Journal Article

FZJ-2021-02703

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Composition/Performance Evaluation of Lean NOx Trap Catalysts for Coupling with SCR Technology

Schönebaum, S. ; Dornseiffer, J. (Corresponding author)FZJ* ; Mauermann, P. ; Wolkenar, B. ; Sterlepper, S. ; Wessel, E.FZJ* ; Iskandar, R. ; Mayer, J.FZJ* ; Weirich, T. E. ; Pischinger, S. ; Guillon, O.FZJ* ; Simon, U.

2021
WILEY-VCH Verlag Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/28004  doi:10.1002/cctc.202001761

Abstract: The washcoat composition and the catalytic properties of two commercially available lean NOx traps (LNTs) were investigated. Both catalysts contained nominally the same NOx storage and catalytic materials but differed strongly in their amount and activity as well as in the composition of their layered washcoat architecture. In lean-rich cycle experiments under realistic engine-out gas compositions using a laboratory gas test bench, the LNTs showed comparable NOx storage behavior. At temperatures below 250 °C, the lean phase durations last up to 300 s until 50 % of the NOx storage capacity is reached. The simultaneously calculated NOx storage efficiencies drop rapidly below 35 %, resulting in a high NOx slip. Strong variations were observed in N2O and NH3 selectivity and in CO slip during regeneration of both LNTs caused by the different oxygen storage capacity (OSC), water gas shift (WGS) activity and rhodium distribution in the catalytic layers. Based on the obtained results, proposals were made to optimize the storage and regeneration performance, leading to highly efficient LNT catalysts for coupling with a downstream SCR catalyst.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Werkstoffstruktur und -eigenschaften (IEK-2)
3. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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