Ruthenium catalysts on a s102-based carrier material for catalytic hydrogenation of saccharides
AssigneeBASF SE
InventorsDominic Vanoppen, Melanie Maas-Brunner, Ulrich Kammel, Jan-Dirk Arndt
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Abstract
Novel ruthenium catalysts can be obtained by: i) treating a support material based on amorphous silicon dioxide one or more times with a halogen-free aqueous solution of a low molecular weight ruthenium compound and subsequently drying the treated support material at below 200° C., ii) reducing the solid obtained in i) by means of hydrogen at from 100 to 350° C., where step ii) is carried out directly after step i). These catalysts can be used for the catalytic hydrogenation of monosaccharides and disaccharides to produce sugar alcohols, with the exception of sorbitol.
Claims15
A ruthenium catalyst, obtainable by:
- i) treating a support material based on amorphous silicon dioxide one or more times with a halogen-free aqueous solution of a low molecular weight ruthenium compound and subsequently drying the treated support material at below 200° C.,
- ii) reducing the solid obtained in i) by means of hydrogen at from 100 to 350° C.,
- where step ii) is carried out directly after step i), wherein the ruthenium content in the catalyst is from 0.1 to 5% by weight, based on the support material.
A ruthenium catalyst as claimed in any of the preceding claims, wherein the support material based on silicon dioxide comprises at least 90% by weight of silicon dioxide and less than 1% by weight of aluminum oxide, calculated as A12O3.
A ruthenium catalyst as claimed in any of the preceding claims, wherein the ruthenium compound used in step i) is selected from among ruthenium(III) nitrosyl nitrate, ruthenium(III) acetate, sodium ruthenate(IV) and potassium ruthenate(IV).
A ruthenium catalyst as claimed in any of the preceding claims, wherein the solid which is obtained from i) and is used for the reduction ii) has a water content of less than 5% by weight, based on the total weight of the solid.
A ruthenium catalyst as claimed in any of the preceding claims, wherein drying in step i) is carried out with the treated support material being kept in motion.
A ruthenium catalyst as claimed in any of the preceding claims, containing less than 0.05% by weight of halogen, based on the total weight of the catalyst, and comprising:
- a support material based on amorphous silicon dioxide and
- elemental ruthenium in an amount of from 0.1 to 5% by weight, based on the weight of the support material, which is present in atomically disperse form and/or in the form of ruthenium particles on the support,
- where the catalyst contains essentially no ruthenium particles and/or agglomerates having diameters above 10 nm.
A process for producing a ruthenium catalyst as claimed in any of the preceding claims, which comprises the following steps:
- i) treating a support material based on amorphous silicon dioxide one or more times with a halogen-free aqueous solution of a low molecular weight ruthenium compound and subsequently drying the treated support material at below 200° C.,
- ii) reducing the solid obtained in i) by means of hydrogen at from 100 to 350° C.,
- where step ii) is carried out directly after step i).
Dependencies are inferred from the claim text.