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Three-way Catalysis with Noble Metal-Substituted La(Fe,Co)O3 Perovskites - the Role of Noble and Base Metal Components

Heikens, Sascha and Ulrich, Victor and Joshi, Pragati A. and Saruhan-Brings, Bilge and Grünert, Wolfgang (2019) Three-way Catalysis with Noble Metal-Substituted La(Fe,Co)O3 Perovskites - the Role of Noble and Base Metal Components. Emission Control Science and Technology, 5, pp. 353-362. Springer. DOI: 10.1007/s40825-019-00123-4 ISBN 2199-3629 ISSN 2199-3629

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Abstract

La(FexCo1-x)O3 perovskites with noble metals incorporated (Pd in different amounts, Pt, Rh; with Pd at x = 1, 0.7, 0) were prepared via the dry citrate method and examined with respect to their behavior in three-way catalysis (lean and stoichiometric model feeds containing CO, propene, NO, and O2) in the as-prepared state and after redox stress of different severity (at temperatures up 1173 K). Results were compared with data obtained with a commercial Pd-based three-way catalyst. Perovskites outperformed the reference in CO oxidation but were less active in propene oxidation and NO reduction. While their oxidation activity was rather stable, their NO reduction activity suffered severely from the redox treatments unlike that of the reference. It was concluded that oxidation and reduction reactions are catalyzed by different sites. While the presence and the nature of the noble metal were mostly irrelevant for oxidation reactions, in particular for CO oxidation, NO reduction was dominated by the contribution of the noble metal component. The inferior NO reduction activity despite noble metal contents of up to 2.5 wt% and the dominance of the perovskite surface in propene oxidation (compared with high oxidation activity of Pd in the reference catalyst) suggest that the metal component was not well exposed in the perovskite catalysts.

Item URL in elib:https://elib.dlr.de/132749/
Document Type:Article
Title:Three-way Catalysis with Noble Metal-Substituted La(Fe,Co)O3 Perovskites - the Role of Noble and Base Metal Components
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Heikens, SaschaRuhr Universitat Bochum (RUB)UNSPECIFIED
Ulrich, VictorRUBUNSPECIFIED
Joshi, Pragati A.RUBUNSPECIFIED
Saruhan-Brings, BilgeBilge.Saruhan (at) dlr.deUNSPECIFIED
Grünert, WolfgangRuhr University BochumUNSPECIFIED
Date:20 May 2019
Journal or Publication Title:Emission Control Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:5
DOI :10.1007/s40825-019-00123-4
Page Range:pp. 353-362
Publisher:Springer
ISSN:2199-3629
ISBN:2199-3629
Status:Published
Keywords:Catalysts, Perovskites, Citrate method, Nitrogen Oxides
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Saruhan-Brings, Dr. Bilge
Deposited On:03 Jan 2020 11:32
Last Modified:03 Jan 2020 11:32

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