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. XRD patterns of Mn-doped CeO2 nanopowders at different temperatures (1–4) and pure CeO2 nanopowders at 600 °C (5)