Heterogeneous Surfaces as Structure and Particle Size Libraries of Model Catalysts

Suchorski, Yuri; Rupprechter, Günther

doi:10.1007/s10562-018-2506-1

Cited by 22 publications

(32 citation statements)

References 63 publications

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“…As already mentioned, polycrystalline metal foils which consist of many μm-sized, crystallographically differently oriented ( hkl )-domains separated by grain boundaries, provide a possibility for surface-structure libraries. 17 Applying the local kinetics by imaging approach with PEEM as imaging tool, the details of the reaction process on individual μm-sized domains can be studied. 40,41…”

Section: Methodsmentioning

confidence: 99%

Surface-Structure Libraries: Multifrequential Oscillations in Catalytic Hydrogen Oxidation on Rhodium

et al. 2019

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Multifrequential oscillating spatiotemporal patterns in the catalytic hydrogen oxidation on rhodium have been observed in situ in the 10–6 mbar pressure range using photoemission electron microscopy. The effect is manifested by periodic chemical waves, which travel over the polycrystalline Rh surface and change their oscillation frequency while crossing boundaries between different Rh(hkl) domains. Each crystallographically specific μm-sized Rh(hkl) domain exhibits an individual wave pattern and oscillation frequency, despite the global diffusional coupling of the surface reaction, altogether creating a structure library. This unique reaction behavior is attributed to the ability of stepped surfaces of high-Miller-index domains to facilitate the formation of subsurface oxygen, serving as a feedback mechanism of kinetic oscillations. Formation of a network of subsurface oxygen as a result of colliding reaction fronts was observed in situ. Microkinetic model analysis was used to rationalize the observed effects and to reveal the relation between the barriers for surface oxidation and oscillation frequency. Structural limits of the oscillations, the existence range of oscillations, as well as the effect of varying hydrogen pressure are demonstrated.

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Section: Methodsmentioning

confidence: 99%

Surface-Structure Libraries: Multifrequential Oscillations in Catalytic Hydrogen Oxidation on Rhodium

et al. 2019

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“…Furthermore, it is well-recognized that the reactivity and selectivity of monodisperse metal NPs can be improved by changes in their size and shape. 36 Yuji and co-workers successfully xed a Cu-pyridine derivative complex on silica. It was subjected to a reversible redox cycle between copper(II) and copper(I), and applied successfully as a catalyst for the oxidative coupling reaction of methylacetylene.…”

Section: Introductionmentioning

confidence: 99%

“…Copper(II) complexes of the 12-membered macrocyclic ligands bearing three different donating atoms (N 2 S 2 (35), N 2 O 2 (36) and N 4 (37)) in the macrocyclic ring were encapsulated into the nanocavity of zeolite-Y via the exible ligand method (Scheme 37). 84 It is noteworthy that the copper(II) complexes having macrocyclic ligands were entrapped in the nanocavity of zeolite-Y.…”

Section: Introductionmentioning

confidence: 99%

Applications of Cu(0) encapsulated nanocatalysts as superior catalytic systems in Cu-catalyzed organic transformations

et al. 2020

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“…In the present contribution, as an alternative approach we apply a surface structure library [9,20], i.e. a sample containing adjacent regions with different, but crystallographically well-defined orientations.…”

Section: Introductionmentioning

confidence: 99%

“…proper candidates. By determination of crystallographic orientation of the individual domains using electron backscatter diffraction (EBSD) such foils turn into real well-defined surface structure libraries [8,9,20,21]. Since the crystalline grains are in the 10-300 µm range, hundreds of individual domains with dozens of different orientations can be found on a 1 × 1 cm 2 foil.…”

Section: Introductionmentioning

confidence: 99%

CO Oxidation on Stepped Rh Surfaces: μm-Scale Versus Nanoscale

et al. 2019

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The catalytic CO oxidation reaction on stepped Rh surfaces in the 10 −6 mbar pressure range was studied in situ on individual μm-sized high-Miller-index domains of a polycrystalline Rh foil and on nm-sized facets of a Rh tip, employing photoemission electron microscopy (PEEM) and field-ion/field-emission microscopy (FIM/FEM), respectively. Such approach permits a direct comparison of the reaction kinetics for crystallographically different regions under identical reaction conditions. The catalytic activity of the different Rh surfaces, particularly their tolerance towards poisoning by CO, was found to be strongly dependent on the density of steps and defects, as well as on the size (µm vs. nm) of the respective catalytically active surface. Graphic AbstractKeywords Surface reaction kinetics · PEEM · FEM/FIM · CO oxidation · Rhodium

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Heterogeneous Surfaces as Structure and Particle Size Libraries of Model Catalysts

Abstract: Graphical Abstract

Cited by 22 publications

References 63 publications

Surface-Structure Libraries: Multifrequential Oscillations in Catalytic Hydrogen Oxidation on Rhodium

Surface-Structure Libraries: Multifrequential Oscillations in Catalytic Hydrogen Oxidation on Rhodium

Applications of Cu(0) encapsulated nanocatalysts as superior catalytic systems in Cu-catalyzed organic transformations

CO Oxidation on Stepped Rh Surfaces: μm-Scale Versus Nanoscale

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