By Werner O. Haag, Bruce C. Gates, Helmut Knoezinger
Due to the fact 1948, this sequence has crammed the space among the papers that file on and the textbooks that educate within the assorted parts of catalysis learn. The editors of and participants to Advances in Catalysis are devoted to recording growth during this zone. each one quantity of Advances in Catalysis comprises articles protecting a subject matter of large curiosity. Advances in Catalysis forty four displays the increasing impression of experimental floor characterization at the figuring out of catalysis. The catalysts emphasised listed here are consultant of the complexity of brand new know-how; examples comprise catalysts for hydrocarbon re-forming, car exhaust conversion, and hydroprocessing to make clean-burning fossil fuels. This quantity comprises 3 obituaries spotting the most important contributions of Dr. Werner O. Hagg, Dr. Charles Kemball, and Dr. John Turkevich.
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Extra resources for Advances in Catalysis, Vol. 44
9, when going from Rh to Pd to Ag, the work functions vary much less than the densities of state at the Fermi energy. ’s (8) famous paper on the reactivity of aromatic hydrocarbons, NMR AS PROBE OF SURFACES OF SUPPORTED METAL CATALYSTS 17 FIG. 10. Local density of states on different atomic layers in a seven-layer tungsten slab. The (calculated) Fermi level is shown by the dotted line. Note that the two deepest layers have very similar LDOS curves but that the surface LDOS is markedly different.
5, right). The quantity plotted along the vertical axis is the ratio N(E, x)/n(x) for several values of x. Negative x are inside the solid and positive are outside. The dashed vertical lines show the LDOS of states near the Fermi level, normalized by the electron charge density; n(x) falls exponentially outside the surface. A large fraction of the charge outside the surface is due to Fermi-level electrons. [Reproduced with permission from Werner et al. (27). ] NMR AS PROBE OF SURFACES OF SUPPORTED METAL CATALYSTS 13 FIG.
This simply expresses the continuity of the electrostatic potential due to the outside sources at the surface of a conductor. Similar arguments can be used to show that the addition of electrons from the outside, which according to electrostatics will appear at 12 J. J. VAN DER KLINK the surface of the metal, have no effect on the work function, as long as their number is too small to change the Fermi energy. This is clear for a macroscopic (even if not semi-infinite) crystal, but we may wonder about the limit in size to which it will remain valid: What is the work function of a nanocrystal?
Advances in Catalysis, Vol. 44 by Werner O. Haag, Bruce C. Gates, Helmut Knoezinger