| 摘要 |
In a method for the regeneration and reactivation of a deactivated supported Pt catalyst contained in at least one bed and on which carbonaceous deposits have been accumulated, at least a portion of the carbon is removed at an elevated temperature, e.g. below 566 DEG C., after which a gaseous mixture containing oxygen, steam, chlorine and/or a decomposable chlorine compound, e.g. HCl or trichlorethylene, is passed through the catalyst bed or beds at an elevated temperature in a first step, the molar ratio of steam to chlorine in the gaseous mixture being such as to provide an equilibrium chlorine content of at least about 0,5% by weight on an upstream portion of the catalyst bed or beds based on this catalyst portion, the first step being continued until the amount of chlorine deposited on the upstream portion of the catalyst is substantially equivalent to the theoretical amount required to bring the total catalyst to the desired level, whereafter in a second step the steam to chlorine ratio in the gaseous mixture is increased to a value substantially not higher than that which gives the desired final equilibrium chlorine content on the catalyst, this second step being continued until the total catalyst is substantially at equilibrium. An example is given.
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