Process for preparing phosphorus-doped silver catalysts
AssigneeBASF SE
InventorsRainer Diercks, Gunther Schonaich
Life of this patent
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Abstract
A process for preparing phosphorus-doped silver catalysts from silver contaminated with phosphorus compounds, which comprises a) heating the silver which is contaminated with phosphorus compounds to temperatures at which the silver is liquid and subsequently cooling to temperatures below the melting point, b) preparing silver crystals from the silver obtained in stage a) by anodically oxidizing it to silver ions in an electrolysis cell with an aqueous electrolyte, and cathodically reducing the silver ions again to elemental silver, and c) contacting the silver crystals with a finely divided phosphorus compound with a melting point or decomposition temperature above 500.degree. C. (phosphorus compound P).
Claims10
A process for preparing phosphorus-doped silver catalysts from silver contaminated with phosphorus compounds, which comprises
- a) heating said silver which is contaminated with phosphorus compounds to temperatures at which said silver is liquid and subsequently cooling to temperatures below the melting point,
- b) preparing silver crystals from the silver obtained in stage a) by anodically oxidizing it to silver ions in an electrolysis cell with an aqueous electrolyte, and cathodically reducing the silver ions again to elemental silver, and
- c) contacting the silver crystals with a finely divided phosphorus compound (P), wherein said compound (P) has a melting point or decomposition temperature above 500.degree. C.
Dependencies are inferred from the claim text.