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

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

When you consider that 1948, this serial has sought to fill the space among the papers and the textbooks that educate the varied components of catalysis learn. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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Extra resources for Advances in Catalysis, Vol. 28

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SURFACE MOBILITY Whereas adsorbed CO is highly mobile on the surface so that thus far no experimental evidence for kinetic restrictions in the formation of overlayers with long-range order has been obtained, the situation is somewhat different with adsorbed oxygen atoms. Generally no formation of well-developed LEED patterns is observed if the surfaces are exposed to 0, at low temperatures. The need for subsequent annealing indicates the existence of appreciable activation barriers for surface diffusion that is also suggested by theoretical energy profiles of the type as reproduced in Fig.

However, the first-order dependence on 8 at low coverages indicates that in this range the rate-determining step is the transfer of the incorporated oxygen from the oxide to the chemisorbed layer rather than the desorption of the 0, molecule that limits the desorption rate at higher coverages. This behavior is consistent with the mixture of oxygen chemisorption and incorporation that has been discussed above and with the observed coverage dependence of the desorption spectra. A more detailed 38 T.

For coverages beyond the completion of the $ x f i R 30” structure) a Pd(ll1) surface is no longer able to dissociatively adsorb oxygen. Since this is a necessary prerequisite for CO, formation, the reaction is inhibited by CO if its coverage is too high. At lower CO concentrations on the surface oxygen can be co-adsorbed. , the coherence width of the electrons used with this technique. This indicates the existence of repulsive interactions between 0 , d and CO,, . As can be seen from the schematic sketch of Fig.

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