TY - JOUR
T1 - Selective recovery of platinum group metals from spent automotive catalysts by leaching and solvent extraction
AU - Firmansyah, Mochamad L.
AU - Kubota, Fukiko
AU - Goto, Masahiro
N1 - Funding Information:
The authors express their sincere thanks to Prof. Kazuharu Yoshi-zuka and Prof. Syouhei Nishihama of the University of Kitakyushu for technical advice about the preparation of leachate. We also thank Prof. Hitoshi Ohya of the University of Kitakyushu for valuable suggestions about procurement of used automotive catalysts. We give thanks to Mr. Manabu Mizuhira of Bruker Japan K. K., for the elemental analysis of the catalyst by μXRF. This work was supported by a Grant-in-Aid for Science Research (No. JP19K05126) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Environment Research and Technology Development Fund (ERTDF, No. 3-1710) of the Ministry of the Environment, Japan. Mochamad L. Firmansyah is grateful for a scholarship from the Ministry of Education, Science, Sports and Culture of Japan (MEXT ID: 163644). We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
Funding Information:
The authors express their sincere thanks to Prof. Kazuharu Yoshizuka and Prof. Syouhei Nishihama of the University of Kitakyushu for technical advice about the preparation of leachate. We also thank Prof. Hitoshi Ohya of the University of Kitakyushu for valuable suggestions about procurement of used automotive catalysts. We give thanks to Mr. Manabu Mizuhira of Bruker Japan K. K., for the elemental analysis of the catalyst by ?XRF. This work was supported by a Grant-in-Aid for Science Research (No. JP19K05126) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Environment Research and Technology Development Fund (ERTDF, No. 3-1710) of the Ministry of the Environment, Japan. Mochamad L. Firmansyah is grateful for a scholarship from the Ministry of Education, Science, Sports and Culture of Japan (MEXT ID: 163644). We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
Publisher Copyright:
© 2019 The Society of Chemical Engineers, Japan
PY - 2019
Y1 - 2019
N2 - Platinum group metals (PGMs) play an important role in the automotive industry as key components of exhaust catalysts. Recycling of PGMs from secondary resources, such as waste products, is encouraged to ensure their sustainability. A highly efficient and environmentally benign technique for the separation of PGMs is currently required. In the present study, the recovery of PGMs from a spent automotive catalyst was investigated using the trioctyldodecyl phosphonium chloride (P8,8,8,12Cl) ionic liquid (IL) as the PGM extraction solvent. First, leaching from the catalyst was investigated. Pt and Pd are selectively extracted into undiluted P8,8,8,12Cl from the 5 mol L−1 HCl leachate containing various metals together with Pt, Pd, and Rh. Subsequently, Rh is extracted into fresh P8,8,8,12Cl from the raffinate adjusted to an appropriate HCl concentration. Mutual separation of Pt and Pd is possible by stripping processes. Some common metals co-extracted with PGMs, such as Fe, Cu, and Zn, are removed by each stripping process. Recovery of high purity Pt, Pd, and Rh is achieved by the proposed recycling process. The results demonstrate that separation using phosphonium-based ILs is useful for recycling PGMs.
AB - Platinum group metals (PGMs) play an important role in the automotive industry as key components of exhaust catalysts. Recycling of PGMs from secondary resources, such as waste products, is encouraged to ensure their sustainability. A highly efficient and environmentally benign technique for the separation of PGMs is currently required. In the present study, the recovery of PGMs from a spent automotive catalyst was investigated using the trioctyldodecyl phosphonium chloride (P8,8,8,12Cl) ionic liquid (IL) as the PGM extraction solvent. First, leaching from the catalyst was investigated. Pt and Pd are selectively extracted into undiluted P8,8,8,12Cl from the 5 mol L−1 HCl leachate containing various metals together with Pt, Pd, and Rh. Subsequently, Rh is extracted into fresh P8,8,8,12Cl from the raffinate adjusted to an appropriate HCl concentration. Mutual separation of Pt and Pd is possible by stripping processes. Some common metals co-extracted with PGMs, such as Fe, Cu, and Zn, are removed by each stripping process. Recovery of high purity Pt, Pd, and Rh is achieved by the proposed recycling process. The results demonstrate that separation using phosphonium-based ILs is useful for recycling PGMs.
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U2 - 10.1252/jcej.19we093
DO - 10.1252/jcej.19we093
M3 - Article
AN - SCOPUS:85076243725
VL - 52
SP - 835
EP - 842
JO - Journal of Chemical Engineering of Japan
JF - Journal of Chemical Engineering of Japan
SN - 0021-9592
IS - 11
ER -