Abstract
Automotive emission control through modern engine design and active exhaust gas aftertreatment has reached a very high technological level. This led to a considerable decrease of exhaust emissions from automobiles in the last years, despite continuous increase of vehicle numbers and kilometres travelled. Nevertheless, a number of challenges for scientists and engineers remain, to develop further improved catalyst materials and exhaust aftertreatment systems. The paper describes the state of the art of exhaust aftertreatment and the major technological paths that will be followed in further development. It concentrates mainly on aftertreatment systems to achieve near zero emissions for vehicles in especially emissions sensitive regions and on exhaust aftertreatment technologies for lean burn engines, with a special emphasis on nitrogen oxides and particulates. These engines and therefore these aftertreatment systems will be mandatory to fulfil the requirements on CO2 reduction.
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