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 reviews of catalytic reactions / Joost Wintterlin -- Adsorption energetics and bonding from femtomole calorimetry and from first ideas idea / 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 technological know-how: what will we study from reviews of oxide-supported cluster version platforms? / H.-J. Freund, M. Bäumer, and H. Kuhlenbeck -- Sum frequency iteration: floor vibrational spectroscopy reviews of catalytic reactions on steel single-crystal surfaces / Gabor A. Somorjai and Keith R. McCrea
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Extra resources for Impact of Surface Science on Catalysis
Structure of the nonreconstructed and the reconstructed Pt(110) surfaces. 52 GERHARD ERTL ation and displacements of the topmost Pt atoms over distances of only a few lattice constants without the need for mass transport over long distances whereby patches of the second layer with (bulk) 1 ϫ 1 structure are exposed (180). Infrared measurements showed that CO occupies exclusively on-top sites on this surface without any change of the C–O stretch frequency associated with the 1 ϫ 2 Ǟ 1 ϫ 1 transition (181).
Small particles exposing different crystal planes are then simply regarded as presenting a superposition of the contributions from different structural elements. Furthermore, it is commonly believed that under steady-state flow conditions the distribution of surface intermediates is constant, independent of time and location. Although these assumptions will generally form a reasonable approximation, closer inspection reveals that additional effects come into play that manifest themselves on the mesoscopic level (and are hence usually hidden) but may affect the macroscopic kinetics.
The speckled region in between marks a zone with a high density of OHad which propagates as reaction front from left to right across the atomic steps. These DYNAMICS OF REACTIONS AT SURFACES 57 FIG. 36. STM snapshot from a Pt(111) surface (165 ϫ 142 nm2) during reaction of a preadsorbed O 2 ϫ 2 structure with hydrogen at 131 K (200). effects are clearly beyond the atomic scale and mark the transition to the mesoscopic level. Effects of this type are always to be expected if the kinetic equations modeling the reaction mechanism are nonlinear, and hence these phenomena have their theoretical basis in the general framework of nonlinear dynamics.