Catalytic decomposition of N2O over Ni and Mg-magnetite catalysts
Abstract
The total decomposition of N2O was performed on the partially nanocrystalline substituted MxFe3−xO4 magnetite (M2+ = Ni2+ and Mg2+ with x = 0–1). The given results showed that the partial incorporation of Fe2+ by Ni2+ and Mg2+ into Fe3O4 spinel frameworks led to a significant amelioration in the catalytic activity for the N2O catalytic reaction. Furthermore, the catalytic activity of synthesized substrates depended on the Fe2+ substitution amount by Ni2+ and Mg2+ cations. The N2O conversion reached 20% (chemical regime) over the Ni0.75Fe2.25O4 and Mg0.58Fe2.42O4 catalysts at 395 and 404 K for N2O (5000 ppm), respectively. A relative increase of decomposition temperatures was observed after O2 addition. Moreover, other results show that the N2O conversion shifted to higher temperatures at high space velocities.