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Coloma, Fernando; Coronado, Juan M.; Rochester, Colin H.; Anderson, James A.

doi:10.1023/a:1019069925240

Cited by 45 publications

(55 citation statements)

References 28 publications

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“…There are suggestions that decoration begins preferentially at extended terrace type facets [32]. A further point to note is the stability of the reduced overlayer.…”

Section: Resultsmentioning

confidence: 99%

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

2007

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Pd/TiO 2 catalysts were found to enter an strong metal support interaction (SMSI) state after reduction at temperatures as low as 473 K. This was identified as a significant loss in the CO uptake as monitored by low temperature FTIR. Electron microscopy provides direct evidence of the presence of ordered, reduced titanium oxide layers over palladium (SMSI state) for Pd/TiO 2 catalysts following reduction at temperature 623 K. The crystal phase was identified as Ti 4 O 7 and this phase, once formed, was found to be stable even after exposure to atmospheric conditions. KEY WORDS: low temperature induced SMSI; electron microscopy; low temperature FTIR; Ti 4 O 7 .

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“…There are suggestions that decoration begins preferentially at extended terrace type facets [32]. A further point to note is the stability of the reduced overlayer.…”

Section: Resultsmentioning

confidence: 99%

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

2007

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“…Furthermore, small metal particles possess low Pt coordination and CO adsorption on these sites is characterized by lower wavenumbers [67,68]. The presence of this band at lower wavenumbers in the pure ceria catalyst could be associated to the presence of small nanoparticles together with the presence of defect sites at the metal-support interface which are able to tilt CO adsorption [69]. On the contrary, the peak at 2055 cm -1 in the niobium-ceria supported catalyst could be associated to the presence of more coordinated Pt atoms.…”

Section: Co Prox: Effect Of Co 2 and H 2 O In The Feedmentioning

confidence: 99%

Preferential oxidation of CO in excess of H2 on Pt/CeO2–Nb2O5 catalysts

Jardim

Rico-Francés

Coloma

et al. 2015

Applied Catalysis A: General

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“…There are several peaks in the 1900-2250 cm −1 range and in general they have been associated with different bonding configurations of -CO species on TiO 2 and other surfaces. 36,40,[42][43][44][45][46] Of these peaks, the ones at 2189 and 2203 cm −1 also offer information on a possible film texture difference resulting from the varying thermal treatments; the band at ∼2203 cm −1 is associated with CO adsorbed on Ti with very low coordination most likely on steps and edges and the band around 2189 cm −1 with CO adsorbed on Ti on flat (101) surfaces. 43 The validity of this assumption will be examined in detail later.…”

Section: Ecs Journal Of Solid State Science and Technology 4 (8) P29mentioning

confidence: 99%

Stability and Surface Reactivity of Anatase TiO₂Films

Henegar

Gougousi

2015

ECS J. Solid State Sci. Technol.

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Atomic Layer Deposition has been used to deposit a series of TiO 2 films on native oxide Si(100) at temperatures ranging from 100 to 300 • C using tetrakis(dimethylamino) titanium and H 2 O. The films were subjected to post-deposition thermal treatment and their structure, morphology and composition was examined. As-deposited films were amorphous and began to crystallize after thermal treatment at 500 • C. The films deposited at 100 • C and treated thermally at temperatures up to 900 • C for 10 min crystallized exclusively in the anatase phase forming crystallites with lateral size in excess of 200 nm. The films deposited at higher temperatures formed rutile crystallites with no mixing of the two phases. The films containing anatase grains exhibited significantly higher surface activity as evidenced by the detection of surface bound species such as carbonates (CO), carbon-nitrogen (CN) and nitrosyls. Although 100 • C is not within the ALD window for optimal film growth, it appears that the poor film adhesion to the substrate as well as the low film density and possibly the presence of carbon containing impurities result in the stabilization of anatase crystallites with lateral size at least one order of magnitude higher than it is widely reported in the literature.

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Untitled

Cited by 45 publications

References 28 publications

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

Preferential oxidation of CO in excess of H2 on Pt/CeO2–Nb2O5 catalysts

Stability and Surface Reactivity of Anatase TiO₂Films

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Untitled

Cited by 45 publications

References 28 publications

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

Imaging of low temperature induced SMSI on Pd/TiO2 catalysts

Preferential oxidation of CO in excess of H2 on Pt/CeO2–Nb2O5 catalysts

Stability and Surface Reactivity of Anatase TiO2Films

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Stability and Surface Reactivity of Anatase TiO₂Films