abstract |
The present invention relates to novel ruthenium catalysts obtainable by: i) one or more treatment of a support material based on amorphous silicon dioxide with a halogen-free aqueous solution of a low molecular weight ruthenium compound and subsequent drying of the treated support material at a temperature below 200 ° C., ii) reduction of the solid obtained in i) with hydrogen at a temperature in the range of 100 to 350 ° C, wherein one carries out and step ii) immediately after step i), a process for their preparation and their use for the catalytic hydrogenation of mono- and disaccharides in the production of sugar alcohols, except sorbitol. |