Selective Hydrogenolysis of Glycerol over Bifunctional Copper–Magnesium-Supported Catalysts for Propanediol Synthesis

• Published in: Industrial & engineering chemistry research Vol. 59; no. 14; pp. 6506 - 6516
• Main Authors: Kumar, Praveen, Shah, Abdul Karim, Lee, Jung-Ho, Park, Yeung Ho, Štangar, Urška Lavrenčič
• Format: Journal Article
• Language: English
• Published: American Chemical Society 08-04-2020
• DOI: 10.1021/acs.iecr.9b06978
• EISSN: 1520-5045
• ISSN: 0888-5885

In the present study, bimetallic Cu–Mg-supported silica catalysts were prepared by a chemisorption–hydrolysis method with different loadings of copper/magnesium and used for glycerol hydrogenolysis for 1,2-propanediol (1,2-PDO). The Cu catalyst with the base as a promoter showed the highest activity for glycerol hydrogenolysis reaction (glycerol conversion 89.5% and 1,2-PDO selectivity 92.1%). The copper seemed to significantly affect the C–C cleavage and C–O cleavage of glycerol for 1,2-PDO formation. The synthesized catalysts were characterized by N2 sorption, X-ray diffraction (XRD), temperature-programmed desorption of NH3 (TPD-NH3), temperature-programmed reduction of H2 (TPR-H2), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), CO chemisorption, Fourier transform infrared (FTIR), and IR analyses of absorbed pyridine. It was found that MgO content influenced the activity of the Cu-supported catalyst. Glycerol hydrogenolysis was found to be highly dependent upon the acidity and reducing property of Cu–Mg-supported silica catalysts. The high catalytic performance of the Cu–Mg-supported/silica catalyst was attributed to the copper dispersion and the existence of Cu+ species and acidic sites. The 1,2-PDO selectivity and glycerol conversion may be easily tuned by the Cu/Mg molar ratio.