骨架镍催化剂的制备过程对催化活性的影响

Influence of preparation process on catalytic activity of nickel skeleton catalyst

骨架镍催化剂的制备过程对其催化活性的影响很大,试验表明,根据不同粒度分阶段控制合金展开的反应温度和反应时间,如合金展开第二阶段的温度不能高于100℃以防止反应过热,尽量缩短反应时间;反应过程中应保持一定的压力;采用多段碱液溶出工艺并保持催化剂中的残留铝ω为4％～6％,可制得活性较高的骨架镍催化剂。

The influence of the preparation process on the activity of nickel skeleton catalyst has been studied. The test results show that in order to avoid the reaction overheat such as keeping the temperature less than 100 C at the second stage and reduce the reaction time, the reaction temperature and the reaction time are controlled in stages according to the different particle size of the alloy. A proper pressure should be kept during the reaction. The nickel skeleton catalyst with high activity can be prepared by using the process of multi--stage disso- lution with alkali solution and keeping mass fraction of residual aluminium in the catalyst to be 4%--6%.