Vetenskap & teknik
Pocket
NOx-reductive Perovskite catalysts for lean-burn engines
Mondragn Rodrguez Guillermo Csar
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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, oH6, and oH18). 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 300C. For instance, Ba- and Ce- substituted perovskites are also active for NO-reduction up to 400C.
- Format: Pocket/Paperback
- ISBN: 9783838111827
- Språk: Engelska
- Antal sidor: 164
- Utgivningsdatum: 2009-10-26
- Förlag: Sudwestdeutscher Verlag Fur Hochschulschriften AG