Surface and structural properties of titania-supported Ru catalysts for hydrogenolysis of glycerol

• Published in: Applied catalysis. A, General General, 2010-08, Vol.384 (1), p.107-114
• Main Authors: Balaraju, M., Rekha, V., Devi, B.L.A. Prabhavathi, Prasad, R.B.N., Prasad, P.S. Sai, Lingaiah, N.
• Format: Article
• Language: English
• Subjects: 1,2-Propanediol; Catalysis; Catalysts; Chemisorption; Deposition–precipitation; Glycerol; Glycerols; Hydrogenolysis; Nanostructure; Ruthenium; Titania; Titanium dioxide; X-rays
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2010.06.013

[Display omitted] ▶ Titania-supported Ru is efficient catalysts for glycerol hydrogenolysis. ▶ The activity of the catalyst depends on the nature of Ru particles on titania. ▶ The structural and surface properties depend on the catalyst preparation method. ▶ The catalyst is reusable and active even for crude bio-glycerol hydrogenolysis. A series of catalysts with different Ru contents supported on titania were prepared by conventional impregnation (IM) and deposition–precipitation (DP) methods. These catalysts were characterized by X-ray diffraction, temperature programmed reduction, transmission electron microscopy, X-ray photoelectron spectroscopy and CO chemisorption. The catalysts were evaluated for selective hydrogenolysis of glycerol. The glycerol conversion and the selectivity towards 1,2-propanediol depend on the method of catalyst preparation and on the Ru content. The catalyst with low Ru content exhibited maximum conversion, in turn was related to its dispersion. The catalysts prepared by DP method showed stable activity even with crude glycerol containing alkali salts as impurity. The catalyst exhibited consistent activity upon reuse. The high activity of Ru/TiO 2 catalyst is due to the presence of well-dispersed nano size Ru particles on titania. The low activity of the IM catalyst is because of large domains of Ru and because of the presence of residual Cl − ions.