Investigation of degradation mechanism of palladium-nickel wires during oxidation of ammonia
PBN-AR
Instytucja
Wydział Inżynierii Materiałowej (Politechnika Warszawska)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Catalysis Today
ISSN
0920-5861
EISSN
Wydawca
DOI
URL
Rok publikacji
2014
Numer zeszytu
1
Strony od-do
48-55
Numer tomu
208
Identyfikator DOI
Liczba arkuszy
0.5
Słowa kluczowe
en
Precious metals; Catalysis; Pd–Ni; Gauze
Streszczenia
Język
en
Treść
The process of oxidation of ammonia proceeds in 800–900 °C with high reactivity hydrogen discharge. Extremely aggressive environment and temperature require using the most chemically resistant materials with catalysis properties. One of the main groups of those materials is palladium–nickel alloys. In our investigation we focused on analysis of PdNi5 degradation during catalysis process. The investigation was performed on 78 μm diameter wires after long exposition to chemically aggressive environment. The samples were prepared with focused ion beam (FIB) system. The observations of surface and wire cross sections were executed using a scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) device, which allowed defining chemical composition. The effect of a grain orientation on sensitivity to reaction with ammonia gas was tested by mapping with electron backscatter diffraction (EBSD) techniques. Significant change of wire cross section after long exposition was determined by 3D X-ray computer tomography (XCT). The obtained results can be basis of further investigation on improvement of strength of PdNi alloys in high temperature chemical application.
Inne
System-identifier
WUTde003fe6f29546359e86938cecc447f9
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