Method for producing aqueous preparations of complexes of platinum group metals

US10954261B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Eileen Woerner · Nidderau, DE
• Ralf Karch · Kleinostheim, DE
• Andreas Rivas-Nass · Schriesheim, DE
• Angelino Doppiu · Seligenstadt, DE

Key dates

• Filing date: Dec 29, 2017
• Grant date: Mar 23, 2021
• Expiry date: Oct 26, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F15/0093
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing aqueous preparations of complexes of platinum group metals (PGM) Pt, Pd, Rh and Ir having the general formula [MA/MB/MC(L)a (H2O)b (O2—)c(OH−)d] (OH—)e(H+)f, wherein MA=PtII or PdII, MB=PtIV, MC=Rh or Ir, L is a neutral monodentate or bidentate donor ligand, and a is an integer between 1 and 4 (or 2) and/or between 1 and 6 (or 3), b is an integer between 0 and 3 (or 5), c is an integer between 0 and 3 (or 4), d is an integer between 0 and 3 (or 5), e is an integer between 0 and 2 (or 3 or 4) and f is an integer between 0 and 4 (or 5). In the method according to the invention, the hydroxo complexes H2Pd(OH)4 (in the case of MA=PdII), H2Pt(OH)6 (in the case of MA=PtII and MB=PtIV) or H3MC(OH)6 (for MC=RhIII IrIII) are converted in the presence of the donor ligands, wherein at least one hydroxo group of the hydro complex is exchanged. Preferably, the reaction occurs at temperatures in the range of 40 to 110° C. with a reaction time of between 2 and 24 hours, wherein, where MA=PtII, the conversion additionally occurs in the presence of a reduction agent. The method optionally further comprises an exchange of OH anions bound outside of the…