Platinum Group Metals: Green Recovery from Spent Auto-Catalysts and Reuse in New Catalysts—A Review

This manuscript reviews the current trends in recovery of Platinum Group Metals (PGMs) from end-of-life autocatalysts and aims recently funded Marie Sklodowska-Curie Project “Chemistry Metals-CHemPGM” towards greening PGMs processes reusing recovered for preparation new catalysts. Together with analysis state art spent through pyrometallurgical hydrometallurgical routes recent reducing their environmental impact, also emerging sustainable green technologies are analyzed. Particular focus is given on mechanochemical processing as a promising route not only pretreatment waste materials but direct leaching. The present review identifies catalysts carbon neutrality few efforts developing PGM-based starting directly liquor leach solutions envisaging therefore possible key to close loop more efficient way.