B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/94 (2006.01) B01D 53/90 (2006.01) F01N 3/20 (2006.01)
Patent
CA 2672857
The invention relates to the use of aqueous guanidinium formiate solutions, optionally combined with urea and/or ammonia and/or ammonium salts, for the selective catalytic reduction of nitrogen oxides using ammonia in exhaust gases of vehicles. The inventive guanidinium formiate solutions enable a reduction of the nitrogen oxides by appoximately 90 %. Furthermore, said guanidinium formiate solutions can enable an increase in the ammonia forming potential from 0.2 kg, corresponding to prior art, up to 0.4 kg ammonia per litre of guanidinium formiate, along with freezing resistance (freezing point below -25°C). The risk of corrosion of the inventive guanidinium formiate solutions is also significantly reduced compared to that of solutions containing ammonium formiate.
L'invention concerne l'utilisation de solutions aqueuses de formiate de guanidinium, éventuellement combinées à de l'urée et/ou de l'ammoniac et/ou des sels d'ammonium, pour la réduction par catalyse sélective avec de l'ammoniac d'oxydes d'azote dans les gaz d'échappement de véhicules à moteur. Les solutions de formiate de guanidinium de l'invention permettent de réduire les oxydes d'azote d'environ 90%, et, en outre, d'augmenter le potentiel de formation d'ammoniac de 0,2 kg, selon l'état de la technique actuelle, jusqu'à 0,4 kg d'ammoniac par litre de formiate de guanidinium, avec résistance au gel simultanée (point de congélation inférieur à -25°C). Enfin, le risque de corrosion des solutions de formiate de guanidinium de l'invention est sensiblement réduit par rapport à des solutions de formiate d'ammonium.
Hammer Benedikt
Jacob Eberhard
Krimmer Hans-Peter
Schulz Bernd
Alzchem Trostberg Gmbh
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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