A Comparative Evaluation of Leaching Reagents of Platinum Group Metals from Spent Catalytic Converters Using Microwave Heating.

ABSTRACT: Platinum group metals (PGMs) are increasingly recycled from spent automotive catalysts due to their scarcity in nature. Many studies were developed using different leaching reagents to achieve greener benefits and reduce environmental pollution. This article reports for the first time a direct comparison of leaching reagents on the efficiency of PGMs using microwave (MW) assisted heating. The leaching system employed HCl with/without the addition of complexing (citric acid) or oxidizing agents (HNO₃, H₂O₂, NaClO, NaClO₃). It was shown that the 11.65 M HCl could leach all elements (94 % Pt, 82 % Pd and 74 % Rh) at 210 °C. The addition of oxidant(s) decreased the PGMs leaching efficiencies due to the formation of a protective oxide layer through su

SUBMITTER: Ni H'ng Y 

PROVIDER: S-EPMC11873761 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature