Microstructure and catalytic properties of rapidly solidified Al-28.5 at% Fe and Al-28.5 at% Co alloys applied for selective hydrogenation of phenylacetylene. (December 2022)

• Record Type: Journal Article
• Authors: Zięba, Amelia; Stan-Głowińska, Katarzyna; Rogal, Łukasz; Cios, Grzegorz; Czaja, Paweł; Przewoźnik, Janusz; Chulist, Robert; Duraczyńska, Dorota; Serwicka, Ewa M.; Lityńska-Dobrzyńska, Lidia
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Al5Fe2 -- Al5Co2 -- Intermetallic -- Quasicrystal -- Melt spinning -- Microstructure -- Catalysis; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104422
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: The Al71.5 Fe28.5 and Al71.5 Co28.5 (at%) melt-spun alloys were examined in terms of microstructure evolution and catalytic response in the semihydrogenation reaction of phenylacetylene to styrene. In the as-spun state ribbons showed a single-phase composition. The Al71.5 Co28.5 alloy contained columnar grains of a metastable decagonal quasicrystal, which transformed into hexagonal Al5 Co2 and monoclinic Al3 Co phases after heat treatment at 900 °C. The Al71.5 Fe28.5 ribbon had an ordered orthorhombic Al5 Fe2 phase structure in both the as-spun and annealed states. The pulverized ribbons revealed considerable catalytic activity for selective hydrogenation of phenylacetylene to styrene. The best results were achieved for the as-spun quasicrystalline Al71.5 Co28.5 alloy, showing a conversion rate of above 80% after 2 h reaction time. The selectivity to styrene was 60% for all catalysts. The tested powders retained their phase composition following liquid reaction therefore the proposed materials can be considered for catalytic use. Graphical Abstract: ga1 Highlights: The Al5Co2 and Al5Fe2 ribbons were prepare by melt spinning methods. Decagonal quasicrystal in the Al5Co2 transforms into Al5 Co2 and Al3 Co after annealing. Ordered orthorhombic Al5 Fe2 phase in both the as-spun and the annealed Al5Fe2 ribbons. Catalytic activity of the powdered ribbons in hydrogenation of phenylacetylene. The conversion rate exceeds 80% after 2 h reaction time for quasicrystalline Al5Co2.