| abstract |
The invention relates to a method and a device for the aftertreatment of an exhaust gas of a spark ignition internal combustion engine (10). DOLLAR A It is provided that the exhaust gas is passed through a catalyst system (16, 18) connected downstream of the internal combustion engine (10), at least consisting of a pre-catalyst (16) close to the engine, and the pre-catalyst (16) has a displacement-related precious metal content (EM¶VH¶ ) of at most 1.1 g per dm · 3 · (31 G / ft · 3 ·) stroke volume of the internal combustion engine (10) and after a cold start of the internal combustion engine (10) at least one heating measure is carried out at least temporarily, such that a catalyst temperature (T¶VK¶) of the pre-catalytic converter (16) not later than 25 seconds after starting the engine at a maximum engine speed of 2500 min · -1 · to be exceeded for at most one second, at least 150 ° C. |