期刊
APPLIED CATALYSIS A-GENERAL
卷 579, 期 -, 页码 151-158出版社
ELSEVIER
DOI: 10.1016/j.apcata.2019.04.013
关键词
The redox-precipitation method; KxMn(8)O(16); Mn-Ce catalyst; Lean methane; Catalytic combustion
资金
- National Natural Science Foundation of China [51676076]
- National Key Research and Development Program of China [2018YFB0605105]
- Research and Development Fund of SKLCC [FSKLCC1805]
Various catalysts were synthesized by the redox-precipitation (RP) and co-precipitation (CP) methods, and their catalytic performances for the complete catalytic oxidation of lean methane combustion were investigated. The synthetic catalysts were characterized by BET, XRD, Raman, XPS, TG, UV-vis and H2-TPR. MnCe-RP showed 50% methane conversion to CO2 at (similar to)446 degrees C, which was 23 degrees C lower the temperature required for MnCe-CP. The active components (KxMn8O16) in the bulk and on the surface of MnCe-RP were confirmed. The redox-precipitation method synthesized open nanorod and nanosphere catalysts containing KxMn8O16 and Mn5O8, whereas the co-precipitation method synthesized agglomerate catalysts containing only Mn5O8. The higher surface-concentrations of Mn4+, Ce3+ and O-alpha on MnCe-RP are beneficial for its higher catalytic performance. Furthermore, the optical bandgap value of MnCe-RP is lower than that of MnCe-CP, and the K ion in KxMn8O16 may weaken the Mn-O bond, improving the catalyst reducibility, especially for the reduction process of Mn3O4 -> MnO.
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