3D atom probe study of gaseous adsorption on alloy catalyst surfaces III: Ternary alloys – NO on Pt–Rh–Ru and Pt–Rh–Ir

Bagot, P.A.J.; Cerezo, A.; Smith, George Davey

doi:10.1016/j.susc.2008.01.041

Cited by 31 publications

(14 citation statements)

References 45 publications

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“…Analysis of Pt-10.1 at.% Ir [86] using a reaction cell leads to Ir enrichment upon oxidation, as well as competitive Ir and Rh surface segregation in the Pt-17.3 at.% Rh-14.0 at.% Ir alloy, consistent with previous experiments focusing on {111} and {001} facets only [90].…”

Section: Appl Sci 2019 9 X For Peer Review 10 Of 35supporting

confidence: 87%

“…Different systems have been studied with these cells: NO and CO/Pt, NO, CO, O 2 , N 2 O, NO + CO and NO + O 2 /Pt-Rh [85,88,89], NO/Pt-Rh-Ir, NO/Pt-Rh-Ru [90], NO/Au-Pd [52,91] and O 2 , N 2 O and H 2 /Au-Ag [92] for the 3DAP version of the cell; and O 2 /Al, O 2 /Pt-Ir, O 2 /Pt-Rh-Ir [86]; D 2 /Pd, O 2 and H 2 O/Mg [87] for the most recent cells.…”

Section: Latest Developments: Environmental Cells For Aptmentioning

confidence: 99%

“…The results obtained on Pt-17.4 at.% Rh were compared to experiments on Pt-23.9 at.% Rh-9.6 at.% Ru and Pt-17.3 at.% Rh-14.0 at.% Ir specimens [90], also produced with the same electropolishing methodology. Adding a third element to Pt-Rh catalysts improves the activity towards specific reactions, increases the resistance to poisoning or decreases the light-off temperature.…”

Section: Pt-based Alloysmentioning

confidence: 99%

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Atom Probe Tomography for Catalysis Applications: A Review

2019

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Atom probe tomography is a well-established analytical instrument for imaging the 3D structure and composition of materials with high mass resolution, sub-nanometer spatial resolution and ppm elemental sensitivity. Thanks to recent hardware developments in Atom Probe Tomography (APT), combined with progress on site-specific focused ion beam (FIB)-based sample preparation methods and improved data treatment software, complex materials can now be routinely investigated. From model samples to complex, usable porous structures, there is currently a growing interest in the analysis of catalytic materials. APT is able to probe the end state of atomic-scale processes, providing information needed to improve the synthesis of catalysts and to unravel structure/composition/reactivity relationships. This review focuses on the study of catalytic materials with increasing complexity (tip-sample, unsupported and supported nanoparticles, powders, self-supported catalysts and zeolites), as well as sample preparation methods developed to obtain suitable specimens for APT experiments.

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Section: Appl Sci 2019 9 X For Peer Review 10 Of 35supporting

confidence: 87%

Section: Latest Developments: Environmental Cells For Aptmentioning

confidence: 99%

Section: Pt-based Alloysmentioning

confidence: 99%

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Atom Probe Tomography for Catalysis Applications: A Review

2019

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“…Preliminary APT investigations using nitric oxide/oxygen exposures to Pt−Rh−Ir and Pt−Rh−Ru alloys have already demonstrated distinct differences in surface segregation and microstructure compared with the parent binary alloys. 17,18 In the current work, our goal is to investigate the early stages of oxidation in a ternary Pt−Pd−Rh alloy gauze by a multitechnique approach. Such gauze catalysts are of great industrial importance because of their role in the ammonia oxidation reaction, a key stage in the production of nitric acid for fertilizers and plastics.…”

Section: Introductionmentioning

confidence: 99%

Oxidation and Surface Segregation Behavior of a Pt–Pd–Rh Alloy Catalyst

et al. 2014

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Platinum gauze catalysts are used extensively in the production of nitric acid from ammonia, where they are subject to harsh operating conditions combining elevated temperatures and oxidizing environments. These cause significant loss of metal species as volatile oxides. How different metallic species behave in these environments at a fundamental, atomic-scale level is not well understood. In this work, we study the early stages of oxidation of a Pt−Rh−Pd gauze at temperatures of 873−1273 K. Using a combination of advanced experimental methods, we explore how the oxidation behavior can strongly influence the surface and near-surface gauze microstructure. We show that Rh and Pd can segregate on different areas of the same surface and discuss how such atomic migration can be linked to mechanisms of metal loss from such alloys.

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“…The CAP better approximated real-world exposures of heterogeneous catalytic materials by allowing exposure to gaseous atmospheres at greater pressures (≤1 bar) and at higher temperatures (≤873 K). The CAP enabled a number of studies on surface segregation trends in binary [ 68 ] and ternary [ 69 ] Pt-group alloys, as well as Au and Ag alloys [ 70 , 71 ]. Through studying the Pt-group alloys by using the CAP, it was determined that the influence of Ru or Ir additions on the surface behavior was dependent on which crystal faces were exposed to the NO gas.…”

Section: Technology Developmentmentioning

confidence: 99%

New frontiers in atom probe tomography: a review of research enabled by cryo and/or vacuum transfer systems

McCarroll

Bagot

Devaraj

et al. 2020

Materials Today Advances

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There has been a recent surge in the use of cryo and/or vacuum specimen preparation and transfer systems to broaden the scope of research enabled by the microscopy technique of atom probe tomography. This is driven by the fact that, as for many microscopes, the application of atom probes to air- and temperature-sensitive materials or wet biological specimens has previously been limited by transfer through air at room temperature. Here we provide an overview of areas of research that benefit from these new transfer and analysis protocols, as well as a review of current advances in transfer devices, environmental cells, and glove boxes for controlled specimen manipulation. This includes the study of catalysis and corrosion, biological samples, liquid-solid interfaces, natural aging, and the distribution of hydrogen in materials.

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3D atom probe study of gaseous adsorption on alloy catalyst surfaces III: Ternary alloys – NO on Pt–Rh–Ru and Pt–Rh–Ir

Cited by 31 publications

References 45 publications

Atom Probe Tomography for Catalysis Applications: A Review

Atom Probe Tomography for Catalysis Applications: A Review

Oxidation and Surface Segregation Behavior of a Pt–Pd–Rh Alloy Catalyst

New frontiers in atom probe tomography: a review of research enabled by cryo and/or vacuum transfer systems

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