The encapsulation of Pd by the supporting TiO2(110) surface induced by strong metal-support interactions

Suzuki, Taku; Souda, Ryūtarō

doi:10.1016/s0039-6028(99)01201-7

Cited by 51 publications

(50 citation statements)

References 19 publications

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“…Prolonged UHV annealing at high temperatures, however, leads to the encapsulation reaction. This was shown for Pt in [11,111,247,259,362,363,370], Pd in [13,329,330,360], Rh in [82,231,316,326,370], Ir in [184], and Ni in [183,328,357].…”

Section: Metalsmentioning

confidence: 65%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

715

651

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Section: Metalsmentioning

confidence: 65%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

715

651

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“…TiO 2 is the prototypic substrate oxide for which this effect has been extensively observed and discussed. [248][249][250][251] The structure of the Ti x O y oxide layer over growing the metal, however, is still under debate. 213,220,[252][253][254][255][256] Another system has therefore been chosen to attempt a deeper understanding of the way SMSI states of catalysts influence the chemistry.…”

Section: Strong Metal Support Interaction (Smsi)mentioning

confidence: 99%

Controlling the charge state of supported nanoparticles in catalysis: lessons from model systems

2018

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Model systems are very important to identify the working principles of real catalysts, and to develop concepts that can be used in the design of new catalytic materials. In this review we report examples of the use of model systems to better understand and control the occurrence of charge transfer at the interface between supported metal nanoparticles and oxide surfaces. In the first part of this article we concentrate on the nature of the support, and on the basic difference in metal/oxide bonding going from a wide-gap non-reducible oxide material to reducible oxide semiconductors. The roles of oxide nanostructuring, bulk and surface defectiveness, and doping with hetero-atoms are also addressed, as they are all aspects that severely affect the metal/oxide interaction. Particular attention is given to the experimental measures of the occurrence of charge transfer at the metal/oxide interface. In this respect, systems based on oxide ultrathin films are particularly important as they allow the use of scanning probe spectroscopies which, often in combination with other measurements and with first principles theoretical simulations, allow full characterization of small supported nanoparticles and their charge state. In a few selected cases, a precise count of the electrons transferred between the oxide and the supported nanoparticle has been possible. Charge transfer can occur through thin, two-dimensional oxide layers also thanks to their structural flexibility. The flow of charge through the oxide film and the formation of charged adsorbates are accompanied in fact by a substantial polaronic relaxation of the film surface which can be rationalized based on electrostatic arguments. In the final part of this review the relationships between model systems and real catalysts are addressed by discussing some examples of how lessons learned from model systems have helped in rationalizing the behavior of real catalysts under working conditions.

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“…Two scenarios could be envisioned: either Fe from the layer(s) underneath the particle migrates through the particle (virtually via alloying), or Fe migrates onto the Pt surface from the surrounding area. Previously, on the basis of high‐energy electron diffraction measurements of Pd/TiO 2 (110), it has been proposed that the encapsulating material is transported by surface migration 16. It should be mentioned, however, that TiO 2 single crystals normally possess extra Ti atoms located in interstitial sites in the bulk that readily migrate towards the surface upon heating 17.…”

mentioning

confidence: 99%