Electro‐kinetic Separation of Rare Earth Elements Using a Redox‐Active Ligand

We demonstrate a new approach for rare earth element separations by exploiting differences in the oxidation rates within a series of rare earth compounds containing the redox-active ligand: 3-

Huayi Fang; Bren E. Cole; Yusen Qiao; Justin A. Bogart; Thibault Cheisson; Brian C. Manor; Patrick J. Carroll; Eric J. Schelter

2017

Scholarcy highlights

  • Purification of rare earth elements is challenging due to their chemical similarities
  • Rare earth elements, including the lanthanides, yttrium and scandium, are crucial components in many materials, such as permanent magnets, batteries, hydrogen storage materials, phosphors and catalysts, that are widely used in industries ranging from renewable energy to electric vehicles and advanced electronic devices
  • Because of the growing global Rare earth elements demand, which is projected at an annual growth rate of 5% through 2020, and their indispensable roles in diverse applications, REs are categorized as critical raw materials by the U.S Department of Energy and the European Commission.
  • Based on the results obtained from the chemical oxidations of and, the oxidation waves observed for and in Figure 1 could be assigned to the oxidation of the neutral compounds, which led to the formation of the dimeric cations through the postulated EC mechanism
  • To test the feasibility of the kinetic separation method and the established model based on the oxidation rate differences for
  • We demonstrated an electro-kinetic separation method for REs based on a series of 50:50 molar ratio binary mixtures, including Eu/Y, Y/Yb, Y/Lu, by exploiting the kinetic difference for the oxidation reactions of different RE-TriNOx compounds whose performance were consistent with predictions from the kinetic model
  • Redox-active ligand the kinetic separation of a 50:50 molar ratio binary RE1/RE2 mixture at 298 K

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