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Prompt:  2s 1. A method for exhaust gas post treatment, containing the following steps: a) providing a nitrogen oxide-containing raw exhaust gas, b) introducing the nitrogen oxide-containing raw exhaust gas into a catalytic evaporator (1), c) introducing a fuel into the catalytic evaporator (1) so as to obtain a converted fuel, wherein said converted fuel comprises H2, CO, and hydrocarbons having 1 to 10 C atoms, and wherein a major part of said hydrocarbons of said converted fuel comprises hydrocarbons having 1 to 5 C atoms, d) mixing urea with the converted fuel, and e) supplying the mixture obtained according to step d) to an exhaust gas post treatment system (8). an oxidant is introduced into the catalytic evaporator (1) in step c). the exhaust gas post treatment system (8) comprises a device for hydrolysis (81) and a device for the selective catalytic reduction (82). the urea is used in the form of a urea solution. the mixing of the urea with the evaporated fuel is carried out upstream of or in a part of the exhaust gas system (9). the mixture from step d) is supplied to the device for hydrolysis (81) and the subsequently obtained product is supplied to the device for the selective catalytic reduction (82). in that the exhaust gas post treatment can be operated at a temperature of about 170°C or higher. 9. A device for exhaust gas post treatment, containing: a catalytic evaporator (1), a raw exhaust gas supply line (2) to the catalytic evaporator (1), adapted to introduce nitrogen oxide-containing raw exhaust gas into the catalytic evaporator (1), a fuel supply line (3) to the catalytic evaporator (1), adapted to introduce fuel into the catalytic evaporator (1), a discharge line (7) from the catalytic evaporator (1), adapted to discharge the evaporated fuel from the catalytic evaporator (1), and an exhaust gas post treatment system (8). containing a urea reservoir (5) and a urea supply line (6), which is connected to a spa