Recovery of platinum group metals from a spent automotive catalyst using polymer inclusion membranes containing an ionic liquid carrier

Spent automotive catalysts (SACs) are the most abundant secondary source of platinum group metals (PGMs), but recycling these materials is quite challenging. In present study, we assessed recovery Pt, Pd, and Rh from a SAC leachate solution using polymer inclusion membranes (PIMs) containing ionic liquid trioctyl(dodecyl) phosphonium chloride (P 88812 Cl). After pretreatment reducing agent, could be extracted relatively dilute acid solutions. The selective transport PGMs such solutions was demonstrated with two types having same chemical composition: an isotropic dense membrane (ID-PIM) anisotropic porous (AP-PIM). Using ID-PIM, more than 90% Pt Pd in extraction recovered remarkably high purity. contrast, AP-PIM recover reasonable yields purities dramatically faster kinetics. Both excellent durability no loss carrier molecules over 10-day exposure to various harsh chemicals. • Recovery spent catalyst demonstrated. Polymer were employed. Two PIM prepared: membranes. Metal behaviors affected by morphologies. showed against