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Synergy in the selective catalytic reduction of NO<inf>x</inf> over Cu <inf>1-X</inf>Co<inf>X</inf>Fe<inf>2</inf>O<inf>4</inf> ferrites

Abstract:

Ferrite nanoparticles of Cu1-XCoXFe2O 4, 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-XCoXFe2O4 ferrites are efficient catalysts for the Selective Catalytic Reduction of NOx (SCR-NO x), using a hydrocarbon as a reducing agent in the range of 250-450 °C, 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 Cu 1-XCoXFe2O4. © 2012 Universidad Simón Bolívar.