Field desorption of a potassium-gold film on tungsten

Bernatskii, D. P.; Pavlov, V. G.

doi:10.1134/1.1788791

Cited by 2 publications

(2 citation statements)

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“…Finally, three more applications are relevant for catalysis studies: the interaction of cyclohexane on Au tips [237], which finds its interest in the abatement of Volatile Organic Compounds (VOC); the behaviour of potassium-gold films [227], which could be used to study the influence of promoter in a catalytic reaction; and eventually, the imaging of Au nanoparticles by FIM after deposition on a field emitter tip [238,239], opening a way to study the catalytic process on a single Au nanoparticle rather than on a tip-model.…”

Section: Perspectivesmentioning

confidence: 99%

“…In the past, Au-based systems were studied by FIM for various applications such as the study of long-range migration of self-interstitial atoms [224], phase transformation [225], precipitation in neutron-irradiated alloys [226], conductivity [227], or in the application of nano-tips to electron microscopy [228]. Even though these studies were not focused on catalysis, they proved the feasibility of imaging various Au-based alloys by FIM; alloys which are now used for catalysis applications: Au-Mo [228] for the reverse water-gas shift reaction [229,230] or as N 2 dissociation catalyst for the Haber-Bosch process [231], Au-Pt [224] for CO oxidation [49,232] and selective toluene oxidation [52], Au-Fe [226] for CO oxidation [233] and N 2 dissociation catalyst for the Haber-Bosch process [231], and Au-Cu [225,234] for the water gas-shift reaction [235,236] and CO oxidation [50].…”

Section: Perspectivesmentioning

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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