2020
DOI: 10.1038/s41467-020-17070-2
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Abstract: Heterogeneous catalysts play a pivotal role in the chemical industry. The strong metalsupport interaction (SMSI), which affects the catalytic activity, is a phenomenon researched for decades. However, detailed mechanistic understanding on real catalytic systems is lacking. Here, this surface phenomenon was studied on an actual platinum-titania catalyst by state-of-the-art in situ electron microscopy, in situ X-ray photoemission spectroscopy and in situ X-ray diffraction, aided by density functional theory calc… Show more

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Cited by 154 publications
(222 citation statements)
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References 55 publications
(59 reference statements)
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“…In general, applications focus on the morphological and structural evolution of catalysts under reactive conditions that mimic gas compositions, pressure and temperatures relevant to the water gas shift [96], ethylene hydrogenation [94], CO 2 reduction [97] and CO oxidation [23,24,[98][99][100][101] reactions. Nanoreactors have also been used to investigate the catalyzed growth of materials such as carbon nanostructures [102,103] and the occurrence of strong metal-support interactions (SMSI) [77,104]. Examples of in situ TEM results acquired with gas cell TEM holders are shown in Fig.…”
Section: Gas Cells-on the Relevance Of In Situ Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In general, applications focus on the morphological and structural evolution of catalysts under reactive conditions that mimic gas compositions, pressure and temperatures relevant to the water gas shift [96], ethylene hydrogenation [94], CO 2 reduction [97] and CO oxidation [23,24,[98][99][100][101] reactions. Nanoreactors have also been used to investigate the catalyzed growth of materials such as carbon nanostructures [102,103] and the occurrence of strong metal-support interactions (SMSI) [77,104]. Examples of in situ TEM results acquired with gas cell TEM holders are shown in Fig.…”
Section: Gas Cells-on the Relevance Of In Situ Resultsmentioning
confidence: 99%
“…Other studies showed that the particle size distribution changes after thermal treatments, under different gas mixtures that induced either sintering or etching processes [109,110]. [104] and [77] Although it is claimed in these works that those evolutions result from catalytic reactions, they can only be attributed to thermal treatments in a controlled atmosphere in the absence of conversion measurements. Another study proposed to reverse the loss of activity caused by sintering at high temperature using nitrogen-doped carbon shells on Pd, Au and Pt NPs [111].…”
Section: Gas Cells-on the Relevance Of In Situ Resultsmentioning
confidence: 99%
“…The Ti 2 O 3 monolayers are the rst to be formed as pressure increases. At the typical conditions for SMSI experiment (10 5 Pa hydrogen pressure and 600 C), 17,38 for Pt, Pd, Ru, Os, Rh and Ir, all reduced monolayers exhibit negative formation energies, indicating that encapsulation of these metal nanoparticles by a monolayer is thermodynamically favourable. For Au, Ag and Cu, the Ti 2 O 3 monolayers has similar Gibbs free energies as the bulk TiO 2 , leading to the competition between an encapsulation state and a clean metal surface state.…”
Section: Phase Diagrams Of Monolayersmentioning
confidence: 99%
“…37 Our recent work showed that the migration of reduced titanium oxide onto a platinum particle surface and the formation of an Ti-Pt alloy are competing mechanisms during high-temperature reduction. 38 From the thermodynamic point of view, SMSI processes are driven by the minimization of the total free energy of the system. The inuence of the bulk, surface and interface energy should be taken into consideration for accurate thermodynamic calculations.…”
Section: Introductionmentioning
confidence: 99%
“…Tuning the strong metal‐support interactions (SMSIs) between the metal catalyst and oxide support is considered an effective strategy for enhancing catalytic selectivity and stability. [ 2–6 ] There are multiple categories of SMSIs, including metal‐support charge transfer, metal‐support interphase layer formation, and the encapsulation metal‐support interaction, among others. [ 7 ] In particular, the encapsulation interaction shows promise as a potential mechanism for immobilizing oxide‐supported nanoparticle catalysts and controlling their selectivity.…”
Section: Introductionmentioning
confidence: 99%