A series of transitional metal disubstituted ternary heteropoly quaternary ammonium salts, [TPA]4H3[PW7Mo3M2O38(H2O)2] (M = Mn, Co, Ni, Cu), were prepared by the reaction of the anion PW6Mo3O34 9− and the corresponding salts of the transitional metal in water, characterized by FI-IR, UV–Vis, XRD and TGA spectra, and appied to the epoxidation of 1-butene to 1,2-butene oxide (BO). The influences of temperature, reaction time, H2O2 concentration and catalyst concentration on the epoxidation of 1-butene were studied in the acetonitrile/hydrogen peroxide catalytic system. The variation ranges of these parameters ensuring a high H2O2 conversion and high selectivity of BO were established. It can be observed that the catalytic activity decreases in the order PWMoMn > PWMoCo > PWMoNi > PWMoCu. The best conversion of H2O2 and selectivity toward BO were achieved under optimized conditions: reaction time = 2 h, reaction temperature = 50 °C, H2O2 concentration = 0.5 mol/L and a catalyst concentration of 2.5 g/L. In particular, the catalyst PWMoMn is the most active one for epoxidation of 1-butene to BO (selectivity of BO up to 97.6 %).
Research on Chemical Intermediates – Springer Journals
Published: Feb 7, 2015
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