US Patent 10934919 Exhaust system

An exhaust system for an internal combustion engine, especially in a vehicle, includes an exhaust gas flow duct (14), a reactant release device (20) for the release of reactant (R) into the exhaust gas flow duct (14) and a catalytic converter device (16) downstream of the reactant release device (20). At least one part of a component surface is provided by a hydrophilic material (34) of at least one exhaust gas-carrying component (12, 22) positioned in the reactant flow path or/and defining this reactant flow path, or/and at least one part of the component surface is provided by a hydrophobic material (40) of at least one exhaust gas-carrying component (12, 18, 22) positioned in the reactant flow path.