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Combination of Mixed Metal Oxides with Cu-Zeolite for Enhanced Soot Oxidation on an SCRoF
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 05, 2021 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
A push for more stringent emissions regulations has resulted in larger, increasingly complex aftertreatment solutions. In particular, oxides of nitrogen (NOX) and particulate matter (PM) have been controlled using two separate systems, selective catalytic reduction (SCR) and the catalyze diesel particulate filter (CDPF), or the functionality has been combined into a single device producing the SCR on filter (SCRoF). The SCRoF forgoes beneficial NO2 production present in the CDPF to avoid NH3 oxidation which occurs when using platinum group metals (PGM) for oxidation. In this study, mixed-metal oxides are shown to oxidize NO to NO2 without appreciable NH3 oxidation. This selectivity leads to enhanced performance when combined with a typical Cu-zeolite catalyst. Ce was co-precipitated with Zr, La, Sn and Pr at different ratios and doped with Cu or Fe. 0.5% Fe on Ce0.8Zr0.2OX and Ce0.75Pr0.25OX oxidized 30% of incoming NO at 350 °C while oxidizing < 5% of the NH3 in a synthetic exhaust environment, demonstrating possible formulations that allow enhanced NO2 derived soot oxidation compatible with an SCRoF. The selected formulations were washcoated onto state-of-the-art filter substrates and soot loaded using a realistic burner-based method to achieve representative soot-catalyst contacting within the filter. When combined with a typical Cu-zeolite catalyst, the mixed metal oxides increased both soot oxidation and NOX conversion relative to a standard SCRoF. The catalyst samples were characterized by x-ray diffraction, surface area measurements, x-ray fluorescence and scanning electron microscopy with energy dispersive X-ray spectroscopy.
Data Sets - Support Documents
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- Niessner , R. Angew. Chem., Int. Ed. 53 2014 12366 12379
- Labhsetwar , N. , Megarajan , S.K. , Rayalu , S. , and Nishibori , M. ACS Catal. 5 2015 301 309
- Premchand , K. , Johnson , J. , and Yang , S. Development of a 1-D Catalyzed Diesel Particulate Filter Model for Simulation of the Oxidation of Particulate Matter and Gaseous Species During Passive Oxidation and Active Regeneration SAE Technical Paper 2013-01-1574 2013 https://doi.org/10.4271/2013-01-1574
- Abdalla , A. , Wang , G. , Zhang , J. , and Shuai , S. Simulation of Catalyzed Diesel Particulate Filter for Active Regeneration Process Using Secondary Fuel Injection SAE Technical Paper 2017-01-2287 2017 https://doi.org/10.4271/2017-01-2287
- Olowojebutu , S. and Steffen , T. A Review of the Literature on Modelling of Integrated SCR-in-DPF Systems SAE Technical Paper 2017-01-0976 2017 https://doi.org/10.4271/2017-01-0976
- Bueno-Lopez , A.
- Murakami , Y. , Kosaki , Y. , Motokawa , M. , and Ooyabu , Y. Oxidation of Ammonia on Metal Oxides J. Stage, Vol 5 1977 612 618
- Neyertz , C.A. , Banús , E.D. , Miró , E.E. , and Querini , C.A. Chem.Eng. J. 248 2014 394 405
- Atribak , I. , Buenolopez , A. , and Garciagarcia , A.J. Catal. 259 2008 123 132
- Cheng , Y. , Song , W. , Liu , J. , Zheng , H. et al. ACS Catalysis 7 6 2017 3883 3892
- Andana , T. , Rappe , K. , Gao , F. , and Wang , Y. Identification of the Roles of Metal Oxide Xomponent of Combined Metal Oxide-Ssz-13 Catalyst in Improving Low-Temperature Selective Catalytic Reduction of NO X by Ammonia Poster presented at: CLEERS Virtual Workshop 2020 9 14
- Andana , T. , Rappé , K.G. , Gao , F. , Szanyi , J. et al. Recent Advances in Hybrid Metal Oxide-Zeolite Catalysts for Low-Temperature Selective Catalytic Reduction of NOx by Ammonia Applied Catalysis B: Environmental 291 2021 120054
- Fickel , D.W. , D’Addio , E. , Lauterbach , J.A. , and Lobo , R.F. The Ammonia Selective Catalytic Reduction Activity of Copper-Exchanged Small-Pore Zeolites Applied Catalysis B: Environmental 102 3 2011 441 448