Improved structural and catalytic attributes of Ba2Co2Fe_(12-2x)(Zr,Ni)_xO_(22) materials synthesized by sol-gel and microwave heating methods

摘要

Nominal composition of Zr-Ni co-doped Ba2Co2Fe_(12-2x)(Zr,Ni)_xO_(22) (x = 0.2-1.0) Y-type hexaferrites were synthesized by conventional sol-gel and microwave heating methods. Structural analysis was carried out by TGA, SEM, XRD, O2-TPD and BET surface area. Microwave synthesized samples revealed good morphological properties with high surface area and high porosity compared to that obtained by the sol-gel method. Catalytic decomposition of N2O was achieved at low temperatures of 600 °C and 700 °C for microwave and sol-gel prepared samples, respectively. The catalysts are found workable and stable even at 1146 °C with very good N2O decomposition efficiency. Substituting iron with Zr-Ni further enhanced the catalytic activity in both the cases.