Recovery of platinum, tin and indium from spent catalysts in chloride medium using strong basic anion exchange resins
Roberta Santos Marinho1, Cristiano Nunes da Silva, Julio Carlos Afonso
1Analytical 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.
Abstract:
This work describes a route for platinum recovery from spent commercial Pt and PtSnIn/Al(2)O(3) 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) Na(2)S(2)O(3) (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%).
Related Concept Videos
Ion-Exchange Chromatography
Ion Exchange
Extraction: Advanced Methods
Electrodeposition
Electrodeposition can...
Types Of Column Chromatography
Gel Filtration Chromatography
When the...
Precipitation and Co-precipitation


