This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of Ultra-Stable Cu-SCR Aftertreatment System for Advanced Lean NOx Control
Technical Paper
2019-01-0743
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The integration of SCR catalyst into diesel-particulate filter (SDPF) may be one of most viable ways to meet upcoming stringent emission regulations with new test protocols such as Worldwide harmonized Light vehicles Test Cycles (WLTC) and Real Driving Emissions (RDE) requirements. The chabazite-structured SSZ-13-based catalysts enabled the wide implementation of urea-SCR technology for mobile applications due to their robust thermal stability up to 750°C compared to the thermally unstable ZSM-5-based technologies. However, the thermally stable Cu-SSZ-13 catalyst starts losing its initial activity with the increase of aging time at 850°C, where the SCR catalyst on SDPF can possibly be exposed during filter regeneration under a drop-to-idle (DTI) condition. Therefore, more durable SCR catalysts that survive under higher temperatures have been strongly desired in automotive industry. Recently, we found Cu-exchanged high silica LTA revealed an excellent hydrothermal stability. In this study, our work successfully demonstrated the hydrothermally ultra-stable Cu/LTA catalyst that can potentially become a good candidate for the next generation SDPF application that enables tighter real-world driving emission requirement. After hydrothermal aging at 900°C for 12h, the NOx reduction over the Cu/LTA catalyst is superior to those of the state-of-the-art Cu/SSZ-13 based commercial catalyst in the entire reaction temperature. Furthermore, the Cu/LTA catalyst can maintain remarkable high-temperature NOx conversion after lean/rich cyclic aging at 620°C, due to the low oxidation of NH3 to NO. More stable NH3 storage capacity of Cu/LTA upon hydrothermal aging compared to the case for Cu/SSZ-13 will provide an additional benefit in integrating the on-board urea dosing control for the maximum system performance. Finally, the performance of the Cu/LTA catalyst under the simulated dynamic WLTC mode test will be presented. We believe that these enhanced features will help improving the future lean NOx aftertreatment systems under the real-world driving conditions.
Recommended Content
Authors
Topic
Citation
Kim, P., Kim, Y., and Kim, C., "Development of Ultra-Stable Cu-SCR Aftertreatment System for Advanced Lean NOx Control," SAE Technical Paper 2019-01-0743, 2019, https://doi.org/10.4271/2019-01-0743.Also In
References
- Kim , C.H. , Qi , G. , Dahlberg , K. , and Li , W. Strontium-Doped Perovskites Rival Platinum Catalysts for Treating NOx in Simulated Diesel Exhaust Science 327 1624 1627 2010
- Wang , J. , Zhao , H. , Haller , G. , and Li , Y. Appl. Catal. B 202 346 354 2017
- Marchitti , F. , Nova , I. , and Tronconi , E. Experimental Study of the Interaction Between Soot Combustion and NH 3 -SCR Reactivity Over a Cu-Zeolite SDPF Catalyst Catal. Today 267 110 118 2016
- Kim , Y.J. , Lee , J.K. , Min , K.M. , Hong , S.B. et al. Hydrothermal Stability of CuSSZ13 for Reducing NOx by NH 3 J. Catal. 311 447 457 2014
- Jin , Y. , Shinoda , N. , Uesaka , Y. , Kuki , T. et al. Development of New High Porosity Diesel Particulate Filter for Integrated SCR Technology/Catalyst SAE Int. J. Fuels Lubr. 8 2 494 500 2015 10.4271/2015-01-1017
- Seo , J.-M. , Park , J.-W. , Lee , J.-H. , Lim , S. , Joo , K.-H. , Kim , S.-J. , Schaub , J. , Wittka , T. , Vovk , A. , and Holderbaum , B. Fulfilment of Most Stringent EU Emission Limits by Combining NOx Storage Catalyst and SCR System in the Diesel Passenger Car 24th Aachen Colloquium Automobile and Engine Technology 2015
- Cheng , Y. and Huang , Y. Deactivation of Cu/Zeolite SCR Catalyst Under Lean-Rich Aging Conditions SAE Technical Paper 2010-01-1180 2010 10.4271/2010-01-1180
- Jo , D. , Ryu , T. , Park , G.T. , Kim , P.S. et al. Synthesis of High-Silica LTA and UFI Zeolites and NH 3 -SCR Performance of Their Copper-Exchanged Form ACS Catal. 6 2443 2447 2016
- Schmieg , S.J. , Oh , S.H. , Kim , C.H. , Brown , D.B. et al. Thermal Durability of Cu-CHA NH 3 -SCR Catalysts for Diesel NOx Reduction Catal. Today 184 252 261 2012
- Ryu , T. , Ahn , N.H. , Seo , S. , Cho , J. et al. Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH 3 -SCR Catalysts Angew. Chem. Int. Ed. 56 1 6 2017
- Yoon , D.Y. , Lim , E. , Kim , Y.J. , Kim , J.H. et al. NO Oxidation Activity of Ag-Doped Perovskite Catalysts J. Catal. 319 182 193 2014
- Kamasamudram , K. , Currier , N.W. , Chen , X. , and Yezerets , A. Overview of the Practically Important Behaviors of Zeolite-Based Urea-SCR Catalysts, Using Compact Experimental Protocol Catal. Today 151 212 222 2010
- Rauch , D. , Kubinski , D. , Simon , U. , and Moos , R. Detection of the Ammonia Loading of a Cu Chabazite SCR Catalyst by a Radio Frequency-Based Method Sens. Actuators B 205 88 93 2014
- Luo , J. , Gao , F. , Kamasamudram , K. , Currier , N. et al. New Insights into Cu/SSZ-13 SCR Catalyst Acidity. Part I: Nature of Acidic Sites Probed by NH 3 Titration J. Catal. 348 291 299 2017
- Valdez Lancinha Pereira , M. , Nicolle , A. , and Berthout , D. Hydrothermal Aging Effects on Cu-Zeolite NH 3 -SCR Catalyst Catal. Today 258 424 431 2015
- Yu , T. , Xu , M. , Huang , Y. , Wang , J. et al. Insight of Platinum Poisoning Cu/SAPO-34 During NH 3 -SCR and Its Promotion on Catalysts Regeneration after Hydrothermal Treatment Appl. Catal. B 204 525 536 2017
- Schiavoni , M. , Campisi , S. , and Gervasini , A. Effect of Cu Deposition Method on Silico Aluminophosphate Catalysts in NH 3 -SCR and NH 3 -SCO Reactions Appl. Catal. A 543 162 172 2017
- Jabłońska , M. , Nocuń , M. , Gołąbek , K. , and Palkovits , R. Effect of Preparation Procedures on Catalytic Activity and Selectivity of Copper-Based Mixed Oxides in Selective Catalytic Oxidation of Ammonia into Nitrogen and Water vapour Appl. Surf. Sci. 423 498 508 2017
- Lee , J.H. , Kim , Y.J. , Ryu , T. , Kim , P.S. et al. Synthesis of Zeolite UZM-35 and Catalytic Properties of Copper-Exchanged UZM-35 for Ammonia Selective Catalytic Reduction Appl. Catal. B 200 428 438 2017
- Gao , F. , Wang , Y. , Washton , N.M. , Kollár , M. et al. Effects of Alkali and Alkaline Earth Cocations on the Activity and Hydrothermal Stability of Cu/SSZ-13 NH 3 -SCR Catalysts ACS Catal. 5 6780 6791 2015
- Bulánek , R. , Wichterlová , B. , Sobalík , Z. , and Tichý , J. Reducibility and Oxidation Activity of Cu ions in Zeolites: Effect of Cu ion Coordination and Zeolite Framework Composition Appl. Catal. B 31 13 25 2001
- Sultana , A. , Nanba , T. , Haneda , M. , Sasaki , M. , and Hamada , H. Influence of Co-Cations on the Formation of Cu + Species in Cu/ZSM-5 and Its Effect on Selective Catalytic Reduction of NOx with NH 3 Appl. Catal. B 101 61 67 2010
- Chen , H.-Y. , Wei , Z. , Kollar , M. , Gao , F. et al. NO Oxidation on Zeolite Supported Cu Catalysts: Formation and Reactivity of Surface Nitrates Catal. Today 267 17 27 2016
- Ciardelli , C. , Nova , I. , Tronconi , E. , Chatterjee , D. et al. Reactivity of NO/NO 2 -NH 3 SCR System for Diesel Exhaust Aftertreatment: Identification of the Reaction Network as a Function of Temperature and NO 2 Feed Content Appl. Catal. B 70 80 90 2007