Abstract
The coke deposition during the reaction of cyclopentane has been investigated on Pt-Re/Al 2O 3 and Pt-Ir/Al 2O 3 catalysts. It appears that the amount of coke deposited on the catalyst is lowered by the addition of Ir or Re to Pt. On the other hand, the amount of coke oxidizable at low temperature (deposited on the metal) decreases in the order Pt-Re > Pt > Re > Pt-Ir > Ir. Nevertheless, toxicities of those carbonaceous deposits for catalytic hydrogenation reaction are the lowest on Pt-Re and the highest on Pt-Ir. These results can be explained by a ligand effect which can stabilize the adsorption of coke precursor or by a change in the nature of the coke.
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