Egr urea hydrolysis

Abstract

An exhaust system for an internal combustion engine, comprising an exhaust gas recirculation (EGR) circuit for connecting an exhaust stream to an intake of the engine, wherein the EGR circuit comprises a heat exchanger and the heat exchanger includes a surface comprising a urea hydrolysis catalyst; and a urea injector for providing urea to the surface of the heat exchanger coated with the urea hydrolysis catalyst, and means for introducing resulting ammonia to the exhaust stream.

Dependencies are inferred from the claim text.