Ab Volvo

Volvo Technology Corporation

Goran Wirmark

Edward Jobson

Lennart Cider

Method and device for reduction of a gas component in an exhaust gas flow of a combustion engine () that is adapted for operation by a lean air/fuel mixture. An exhaust pipe () is included for transport of the exhaust gas flow from the engine (). A separation unit () is also included that is arranged along the exhaust pipe (), which separation unit () has a wall structure () of a material which provides separation of the gas component from the exhaust gas flow by means of a selective passage of the gas component before other gas components in the exhaust gas flow. The method provides for a reduction and a separation unit that is intended to be utilized during such a reduction. An improved reduction of in particular NOcompounds from a so-called 'lean-burn' engine is also provided.

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Göteborg, Sweden

Goran Wirmark