Download Advances in Catalysis, Vol. 26 by D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.) PDF

By D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)

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

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8. Scheme of the LEED technique. 9. 5 eV, (c) 160 eV, and (d) 181 eV. diffraction features in LEED (Fig. 9) establishes that the surfaces are ordered on the atomic scale. In addition, the positions and symmetry of the diffraction spots can be used to determine the two-dimensional periodicity of the surface structure. We can imagine for the moment that the surface structure will be rather like the determination of the bulk structure along the crystal plane, although there may be a rearrangement or reconstruction of the surface atoms from the bulk structure.

On the (1 1 1 ) face, the slower dehydro- ACTIVE SITES IN HETEROGENEOUS CATALYSIS 39 genation allows ordering as observed. It is tempting to list the stepped and ( I 1 1) iridium and platinum surfaces according to their ability of breaking C-H and C-C bonds as Ir(S)-[6( 11 1) x (loo)] > Ir(ll1) z Pt(S)-[6(111) x (loo)] > Pt(l11). The surfaces at the two ends of this series are not likely to be versatile catalysts in reactions where C-H and C-C bond dissociations are necessary. The stepped iridium surface would decompose the reactants too rapidly and the residue that forms would block the surface rather well to further chemical reaction.

The stepped Pt [6( 1 11) x (loo)] face reacts readily with all of the adsorbed hydrocarbons and certainly with those that are listed here. The partially dehydrogenated carbonaceous layers that form as a result of dissociated hydrocarbon chemisorption are largely disordered. In contrast, stepped gold surfaces of the same atomic structure remain inert to adsorption of the light hydrocarbon moleculesjust as the Au( 111) crystal face and the chemisorption behavior of the two types of gold surfaces (those with low and high Miller index surfaces) are indistinguishable.

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