| 摘要 |
<p>A process for reactivating platinum catalysts is disclosed. It comprises treating a platinum catalyst having reduced activity and selectivity A. IN A FIRST STAGE WITH AN ACID SOLUTION OF A SULFUR COMPOUND WHICH LIBERATES SULFUROUS ACID IN ACID MEDIUM, AND A HYDROXYLAMMONIUM SALT, SAID TREATMENT BEING CONDUCTED IN THE ABSENCE OF OXIDIZING AGENTS CAPABLE OF OXIDIZING SULFUROUS ACID TO SULFATE, AND B. IN A SECOND STAGE WITH AN ACID SOLUTION OF PLATINUM (II) or platinum (IV) compounds in the presence of hydrogen.</p> |
