Recovery of Pd as PdO from Pd/SiO2 catalyst by leaching using hydrochloric acid
- Authors
- Kim, Ye Eun; Byun, Mi Yeon; Lee, Kwan-Young; Lee, Man Sig
- Issue Date
- 7월-2021
- Publisher
- SPRINGER
- Keywords
- Hydrometallurgy; Leaching; Palladium; Pd; SiO2 catalyst; Recovery; Recycle
- Citation
- JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT, v.23, no.4, pp.1657 - 1664
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
- Volume
- 23
- Number
- 4
- Start Page
- 1657
- End Page
- 1664
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/127784
- DOI
- 10.1007/s10163-021-01249-w
- ISSN
- 1438-4957
- Abstract
- The recovery of Pd from spent catalysts has been gaining attention due to its high economic value and limited availability in nature. To recover and reuse Pd, leaching in HCl-H2O2 media and recovery of Pd from the Pd/SiO2 catalyst were investigated. The Pd/SiO2 catalyst was leached using 3 M HCl solution with different concentrations of H2O2; then 0.5 M NaOH was added to precipitate the Pd ions. The leaching parameters were as follows: temperature, time, H2O2 concentration, and pulp density. A 100% leaching efficiency of Pd was obtained through the addition of 5 vol% H2O2 in 3 M HCl at pulp density of 50 g/L at 80 degrees C for 120 min. Complete recovery of Pd was obtained at a pH = 9 due to the hydrolysis of Pd. These results indicate that the leaching time and presence of H2O2 played a key role in the stable formation of aqueous Pd-Cl complexes and in improving the mass transfer efficiency. The palladium powder obtained was palladium oxide, and the purity of palladium oxide was 86.6%. Consequently, it is expected that the obtained PdO powder can be utilized in glass, ceramic, and catalyst applications.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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