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Glycerol Hydrogenolysis Promoted by Supported Palladium Catalysts
Author(s) -
Musolino Maria Grazia,
Scarpino Luciano Antonio,
Mauriello Francesco,
Pietropaolo Rosario
Publication year - 2011
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201100063
Subject(s) - hydrogenolysis , coprecipitation , catalysis , palladium , chemistry , selectivity , x ray photoelectron spectroscopy , inorganic chemistry , metal , temperature programmed reduction , nuclear chemistry , chemical engineering , organic chemistry , engineering
Catalytic hydrogenolysis, with high conversion and selectivity, promoted by supported palladium substrates in isopropanol and dioxane at a low H 2 pressure (0.5 M Pa), is reported for the first time. The catalysts, characterized by using BET isotherms, transmission electron microscopy (TEM), temperature‐programmed reduction (TPR), powder X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS), were obtained by coprecipitation and impregnation techniques. The coprecipitation method allows catalysts with a metal–metal or a metal–support interaction to be obtained, which enhances the catalytic performance for both the conversion of glycerol and the selectivity to 1,2‐propanediol. Analogous reactions carried out with catalysts prepared by using impregnation are less efficient. A study of the solvent and temperature effect is also presented. The obtained results allow the hydrogenolysis mechanism to be inferred; this involves both the direct replacement of the carbon‐bonded OH group by an incoming hydrogen or the formation of hydroxyacetone as an intermediate, which subsequently undergoes a hydrogenation process to give 1,2‐propanediol. Finally, catalytic tests on a large‐scale reaction at a higher H 2 pressure and recycling of the samples were carried out with the better performing catalysts (Pd/CoO and Pd/Fe 2 O 3 prepared by using coprecipitation) to verify possible industrial achievements.