Denitration device for exhaust gases of internal combustion motors.

摘要

Conventional devices for the denitration of the exhaust gases of an internal combustion engine (4) which operate according to the principle of the selective catalytic reduction provide a reservoir (14), carried along in the vehicle, for, for example, an aqueous urea solution (16). The ammonia forming in the reservoir during heating of the aqueous urea solution is conventionally discharged to the surroundings for the pressure relief of the reservoir. This liberation of the ammonia is disadvantageous since ammonia is toxic and, even in low concentrations, represents odour pollution for people. For this, according to the invention it is proposed to connect to the reservoir a pressure-relief line (18) via which excess ammonia can be fed to the DeNOx catalyst (8) and is joined to the catalytic material. The invention can be installed in principle in any device for denitration of the exhaust gases of an internal combustion engine.