Abstract
Ni-Zn mixed oxide catalysts with varying mole ratios were prepared by the coprecipitation method. These catalysts were characterized by Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction, temperature programmed reduction, H2 chemisorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. Selective hydrogenolysis of glycerol to 1,2-propanediol was carried out with these catalysts both in continuous (fixed bed) and batch (liquid phase) conditions. Higher glycerol conversion was achieved in a fixed bed than in liquid phase glycerol hydrogenolysis. The selectivity to 1,2-propanediol was more in batch mode hydrogenolysis, whereas acetol is the main product in the continuous mode. The activity of catalysts depended on the Ni to Zn mole ratio, which in turn influenced the metal surface area of Ni on ZnO. The catalyst with a Ni to Zn mole ratio of 2 exhibited the highest activity. The observed activity was corroborated with the derived physicochemical properties of the catalysts. Different reaction parameters were studied and optimum reaction conditions were established.
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