Catalytic decomposition of N2O over Ni and Mg-magnetite catalysts

摘要

The total decomposition of N2Owas performed on the partially nanocrystalline substituted M_xFe_(3-x)O4 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 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 Fe~(2+) substitution amount by Ni~(2+) and Mg~(2+) 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.