Diesel after-treatment technologies and their problems

摘要

Social concerns for the reduction of exhaust emissions from diesel vehicles are increasing rapidly, and modern after-treatment technologies are expected to play a dominant role in the reduction. Outline and operating principle of these technologies such as oxidation catalysts, diesel particulate filters (DPFs) and nitrogen-oxide (NO{sub}x) reduction catalysts are shown. Among these, continuously regenerating DPF and NO{sub}x storage-reduction catalyst are focused.