Packed silver-catalyst bed doped with phosphorus

US5985786A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Diercks · Schifferstadt, DE
• Bernhard Knuth · Ludwigshafen, DE
• Albrecht Aicher · Bischofswerda, DE

Key dates

• Filing date: Aug 5, 1998
• Grant date: Nov 16, 1999
• Expiry date: Aug 5, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/38
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A phosphorus-doped silver catalyst fixed bed is obtainable by PA1 I. arranging silver crystals obtained by electrolytic deposition of silver from an aqueous silver salt solution to form a starting silver catalyst fixed bed, PA1 II. producing an activated silver catalyst fixed bed from the starting silver catalyst fixed bed by passing through the latter, at from 150 to 800.degree. C., a gas mixture comprising methanol and oxygen (gas mixture M), and PA1 III. bringing the activated silver catalyst fixed bed into contact with from 1 to 20,000 ppm by weight of phosphorus, based on the silver, in the form of a finely divided phosphorus compound having a melting point or decomposition temperature of more than 500.degree. C. (phosphorus compound P).