Catalytic decomposition of N2O over Ni and Mg-magnetite catalysts

The total decomposition of N 2 O was performed on the partially nanocrystalline substituted M x Fe 3− x O 4 magnetite (M 2+ = Ni 2+ and Mg 2+ with x = 0-1). The given results showed that the partial incorporation of Fe 2+ by Ni 2+ and Mg 2+ into Fe 3 O 4 spinel frameworks led to a significant amelioration in the catalytic activity for the N 2 O catalytic reaction. Furthermore, the catalytic activity of synthesized substrates depended on the Fe 2+ substitution amount by Ni 2+ and Mg 2+ cations. The N 2 O conversion reached 20% (chemical regime) over the Ni 0.75 Fe 2.25 O 4 and Mg 0.58 Fe 2.42 O 4 catalysts at 395 and 404 K for N 2 O (5000 ppm), respectively. A relative increase of decomposition temperatures was observed after O 2 addition. Moreover, other results show that the N 2 O conversion shifted to higher temperatures at high space velocities. Partial incorporation of Ni 2+ and Mg 2+ into Fe 3 O 4 led to a significant improvement in the activity for the N 2 O decomposition.