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Nuevo catalizador para la reducción de NO TO a N2 con Hidrógeno en condiciones NOx oxidantes

Other TitlesNovel Catalyst for the reduction of NO TO N2 with hydrogen under NOx oxidation condictions
AuthorsEfstathiou, Angelos; Costa Costas, N.; García Fierro, José Luis
Issue Date21-Aug-2003
CitationInternational Publication Number: WO 2003/068390 A1
Abstract[EN] The invention relates to a novel catalyst having excellent activity, selectivity and stability for reducing nitric oxide to gas nitrogen, with hydrogen being used as a reducing agent, in the low temperature range 100-200 °C and in the presence of an excess of oxygen (e.g. 5 % vol), H2O (5 % vol) and/or SO2 (20 ppm) in the supply. The inventive catalyst consists of platinum crystals which are in contact with the phases of a mixed MgO and CeO2 medium or in the form of platinum supported on the mixed MgO-CeO2 medium which has already been sulphated in a selective manner. The Pt/MgO-CeO2 catalyst can be used to obtain NO conversion levels which are greater than 40 % and nitrogen selectivity values of greater than 80 % under NOx oxidation conditions in the 100-400 °C temperature range and for a surface contact time of 0.045 s. In particular, full NO conversion is obtained as well as N2 selectivity levels of 83 % at 150 °C with a reaction mixture of 0.25 % NO/1 % H2/5 % O2/5 % H2O/He.
[ES]Nuevo catalizador que presenta actividad, selectividad y estabilidad excelentes para la reducci6n de 6xido nitrico a nitr6geno gas con hidr6geno como agente reductor en el rango de temperaturas bajas de 100 200 0C y en presencia de exceso de oxigeno (p.ej. 5 % vol), H20 (5 % vol) y/o SO2 (20 ppm), en la alimentaci6n. El catalizador consiste en cristales de platino en contacto con las fases de un soporte mixto de MgO y CeO2 o en forma de platino soportado sobre el soporte mixto MgO CeO2 previamente sulfatado de forma selectiva. Con el catalizador PtIMgO CeO2 se obtienen niveles de conversi6n de NO superiores a 40 % y valores de selectividad de nitr6geno por encima del 80 % en condiciones de NOx oxidantes en el rango de temperatura 100 400 0C y con un tiempo de contacto superficial de 0.045 s. En particular, se obtiene conversi6n completa de NO y niveles de selectividad a N2 de 83 % a 150 0C con una mezcla de reacci6n de 0.25 % NO/i % H2/5 % 02/5 %H20/He.
DescriptionFiling Date: 2003-02-14.--Priority Data: ES P 0200368 (2002-02-15)
Appears in Collections:(ICP) Patentes
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