scholarly journals Dissolution of noble metals in highly concentrated acidic salt solutions

2020 ◽  
Vol 56 (59) ◽  
pp. 8230-8232
Author(s):  
Federica Forte ◽  
Sofia Riaño ◽  
Koen Binnemans
Keyword(s):  
Noble Metals ◽  
Environmentally Friendly ◽  
Platinum Group Metals ◽  
Salt Solutions ◽  
Concentrated Solutions ◽  
Aqua Regia ◽  
Acidic Salt ◽  
Platinum Group

Highly concentrated solutions of AlCl3·6H2O and Al(NO3)3·9H2O are safer and more environmentally friendly alternatives to aqua regia for the dissolution of gold and platinum group metals (Pd, Pt, Rh).

CALCULATIONS OF THE ZEEMAN SPLITTING FOR PLATINUM GROUP METALS AND NOBLE METALS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 271-274 ◽  
Author(s):  
ANDERS HJELM
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electronic Structures ◽  
Noble Metals ◽  
Zeeman Splitting ◽  
Platinum Group Metals ◽  
Exchange Correlation ◽  
Orbital Magnetism ◽  
Platinum Group ◽  
Good Agreement

The electronic structures for Rh, Pd, Ir, Pt, Cu, Ag and Au are calculated including the effects of an external magnetic field, using the LMTO — ASA method. The field is included self consistently by adding the Zeeman term to the Hamiltonian in the variational step. The Zeeman splitting of cyclotron orbits on the Fermi surface as well as bulk susceptibilities are calculated for various exchange — correlation potentials. For the platinum group metals good agreement with experiments is found but for the noble metals effects creating orbital magnetism are exaggerated and the calculated susceptibilities as well as the cyclotron orbit Zeeman splitting are larger than the experimental data.

scholarly journals Recovery of Platinum Group Metals from Spent Automotive Catalysts Using Lithium Salts and Hydrochloric Acid

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6843
Author(s):  
Shunsuke Kuzuhara ◽  
Mina Ota ◽  
Ryo Kasuya
Keyword(s):  
Precious Metals ◽  
Lithium Ion ◽  
Platinum Group Metals ◽  
Leaching Rate ◽  
Electrolytic Solution ◽  
Matrix Component ◽  
Aqua Regia ◽  
Automotive Catalysts ◽  
Chlorine Gas ◽  
Platinum Group

The recovery of platinum group metals (PGMs) from waste materials involves dissolving the waste in an aqueous solution. However, since PGMs are precious metals, their dissolution requires strong oxidizing agents such as chlorine gas and aqua regia. In this study, we aimed to recover PGMs via the calcination of spent automotive catalysts (autocatalysts) with Li salts based on the concept of “spent autocatalyst + waste lithium-ion batteries” and leaching with only HCl. The results suggest that, when Li2CO3 was used, the Pt content was fully leached, while 94.9% and 97.5% of Rh and Pd, respectively, were leached using HCl addition. Even when LiF, which is a decomposition product of the electrolytic solution (LiPF6), was used as the Li salt model, the PGM leaching rate did not significantly change. In addition, we studied the immobilization of fluorine on cordierite (2MgO·2Al2O3·5SiO2), which is a matrix component of autocatalysts. Through the calcination of LiF in the presence of cordierite, we found that cordierite thermally decomposed, and fluorine was immobilized as MgF2.

scholarly journals Janus Nanocages of Platinum‐Group Metals and Their Use as Effective Dual‐Electrocatalysts

2021 ◽  
Vol 133 (18) ◽  
pp. 10472-10480
Author(s):  
Jiawei Zhu ◽  
Lang Xu ◽  
Zhiheng Lyu ◽  
Minghao Xie ◽  
Ruhui Chen ◽  
...  
Keyword(s):  
Platinum Group Metals ◽  
Platinum Group

scholarly journals Fundamental Study of Palladium Recycling Using “Dry Aqua Regia” Considering the Recovery from Spent Auto-catalyst

2021 ◽  
Author(s):  
Akihiro Yoshimura ◽  
Shunta Tochigi ◽  
Yasunari Matsuno
Keyword(s):  
Potassium Chloride ◽  
Platinum Group Metals ◽  
Recycling Process ◽  
Fundamental Study ◽  
Aqua Regia ◽  
Sodium Chloride Solutions ◽  
Pure Compounds ◽  
The Difference ◽  
Solid Liquid ◽  
Solid Liquid Separation

AbstractIn this research, a recycling process for palladium using “dry aqua regia,” which consists of iron(III) chloride–potassium chloride, was proposed. Palladium was dissolved in “dry aqua regia,” and the dissolved palladium was recovered by leaching with potassium chloride solution with added ammonium chloride and nitric acid. Palladium was almost completely dissolved in 3 h at 600 K, and the recovery ratio of dissolved palladium was up to 80%. In addition, the dissolution of palladium in coexistence with platinum and the dissolution of platinum-palladium alloy by “dry aqua regia” were also tested. The dissolved palladium and platinum were separated and recovered by solid–liquid separation technique using the difference in solubility of their compounds in potassium chloride and sodium chloride solutions. As a result, pure compounds of each element were recovered. This result suggested the possibility of using “dry aqua regia” for the separation of platinum-group metals. Graphical Abstract

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