SINERGIA EN LA REDUCCIÓN CATALÍTICA SELECTIVA DE NOx SOBRE FERRITAS Cu1-XCoXFe2O4.
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| Title: | SINERGIA EN LA REDUCCIÓN CATALÍTICA SELECTIVA DE NOx SOBRE FERRITAS Cu |
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| Alternate Title: | SYNERGY IN THE SELECTIVE CATALYTIC REDUCTION OF NOX OVER Cu1-XCoXFe2O4 FERRITES. |
| Authors: | Briceño, Sarah1 sbriceno@ivic.gob.ve, Sagredo, Vicente2, Del Castillo, Hector3 |
| Source: | LatinAmerican Journal of Metallurgy & Materials / Revista Latinoamericana de Metalurgia y Materiales (RLMM). 2012, Vol. 32 Issue 1, p129-135. 7p. |
| Subjects: | Ferrites, Nanoparticles, Thermogravimetry, Gravimetric analysis |
| Abstract (English): | Ferrite nanoparticles of Cu1-XCoXFe2O4, were synthesized by sol-gel auto-combustion method and characterized using the techniques: Thermo gravimetric (TGA), Differential Thermal Analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Surface area (BET), X-ray spectroscopy (XPS), Temperature programmed reduction (TPR) and Temperature programmed desorption (TPD). The obtained particles with an average size of 100 nm and spherical shape. The catalytic tests revealed that the Cu1-XCoXFe2O4 ferrites are efficient catalysts for the Selective Catalytic Reduction of NOx (SCR-NOx), using a hydrocarbon as a reducing agent in the range of 250-450 ºC, obtaining a maximum conversion of 40% NO and 95% selectivity towards the formation of N2, suggesting the presence of a synergistic effect between Cu2+ and Co2+ in the system Cu1-XCoXFe2O4. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): | Nanopartículas de ferritas del tipo Cu1-XCoXFe2O4, se sintetizaron utilizando el método sol-gel de auto-combustión y se caracterizaron usando las técnicas: Análisis termo gravimétrico (TGA), Análisis térmico diferencial (DTA), Difracción de rayos X (DRX), Microscopía electrónica de barrido (MEB), Microscopía electrónica de transmisión (MET), Área superficial (BET), Espectroscopia de rayos X (XPS), Termo reducción a temperatura programada (TPR) y Termo desorción a temperatura programada (TPD). Las nanopartículas obtenidas con un tamaño promedio de 100 nm y de forma esférica, mostraron formación de conglomerados. Las pruebas catalíticas revelaron que las ferritas Cu1-XCoXFe2O4, son catalizadores eficientes para la Reducción catalítica selectiva de NOx (RCS-NOx), usando un hidrocarburo como agente reductor, alcanzando una conversión máxima de 40% de NO a 350°C y un 95% de selectividad hacia la formación de N2debido a la influencia de los metales Cu2+ y Co2+ sugiriendo la presencia de un efecto sinérgico en el sistema Cu1-x CoxFe2O4. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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