| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Garbacz, Halina
Warsaw University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2024A novel approach to enhance mechanical properties of Ti substrates for biomedical applicationscitations
- 2024Albumin suppresses oxidation of Ti-Nb alloy in the simulated inflammatory environment
- 2023The influence of microstructure and texture on the hardening by annealing effect in cold-rolled titaniumcitations
- 2022Surface Properties and Mechanical Performance of Ti-Based Dental Materials: Comparative Effect of Valve Alloying Elements and Structural Defectscitations
- 2020High-strength ultrafine-grained titanium 99.99 manufactured by large strain plastic workingcitations
- 2020Biological properties of a novel β-Ti alloy with a low young’s modulus subjected to cold rollingcitations
- 2020Effect of laser functionalization of titanium on bioactivity and biological responsecitations
- 2016Investigation of the degradation mechanism of catalytic wires during oxidation of ammonia processcitations
- 2014Anodic polarization of nanocrystalline titaniumcitations
- 2014Chemical modification of nanocrystalline titanium surface for biological applications
- 2013Investigation of degradation mechanism of palladium-nickel wires during oxidation of ammoniacitations
- 2013Analysis of two catalytic systems PtRhPd-PdAu and PtRh-PdAu after long-term exploitation
- 2012High cycle fatigue strength of hydrostatically extruded nanocrystalline CP titanium
- 2011Microstructure and mechanical properties of a Pt–Rh alloy produced by powder metallurgy and subjected to plastic workingcitations
- 2011Effect of laser treatment on the surface of copper alloyscitations
- 2010Fatigue properties of nanocrystalline titanium
- 2009Modifying the properties of the Inconel 625 nickel alloy by glow discharge assisted nitridingcitations
- 2007Ti - Al intermetallic layers produced on titanium alloy by duplex method
- 2006Effect of the Al<inf>2</inf>O<inf>3</inf> + Ni-Al multilayer on the mechanical properties of Inconel 600 alloycitations
- 2006Effect of surface treatment on the microstructure of TA6V
- 2006The influence of hydrostatic extrusion on the microstructure of 6082 aluminium alloy
- 2006Structure and properties of nanomaterials produced by severe plastic deformation
- 2006Influence of severe plastic deformation on the PLC effect and mechanical properties in Al 5XXX alloy
- 2005Structure and properties of Ti-Al intel-metallic layers produced on titanium alloys by a duplex treatment
- 2005Microstructure and mechanical properties of nanocrystalline titanium and Ti-Ta-Nb alloy manufactured using various deformation methodscitations
- 2005Grain refinement in aluminium and the aluminium Al-Cu-Mg-Mn alloy by hydrostatic extrusion
- 2005Microstructure and mechanical properties of nickel deformed by hydrostatic extrusion
- 2005Hydrostatic extrusion and nanostructure formation in an aluminium alloycitations
- 2003Microstructural changes during oxidation of titanium alloyscitations
Places of action
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article
Investigation of the degradation mechanism of catalytic wires during oxidation of ammonia process
Abstract
The most common catalysts for the ammonia oxidation process are 80 μm diameter platinum-rhodium wires knitted or woven into the form of a gauze. In an aggressive environment and under extreme conditions (temperature 800–900 °C, intensive gas flow, high pressure) precious elements are drained from the surface of the wires. Part of this separated material quickly decomposes on the surface in the form of characteristic “cauliflower-shape protrusions”. The rest of the platinum is captured by palladium-nickel catalytic-capture gauzes located beneath. In our investigation we focused on the effects of the degradation of gauzes from one industrial catalytic system. The aim of the study was to compare the degree and the mechanism of degradation of gauzes from a different part of the reactor. The study covered PtRh7 catalytic and PdNi5 catalytic-capture gauzes. X-ray computer microtomography investigation revealed that despite strong differences in morphology, each Pt-Rh wire has a similar specific surface area. This indicates that the oxidation process and morphological changes of the wires occur in a self-regulating balance, resulting in the value of the specific surface area of the catalyst. Microtomography analysis of Pd-Ni wires revealed strong redevelopment of the wires’ surface, which is related to the platinum capture phenomenon. Scanning electron microscope observations also revealed the nanostructure in the cauliflower-shape protrusions and large grains in the wires’ preserved cores. The high temperature in the reactor and the long-term nature of the process do not favor the occurrence of the nanostructure in this type of material. Further and detailed analysis of this phenomena will provide a better understanding of the precious metals etching and deposition processes during oxidation.