Patent ID: 7661265

Claim:
An exhaust gas system for an internal combustion engine, comprising: a first exhaust gas manifold section ( 3 ), wherein exhaust gas outlets ( 2 ) of a first portion of the cylinders of the engine communicate with said first exhaust gas manifold section ( 3 ); a second exhaust gas manifold section ( 4 ), wherein exhaust gas outlets ( 2 ) of a remaining portion of the cylinders of the engine communicate with said second exhaust gas manifold section ( 4 ); an oxidation catalytic converter ( 7 ) disposed in said first exhaust gas manifold section ( 3 ), wherein nitric oxide contained in exhaust gas that flows through is adapted to be converted via said oxidation catalytic converter ( 7 ) into nitrogen dioxide; a hydrolysis catalytic converter ( 8 ) disposed in said second exhaust gas manifold section ( 4 ), wherein said oxidation catalytic converter ( 7 ) surrounds said hydrolysis catalytic converter ( 8 ) in an annular manner, and wherein downstream of said oxidation catalytic converter ( 7 ) and said hydrolysis catalytic converter ( 8 ) said first and second exhaust gas manifold sections ( 3 , 4 ) discharge into a common main exhaust gas manifold ( 9 ); at least one further catalytic converter ( 10 , 10 a , 10 b , 10 c ) disposed in said main exhaust gas manifold ( 9 ); a housing ( 11 ), wherein said catalytic converter and said hydrolysis catalytic converter ( 8 ) are installed in said housing, wherein said second exhaust gas manifold section ( 4 ) is provided with a tubular portion ( 4 a ) that extends into said housing ( 11 ), wherein said tubular portion ( 4 a ) has an end portion ( 4 a ′) that accommodates said hydrolysis catalytic converter ( 8 ), wherein said first exhaust gas manifold section ( 3 ) is provided with a tubular portion ( 3 a ) that extends about, and is spaced from, said tubular portion ( 4 a ) of said second exhaust gas manifold section ( 4 ) to form an annular in-low chamber ( 12 ) for said oxidation catalytic converter ( 7 ), and wherein said annular in-flow chamber ( 12 ) simultaneously serves as a heating chamber; and a nozzle ( 13 ) for introducing a reduction agent into said tubular portion ( 4 a ) of said second exhaust gas manifold section ( 4 ) upstream of said hydrolysis catalytic converter ( 8 ), wherein ammonia is adapted to be produced from said reduction agent via said hydrolysis catalytic converter ( 8 ).