A molecular orbital study of strong metal-support interaction between platinum and titanium dioxide

Horsley, J. A.

doi:10.1021/ja00505a011

Cited by 305 publications

(147 citation statements)

References 3 publications

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“…Easily reducible oxides such as TiO 2 , Nb 2 O 5 , and V 2 O 3 show SMSI behavior, whereas less easily reducible oxides as Sc 2 O 3 , ZrO 2 or HfO 2 or the main group oxides Al 2 O 3 and SiO 2 show no changes in their chemisorption behavior up to 773 K [4]. Electron microscopic observations with Pt/TiO 2 model catalysts showed evidence for the formation of Ti 4 O 7 species after elevated reduction temperatures (975 and 1025 K) [8,9] and gave rise to cluster model calculations [10]. They produced the energetically most favorable results for the assumption of a direct Pt-Ti bond and a formal charge of +3 at the titanium ion.…”

Section: Supported Metal Catalystsmentioning

confidence: 78%

Strong metal–support interactions on rhodium model catalysts

Linsmeier

Taglauer

2011

Applied Catalysis A: General

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Reactive processes on catalyst surfaces are studied in this work for Rh/metal oxide model systems by means of surface science techniques. Published results in the literature deal with titania, alumina, and silica as support materials and are briefly reviewed. For the present studies Rh/Al 2 O 3 and Rh/TiO 2 model catalysts with about one monolayer Rh coverage are specially prepared and analyzed by ion scattering spectroscopy, X-ray photoelectron spectroscopy, and thermal desorption measurements as main techniques. In part these measurements are supported by a variety of other analytical and imaging techniques. For thermal treatment in hydrogen atmosphere at low and elevated pressures a complete Rh encapsulation by titania is observed for temperatures above 773 K. The results from ion bombardment depth profiling are corroborated by the concomitant drastic reduction of the CO adsorption capacity of these samples. The model catalysts thus exhibit the typical features of 'strong metal-support interaction'. The effect was not found for alumina supports, for which thermal treatments mainly resulted in gradual interdiffusion of the various surface species. These results also demonstrate that characteristic catalyst behavior can be successfully studied by applying surface science methods to model catalysts.

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Section: Supported Metal Catalystsmentioning

confidence: 78%

Strong metal–support interactions on rhodium model catalysts

Linsmeier

Taglauer

2011

Applied Catalysis A: General

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“…14,18,19 Furthermore, all studies on Au, Pt/TiO 2 have considered the adsorption of single or a few atom metal clusters on some specific sites of the TiO 2 surface. While these studies have provided useful information on the structural energetics of metal/support system, a microscopic understanding of the interaction occurring between the metal particles and the TiO 2 surface also requires calculations for their surface diffusion profiles on the stoichiometric and oxygen deficient surfaces.…”

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confidence: 99%

Adsorption and diffusion of Pt and Au on the stoichiometric and reducedTiO2rutile (110) surfaces

et al. 2005

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A comparative first principles pseudopotential study of the adsorption and migration profiles of single Pt and Au atoms on the stoichiometric and reduced TiO 2 rutile (110) surfaces is presented.Pt and Au behave similarly with respect to (i) most favorable adsorption sites, which are found to be the hollow and substitutional sites on the stoichiometric and reduced surfaces, respectively, (ii) the large increase in their binding energy (by ∼ 1.7 eV) when the surface is reduced, and (iii) their low migration barrier near 0.15 eV on the stoichiometric surface. Pt, on the other hand, binds more strongly (by ∼ 2 eV) to both surfaces. On the stoichiometric surface, Pt migration pattern is expected to be one-dimensional, which is primarily influenced by interactions with O atoms. Au migration is expected to be two-dimensional, with Au-Ti interactions playing a more important role. On the reduced surface, the migration barrier for Pt diffusion is significantly larger compared to Au.

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“…In our opinion, at this temperature on the one hand, the sufficient modification of the energy gap of TiO 2 is reached, on the other, one platinum is completely reduced and shows relatively high sorption capacity to CO. After reduction at temperatures higher than 500°C, CO adsorption was very low (Table 1). It is also worth noting that the reduction at a high temperature can lead to the formation of strong metal-support interactions (SMSI)-the phenomenon well known and repeatedly reported [36][37][38]. SMSI occurs in the catalysts supported on easily or moderately reducible oxides and causes a decrease in the CO sorption capacity of the catalysts.…”

Section: The Activity Tests and Overall Discussionmentioning

confidence: 99%

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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This paper reports that Pt/TiO 2 and to some extent, Pt/Al 2 O 3 and Pt/SiO 2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (\ 100°C) in the absence of oxygen. For Pt/TiO 2 catalysts, CO conversion is dependent on the Pt loading as well as the temperature of their reduction. There are an optimal platinum loading (5 wt%) and catalyst reduction temperature (500°C) ensuring the best photocatalytic efficiency. Catalytic performance results from the combined effects of electron-hole photogeneration and partial photodesorption of CO from the platinum surface, followed by the adsorption and subsequent dissociation of H 2 O. The probable mechanism of photooxidation of CO by H 2 O was proposed.

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A molecular orbital study of strong metal-support interaction between platinum and titanium dioxide

Cited by 305 publications

References 3 publications

Strong metal–support interactions on rhodium model catalysts

Strong metal–support interactions on rhodium model catalysts

Adsorption and diffusion of Pt and Au on the stoichiometric and reducedTiO2rutile (110) surfaces

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

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