| abstract |
The present invention relates to a purification apparatus (1) for exhaust gas (2) of an internal combustion engine, comprising at least one supply line (4) for providing an aqueous solution, and a hydrolysis catalyst (5) connected to the supply line (4). , And SCR catalyst 7. The SCR catalyst 7 can flow by the exhaust gas 2. The invention is characterized in that at least one rod-shaped heating element 9 capable of heating at least part of a) the supply line 4 and b) at least one of the hydrolysis catalysts is provided. The apparatus 1 of the present invention is capable of evaporating an aqueous solution comprising urea, and thereafter, as well as the corresponding hydrolysis catalyst 5, which can be hydrolyzed to form a gas flow 22 containing ammonia, It is possible for the supply line 4 to be heated by the rod-like element 9 to be formed compactly. The gas flow 22 is used as a reducing agent in the SCR process. The compact configuration allows installation in limited space available. Due to the fact that the hydrolysis catalyst 5 does not flow by the exhaust gas, the volume of the hydrolysis catalyst 5 can be clearly reduced, so that a clearly smaller flow rate is hydrolyzed to the gas. |