Impact of Thermal and Chemical Ageing of Fe-BEA SCR Catalyst on NOx Conversion Performance 2016-01-0946
Emissions of nitrogen oxides (NOx) from heavy-duty diesel engines are subject to more stringent environmental legislation. Selective catalytic reduction (SCR) over metal ion-exchanged zeolites is in this connection an efficient method to reduce NOx. Understanding durability of the SCR catalyst is crucial for correct design of the aftertreatment system. In the present paper, thermal and chemical ageing of Fe-BEA as NH3-SCR catalyst is studied. Experimental results of hydrothermal ageing, and chemical ageing due to phosphorous and potassium exposure are presented. The catalyst is characterized by flow reactor experiments, nitrogen physisorption, DRIFTS, XRD, and XPS. Based on the experimental results, a multisite kinetic model is developed to describe the activity of the fresh Fe-BEA catalyst. Furthermore, the model can predict deactivation of the catalyst well by decreasing the number of active sites, representing loss of active iron sites due to migration or chemical blockage of the sites. By performing a systematic study of different deactivation mechanisms, a deactivation expression for the active sites can be formulated.
Citation: Jansson, J., Shwan, S., and Skoglundh, M., "Impact of Thermal and Chemical Ageing of Fe-BEA SCR Catalyst on NOx Conversion Performance," SAE Int. J. Engines 9(2):1305-1313, 2016, https://doi.org/10.4271/2016-01-0946. Download Citation
Author(s):
Jonas Jansson, Soran Shwan, Magnus Skoglundh
Affiliated:
Volvo Group Trucks Technology, Chalmers University of Technology
Pages: 9
Event:
SAE 2016 World Congress and Exhibition
ISSN:
1946-3936
e-ISSN:
1946-3944
Also in:
SAE International Journal of Engines-V125-3EJ, SAE International Journal of Engines-V125-3
Related Topics:
Selective catalytic reduction
Nitrogen oxides
Diesel / compression ignition engines
Environmental law
Catalysts
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