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Impact of Water Vapor on the Performance of a Cu-SSZ-13 Catalyst under Simulated Diesel Exhaust Conditions
ISSN: 2641-9637, e-ISSN: 2641-9645
Published April 06, 2021 by SAE International in United States
Annotation ability available
Event: SAE WCX Digital Summit
Cu-SSZ-13 selective catalytic reduction (SCR) catalysts are broadly applied in diesel aftertreatment systems for the catalytic conversion of oxides of nitrogen (NO + NO2). Diesel exhaust contains a wide range of water vapor concentrations depending on the operating condition. In this study, we evaluate the impact of water vapor on the relevant SCR catalytic functions including NOx conversion, NO oxidation, NH3 oxidation, and N2O formation under both standard and fast SCR conditions. Reactor-based experiments are conducted in the presence and absence of water vapor. Results indicate that water vapor can have both a positive and negative impact on low temperature NOx conversion for standard SCR reaction. At low inlet NOx concentrations, the presence of water vapor has a negative effect on NOx conversion, whereas, at high inlet NO concentrations, water vapor improves NOx conversion. At high temperatures, water vapor has a beneficial effect on NOx conversion at all NOx inlet concentrations evaluated. Experiments under fast SCR conditions reveal that water vapor improves low temperature NOx conversion mainly by minimizing the accumulation of ammonium nitrate, as evidenced with temperature programmed desorption (TPD) results. Furthermore, NO oxidation by ammonium nitrate formed under fast SCR conditions is shown to be significantly faster in the presence of water vapor.
CitationOttinger, N., Xi, Y., Keturakis, C., and Liu, Z., "Impact of Water Vapor on the Performance of a Cu-SSZ-13 Catalyst under Simulated Diesel Exhaust Conditions," SAE Int. J. Adv. & Curr. Prac. in Mobility 3(6):2872-2877, 2021, https://doi.org/10.4271/2021-01-0577.
SAE International Journal of Advances and Current Practices in Mobility
Number: V130-99EJ; Published: 2021-12-10
Number: V130-99EJ; Published: 2021-12-10
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