Manganese oxides supported on γ-Al2O3, amorphous SiO2, MCM-41, and TiO2 prepared by an impregnation method were used as heterogeneous catalysts for epoxidation of alkenes with 30 % H2O2 in the presence of NaHCO3 aqueous solution. The effect of support and manganese loading on their activity was studied. The 1.3-MnO x /γ-Al2O3 exhibited superior epoxidazing activity of styrene, compared with other supported MnO x . Hydrogen temperature-programmed reduction, UV–vis and ESR analyses suggested that Mn2+ (catalytic activity species) dominated in 1.3 % MnO x /γ-Al2O3 due to a strong interaction between MnO x and γ-Al2O3. Recycling studies showed the catalyst was a heterogeneous one and retained its activity after recycling four times.
Research on Chemical Intermediates – Springer Journals
Published: Mar 17, 2013
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