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Article

The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position

1
Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstr. 18/20, 76131 Karlsruhe, Germany
2
Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Wenpo Shan
Catalysts 2021, 11(3), 336; https://doi.org/10.3390/catal11030336
Received: 6 February 2021 / Revised: 4 March 2021 / Accepted: 5 March 2021 / Published: 6 March 2021
Positioning the catalysts in front of the turbocharger has gained interest over recent years due to the earlier onset temperature and positive effect of elevated pressure. However, several challenges must be overcome, like presence of higher pollutant concentrations due to the absence or insufficient diesel oxidation catalyst volume at this location. In this context, our study reports a systematic investigation on the effect of pressure and various hydrocarbons during selective catalytic reduction (SCR) of NOx with NH3 over the zeolite-based catalysts Fe-ZSM-5 and Cu-SSZ-13. Using a high-pressure catalyst test bench, the catalytic activity of both zeolite catalysts was measured in the presence and absence of a variety of hydrocarbons under pressures and temperatures resembling the conditions upstream of the turbocharger. The results obtained showed that the hydrocarbons are incompletely converted over both catalysts, resulting in numerous byproducts. The emission of hydrogen cyanide seems to be particularly problematic. Although the increase in pressure was able to improve the oxidation of hydrocarbons and significantly reduce the formation of HCN, sufficiently low emissions could only be achieved at high temperatures. Regarding the NOx conversion, a boost in activity was obtained by increasing the pressure compared to atmospheric reaction conditions, which compensated the negative effect of hydrocarbons on the SCR activity. View Full-Text
Keywords: pre-turbo; selective catalytic reduction; NOx removal; zeolites; pressure; hydrocarbons pre-turbo; selective catalytic reduction; NOx removal; zeolites; pressure; hydrocarbons
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MDPI and ACS Style

Zengel, D.; Barth, S.; Casapu, M.; Grunwaldt, J.-D. The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position. Catalysts 2021, 11, 336. https://doi.org/10.3390/catal11030336

AMA Style

Zengel D, Barth S, Casapu M, Grunwaldt J-D. The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position. Catalysts. 2021; 11(3):336. https://doi.org/10.3390/catal11030336

Chicago/Turabian Style

Zengel, Deniz, Simon Barth, Maria Casapu, and Jan-Dierk Grunwaldt. 2021. "The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position" Catalysts 11, no. 3: 336. https://doi.org/10.3390/catal11030336

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