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Development and characterization of NOx-reductive catalytic coating systems for lean-burn engines

Mondragón Rodríguez, G.C. (2009) Development and characterization of NOx-reductive catalytic coating systems for lean-burn engines. Dissertation, Ruhr-Universität Bochum.

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Official URL: http://dispatch.opac.d-nb.de/DB=4.1/SET=2/TTL=1/REL?PPN=139418385

Abstract

In the present work Pd- and Rh- integrated perovskites are developed and characterized regarding the state of Pd and catalytic activity by means of microstructural and spectroscopic methods (XRD, SEM, TEM, XPS, and -SCR-NOx). Pd in the La-based perovskite partially displays a reversible diffusion mechanism under redox atmospheres at 600°C. These effects produce a self-regenerative mechanism at relatively high temperatures. Catalytic testing under model gas mixtures of powders and coatings of these perovskites proves the potential of these materials for effective NOx-reduction under lean conditions. Hydrogen provides the best NO-reduction results among the employed reducing agents (i.e. H2, C3H6, and C8H18). The Pd-integrated Perovskites display peak NO-conversions of 72 % and N2-selectivities of 72 % in the presence of H2O-vapour and CO2 at temperatures below 300°C. For instance, Ba- and Ce- substituted perovskites are also active for NO-reduction up to 400°C.

Document Type:Thesis (Dissertation)
Title:Development and characterization of NOx-reductive catalytic coating systems for lean-burn engines
Authors:
AuthorsInstitution or Email of Authors
Mondragón Rodríguez, G.C.UNSPECIFIED
Date:2009
Number of Pages:148
Status:Published
Keywords:NOx-reduction, Pd-integrated perovskite, Lean conditions
Institution:Ruhr-Universität Bochum
Department:Fakultät für Maschinenbau
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Guillermo Cesar Mondragon Rodriguez
Deposited On:23 Nov 2009 12:03
Last Modified:15 Jan 2010 02:11

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