Microstructure and Catalytic Activity of Al13Fe4 and Al13Co4 Melt-Spun Alloys

Zięba, Amelia; Stan-Głowińska, Katarzyna; Czaja, Paweł; Rogal, Łukasz; Przewoźnik, J.; Duraczyńska, Dorota; Serwicka, Ewa M.; Lityńska‐Dobrzyńska, Lidia

doi:10.1017/s1431927621012320

Cited by 7 publications

(1 citation statement)

References 32 publications

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“…Hence, a viable alternative to wet chemical synthesis represented by melt spinning technique has been recently proposed for production of catalytically active intermetallics. 5,6) Melt spinning is easily scalable and it furthermore yields brittle, easily pulverisable ribbon flakes with dimensions of 27 mm in length and 2060 µm in thickness. Given the ease and fast production rate as well as composition controllability, melt spinning as such can be easily applied for catalyst screening.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties and Microstructure of Catalytically Active Ni70Ga30, Ni70Sn30 and Ni70In30 Melt Spun Intermetallics Subjected to Oxidation-Reduction Heat Treatment

et al. 2022

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Melt spun Ni 70 Ga 30 , Ni 70 Sn 30 and Ni 70 In 30 show different oxidation behaviour following heat treatment at 900°C in air. The Ni 70 Ga 30 ribbon develops a continuous layer of Ga 2 O 3 oxide, which passivates the surface and prevents further oxidation of the Ni 3 Ga bulk phase. On the contrary, the Ni 70 Sn 30 and Ni 70 In 30 ribbons undergo considerable segregation and decomposition and aside from the Ni and NiO and the primary Ni 3 Sn and Ni 3 In also comprise SnO 2 and In 2 O 3 phases. Results are conformed from XRD, TEM and XPS analysis. The oxidation behaviour especially in the case of the Ni 70 Sn 30 ribbon is promising with view for development of fine Ni particles on the Ni 3 Sn support.

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Section: Introductionmentioning

confidence: 99%

Surface Properties and Microstructure of Catalytically Active Ni70Ga30, Ni70Sn30 and Ni70In30 Melt Spun Intermetallics Subjected to Oxidation-Reduction Heat Treatment

et al. 2022

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Microstructural characterization of rapidly solidified Al-13.5 at.% Cr and Al-13.5 at.% V alloys for catalytic applications

Zięba,

Stan-Głowińska,

Rogal

et al. 2023

J Mater Sci

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Intermetallic compounds, due to their well-defined stoichiometry, arrangement of atoms and controlled crystal structure, are a promising alternative to expensive noble metal catalysts. In this paper, the catalytic properties of Al-13.5 at.% Cr and Al-13.5 at.% V alloys, corresponding to the quasicrystalline approximants Al45Cr7 and Al45V7, were investigated for the first time.The alloys in the form of fragmented brittle ribbons were produced by the melt-spinning. The microstructure of the ribbons, both in the as-spun state and after heat treatment (100 h at 600 °C), was characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. In the as-spun state, the ribbons showed a multiphase microstructure. In addition to the Al45Cr7 phase in the Al-Cr alloy and the Al3V phase in the Al-V alloy, they also contained α(Al) solid solution and icosahedral quasicrystalline phases. After heat treatment, the alloys became almost single phase, consisting mainly of stable monoclinic phases: Al45Cr7 or Al45V7. The catalytic performance of the phenylacetylene hydrogenation reaction was tested on as-spun and heat-treated alloys that had previously been pulverized and sieved to select a powder fraction of less than 32 µm. All the tested materials show high substrate conversion, above 80% after 1 h reaction, along with high activity rate. The homogenized powders demonstrated a slightly better properties in relation to as-spun materials. These results confirm the potential of intermetallic catalysts, including the tested alloys, in hydrogenation reactions and verify the possibility of using the metallurgical method to obtain catalytically active materials. Graphical abstract

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Rapidly solidified Al-Cu-Co quasicrystalline alloy: microstructure and catalytic properties

Zięba,

Stan-Głowińska,

Duraczyńska

et al. 2024

Archiv.Civ.Mech.Eng

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This study presents the characterisation and evaluation of the catalytic potential of an alloy with a composition referring to the quasicrystal from the Al-Cu-Co system. The material was synthesised through a melt-spinning process, providing rapid solidification conditions and a favourable material form of thin ribbons. Microstructural and chemical analyses were performed using scanning electron microscopy, X-ray diffraction and transmission electron microscopy methods. The obtained results confirmed the presence of a major phase which was a decagonal quasicrystal in the form of globular grains and additional crystalline phases occurring along the grain boundaries. The catalytic potential of the materials was explored using phenylacetylene hydrogenation. The catalyst, obtained by pulverising the ribbons, demonstrated catalytic activity with over 40% phenylacetylene conversion and selectivity exceeding 60% for styrene production under mild reaction conditions. The recovered catalyst displayed a stable phase composition, as confirmed by X-ray diffraction, and unchanged morphology, indicating the possibility of catalyst reuse for subsequent reaction cycles. The presented results provide insight into the experimental verification of the catalytic properties of the developed environmentally friendly catalysts.

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Microstructure and Catalytic Activity of Al₁₃Fe₄ and Al₁₃Co₄ Melt-Spun Alloys

Abstract: Abstract

Cited by 7 publications

References 32 publications

Surface Properties and Microstructure of Catalytically Active Ni<sub>70</sub>Ga<sub>30</sub>, Ni<sub>70</sub>Sn<sub>30</sub> and Ni<sub>70</sub>In<sub>30</sub> Melt Spun Intermetallics Subjected to Oxidation-Reduction Heat Treatment

Surface Properties and Microstructure of Catalytically Active Ni<sub>70</sub>Ga<sub>30</sub>, Ni<sub>70</sub>Sn<sub>30</sub> and Ni<sub>70</sub>In<sub>30</sub> Melt Spun Intermetallics Subjected to Oxidation-Reduction Heat Treatment

Microstructural characterization of rapidly solidified Al-13.5 at.% Cr and Al-13.5 at.% V alloys for catalytic applications

Rapidly solidified Al-Cu-Co quasicrystalline alloy: microstructure and catalytic properties

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