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- W2058129711 abstract "The synthesis of manganese-based octahedral molecular sieves of the type K-OMS 2 was designed by central composite design (CCD) method. The effect of aging time and temperature was considered for K-OMS 2 synthesis. Consequently, the synthesis was carried out through hydrothermal process without calcination and the obtained K-OMS 2 was tested for benzene oxidation. The physicochemical properties of as-synthesized K-OMS 2 catalysts were characterized by XRD, BET and SEM. The oxidative species of manganese were identified by analysis of the Mn K-edge XANES spectra. CCD results revealed that the crystallization conditions for K-OMS 2 synthesis were dependent on aging temperature and time. The specific surface area of K-OMS 2 was inversely proportional to the aging temperature. The K-OMS 2 sample with aging time of 21 h at aging temperature of 75 °C showed the best catalyst for benzene oxidation. This catalyst was a mixture of Mn2O3 and MnO2 with Mn3 +/Mn4 + ratio of 0.09 as evaluate by XANES technique. It was discovered that the K-edge energy of Mn in each as-synthesized K-OMS 2 samples was 6551.4 eV close to Mn3 + and Mn4 + species. The Mn3 +/Mn4 + ratios were found to have a range of 0.09–0.16. However, a decrease in Mn3 +/Mn4 + ratio and a corresponding decrease in catalytic activity were encountered at high aging time and temperature. Low aging temperature and long aging time could provide active species of manganese oxides for benzene oxidation." @default.
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- W2058129711 date "2015-06-01" @default.
- W2058129711 modified "2023-09-23" @default.
- W2058129711 title "Effect of manganese oxidative species in as-synthesized K-OMS 2 on the oxidation of benzene" @default.
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- W2058129711 doi "https://doi.org/10.1016/j.surfcoat.2014.12.025" @default.
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