Preparation, Characterization and Application on Catalytic Removal of NOx for Ni/Cu/Fe Mixed Metal Oxides

Ni/Cu/Fe mixed metal oxides (Ni/Cu/Fe-MMOs) were prepared by calcination of Ni/Cu/Fe layered double hydroxides (Ni/Cu/Fe-LDHs) precursors. Their composition, structure and morphology were characterized by ICP, XRD, FT-IR, BET and SEM. Ni/Cu/Fe-MMOs were used for catalytic removal of NOx by hydrocarbon. Their catalytic activities were studied by NOx analyzer. The results show that Ni/Cu/Fe-MMOs have homogeneous distribution of hexagon with particles size around 30~50nm and specific surface areas of 10~35 m2∙g–1. Ni/Cu/Fe-MMOs sample with molar ration of Ni/Cu/Fe = 5:1:3 exhibits the highest NOx conversion of 15.3%. Ni/Co/Cu/Fe-MMOs have better catalytic activities than both Ni/Cu/Fe-MMOs and Cu/Co/Fe-MMOs. For Ni/Cu/Fe-MMOs, propene is the better reductant than octane.