Guillermo César Mondragón Rodríguez

NOx-reductive Perovskite catalysts for lean-burn engines

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

• Broschiertes Buch

Produktbeschreibung

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.

Produktdetails

• Verlag: Südwestdeutscher Verlag für Hochschulschriften
• Seitenzahl: 164
• Erscheinungstermin: 12. Oktober 2015
• Englisch
• Abmessung: 220mm x 150mm x 11mm
• Gewicht: 262g
• ISBN-13: 9783838111827
• ISBN-10: 3838111826
• Artikelnr.: 28042620

Autorenporträt

Pd- and Rh- integrated perovskites are developed and characterized regarding the Pd-state by means of XRD, SEM, TEM, XPS, and H2, C3H6, C8H18 -SCR-NOx. Pd in the synthesized perovskites displays partially a reversible diffusion mechanism. These effects produce a self-regenerative mechanism and improved NOx reduction under lean conditions.