, upstream of the NO x adsorber.