This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluation of Hydrothermally Aged Vanadia SCR on High-Porosity Substrate
Technical Paper
2016-01-2320
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Ammonia Selective Catalytic Reduction (SCR) is adapted for a variety of applications to control nitrogen oxides (NOx) in diesel engine exhaust. The most commonly used catalyst for SCR in established markets is Cu-Zeolite (CuZ) due to excellent NOx conversion and thermal durability. However, most applications in emerging markets and certain applications in established markets utilize vanadia SCR. The operating temperature is typically maintained below 550°C to avoid vanadium sublimation due to active regeneration of the diesel particulate filter (DPF), or some OEMs may eliminate the DPF because they can achieve particulate matter (PM) standard with engine tuning. Further improvement of vanadia SCR durability and NOx conversion at low exhaust gas temperatures will be required in consideration of future emission standards. A high-porosity substrate (HPS) with increased vanadia catalyst loading is a viable solution to reach higher conversion efficiency targets at low exhaust temperatures (<300°C).
A previous study evaluated HPS of various design configurations with a high vanadia catalyst loading with a gas reactor and an on-highway 7L class engine [1]. The study demonstrated HPS with high vanadia catalyst loading improves NOx conversion and has a potential to be downsized more than 50% when compared to standard substrate with conventional catalyst loading.
This study addresses hydrothermally aged SCR performance of high vanadia catalyst loading on HPS in various design configurations. The catalyzed substrates were hydrothermally aged for 100 hours at 550°C with the engine and evaluated by measuring NH3 storage and performance over steady state conditions and the World Harmonized Transient Cycle (WHTC). For the transient test, 50% volume SCR was also tested to clarify effect of downsizing. The comparison of degreened and aged SCR performance confirms that HPS with high vanadia catalyst loading maintains high NOx conversion activity after 100 hours aging at 550°C even when the volume is cut in half. Also, the best SCR design in terms of tailpipe NOx and N2O emission is discussed in anticipation of tighter NOx and greenhouse gas emission (GHG) regulation.
Recommended Content
Authors
Topic
Citation
Asako, T., Kai, R., Toyoshima, T., Vogt, C. et al., "Evaluation of Hydrothermally Aged Vanadia SCR on High-Porosity Substrate," SAE Technical Paper 2016-01-2320, 2016, https://doi.org/10.4271/2016-01-2320.Also In
References
- Kai , R. , Asako , T. , Toyoshima , T. , Vogt , C. et al. High-Porosity Cordierite Honeycomb Substrate Design Parameter Study in Combination with Vanadia SCR SAE Technical Paper 2016-01-0949 2016 10.4271/2016-01-0949
- Hirata , K. , Masaki , N. , Ueno , H. , and Akagawa , H. Development of Urea-SCR System for Heavy-Duty Commercial Vehicles SAE Technical Paper 2005-01-1860 2005 10.4271/2005-01-1860
- DGMK AdBlue as a Reducing Agent for the Decrease of NOx Emissions from Diesel Engines of Commercial Vehicles Research Report 616-1 DGMK Hamburg, Germany September 2003
- Zybell , J. Technology Trend for Tier4 Integer Diesel Emissions Conference & Diesel Exhaust Fluid USA 2013
- Luo , J. , Yezerets , A. , Henry , C. , Hess , H. et al. Hydrocarbon Poisoning of Cu-Zeolite SCR Catalysts SAE Technical Paper 2012-01-1096 2012 10.4271/2012-01-1096
- Kumar , A. , Kamasamudram , K. , Currier , N. , and Yezerets , A. SCR Architectures for Low N2O Emissions SAE Technical Paper 2015-01-1030 2015 10.4271/2015-01-1030
- Girard , J. , Montreuil , C. , Kim , J. , Cavataio , G. et al. Technical Advantages of Vanadium SCR Systems for Diesel NOx Control in Emerging Markets SAE Int. J. Fuels Lubr. 1 1 488 494 2009 10.4271/2008-01-1029
- EPA Certification of Diesel Engines Equipped with Vanadium-based SCR Catalyst CD-16-19 (HD) https://iaspub.epa.gov/otaqpub/display_file.jsp?docid=36863&flag=1
- Hirose , S. , Yamamoto , H. , Suenobu , H. , Sakamoto , H. et al. Development of High Porosity Cordierite Honeycomb Substrate for SCR Application to Realize High NOx Conversion Efficiency and System Compactness SAE Int. J. Mater. Manf. 7 3 682 687 2014 10.4271/2014-01-1528
- Madia , G. , Koebel , M. , Elsener , M. , Wokaun , A. Side Reactions in the Selective Catalytic Reduction of NOx with Various NO 2 Fractions Ind. & Eng. Chem. Res. 41 16 4008 4015 2002
- Luo , J. , An , H. , Kamasamudram , K. , Currier , N. et al. Impact of Accelerated Hydrothermal Aging on Structure and Performance of Cu-SSZ-13 SCR Catalysts SAE Int. J. Engines 8 3 1181 1186 2015 10.4271/2015-01-1022
- Xi , Y. , A. Ottinger , N. , and Liu , Z. Effect of Hydrothermal Aging on the Catalytic Performance and Morphology of a Vanadia SCR Catalyst SAE Technical Paper 2013-01-1079 2013 10.4271/2013-01-1079
- Blakeman , P. , Arnby , K. , Marsh , P. , Newman , C. et al. Vanadia-Based SCR Systems to Achieve EUIV HDD legislation SAE Technical Paper 2009-26-0013 2009 10.4271/2009-26-0013
- Cavataio , G. , Girard , J. , Patterson , J. , Montreuil , C. et al. Laboratory Testing of Urea-SCR Formulations to Meet Tier 2 Bin 5 Emissions SAE Technical Paper 2007-01-1575 2007 10.4271/2007-01-1575
- Kamasamudram , K. , Henry , C. , Currier , N. , and Yezerets , A. N2O Formation and Mitigation in Diesel Aftertreatment Systems SAE Int. J. Engines 5 2 688 698 2012 10.4271/2012-01-1085