Thermodynamic insights into strong metal–support interaction of transition metal nanoparticles on titania: simple descriptors for complex chemistry

Wang, Xing; Beck, Arik; Bokhoven, Jeroen A. van; Palagin, Dennis

doi:10.1039/d0ta11650e

Cited by 26 publications

(18 citation statements)

References 62 publications

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“…It has to be noted that the formation of an SMSI overlayer around the platinum nanoparticles due to high-temperature reduction is very likely to occur. ,, Such an overlayer will influence the behavior of hydrogen adsorption and spillover. The degree of overlayer formation and its structure are a complex function of temperature and hydrogen pressure.…”

Section: Discussionmentioning

confidence: 99%

Influence of Hydrogen Pressure on the Structure of Platinum–Titania Catalysts

et al. 2021

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Dependent on the application or characterization method catalysts are exposed to different gas pressures, which results in different structures. The quantitative determination of the structure and composition of a catalyst as a function of its gas environment allows the establishment of structure−performance relationships. Herein, we determine the structure of a platinum− titania catalyst under hydrogen during temperature-programmed reduction over 3 orders of magnitude in pressure, from 1 to 950 mbar. The pressure significantly influences the hydrogen uptake kinetics and the consecutive structural transformations of the platinum−titania catalyst. The reduction of the platinum precursor becomes pressure-independent above 30 mbar. Yet, the related spillover and stability of adsorbed hydrogen on the titania are a function of pressure. Higher pressures promote higher hydrogen uptake and prevent desorption of hydrogen from the catalyst. The hydrogen uptake triggers a phase transformation of anatase to rutile which is, as a result, pressure dependent. The presented systematic approach establishes a pressure−structure relation which can be applied for the catalyst treatment and to frame existing results on the catalytic system. Treating the same material at two different pressures will lead to different structures.

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Section: Discussionmentioning

confidence: 99%

Influence of Hydrogen Pressure on the Structure of Platinum–Titania Catalysts

et al. 2021

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“…Originally, the chemisorption suppression was attributed to an electronic perturbation of the system, that is, the bonding between Pt and Ti cations under reducing atmospheres. Subsequent studies showed that in situ reductive activation leads to encapsulation of Pt NPs in a thin, partially reduced layer of TiO 2 (4)(5)(6)(7)(8)(9)(10). The driving force for this socalled strong metal-support interaction (SMSI) state was attributed to surface energy minimization (11).…”

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Dynamic interplay between metal nanoparticles and oxide support under redox conditions

Frey

Beck

Huang

et al. 2022

Science

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The dynamic interactions between noble metal particles and reducible metal-oxide supports can depend on redox reactions with ambient gases. Transmission electron microscopy revealed that the strong metal-support interaction (SMSI)–induced encapsulation of platinum particles on titania observed under reducing conditions is lost once the system is exposed to a redox-reactive environment containing oxygen and hydrogen at a total pressure of ~1 bar. Destabilization of the metal–oxide interface and redox-mediated reconstructions of titania lead to particle dynamics and directed particle migration that depend on nanoparticle orientation. A static encapsulated SMSI state was reestablished when switching back to purely oxidizing conditions. This work highlights the difference between reactive and nonreactive states and demonstrates that manifestations of the metal-support interaction strongly depend on the chemical environment.

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“…Low formation energy contributes to electron transfer, which improves the stability and SMSI of the gas sensing catalyst. 55 In addition, relative humidity (RH) is another important factor that can be explored to affect the gas sensing performance of the sensor. [56][57][58] As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous titanium niobium nitrides supported Pt nanoparticles for highly selective and sensitive formaldehyde sensing

Huang

Adimi

et al. 2021

J. Mater. Chem. A

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Thermodynamic insights into strong metal–support interaction of transition metal nanoparticles on titania: simple descriptors for complex chemistry

Abstract: Using ab initio modelling, we demonstrate that a simple parameter – alloy formation energy – is a good descriptor of an interaction strength between metal substrates and oxide monolayers, which allows constructing structure–material–environment maps.

Cited by 26 publications

References 62 publications

Influence of Hydrogen Pressure on the Structure of Platinum–Titania Catalysts

Influence of Hydrogen Pressure on the Structure of Platinum–Titania Catalysts

Dynamic interplay between metal nanoparticles and oxide support under redox conditions

Mesoporous titanium niobium nitrides supported Pt nanoparticles for highly selective and sensitive formaldehyde sensing

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