期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 192, 期 3, 页码 1155-1160出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.06.021
关键词
Platinum; Tin; Indium; Spent catalyst; Anion exchange resin; Metals recovery
资金
- CAPES
- Agencia Nacional de Petroleo (ANP)
- CNPq
This work describes a route for platinum recovery from spent commercial Pt and PtSnln/Al2O3 catalysts using strong basic mesoporous and macroporous anion exchange resins (Cl- form). The catalysts were leached with aqua regia (75 degrees 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%). (C) 2011 Elsevier B.V. All rights reserved.
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