| 摘要 |
Dehydrogenation catalyst, used in the mfr. of hydroxydiphenyl is prepd by (1) preparing a catalytic mass contg. Ni, Cr, Al and Cu as their carbonates, chromates or hydroxides in ratio 40-60:6.8-17.1:1.6-8.0:0.05-1.0, (2) impregnating this mass with an alkaline sulphate or carbonate soln so that alkali metal to Ni ratio is 0.6-3.4:40-60, (3) moulding this mass to give pellets of density 0.8-1.6 g/ml and (4) reducing the pellets in two stages, firstly heating at 350-420 degrees C with twice the H2 reqd. to reduce the Ni and also the Cr in 1-4 hrs. leaving the pellets for at least a week and then treating with 2-10 times H2 reqd. to reduce the Ni. With this catalyst high yields of hydroxydiphenyl are obtd. over long period of time. |
