By Bruce C. Gates, Helmut Knoezinger
Content material: Dynamics of reactions at surfaces / Gerhard Ertl -- Theoretical floor technology and catalysis, calculations and ideas / B. Hammer and J.K. Nørskov -- Scanning tunneling microscopy experiences of catalytic reactions / Joost Wintterlin -- Adsorption energetics and bonding from femtomole calorimetry and from first rules concept / Qingfeng Ge, Rickmer Kose, and David A. King -- energetic websites on oxides: from unmarried crystals to catalysts / Hicham Idriss and Mark A. Barteau -- Catalysis and floor technological know-how: what will we research from reviews of oxide-supported cluster version structures? / H.-J. Freund, M. Bäumer, and H. Kuhlenbeck -- Sum frequency iteration: floor vibrational spectroscopy experiences of catalytic reactions on steel single-crystal surfaces / Gabor A. Somorjai and Keith R. McCrea
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Hence, it was inferred that NO molecules trapped on the terraces rapidly diffuse across the surface and eventually become dissociated at steps. In addition, the hcp Ru(0001) surface offers two types of alternating steps. As illustrated in Fig. 31, a metal 50 GERHARD ERTL FIG. 31. The role of monoatomic steps on a Ru(0001) surface as active sites in dissociating NO. O atoms formed at step I are strongly held there and inhibit further reaction, whereas they diffuse away from step II (171). atom at a type I step has one neighbor at the bottom of the step, whereas at a type II step it has two.
In general it is concluded that the continuous bombardment of adsorbatecovered surfaces with particles from the gas phase (even if their mean kinetic energy is low) under the high-pressure conditions of practical catalysis might be of nonnegligible influence on the kinetics beyond the simple concepts of independent adsorption and desorption processes. There is possibly another cause of the difference between high- and low-pressure studies, and early reports (90) according to which reaction rates may be affected by the presence of inert gases surely deserve reexamination.
DYNAMICS OF REACTIONS AT SURFACES 31 gains by transferring this electron to the Fermi level of W (work function տ 5 eV). It clearly demonstrates the possibility for adiabatic charge transfer in a gas–surface reaction. Less obvious, however, is the interpretation of other earlier observations, according to which interaction of oxygen (and other electronegative molecules) with alkali metal surfaces may cause the emission of electrons (92), the origin of which must be attributed to the energy gain associated with the chemical transformation of the surface.