Oxidation of CO on Iridium

The catalytic oxidation of CO on iridium has not been as extensively studied as with palladium and platinum. However, as for these metals, both steady-state (40, 54, 124, 199-202) and nonsteady-state investigation (124, 200-203) have been carried out on both polycrystalline and single crystal surfaces. As the results are for the most part very similar to those obtained on palladium and platinum surfaces, only those results that shed additional light on the kinetics and mechanism basic to the reaction will be emphasized here. 

In conclusion, a qualitatively similar behavior to that of Pd and Pt is found with iridium. Whether the activation energy for the LH reaction under comparable conditions is indeed appreciably lower with Ir than with the other two metals needs, however, some further clarification. 

---