Journal
GREEN CHEMISTRY LETTERS AND REVIEWS
Volume 15, Issue 2, Pages 404-414Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17518253.2022.2068973
Keywords
Recycling; platinum group metals; deep eutectic solvents; circular economy; Critical Raw Material Recovery
Funding
- European Union [730224]
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The recovery of platinum group metals (PGMs) is of critical importance due to the depletion of natural resources and increasing demand. This study presents a process using benign deep eutectic solvents (DESs) for PGM extraction from spent car catalysts, demonstrating their effectiveness as leaching media.
The recovery of platinum group metals (PGMs) from secondary raw materials has become a topic of critical importance mainly due to the gradual depletion of their natural resources and their continuously increasing demand. However, the insufficient recovery of PGMs coupled with the negative environmental impact of the state-of-the-art recycling procedures mandate the investigation and development of alternative recovery processes that will assist in minimizing or even eliminating these drawbacks. Herein, we present a process for the extraction of platinum group metals from spent car catalysts relying on benign deep eutectic solvents (DESs). It is demonstrated that with addition of small amounts of an oxidizing agent, deep eutectic solvents can act as excellent leaching media for the quantitative extraction of platinum group metals. Despite its inertness towards acidic and oxidizing agents, Rh can be leached in a considerable amount which can be further increased by physical pre-treatment of the spent car catalyst material. [GRAPHICS]
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