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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Ib

MM 17.13: Poster

Montag, 18. März 2024, 18:30–20:30, Poster F

Mechanochemical Pathway to Nickel — •Jikai Ye¹, Christian H. Liebscher², and Michael Felderhoff¹ — ¹Max-Planck-Institut für Kohlenforschung, Department of Heterogeneous Catalysis, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany — ²Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany

Metal oxide reduction is the key step to metal production in the process of both primary and secondary metal production. However, traditional methods usually correlate with high energy consumption from heating and CO₂ emission from carbonaceous reductants. Mechanochemistry describes certain reactions that can happen with the help of mechanical forces under much milder conditions, which could enable more sustainable pathways for metal productions. In this work, the possibility of reducing metal oxides at room temperature under hydrogen with ball-milling is confirmed, using NiO as an example. In a planetary ball-mill batch system under hydrogen pressure, NiO could be partially reduced, reaching an equilibrium state upon generation of water vapor. Further, with the help of a home-built gas-flow shaker-mill system, generated water from the reaction between NiO and hydrogen could be removed continuously. A much higher reduction degree could therefore be achieved. With mild heating (<100 ^∘C) during milling, reaction rate could be significantly increased benefiting from faster desorption of water. With this method, Ni nanoparticles were synthesized. Primitive tests also confirm that the as-synthesized Ni nanoparticles exhibit high catalytic activity over hydrogenation.

Keywords: mechanochemistry; nickel; metal oxide reduction; hydrogen; metallurgy