期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 7, 页码 4417-4426出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b00818
关键词
cobalt-doped MnO2; dual reactive sites; propane deep oxidation; in situ DRIFTS; synergistic effect
资金
- National Key R&D Program of China [2017YFC0211202]
- International Postdoctoral Exchange Fellowship Program [20180020]
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% (T-50) and 90% (T-90) at 205 and 223 degrees C, respectively. The Co-related species is more responsible for reducing the light-off temperature (T-50), whereas the Mn-related species helps more to decrease complete oxidation temperature (T-90). 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.
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