New Journal of Chemistry p. 10073 - 10086 (2019)
Update date:2022-08-30
Topics:
Pandey, Dinesh Kumar
Biswas, Prakash
In this study, different acidic (V2O5, ZrO2, and TiO2) and basic (CaO and MgO) oxide-supported copper-zinc bimetallic catalysts were prepared by a deposition-precipitation method, and they were evaluated for the vapor-phase hydrogenolysis of glycerol to propylene glycol at 0.1 MPa and at 220 °C. The catalysts were thoroughly characterized by different techniques such as BET, XRD, H2-TPR, NH3 and CO2 TPD, N2O adsorptive decomposition, TEM, XPS, FE-SEM and TGA. Among all the supported catalysts, the Cu-Zn/MgO catalyst was found to be the most selective to propylene glycol. High copper-metal dispersion (~5%), surface area (~23 m2 g-1), the highest basicity (0.25 mmol CO2 g cat-1) and the availability of partially reduced copper species (Cu2O, CuO and Cu0) were the primary reasons for the higher propylene glycol selectivity. At optimum reaction conditions, i.e., at 220 °C, 0.72 MPa and a weight hourly space velocity (WHSV) of 0.073 h-1, ~98.5% conversion of glycerol with ~89% selectivity to propylene glycol was obtained over the Cu-Zn/MgO catalyst. This catalyst was also found to be stable for a long period of time (84 h) without much deactivation and without decrease in the selectivity to propylene glycol.
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