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Optimization of ultrasonic enhanced chloride-hydrogen peroxide system for leaching platinum from propane dehydrogenation spent catalyst by response surface methodology

Liu, Wen ; Xu, Yingjie ; Yang, Quan ; Li, Yong ; Xia, Hongying ; Wu, Xilong ; Zhang, Libo

Separation and purification technology, 2025-01, Vol.353, p.128384, Article 128384 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Optimization of ultrasonic enhanced chloride-hydrogen peroxide system for leaching platinum from propane dehydrogenation spent catalyst by response surface methodology
  • Autor: Liu, Wen ; Xu, Yingjie ; Yang, Quan ; Li, Yong ; Xia, Hongying ; Wu, Xilong ; Zhang, Libo
  • Assuntos: Cycle ; Platinum ; Propane dehydrogenation ; Response surface methodology ; Toxicity
  • É parte de: Separation and purification technology, 2025-01, Vol.353, p.128384, Article 128384
  • Descrição: •A new technology for recovering Pt from spent propane dehydrogenation catalyst was proposed.•Pt is rapidly dissolved in the form of [PtCl6]2− in HCl-H2O2-NaClO3-AlCl3 system.•The optimized results of the BBD model are close to the experimental results.•The Al2O3 in the final residue has a higher purity compared to the raw material. Based on the environmental pressure and the resource wastage caused by the spent catalyst of propane dehydrogenation, a novel approach for the comprehensive treatment of spent catalyst was proposed, which first pulverizing the waste catalyst, and then recovered platinum by chloride-hydrogen peroxide system. The results show that in the HCl-H2O2-NaClO3-AlCl3 system, the addition of AlCl3 can supplement the loss of chloride ions during the reaction. The addition of H2O2 and NaClO3 to HCl not only significantly increases the electrode potential of the reaction system, but also produces Cl2, which promotes the reaction between Pt and Cl2 and dissolves in the form of [PtCl6]2−. In addition, the addition of NaClO3 can also reduce the concentration of HCl and avoid waste. In the actual experimental process, a maximum platinum leaching rate of 96.91 % was achieved, representing a 15.00 % increase compared to conventional leaching methods. The results of Box–Behnken design (BBD) optimization showed that under the conditions of hydrochloric acid concentration of 5 mol/L, reaction temperature of 90 °C, reaction time of 150 min and ultrasonic power of 400 W, the actual leaching rate of Pt and the leaching rate predicted by the quadratic regression model were 97.17 % and 97.26 %, respectively, and the error between the two was less than 0.10 %. The characterization results of the residue showed that the process significantly reduced the toxicity of the residue while increasing the leaching rate of Pt, alleviated the environmental pressure caused by waste stacking, and enriched Al2O3 in the slag phase with high purity for further recycling.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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