| 摘要 |
Stabilisation of a reduced cop- per catalyst by a) passivating the cat- alyst by passing a gas stream that is free of reducing gases and which contains 0.05 to 0.5 % by volume of oxygen and an amount of carbon dioxide at least twice the amount of oxygen through a bed of the cata- lyst until the catalyst is passivated, the proportion of oxygen in said gas stream and the temperature at which it is fed to the bed being such that the temperature of the catalyst does not rise to above 100.degree.C during said pas- sivation step, and then b) increasing the oxygen content of the gas pass- ing through the bed until the oxygen partial pressure corresponds to that of air at atmospheric pressure. The process may be applied to the stabil- isation of fresh reduced catalysts or to the stabilisation of used, e.g. spent catalysts, before discharge thereof from a reactor.
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