Abstract
The deactivation of platinum catalysts by sulphur has been studied by means of cyclic voltammetry and the effect of this poison on the hydrogenation of maleic acid has been investigated. The toxicity of sulphur for this reaction depends on the olefin concentration. At high concentration, the catalytic activity is proportional to the number of nonpoisoned surface metal atoms, whereas at low concentration the activity decreases greatly and becomes negligible when only 20% of the surface is occupied by sulphur. This result proves that the toxicity of a given poison can be modified according to the experimental conditions and also that the “structure sensitivity” of a catalytic reaction can appear or disappear, depending on the reaction conditions.
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