Cobalt-Doped MnO2 Nanofibers for Enhanced Propane Oxidation
journal contributionposted on 17.06.2019 by Long Chen, Jiancai Ding, Jingbo Jia, Rui Ran, Cheng Zhang, Xiping Song
Any type of content formally published in an academic journal, usually following a peer-review process.
We develop a host–guest strategy to construct cobalt-doped MnO2 nanofibers with dual reactive sites, which exhibit high activity for propane deep oxidation. After the incorporation of cobalt (the actual molar ratio of Co/Mn up to 0.15), no distinct changes of crystal structure and morphology of MnO2 nanofibers were observed, as evidenced by X-ray diffraction and transmission electron microscopy. The optimized MnCo0.2 nanofibers possessed the advantages of Mn and Co and exhibited the propane conversion of 50% (T50) and 90% (T90) at 205 and 223 °C, respectively. The Co-related species is more responsible for reducing the light-off temperature (T50), whereas the Mn-related species helps more to decrease complete oxidation temperature (T90). Furthermore, the in situ diffuse reflectance infrared Fourier transform spectroscopy results revealed the roles of Co-related species and Mn-related species during propane adsorption and oxidation. The finding demonstrates the win-win effect of two active oxides and provides a solution for developing highly efficient propane oxidation catalysts.