An exhaust gas purification apparatus of an internal combustion engine includes: an NH 3 generating catalyst which generates NH 3 from NOx and H 2 at a rich air-fuel ratio; an in-cylinder injection valve which injects fuel into a cylinder; and a control ap...

An apparatus for detecting urea deposits in an exhaust pipe (12) of an internal combustion engine (10) is provided, where the urea is introduced into the exhaust pipe (12) in an aqueous urea solution via a nozzle (18). The apparatus comprises at least one ...

A previous-stage oxidation catalyst device (21), a DPF device (22), a turbine (14) of a turbocharger, a previous-stage NOx selective reduction catalyst device (23), and a subsequent-stage NOx selective reduction catalyst device (24) are disposed in the exh...

In an internal combustion engine, inside an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The carrier (50) of the exhaust purification catalyst (13) is formed from a crystallized composite oxi...

Exhaust gas post treatment unit (2) comprises a nitrogen oxide storage catalyst (7) and an SCR catalyst (8). In a desulfurizing operating mode of the internal combustion (I.C.) engine with a reducing exhaust gas composition, the exhaust gas leaving the nit...