Method and apparatus for the purifiction of exhaust gas from a compression ignition engine

摘要

A method and apparatus for the removal of NO 2 emission from a lean burn compression ignition engine, wherein NO 2 containing engine exhaust gas is brought in contact with a catalyst being active in the reduction of NO 2 to NO and comprising at least one platinum group metal with the proviso that the platinum metal is not platinum and at least one redox active metal oxide and thereby reducing NO 2 contained in the exhaust gas to NO by reaction with CO, hydrocarbons and/or soot being present in the exhaust gas.