By D.D. Eley, Herman Pines, Paul B. Weez (Eds.)

ISBN-10: 0120078287

ISBN-13: 9780120078288

Considering the fact that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various components of catalysis examine. This quantity contains articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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ERTL 32 (a) (b) FIG. 25. Structural model for the adsorption of oxygen on Ir(ll0) showing (a) the geometrical arrangement and (b) the bond distances involved in the binding (145). 25 monolayers of oxygen, yields a c2 x 2 pattern. This pattern has been the subject of a recent LEED intensity analysis (145). As for oxygen adsorption on Ni( 110) (157), the oxygen is found to be adsorbed in a short-bridged site as is shown in Fig. 25. This site allows a closer approach of the Iridium atoms involved in the bonding and also a more favorable bond angle for the Ir-0-Ir complex (145).

In the latter case the adsorption energy was found to vary between 80 and 48 kcal/mol with increasing coverage which is similar to the TDS data derived for Ir( 1 10) (124). Since oxygen always desorbs in the molecular form the strength of the ' CATALYTIC OXIDATION OF CO ON PLATINUM METALS 39 FIG. 31. Variation of the activation energy with coverage for the thermal desorption of oxygen from Ir(ll0) (124). M-0 bond, EM-o, is simply related with the adsorption energy, Ead,and , = 1 19 kcal/mol, through the dissociation energy of 0 2 Ed EM-o= t(Ead4- Ed).

Similarly, XPS spectra show no marked differences in the 1s oxygen peak for the two forms of oxygen (124). However, substantial changes are observed in the valence bands as can be seen in the UPS spectra for oxygen interaction with Ir(ll1) (129) shown in Fig. 21. Initial adsorption of 0, in an ordered 2 x 2 structure leads primarily to increased emission near 6 eV below the Fermi level. Further oxygen uptake leading to two wellordered oxide states (129) leads to increased structure in the oxygen 2p region and a pronounced reduction in the d-band emission from a metal to an oxide.

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Advances in Catalysis, Vol. 28 by D.D. Eley, Herman Pines, Paul B. Weez (Eds.)

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