Speaker
Description
Intermetallic compounds have been recently shown as active catalysts for a range of industrial reactions including methanol decomposition or selective hydrogenation of unsaturated hydrocarbons. Already at ambient temperature they can offer high selectivities at appreciable conversion rates. Such intermetallics can be produced either in a form of nanoparticles through various, complex wet chemical methods, or they can be synthesised more simply in bulk form as sheets, through metallurgical casting and cold-rolling or as ribbons through non-equilibrium melt spinning technique. The latter yields typically brittle, easily pulverisable ribbon flakes with thickness on the order of 20-60 µm and an average 1.4 µm in grain size. Since the resultant as melt spun ribbon flakes are brittle in nature they can be easily downsized by mechanical attrition to a nanometer particle size range in order to extend the active surface area. Even for a more enhanced performance pulverized ribbons can be then further subjected to preferential etching, dealloying or controlled surface oxidation/reduction pre-treatment allowing for conversion rate levels competitive to that attainable with more conventional noble metal catalysts. In this contribution we evaluate microstructure evolution and catalytic performance of as melt spun Ni-(Al, Ga, In, Sn) intermetallics following various modes of activation approach.
P. Czaja, J. Przewoźnik, R. Chulist, K. Stan-Głowińska, Ł. Rogal, A. Wójcik, A. Wierzbicka-Miernik D. Duraczyńśka, E.M. Serwicka, L.Lityńska-Dobrzyńska, Microstructure and catalytic activity for selecvtive hydrogenation of phenylacetylene of intermetallic Ni70Ga30, Ni70In30, Ni70Sn30 melt-spun alloys, Intermetallics 122 (2020) 106797.
Acknowledgements
This work was financially supported by the National Science Centre (NCN) Poland within the project No. 2017/25/B/ST8/02804.
| Speaker Country | Polska |
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