Citation:
Jiafeng Bao, Hao Chen, Shize Yang, Pengfei Zhang. Mechanochemical redox-based synthesis of highly porous CoxMn1-xOy catalysts for total oxidation[J]. Chinese Journal of Catalysis,
;2020, 41(12): 1846-1854.
doi:
10.1016/S1872-2067(20)63635-X
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A mechanochemical redox reaction between KMnO4 and CoCl2 was developed to obtain a CoxMn1-xOy catalyst with a specific surface area of 479 m2 g-1, which was higher than that obtained using a co-precipitation (CP) method (34 m2 g-1), sol-gel (SG) method (72 m2 g-1), or solution redox process (131 m2 g-1). During catalytic combustion, this CoxMn1-xOy catalyst exhibited better activity (T100 for propylene= ~200 ℃) than the control catalysts obtained using the SG (325 ℃) or CP (450 ℃) methods. The mechanical action, mainly in the form of kinetic energy and frictional heating, may generate a high degree of interstitial porosity, while the redox reaction could contribute to good dispersion of cobalt and manganese species. Moreover, the as-prepared CoxMn1-xOy catalyst worked well in the presence of water vapor (H2O 4.2%, >60 h) or SO2 (100 ppm) and at high temperature (400 ℃, >60 h). The structure MnO2·(CoOOH)2.93 was suggested for the current CoxMn1-xOy catalyst. This catalyst could be extended to the total oxidation of other typical hydrocarbons (T90=150 ℃ for ethanol, T90 =225 ℃ for acetone, T90=250 ℃ for toluene, T90 =120 ℃ for CO, and T90=540 ℃ for CH4). Scale-up of the synthesis of CoxMn1-xOy catalyst (1 kg) can be achieved via ball milling, which may provide a potential strategy for real world catalysis.
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