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Ruthenium  nanoparticles  supported  on  carbon  black  were  coated  by  mesoporous protective  silica  layers  (Ru/CB@SiO2) with different  textural properties  (SBET: 280–390 m2/g, pore diameter: 3.4–5.0 nm) and were tested in the selective hydrogenation of glucose into sorbitol. The influence of key parameters  such as  the protective  layer pore  size  and  the  solvent nature were investigated.  X‐ray  photoelectron  spectroscopy  (XPS)  analyses  proved  that  the  hydrothermal stability was highly improved in ethanolic solution with low water content (silica loss: 99% in water and 32% in ethanolic solution). In this work, the strong influence of the silica layer pore sizes on the selectivity of the reaction (shifting from 4% to 68% by increasing the pores sizes from 3.4 to 5 nm) was also highlighted. Finally, by adding acidic co‐catalyst (CB–SO3H), sorbitol was obtained directly through  the  hydrolytic  hydrogenation  of  cellobiose  (used  as  a  model  molecule  of  cellulose), demonstrating the high potential of the present methodology to produce active catalysts in biomass transformations.

catalysts

Influence of Water-Miscible Organic Solvent on the Activity and Stability of Silica-Coated Ru Catalysts in the Selective Hydrolytic Hydrogenation of Cellobiose into Sorbitol