Ammonium Carbamate → Ammonia
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[N:1]#N.N#N.N.N.[C:7](=[O:10])([O-:9])[NH2:8].[NH4+]>N>[C:7](=[O:9])([O-:10])[NH2:8].[NH4+:1].[C:7](=[O:10])=[O:9].[NH3:8][N:1]#N.N#N.N.N.[C:7](=[O:10])([O-:9])[NH2:8].[NH4+]>N>[C:7](=[O:9])([O-:10])[NH2:8].[NH4+:1].[C:7](=[O:10])=[O:9].[NH3:8]SCR catalytic converter 12 situated in exhaust-gas region 11 of internal combustion engine 10 reduces the nitrogen oxides NO and NO2 contained in the exhaust gas of internal combustion engine 10 to nitrogen N2 SCR catalytic converter 12 requires ammonia NH3 for the reduction. The ammonia is prepared in ammonia source 19, which performs a thermal decomposition of ammonium carbamate for example. In the thermolysis of ammonium carbamate in a thermolysis reactor, CO2 is produced in addition to NH3. Only NH3 will be used in the following to designate the product gas stream of ammonia source 19. Another implementation option of ammonia source 19 provides for the ammonia to be desorbed from a storage material (e.g. a metal chloride) while the storage material is being heated. In addition it is possible that ammonia source 19 takes the form of an ammonia synthesis device.
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