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Reaction analysis and modeling of Fast SCR in a Cu-chabazite SCR catalyst considering generation and decomposition of ammonium nitrate Waseda University
- Format:
- Book
- Conference/Event
- Author/Creator:
- Seki, Keiichirō, author.
- Conference Name:
- 15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- In this study, reaction path analysis and modeling of NOxreduction phenomena by fast SCR reaction on a Cu-chabazite catalystwere conducted considering the formation and decomposition ofammonium nitrate (NH4NO3). White crystals of NH4NO3 decompose attemperatures <200 °C. Thus, the reaction behavior changes at200 °C under fast SCR reaction conditions. NH4NO3 formation canoccur on both Cu sites and Brønsted acid sites, which are activesites for NOx reduction in the Cu-chabazite catalyst, but it isunclear where NH4NO3 accumulates on the catalyst. Analyses usingcatalyst test pieces with different active sites were performed toestimate this accumulation. The results suggested that NH4NO3accumulation does not depend on the presence of either Cu sites orBrønsted acid sites. Therefore, it is assumed that NH4NO3 can beaccumulated everywhere on the catalyst, including on the zeoliteframework. This phenomenon was included in the model asformation/accumulation sites S'. As a result, a modelconsidering the reaction behavior changes of fast SCR under 200 °Cwas developed. Validation results confirmed that the model couldaccurately predict NOx reduction phenomena for a wide range oftemperatures and NO2/NOx ratios. The results also suggested thatthe model was applicable under transient conditions of NH3concentration. The model performed well under a wide range ofconditions by considering active sites and reactions on thecatalyst
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-24-0073
- Access Restriction:
- Restricted for use by site license
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