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<p>Efficient and environmentally friendly recovery of platinum group metals from secondary resources can facilitate a sustainable society. This study explores a two-step process for extracting Pt from catalyst materials: chlorination using ferric chloride (FeCl<sub>3</sub>) vapor followed by leaching using hydrochloric acid. When the catalyst sample prepared by mixing Pt black and alumina powder was leached with 1&#xa0;M HCl(<i>aq.</i>) at 313&#xa0;K (40&#xa0;°C) for 10&#xa0;min, Pt was hardly dissolved in the solution. By contrast, after exposure to FeCl<sub>3</sub> vapor at 573 ± 20&#xa0;K (300 ± 20&#xa0;°C) for 35&#xa0;min, 92% of the Pt was extracted under the same leaching conditions. Furthermore, when a commercial Pt catalyst powder was subjected to chlorination, virtually all the Pt was extracted during subsequent leaching. The reaction products of Pt and FeCl<sub>3</sub> vapor were examined through compositional analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy, and their crystalline structures were analyzed using X-ray diffraction. The products were identified as FePtCl<sub>6</sub> and FeCl<sub>2</sub>. By reacting with FeCl<sub>3</sub> vapor, Pt was converted into a complex chloride that is easily soluble in low-toxicity acids. Therefore, the proposed process can potentially improve the efficiency and environmental friendliness of Pt recovery from spent catalysts.</p> Graphical Abstract <p></p>

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Extraction of Platinum Using Ferric-Chloride-Vapor-Based Chlorination Followed by Hydrochloric Acid Leaching

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Yu-ki Taninouchi,
  • Kohei Sunagawa,
  • Toru H. Okabe,
  • Hiroaki Nakano

摘要

Efficient and environmentally friendly recovery of platinum group metals from secondary resources can facilitate a sustainable society. This study explores a two-step process for extracting Pt from catalyst materials: chlorination using ferric chloride (FeCl3) vapor followed by leaching using hydrochloric acid. When the catalyst sample prepared by mixing Pt black and alumina powder was leached with 1 M HCl(aq.) at 313 K (40 °C) for 10 min, Pt was hardly dissolved in the solution. By contrast, after exposure to FeCl3 vapor at 573 ± 20 K (300 ± 20 °C) for 35 min, 92% of the Pt was extracted under the same leaching conditions. Furthermore, when a commercial Pt catalyst powder was subjected to chlorination, virtually all the Pt was extracted during subsequent leaching. The reaction products of Pt and FeCl3 vapor were examined through compositional analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy, and their crystalline structures were analyzed using X-ray diffraction. The products were identified as FePtCl6 and FeCl2. By reacting with FeCl3 vapor, Pt was converted into a complex chloride that is easily soluble in low-toxicity acids. Therefore, the proposed process can potentially improve the efficiency and environmental friendliness of Pt recovery from spent catalysts.

Graphical Abstract