caa a22 4500 606173595 CHVBK 20210128100734.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0470-1 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0470-1 NH3-SCR Activity of H-BEA and Fe-BEA After Potassium Exposure [Elektronische Daten] [Soran Shwan, Jonas Jansson, Louise Olsson, Magnus Skoglundh] A previous developed multisite microkinetic model for hydrothermally deactivated H-BEA and Fe-BEA catalyst used for NH3-SCR applications has been applied and validated using potassium exposed H-BEA and Fe-BEA samples. The catalysts have been exposed to evaporated aqueous solution of potassium (10ppm KNO3) in a flow-reactor for 14-48h. The results for the H-BEA samples show an increase in NH3-SCR activity after 48h of potassium exposure. This is correlated to an increase in NOX storage capacity, indicating that potassium forms new NOX storage sites participating in the SCR reaction. However, the Fe-BEA samples show different results. The SCR activity for the Fe-BEA catalyst decreases significantly after 14h of exposure to potassium and after longer exposure time the activity slightly increases again compared to the sample exposed to potassium for 14h. When applying the kinetic model to the flow-reactor measurements the model is able to predict the changes in SCR activity well when changing the site density of the active sites. In overall, combining the experimental results with the simulation indicates that exposure to potassium initially chemically blocks the active iron species which decrease with exposure time. Longer time of exposure to potassium indicates that the iron species are exchanged and lost due to formation of new potassium sites in the zeolite resulting in an overall lower SCR activity compared to a fresh Fe-BEA sample. Springer Science+Business Media New York, 2015 Kinetic modeling nationallicence Potassium nationallicence Fe-BEA nationallicence Deactivation nationallicence Poisoning nationallicence NH3-SCR nationallicence Shwan Soran Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Jansson Jonas Volvo Group Trucks Technology, 40508, Göteborg, Sweden aut Olsson Louise Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Skoglundh Magnus Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1012-1018 1022-5528 58:14-17<1012 2015 58 11244 https://doi.org/10.1007/s11244-015-0470-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0470-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shwan Soran Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 700 1- Jansson Jonas Volvo Group Trucks Technology, 40508, Göteborg, Sweden aut NATIONALLICENCE 700 1- Olsson Louise Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 700 1- Skoglundh Magnus Competence Centre for Catalysis and Department of Applied Surface Chemistry, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1012-1018 1022-5528 58:14-17<1012 2015 58 11244