Flower‐Like Mn‐Doped CeO ₂ Microstructures: Synthesis, Characterizations, and Catalytic Properties

Abstract

Mn‐doped CeO 2 flower‐like microstructures have been synthesized by a facile method, involving the precipitation of metallic alkoxide precursor in a polyol process from the reaction of CeCl 3 ·7H 2 O with ethylene glycol in the presence of urea followed by calcination. By introducing manganese ions, the composition can be freely manipulated. To investigate whether there was a hybrid synergic effect in CH 4 combustion reaction, further detailed characteristics of Mn‐doped CeO 2 with various manganese contents were revealed by XRD, Raman, FT‐IR, SEM, EDS, XPS, OSC, H 2 ‐TPR, and N 2 adsorption‐desorption measurements. The doping manganese is demonstrated to increase the storage of oxygen vacancy for CH 4 and enhance the redox capability, which can efficiently convert CH 4 to CO 2 and H 2 O under oxygen‐rich condition. The excellent catalytic performance of MCO‐3 sample, which was obtained with the starting Mn/Ce ratios of 0.2 in the initial reactant compositions, is associated with the larger surface area and richer surface active oxygen species.