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.)

Seeing that 1948, this serial has sought to fill the space 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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Naphthalene, however, adsorbs on both gold surfaces, and the adsorption behavior indicates dissociative chemisorption. The hydrocarbon fragments that form are strongly bound. These results indicate that while chemisorption of hydrocarbons on platinum surfaces requires little or no activation energy, chemisorption on gold has large enough activation energy for most hydrocarbons to prevent adsorption at the low pressures ( l o p 6Torr) and temperatures ( <550°C) studied. While the activation energy for surface reactions such as the rupture of C-H and C-C bonds is greatly reduced at atomic steps on the platinum surface, this effect is not at all apparent on gold surfaces.

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.

26 G . A. SOMOFUAI cup in the reaction chamber. The effect of adding an impurity or a second constituent (alloying) to the surface on the reactivity can also be studied in this system. The second constituent may be vaporized at low ambient pressure onto the surface of the crystalline sample from an external vapor source until the desired surface composition is obtained. The crystal surface can be cleaned by ion bombardment, which is also available as an attachment on the reaction chamber. This and similar instruments ( 3 , 4 ) that allow one to study reaction rates and product distributions on small-area crystal and catalyst surfaces have been used in our studies of the mechanism of heterogeneous catalysis and the nature of active sites.

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