Synthesis and characterization of manganese doped CeO2 nanopowders from hydrolysis and oxidation of Ce37Mn18C45

The Mn-doped CeO₂ nanopowders with high catalysis activity were successfully fabricated through a simple hydrolyzed-oxidized approach. Firstly, the alloy Ce₃₇Mn₁₈C₄₅ was prepared in vacuum induction melting furnace. Subsequently, Mn-doped CeO₂ nanopowders with 142 m²/g of specific surface area were obtained through a simple hydrolyzed-oxidized procedure of the alloy. Those nanopowders were heat treated at different temperatures. The obtained materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and energy dispersive spectroscopy (EDS). And the catalytic activity on vinyl chloride (VC) emission combustion was investigated. The results showed that those nanopowders after hydrolyzed-oxidized from Ce₃₇Mn₁₈C₄₅ mainly consisted of CeO₂ and Mn₃O₄. Manganese element increased the thermal stability of CeO₂ nanopowders. The Mn-doped CeO₂ nanopowders had three morphologies. Small particles were Mn-doped CeO₂, square particles were Mn₃O₄ and the rods were Mn₃O₄ and Mn₂O₃. The Mn-doped CeO₂ nanopowders had good vinyl chloride (VC) emission catalytic performance.