| 摘要 |
PCT No. PCT/EP97/01617 Sec. 371 Date Oct. 8, 1998 Sec. 102(e) Date Oct. 8, 1998 PCT Filed Apr. 1, 1997 PCT Pub. No. WO97/37758 PCT Pub. Date Oct. 16, 1997A hydrogenation catalyst is prepared by reduction of platinum in an oxidation state of not less than two using a reducing agent in an aqueous medium in the presence of a carbon-containing support after partial poisoning, where use is made of a compound of the general formula I where X, Y and Z can be identical or different and are hydrogen, C1-C18-alkyl, C5-C10-cycloalkyl, halogen, hydroxyl, C1-C6-alkoxy and -NR'R'', where R, R' and R'' can be identical or different and can be hydrogen, C1-C18-alkyl or C5-C10-cycloalkyl. Such a hydrogenation catalyst can be used for preparing hydroxylammonium salts and the process for preparing the above catalysts can also be used for regenerating hydrogenation catalysts based on platinum.
|
