| 摘要 |
An alumina-free foraminate catalyst is prepared from a copper/aluminium alloy containing initially 40-80 and preferably 50-60 per cent copper by weight; a nickel/aluminium alloy containing 30-62, preferably 30-50 per cent nickel; a cobalt/aluminium alloy containing 15-55, preferably 30-50 per cent cobalt; an iron/aluminium alloy containing 30-55 per cent iron, by treatment with an aqueous alkali solution preferably caustic soda of 0.4-10 per cent strength by weight, passed through the alloy crushed to 1/8 -/ba1/4 inch size at a space velocity above 10 and preferably from 20-30. Without interruption of flow the catalyst is washed preferably at least initially with a space velocity of 10. The activation and washing, and also reactivation, may be effected in the reactor, from 5-30 per cent of aluminium being removed at each reactivation up to a limit of 70 per cent of the initial aluminium content. The catalysts are used for hydrogenation, dehydrogenation, reductive amination and hydrogenolysis; an example of the conversion of isopropanol to acetone is given.
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