(121c) Effect of Different Structure Directing Agents on Deactivation of Cu/SAPO-34 during Low-Temperature NH3-SCR
AIChE Annual Meeting
2017
2017 Annual Meeting
Catalysis and Reaction Engineering Division
Applied Environmental Catalysis I
Monday, October 30, 2017 - 1:06pm to 1:24pm
In this study, Cu/SAPO-34 using three different templates, i.e., morpholine(MO), trimethylamine (TEA), and tetraethylammonium hydroxide (TEAOH), as structure directing agent were prepared by incipient wetness impregnation (IWI) method. Characterizations of those catalysts suggest that they have different physical/chemical properties as well as various species of Cu. For example, analysis of H2-TPR profiles of Cu/SAPO-34 catalysts proposed that they contain different amount of Cuspecies depending on the structure directing agents. Those catalysts were systematically investigated for low-temperature NH3-SCR system under water exposure in order to find the correlation of their chemical/physical structures and deactivation. It was observed that the activity of Cu/SAPO-34 declined when they were exposed to water at low temperature as observed in the previous study [2]. Interestingly, deactivation of Cu/SAPO-34 catalysts behave differently depending on the choice of template. Additionally we found that activity of Cu/SAPO-34 using MO as template after water exposure at low temperature declined regardless of a variety of regeneration methods including a dry atmosphere at 600 °C. To conclude, the choice of template over Cu/SAPO-34 catalysts significantly influence their activities and deactivation during low temperature NH3-SCR.
[1] D.W. Fickel, E. DâAddio, J.A. Lauterbach, R.F. Lobo, Appl. Catal. B: Environ. 102 (2011) 441-448
[2] K. Leistner, L. Olsson, Appl. Catal. B: Environ. 165 (2015) 192-199