Hydrogenation of NO and NO<sub>2</sub>over palladium and platinum nanocrystallites: case studies using field emission techniques

Barroo, Cédric; Lambeets, Sten; Devred, François; Chau, T-D.; Kruse, Norbert; Decker, Yannick De; Bocarmé, Thierry Visart de

doi:10.1039/c3nj01505j

Cited by 24 publications

(19 citation statements)

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“…Heating a sample within the analysis chamber has also been extensively employed to study low pressure ( ∼ 10 -3 mbar or 100 Pa) surface restructuring reactions by a combination of fi eld ion microscopy and a 1D atom probe. 32 However, disrupting the analysis chamber vacuum for dedicated experiments is not desirable for APT.…”

Section: In Situ Reaction Cellsmentioning

confidence: 99%

Advances in atom probe tomography instrumentation: Implications for materials research

et al. 2016

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Section: In Situ Reaction Cellsmentioning

confidence: 99%

Advances in atom probe tomography instrumentation: Implications for materials research

et al. 2016

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“…The FIM images show an excellent agreement with a ball-model of a model hemisphere (Figure 4b). Morphological changes such as facetting or missing-row reconstructions can easily be imaged during their formation [98]. In FEM mode, a negative polarisation of the sample as compared to the screen-detector initiates the emission of surface electrons, as can be observed in Figure 4c,e.…”

Section: Field Emission Microscopy Fem/field Ion Microscopy Fimmentioning

confidence: 91%

Section: Field Emission Microscopy Fem/field Ion Microscopy Fimmentioning

confidence: 99%

“…The extremity of the tip-sample is a highly curved surface, which is a good model of a catalytic nanoparticle with a diameter of 20-100 nm. [98,129]. Pure gold samples are routinely prepared by electrochemical etching of a gold wire using KCN solutions, but also in CaCl2, NaCl, KCl, and H2SO4 + HNO3 solutions [130][131][132][133][134].…”

Section: Field Emission Microscopy Fem/field Ion Microscopy Fimmentioning

confidence: 99%

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Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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“…All these nonlinear behaviors are characterized by transitions from a state of low brightness to a state of high brightness, and vice versa. All the active facets ignite simultaneously within the time resolution of the recording device (40 ms) [21]. The degree of activity of the reaction can be probed on any of the {012} facets (see Fig.…”

Section: Oscillations During the No 2 + H 2 Reaction On Platinummentioning

confidence: 99%

Nonlinear Dynamics of Reactive Nanosystems: Theory and Experiments

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Barroo

et al. 2015

Bottom-Up Self-Organization in Supramolecular Soft Matter

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Reactive systems are known to give birth to complex spatiotemporal phenomena, when they are maintained far enough from their equilibrium state. There are literally hundreds of experimental evidences showing the emergence of such self-organized behaviors at the macroscopic scale. Examples include the appearance of regular oscillations of concentration in both space and time, the formation of stationary spatial organization of reactants and products, and the emergence of spatiotemporal chaos, to cite but a few examples.The theoretical understanding of these phenomena can be considered as being well established. Chemical reactions play a central role in the appearance of complex behaviors because they are nonlinear processes. Indeed, the rates of reactions are typically polynomials of the concentrations and moreover include constants that depend exponentially on the temperature. Because of this, the equations ruling the spatiotemporal development of chemical reactions, which often take the form of reaction-diffusion equations, admit complicated (and even sometimes multiple) solutions. The number and the type of solutions change abruptly for some precise combinations of the parameters of the system, which are known as bifurcation points. This feature explains why new dynamical behaviors are observed only whenever a

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Hydrogenation of NO and NO₂over palladium and platinum nanocrystallites: case studies using field emission techniques

Abstract: Hysteresis effects and kinetic instabilities have been characterised at the nanoscale for the hydrogenation of NOxspecies far from thermodynamic equilibrium.

Cited by 24 publications

References 36 publications

Advances in atom probe tomography instrumentation: Implications for materials research

Advances in atom probe tomography instrumentation: Implications for materials research

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Nonlinear Dynamics of Reactive Nanosystems: Theory and Experiments

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Hydrogenation of NO and NO2over palladium and platinum nanocrystallites: case studies using field emission techniques

Abstract: Hysteresis effects and kinetic instabilities have been characterised at the nanoscale for the hydrogenation of NOxspecies far from thermodynamic equilibrium.

Cited by 24 publications

References 36 publications

Advances in atom probe tomography instrumentation: Implications for materials research

Advances in atom probe tomography instrumentation: Implications for materials research

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Nonlinear Dynamics of Reactive Nanosystems: Theory and Experiments

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Hydrogenation of NO and NO₂over palladium and platinum nanocrystallites: case studies using field emission techniques