Recovery of platinum, tin and indium from spent catalysts in chloride medium using strong basic anion exchange resins |
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| Authors: | Marinho Roberta Santos da Silva Cristiano Nunes Afonso Julio Carlos da Cunha José Waldemar Silva Dias |
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| Affiliation: | a Analytical Chemistry Department, Institute of Chemistry, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, 149, room A509, 21941-909, Ilha do Fundão, Rio de Janeiro, Brazil
b Department of Chemistry and Nuclear Materials, Institute of Nuclear Engineering, Rua Hélio de Almeida, 75, 21941-906, Ilha do Fundão, Rio de Janeiro, Ramos Brazil |
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| Abstract: | This work describes a route for platinum recovery from spent commercial Pt and PtSnIn/Al2O3 catalysts using strong basic mesoporous and macroporous anion exchange resins (Cl− form). The catalysts were leached with aqua regia (75 °C, 20-25 min). Platinum adsorption was influenced by the presence of other metals which form chlorocomplexes (tin, indium) and also base metals (aluminum). However, it was possible to overcome this fact by a sequential desorption procedure. Aluminum was selectively removed from the resins by elution with 3 mol L−1 HCl. Platinum was desorbed passing 1 mol L−1 Na2S2O3 (pH 9). Tin was removed by elution with 0.1 mol L−1 ascorbic acid. Indium was removed using 0.1 mol L−1 EDTA as eluent. Desorption efficiency exceeded 99% for all metals. Metals were recovered in high yields (>98 wt%). |
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| Keywords: | Platinum Tin Indium Spent catalyst Anion exchange resin Metals recovery |
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