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

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 concept / 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 can we research from experiences of oxide-supported cluster version structures? / 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 info for Impact of Surface Science on Catalysis

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An STM study of the dissociative chemisorption of NO on Ru(0001) enabled direct identification of the top metal atoms of atomic steps as the active sites for this reaction (171). After exposure to NO, the adsorbed atoms were found close to the steps, and the density of adatoms varied with the widths of the adjacent terraces. 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.

This is manifested as shown in Fig. 36, in which the area with the small bright dots at the right of the image represents the largely unreacted Oad phase with small bright OHad islands, and the large patches at the left arise from an H2Oad island (top) and mixed H2Oad /Oad islands (bottom). 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).

This is manifested as shown in Fig. 36, in which the area with the small bright dots at the right of the image represents the largely unreacted Oad phase with small bright OHad islands, and the large patches at the left arise from an H2Oad island (top) and mixed H2Oad /Oad islands (bottom). 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).

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