Potentialities and limitations of lean de-NOx catalysts in reducing automotive exhaust emissions

Abstract The performance of Pt–γ-Al 2 O 3 and CuZSM5 de-NO x catalysts was evaluated at the exhaust of a lean-burn gasoline engine. It is shown that durability for zeolite catalysts and N 2 O formation for Pt catalysts are the main limitations which have to be still overcome to successfully apply the lean de-NO x technology.