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Comparative catalytic evaluation of nano ZrOx promoted manganese catalysts: kinetic study and effect of doping on aerobic oxidation of secondary alcohols

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Document pages: 14 pages

Abstract: This work reports the preparation of MnCO3 doped zirconia (ZrOx) nano particle catalyst and the synthesis of zirconia manganese carbonate [x ZrOx – MnCO3] (where = 0 – 7 ) catalyst by simple and easy coprecipitation technology. The catalyst is calcined at 400 ° C and converted to zirconia manganese dioxide [1 ZrOx – MnO2]. When calcined at 500 ° C, it is converted to zirconia manganese trioxide [1 ZrOx – Mn2O3]. Using molecular oxygen as clean oxidant, the catalytic efficiency of carbonate and oxide for the selective oxidation of 1-phenylethanol was studied. The effects of ZrOx w W , reaction time, calcination temperature, catalyst dosage and reaction temperature on the reaction were investigatednol as a model substrate. The 1 ZrOx–MnCO3 precalcined at 300°C exhibited the best catalytic efficiency. It was found that ZrOx nanoparticles also play an essential role in enhancing the effectiveness of the catalytic system for the aerobic oxidation of alcohols. Furthermore, the physical and chemical properties of synthesized catalysts were evaluated by microscopic and spectroscopic techniques. An extremely high specific activity of 40 mmol·g−1·h−1 with a 100 conversion of oxidation product and selectivity of >99 was achieved within extremely short reaction time (6 min).

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