Benzene hydrogenation on platinum and iridium catalysts. Variation of the toxicity of sulfur with the nature of the support

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Benzene hydrogenation was studied at 323 K on fresh and sulfurized catalysts. The activity of small platinum and iridium particles was sensitive to the electronic properties of the metal, which, in turn, depended on the acidity of the support. The toxicity of sulfur, which varies with both the nature of the metal and the support, can be explained by the combination of geometric (negative) and electronic (negative or positive) effects.