2024-03-29T11:54:01Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/34742016-02-16T02:49:49Zcom_10261_101com_10261_5col_10261_1362
DIGITAL.CSIC
author
Efstathiou, Angelos
author
Costa Costas, N.
author
García Fierro, José Luis
2008-04-08T11:18:01Z
2008-04-08T11:18:01Z
2003-08-21
International Publication Number: WO 2003/068390 A1
http://hdl.handle.net/10261/3474
[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.
spa eng
openAccess
Nuevo catalizador para la reducción de NO TO a N2 con Hidrógeno en condiciones NOx oxidantes
patente
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URL
https://digital.csic.es/bitstream/10261/3474/1/WO_2003_068390_A1.pdf
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WO_2003_068390_A1.pdf
URL
https://digital.csic.es/bitstream/10261/3474/4/WO_2003_068390_A1.pdf.txt
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text/plain
WO_2003_068390_A1.pdf.txt