Search

Manganese oxides supported on γ-AlO, amorphous SiO, MCM-41, and TiO prepared by an impregnation method were used as heterogeneous catalysts for epoxidation of alkenes with 30 % HO in the presence of NaHCO aqueous solution. The effect of support and manganese loading on their activity was studied. The 1.3-MnO/γ-AlO exhibited superior epoxidazing activity of styrene, compared with other supported MnO. Hydrogen temperature-programmed reduction, UV-vis and ESR analyses suggested that Mn (catalytic activity species) dominated in 1.3 % MnO/γ-AlO due to a strong interaction between MnO and γ-AlO. Recycling studies showed the catalyst was a heterogeneous one and retained its activity after recycling four times. [ABSTRACT FROM AUTHOR]