Copper-containing mixed metal oxides (Al, Fe, Mn) for application in three-way catalysis

Mixed oxides were synthesized by co-precipitation of a Cu source in combination with Al, Fe or Mn corresponding salts as precursors. The materials were calcined at 600 and 1000 degrees C in order to crystallize the phases and to mimic the reaction conditions of the catalytic application. At 600 degrees C a mixed spinel structure was only formed for the combination of Cu and Mn, while at 1000 degrees C all the materials showed mixed spinel formation. The catalysts were applied in three-way catalysis using a reactor with a gas mixture containing CO, NO and O-2. All the materials calcined at 600 degrees C displayed the remarkable ability to oxidize CO with O-2 but also to reduce NO with CO, while the pure oxides such as CuO and MnO2 were not able to. The high catalytic activity at 600 degrees C was attributed to small supported CuO particles present and imperfections in the spinel structure. Calcination at 1000 degrees C crystallized the structure further which led to a dramatic loss in catalytic activity, although CuAl2O4 and CuFe2O4 still converted some NO. The materials were characterized by X-ray diffraction (XRD), Raman spectroscopy, H-2-Temperatrue Programmed Reduction (H-2-TPR), N-2-sorption and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX).

Jaar van publicatie:2020

Trefwoorden:A1 Journal article

BOF-keylabel:ja

BOF-publication weight:2

CSS-citation score:1

Authors from:Government

Toegankelijkheid:Open