Preparation of ruthenium/iron catalysts supported on carbon
AssigneeBASF Aktiengellsellschaft
InventorsTill Gerlach, Hans-Georg Gobbel, Frank Funke, Klaus Ebel, Ekkehard Schwab, Signe Unverricht, Reinhard Korner, Lisa Lobree
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Abstract
The present invention relates to a process for the preparation of iron-doped ruthenium catalysts supported on carbon, and their use for the selective liquid phase hydrogenation of carbonyl compounds to give the corresponding alcohols, in particular for the hydrogenation of citral to give geraniol or nerol or of citronellal to give citronellol.
Claims14
The process for preparing a ruthenium/iron catalyst supported on carbon, comprising besides 0.1 to 10% by weight of ruthenium on a carbon support 0.1 to 5% by weight of iron, by:
- a) suspending a support in water,
- b) simultaneously adding the catalytically active components ruthenium and iron in the form of solutions of their metal salts,
- c) simultaneously precipitating the catalytically active components onto the support by addition of a base,
- d) separating the catalyst from the aqueous phase of the support suspension,
- e) drying the catalyst,
- f) reducing the catalyst in a hydrogen stream at from 400 to 600° C., and
- g) conditioning the catalyst under low flammability liquids or passivating the catalyst with a dilute oxygen stream.
A process for the preparation of a ruthenium/iron catalyst supported on carbon, comprising besides 0.1 to 10% by weight of ruthenium on a carbon support 0.1 to 5% by weight of iron, by:
- a) suspending a support in water,
- b) simultaneously adding the catalytically active components ruthenium and iron in the form of solutions of their metal salts,
- c) simultaneously precipitating the catalytically active components onto the support by addition of a base,
- d) reducing the catalyst by addition of an aqueous reducing agent,
- e) separation of the catalyst from the aqueous phase of the support suspension, and
- f) washing the catalyst with water.
Dependencies are inferred from the claim text.