Characterization of CaO-CuO-CeO2 mixed oxide synthesized by the impregnation and investigation of its reusability

Abstract

CaO-CuO-CeO₂ mixed oxide was prepared by the impregnation method and used as the catalyst for the complete decomposition of phenol in the presence of hydrogen peroxide. The  CaO-CuO-CeO₂ mixed oxide were characterized by XRD, SEM, BET, H₂-TPR and Raman spectroscopy. The results indicated that there were three CuO species in the mixed oxide: the finely dispersed CuO species on the surface of CeO₂, the Ce_1-x-yCu_xCa_yO_2-dsolid solution and the bulk CuO. Most of particles have clear morphology with relatively uniform size in the range of 30 - 50 nm and the BET surface area was 37.96 m²/g. After three times of use, the catalytic activity of CaO-CuO-CeO₂ mixed oxide was still relatively high and much higher than the mixed oxide CaO-CeO₂ and CuO-CeO₂.