Effect of the functional groups of carbon on the surface and catalytic properties of Ru/C catalysts for hydrogenolysis of glycerol

•The nitric acid treatment creates oxygen groups on the activated carbon surface.•Nitroxyl nitrate precursor generates oxygenated groups at the surface of Ru/C catalysts.•Carboxyl groups promote formation of 1,2-propanediol from glycerol.•Oxygenated groups enhance the CC and the CO cleavage of glyce...

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Bibliographic Details
Published in:Applied surface science 2013-12, Vol.287, p.108-116
Main Authors: Gallegos-Suarez, E., Pérez-Cadenas, M., Guerrero-Ruiz, A., Rodriguez-Ramos, I., Arcoya, A.
Format: Article
Language:English
Subjects:
1,2-Propanediol
Carbon
Carboxylic groups
Catalysis
Catalysts
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Ethylene glycol
Exact sciences and technology
Glycerol hydrogenolysis
Glycerols
Nitrates
Physics
Precursors
Ru/carbon supported catalysts
Surface chemistry
X-ray photoelectron spectroscopy
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Summary:•The nitric acid treatment creates oxygen groups on the activated carbon surface.•Nitroxyl nitrate precursor generates oxygenated groups at the surface of Ru/C catalysts.•Carboxyl groups promote formation of 1,2-propanediol from glycerol.•Oxygenated groups enhance the CC and the CO cleavage of glycerol.•Formation of ethylene glycol is inhibited by effect of carboxyl acid sites. Ruthenium catalysts supported on activated carbons, original (AC) and treated with nitric acid (AC-Ox) were prepared by incipient wetness impregnation from either chloride (Cl) or nitroxyl nitrate (n) precursors. These catalysts were characterized by TG, XPS, TEM, TPD-MS and CO adsorption microcalorimetry and evaluated in the hydrogenolysis of glycerol in the liquid phase, at 453K and 8MPa. Studies by TEM show that ruthenium particles supported on AC-Ox are larger than on AC, without any effect of the nature of the metal precursor. However, adsorption of CO on the ex-chloride catalysts is inhibited in comparison with that of the ex-nitroxyl nitrate catalysts. Catalysts characterization by TG, TPD-MS and XPS reveals that the nitric acid treatment and the nitroxyl nitrate precursor generate oxygenated groups on the carbon surface, which provide acid properties to the catalysts, although they are partly destroyed during the reduction treatment applied to the catalysts. The sequence of the overall TOF, Ru(Cl)/AC
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.09.087