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<p>The spent automobile catalytic convertor (SACC) is the important secondary metal resource of the platinum group of metals (PGMs) because it is coated with platinum (Pt), palladium (Pd), and rhodium (Rh). This study is focused on the recovery of PGMs and Ce from SACC using two different hydrometallurgical approaches (route A and route B). In route A, the finely ground SACC powder was roasted (with sodium hydroxide in ratio of 1:3) at 700°C for 2&#xa0;h and the resulting residue was leached distilled water at 80°C for about 1&#xa0;h. After water leaching, the residue was leached using organic acids (2-picolonic acid, malic acid, and citric acid). About 65% Pt, 67% Pd, and 23% Ce were leached in 0.1&#xa0;M citric acid with a solid-to-liquid ratio (S/L) of 50&#xa0;g/L at 80°C, and leaching time 12&#xa0;h. The 77% of Ce which remained undissolved was present in residue form. In route B, 1&#xa0;g of pretreated SACC was leached using a mixture of 2&#xa0;M tartaric acid and 0.3&#xa0;M ascorbic acid (6.67:1) with an S/L of 10&#xa0;g/L at 80°C for 6&#xa0;h. About 77.5% of the Ce was selectively leached from the SACC.</p>

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Ecofriendly Recovery of Pt, Pd, and Ce from Spent Automobile Catalytic Converter Using Dilute Organic Acids

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Bhagyashree Uppin,
  • Hammad Nazir,
  • Jayappa Manjanna

摘要

The spent automobile catalytic convertor (SACC) is the important secondary metal resource of the platinum group of metals (PGMs) because it is coated with platinum (Pt), palladium (Pd), and rhodium (Rh). This study is focused on the recovery of PGMs and Ce from SACC using two different hydrometallurgical approaches (route A and route B). In route A, the finely ground SACC powder was roasted (with sodium hydroxide in ratio of 1:3) at 700°C for 2 h and the resulting residue was leached distilled water at 80°C for about 1 h. After water leaching, the residue was leached using organic acids (2-picolonic acid, malic acid, and citric acid). About 65% Pt, 67% Pd, and 23% Ce were leached in 0.1 M citric acid with a solid-to-liquid ratio (S/L) of 50 g/L at 80°C, and leaching time 12 h. The 77% of Ce which remained undissolved was present in residue form. In route B, 1 g of pretreated SACC was leached using a mixture of 2 M tartaric acid and 0.3 M ascorbic acid (6.67:1) with an S/L of 10 g/L at 80°C for 6 h. About 77.5% of the Ce was selectively leached from the SACC.