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Use of aqueous solutions containing guanidinium formate as ammonia precursors for selective catalytic reduction of nitrogen oxides in exhaust gas
Use of aqueous solutions containing guanidinium formate as ammonia precursors for selective catalytic reduction of nitrogen oxides in exhaust gas
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机译:含有甲酸胍盐作为氨前体的水溶液用于选择性催化还原废气中氮氧化物的用途
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摘要
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 approximately 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 liter 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.
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