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Combination of Mixed Metal Oxides with Cu-Zeolite for Enhanced Soot Oxidation on an SCRoF
Technical Paper
2021-24-0071
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Henry, C., Seuser, G., Kaylor, N., and Henderson, R., "Combination of Mixed Metal Oxides with Cu-Zeolite for Enhanced Soot Oxidation on an SCRoF," SAE Technical Paper 2021-24-0071, 2021, https://doi.org/10.4271/2021-24-0071.Data Sets - Support Documents
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