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- Title
The use of a rotating cylinder electrode to selective recover palladium from acid solutions used to manufacture automotive catalytic converters.
- Authors
Terrazas-Rodríguez, J. E.; Gutiérrez-Granados, S.; Alatorre-Ordaz, M. A.; Ponce de León, C.; Walsh, F. C.
- Abstract
The reduction of palladium, rhodium and neodymium ions at concentrations of 0.94, 0.97 and 0.69 mol dm, respectively was studied in 1 mol dm HNO or 1 mol dm HCl, at a stainless steel and a vitreous carbon electrode, at 25 °C. At a vitreous carbon electrode in a solution containing rhodium and palladium ions in 1 mol dm HCl electrolyte, the reduction of metal ions occurred at a similar potential to the formation of hydrogen gas, which impeded the selective separation of the two metals. At a stainless steel cathode in 1 mol dm HNO, palladium deposition occurred at a potential ≈0.35 V less negative than that of rhodium allowing the selective recovery of palladium. Neodymium ions were not electroactive in acidic chloride or nitrate media at pH 0. Using a solution obtained from a catalytic converter manufacturer containing palladium, rhodium and neodymium ions in 1 mol dm HNO, palladium ions were preferentially removed at 0.15 V versus SHE at an average cumulative current efficiency of 57%.
- Subjects
AUTOMOBILE catalytic converter manufacturing; METALS; METAL ions; SOLVENT extraction; PRECIPITATION (Chemistry); CHEMICAL reduction; SUPERCRITICAL fluids
- Publication
Journal of Applied Electrochemistry, 2011, Vol 41, Issue 1, p89
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-010-0212-9