| 摘要 |
<p>PCT No. PCT/EP96/00901 Sec. 371 Date Sep. 15, 1997 Sec. 102(e) Date Sep. 15, 1997 PCT Filed Mar. 4, 1996 PCT Pub. No. WO96/28249 PCT Pub. Date Sep. 19, 1997A 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 DEG C. (phosphorus compound P).</p> |
