Abstract

BRICENO, Sarah; SAGREDO, Vicente  and  DEL CASTILLO, Hector. Synergy in the selective catalytic reduction of no_x over Cu_1-xco_xFe₂o₄ ferrites. Rev. LatinAm. Metal. Mater. [online]. 2012, vol.32, n.1, pp.129-135. ISSN 0255-6952.

Ferrite nanoparticles of Cu_1-XCo_XFe₂O4, 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 Cu_1-XCo_XFe₂O₄ 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 Cu^{2+ and Co2+} in the system Cu_1-xCo_xFe₂O₄.

Keywords : ferrites; nanoparticles; Cu_1-XCo_XFe₂O₄; sol-gel; SCR-NOx.