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Microstructural SEM/STEM Analysis of Ni70Ga30 and Ni70Sn30 Catalytically Active Intermetallic Ribbons after Prolonged Exposure to Elevated Process Temperature

Published online by Cambridge University Press:  30 July 2021

Paweł Czaja ,
Janusz Przewoźnik ,
Katarzyna Stan-Głowińska ,
Amelia Zięba Open the ORCID record for Amelia Zięba [Opens in a new window]  and
Lidia Lityńska-Dobrzyńska Open the ORCID record for Lidia Lityńska-Dobrzyńska [Opens in a new window]
Paweł Czaja*
Affiliation:
The Aleksander Krupkowski Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
Janusz Przewoźnik
Affiliation:
Faculty of Physics and Applied Computer Science, Department of Solid State Physics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
Katarzyna Stan-Głowińska
Affiliation:
The Aleksander Krupkowski Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
Amelia Zięba
Affiliation:
The Aleksander Krupkowski Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
Lidia Lityńska-Dobrzyńska
Affiliation:
The Aleksander Krupkowski Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
*
*Corresponding author: Paweł Czaja, E-mail: [email protected]
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Abstract

Melt-spun Ni70Ga30 and Ni70Sn30 monolithic catalysts, when subjected to prolonged oxidation in air at 770 K, undergo different microstructural changes. Whereas Ni70Ga30 is largely stable and composed of Ni3Ga phase, the Ni70Sn30 develops a two-layer microstructure on the exposed ribbon surface. The two-layer structure consists of a Ni-rich zone, which is founded on a SnO2 sublayer. In the bulk, the Ni70Sn30 ribbon is heterogeneous in phase composition and comprises of Ni3Sn and Ni3Sn2 phases. The development of Ni particulates on the outer ribbon surface, through simple oxidation heat treatment, may thus be a way for improving the catalytic performance of Ni70Sn30 ribbons, resembling that of Ni3Al ribbons spontaneously activated under reaction conditions.

Keywords

catalysiselectron microscopyintermetallicsmelt-spun ribbonsmicrostructure
Type
The XVIIth International Conference on Electron Microscopy (EM2020)
Information
Microscopy and Microanalysis , Volume 28 , Issue 3 , June 2022 , pp. 968 - 974
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America

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