| 摘要 |
Finely divided nickel is prepared by grinding a mixture of basic nickel carbonate or organic salt of nickel and boric acid or oxide, heating the mixture in hydrogen to 400 to 500 DEG C. in the space of 60 to 150 minutes and maintaining such temperature for about 20 minutes, lowering the temperature rapidly to a value which is less than 150 DEG C. but above atmospheric temperature within 10 minutes, replacing the hydrogen atmosphere with a mixture of hydrogen and an inert gas until the temperature descends to room temperature, interrupting the supply of hydrogen and passing an inert gas often the product for at least 6 hours. 10 to 50 parts of such nickel and 50 to 90 parts of nickel in a less finely divided state e.g. ex carbonyl are subjected to compression and sintering in hydrogen at 350 and 550 DEG C.ALSO:In a process for the preparation of a hydrogenation catalyst, a mixture of basic nickel carbonate or organic salt of nickel and boric acid or oxide are ground, heated in hydrogen up to 400-500 DEG C. during 60 to 150 minutes (the heat being maintained for 20 minutes), thereafter cooled to less than 150 DEG C. but greater than atmospheric temperature during 10 minutes, subjected to inert gas plus hydrogen in place of hydrogen until the temperature descends to atmospheric and the inert gas alone passed over the catalyst for at least 6 hours. The ground mass preferably passes 37 mesh (AFNOR), has surface area of at least m2/gm., and at least 150 cm3 hydrogen per gm. |
