Catalyst recovery method

Details Catalyst recovery method Catalyst recovery method

2004-10-21

2008-11-25

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S285000, C060S301000

Reexamination Certificate

active

07454900

ABSTRACT:
A catalyst recovery method is capable of maintaining NOx purification performance by efficiently releasing SOx occluded in a NOx catalyst in an exhaust system of an internal combustion engine. The air fuel ratio of exhaust gas in a fuel supply period (Δt1) is made further richer (C2) than a predetermined rich air fuel ratio (C0) with increasing length of a set stop period (Δt2). Provided within a stop period (Δt2) is an excessively lean period (Δt3) in which the air fuel ratio of the exhaust gas becomes higher (C3) with increasing length of the stop period (Δt2), whereby an amount of reducing agent to be added is increased, thus making it possible to ensure a sufficient amount of SOx released from the NOx catalyst. As a result, the length of the stop period (Δt2′) is shortened, so the SOx occluded in the NOx catalyst can be efficiently released.

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