Impact of Surface Science on Catalysis by Bruce C. Gates, Helmut Knoezinger

By Bruce C. Gates, Helmut Knoezinger

Content material: Dynamics of reactions at surfaces / Gerhard Ertl -- Theoretical floor technological know-how and catalysis, calculations and ideas / B. Hammer and J.K. Nørskov -- Scanning tunneling microscopy reviews of catalytic reactions / Joost Wintterlin -- Adsorption energetics and bonding from femtomole calorimetry and from first ideas conception / Qingfeng Ge, Rickmer Kose, and David A. King -- lively websites on oxides: from unmarried crystals to catalysts / Hicham Idriss and Mark A. Barteau -- Catalysis and floor technology: what will we examine from stories of oxide-supported cluster version structures? / H.-J. Freund, M. Bäumer, and H. Kuhlenbeck -- Sum frequency new release: floor vibrational spectroscopy stories of catalytic reactions on steel single-crystal surfaces / Gabor A. Somorjai and Keith R. McCrea

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B. INTERACTIONS BETWEEN ADSORBED PARTICLES Interactions between adsorbed particles are ubiquitous and may be either repulsive or attractive. Their physical orgin has been discussed in detail elsewhere (155), and their consequences regarding the variation of the adsorption energy and sticking coefficient with coverage were briefly discussed in the preceding section. With respect to the latter aspect, however, the effect of ‘‘extrinsic’’ precursor kinetics (47, 48) is reemphasized. In contrast to the original Langmuir concept, a particle colliding with an adsorbed species from the gas phase will not experience a hard wall but rather a weakly attractive (van der Waals-type) potential characteristic of the energetics of multilayer adsorption.

Variation of the energy E Ϫ Eo with separation between Oad and C (from COad) referred to large distance. DYNAMICS OF REACTIONS AT SURFACES 49 27) or when an individual CO molecule approaches an isolated Oad atom. The calculated energies of these different configurations are plotted in the lower part of Fig. 27 as a function of the C–O distance and indicate a total activation barrier of 1 eV. 5 eV would have to be surmounted. This is the situation at the island boundaries, where some of the bridging CO molecules from the c4 ϫ 2 phase are close to O atoms.

24 in the form of potential surfaces as a function of two coordinates, namely, the separation between the plane formed by the three H atoms and the N atom (x) and the distance of the N atom from the surface (z). In the ground state the molecule is bound to the surface through the N atom, and the H atoms are directed away from the surface. , the minimum of its potential is at x ϭ 0. Upon excitation from the ground state minimum (Fig. , the umbrella vibration mode of the ammonia molecule becomes excited.

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