Catalytic decomposition of N2O over Ni and Mg-magnetite catalysts

Abstract

The total decomposition of N₂O was performed on the partially nanocrystalline substituted M_xFe_3−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 Ni_0.75Fe_2.25O₄ and Mg_0.58Fe_2.42O₄ 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.