The Surface Chemistry of Catalytic Reactions: Progress and Challenges

Zaera, Francisco

doi:10.1021/acs.jpclett.5b02053

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…76-0704), which suggests that the product comprises ZnO nanocrystals with the wurtzite structure. 28 The absence of any other dominant peak indicates that the particles are merely naked and emphasizes the aptability of the particles for catalytic applications. 4 shows the FTIR spectrum of the as-prepared ZnO assemblies formed at the interface of emulsion droplets.…”

Section: Resultsmentioning

confidence: 99%

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

et al. 2015

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o-Xylene-in-water emulsion droplets have been exploited as soft templates for the synthesis of submicrometer-sized raspberry-like ZnO morphologies. The optical properties, structure and morphology of the microstructures have been characterised by absorption and fluorescence spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and selected area electron diffraction analysis. It has been found that the microstructures could act as an environmentally benign and cost-effective alternative to conventional Lewis acid catalysts for the illustrious Fries rearrangement of o-methylphenyl acetate to 3-methyl-4-hydroxyacetophenone, employed as the model reaction and which has been probed by NMR spectroscopic studies.

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Section: Resultsmentioning

confidence: 99%

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

et al. 2015

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“…Through a sequence of various configurational changes that the reactant molecules undergo, the catalysts can direct the reaction path in a more selective route toward the desired product, which also reduces the amount of required chemical work . This resulted in increasing effort in studying surface phenomena and characteristics associated with catalytic performance, − particularly with surface energy as a key feature for understanding the activity of inorganic catalysts. − Here, we propose the use of friction force microscopy (FFM) to estimate surface corrugation energy as a useful characterization technique mainly since it is associated with adhesion energy, which was shown to be related to catalytic performance. , …”

Section: Introductionmentioning

confidence: 99%

Application of Static Disorder Approach to Friction Force Microscopy of Catalyst Nanoparticles to Estimate Corrugation Energy Amplitudes

et al. 2019

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Friction force microscopy (FFM) of materials with well-defined crystalline surfaces is interpreted within the framework of the Prandtl–Tomlinson (PT) model. This model portrays the interaction with a surface through a deterministic periodic potential. While considering materials with polycrystalline or amorphous surfaces, the interpretation becomes more complex, since such surfaces may lack distinct lattice constant and/or corrugation energy amplitude. Here, we utilize an approach to describe the nanofriction measured on a catalyst with an irregular surface by describing the slip forces in terms of static disorder (SD) in the corrugation potential. We performed FFM measurements of the Fe–Al–O spinel catalyst powder, which is involved in reverse water–gas-shift reaction. The FFM measurements resulted in intermittent stick–slip pattern with large variance in the slip forces and their spatial distribution. We compare our results with a mean version of the PT model. The two models showed close proximity of the surface energy values and their trend with the applied normal load, where the SD model estimations were less scattered. The approach presented in this work may provide a useful tool to interpret the FFM measurements of materials with irregular surfaces.

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“…Solar energy conversion with photoelectrochemical cells has attracted a significant amount of research and development. − One of the most studied materials in the past couple of decades is iron(III) oxide (Fe 2 O 3 ). − The many advantages of Fe 2 O 3 include having proper band-edge positions and band gap for catalysis and solar energy absorption, respectively. The outstanding advantage that makes Fe 2 O 3 superior to other suggested materials is long-lasting stability, yet a major limitation is low mobility and high electron–hole recombination rate. − This limitation can be avoided by nanostructuring. − …”

Section: Introductionmentioning

confidence: 99%

Water Oxidation Catalysis with Fe₂O₃ Constrained at the Nanoscale

Dahan

Toroker

2017

J. Phys. Chem. C

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Photoelectrochemical cells containing iron(III) oxide (Fe2O3) have attracted extensive investigations due to their ability to convert solar energy into chemical energy by water splitting. Recently, fabrication of nanoscaled Fe2O3 has been adopted for photoelectrochemical cells to increase solar energy absorption and reduce slow diffusion length of charge carriers. To understand how nanoscaled confinement influences catalytic efficiency, we perform density functional theory + U calculations of water oxidation on a thin slab of Fe2O3(0001). We consider possible hydrogen vacancies that may appear at high pH and voltage and find that promoting hydrogen vacancy formation improves catalytic efficiency. We also analyze the effect of geometrical strain on the slab that may result from deposition on a substrate. We conclude that nano-Fe2O3 should be grown on a substrate with a similar lattice constant to reduce strain and improve catalytic efficiency.

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The Surface Chemistry of Catalytic Reactions: Progress and Challenges

Cited by 4 publications

References 13 publications

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

Application of Static Disorder Approach to Friction Force Microscopy of Catalyst Nanoparticles to Estimate Corrugation Energy Amplitudes

Water Oxidation Catalysis with Fe₂O₃ Constrained at the Nanoscale

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The Surface Chemistry of Catalytic Reactions: Progress and Challenges

Cited by 4 publications

References 13 publications

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

Submicron ZnO raspberries as effective catalysts for Fries rearrangement

Application of Static Disorder Approach to Friction Force Microscopy of Catalyst Nanoparticles to Estimate Corrugation Energy Amplitudes

Water Oxidation Catalysis with Fe2O3 Constrained at the Nanoscale

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Product

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Water Oxidation Catalysis with Fe₂O₃ Constrained at the Nanoscale