Kinetic Modeling of Ammonia SCR for Cu-Zeolite Catalysts

An important group of catalysts for NOx reduction through anunonia SCR is represented by copper exchanged zeolites [1-9]. Many different zeolites have been investigated, for example, Cu-ZSM-5 [10-13], Cu-faujasite [14], Cu-Beta [15,16], and Cu-Y [17]. Recently, copper zeolites with chabazite (CHA) structure have received great attention due to their high thermal stability and hydro carbon resistance [18]. Both Cu-SAPO-34 [19] and Cu-SSZ-13 [18] have a CHA structure 

Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden e-mail louise.olsson chalmers.se 

Nova and E. Tronconi (eds.), Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts, Fundamental and Applied Catalysis, 

However, if the NO2 to NOx ratio is high, the slow NO2 SCR reaction occurs while the amount of N2O produced is also increased  

4NH3 + 3NO2 3.5N2 + 6H2O 2NH3 + 2NO2 N2 + N2O + 3H2O 

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