Composition/Performance Evaluation of Lean NOx Trap Catalysts for Coupling with SCR Technology
ChemCatChem, vol. 13, pp. 1787–1805
Abstract
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.
Authors 12
-
Simon Schönebaum Aachen Center for Automotive Catalytic Systems Aachen Institute of Inorganic Chemistry
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute of Inorganic Chemistry (IAC) RWTH Aachen University Landoltweg 1 52074 Aachen Germany
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
-
Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute of Energy and Climate Research: Materials Synthesis Processing (IEK-1) Forschungszentrum Jülich Leo-Brandt-Straße 52425 Jülich Germany
JARA-ENERGY Wilhelm-Johnen-Straße 52425 Jülich Germany
-
Peter Mauermann Aachen Center for Automotive Catalytic Systems Aachen Institute for Combustion Engines Aachen (VKA)
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute for Combustion Engines Aachen (VKA) RWTH Aachen University Forckenbeckstraße 4 52074 Aachen Germany
-
Bernd Wolkenar Aachen Center for Automotive Catalytic Systems Aachen Institute for Combustion Engines Aachen (VKA)
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute for Combustion Engines Aachen (VKA) RWTH Aachen University Forckenbeckstraße 4 52074 Aachen Germany
-
Stefan Sterlepper corresponding Aachen Center for Automotive Catalytic Systems Aachen Institute for Combustion Engines Aachen (VKA)
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute for Combustion Engines Aachen (VKA) RWTH Aachen University Forckenbeckstraße 4 52074 Aachen Germany
-
Forschungszentrum Jülich · Jülich Aachen Research Alliance
Affiliation as printed
Institute of Energy and Climate Research: Microstructure and Properties (IEK-2) Forschungszentrum Jülich Leo-Brandt-Straße 52425 Jülich Germany
JARA-ENERGY Wilhelm-Johnen-Straße 52425 Jülich Germany
-
Riza Iskandar Aachen Center for Automotive Catalytic Systems Aachen Central Facility for Electron Microscopy
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Central Facility for Electron Microscopy (GFE) RWTH Aachen University Ahornstraße 55 52074 Aachen Germany
-
Joachim Mayer Aachen Center for Automotive Catalytic Systems Aachen Central Facility for Electron Microscopy
Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Central Facility for Electron Microscopy (GFE) RWTH Aachen University Ahornstraße 55 52074 Aachen Germany
JARA-ENERGY Wilhelm-Johnen-Straße 52425 Jülich Germany
-
Thomas E. Weirich Aachen Center for Automotive Catalytic Systems Aachen Central Facility for Electron Microscopy
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Central Facility for Electron Microscopy (GFE) RWTH Aachen University Ahornstraße 55 52074 Aachen Germany
-
Stefan Pischinger Aachen Center for Automotive Catalytic Systems Aachen Institute for Combustion Engines Aachen (VKA)
Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute for Combustion Engines Aachen (VKA) RWTH Aachen University Forckenbeckstraße 4 52074 Aachen Germany
JARA-ENERGY Wilhelm-Johnen-Straße 52425 Jülich Germany
-
Olivier Guillon Aachen Center for Automotive Catalytic Systems Aachen Institute of Mineral Engineering (GHI)
Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute of Energy and Climate Research: Materials Synthesis Processing (IEK-1) Forschungszentrum Jülich Leo-Brandt-Straße 52425 Jülich Germany
Institute of Mineral Engineering (GHI) RWTH Aachen University Mauerstraße 5 52064 Aachen Germany
JARA-ENERGY Wilhelm-Johnen-Straße 52425 Jülich Germany
-
Affiliation as printed
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Institute of Inorganic Chemistry (IAC) RWTH Aachen University Landoltweg 1 52074 Aachen Germany
Center for Automotive Catalytic Systems Aachen (ACA) RWTH Aachen University Schinkelstraße 8 52062 Aachen Germany
Cited by 21 stored of 21
No patents citing this paper on Lens.org (checked 2026-10-06).