Recovery of precious metals from spent automobile catalytic converters using supercritical carbon dioxide

Faisal, Muhammad; Atsuta, Yoichi; Daimon, Hiroyuki; Fujie, Koichi

doi:10.1002/apj.156

Cited by 33 publications

(10 citation statements)

References 29 publications

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“…In recent car catalytic converters, Pt concentration ranges from 300 to 1000 μg·g − 1 ; for Pd, the concentration ranges from 200 to 800 μg·g − 1 ; and for rhodium, they vary from 50 to 120 μg·g − 1 . erefore, in all cases, the percentage of total content of PGMs in the samples should always be smaller than 0.1% [4].…”

Section: Introductionmentioning

confidence: 94%

“…Spent catalytic converters are good candidates for such requirement. Several works have been conducted to recover PGMs from spent catalytic converters using different metallurgical and refining methods through the use of smelting furnaces, hydrogen pretreatment, and/or direct leaching of PGMs [4,[7][8][9]. Several leaching processes have been developed based on the selective dissolution of the honeycomb unit consisting of PGMs after its crushing and milling [10].…”

Section: Introductionmentioning

confidence: 99%

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Recovery and Then Individual Separation of Platinum, Palladium, and Rhodium from Spent Car Catalytic Converters Using Hydrometallurgical Technique followed by Successive Precipitation Methods

Yousif

2019

Journal of Chemistry

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Recovery of PGMs (especially rhodium, platinum, and palladium) from different spent manufactured products (like catalytic converters) is considered as an important task as they are rarely found in nature, and they possess high economic value. In this work, the honeycomb of a car catalytic converter was primarily processed by crushing, grinding, and then treating in a hydrogen atmosphere. In order to establish an economic and ecofriendly method for the recovery of studied PGMs, different experimental conditions of changing HCl/H2O2 (as a leaching solution) ratio, temperature, and contact time were studied through batch experiments to obtain the optimum leaching conditions. The use of 0.8 vol% H2O2 and 9.0 M HCl mixture at 60°C for a contact time of 2.5 hours during the leaching process may be considered as the best conditions to be followed to save chemicals, energy, and time (about 86%, 96%, and 98% of Rh, Pt, and Pd were recovered, respectively). Individual separation of PGM ions from each other using precipitation technique from their leaching liquor was performed where % purity values of 99.5, 99.3, and 95.5 were obtained for Pt, Pd, and Rh, respectively.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Recovery and Then Individual Separation of Platinum, Palladium, and Rhodium from Spent Car Catalytic Converters Using Hydrometallurgical Technique followed by Successive Precipitation Methods

Yousif

2019

Journal of Chemistry

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“…Therefore, there is a need to produce fish oil supplements with lower levels of contamination. Supercritical fluid extraction (SFE) has been extensive ly used to remove metal ions from various solid and liquid matrices of environmental samples ( 7,19). SFE has progressed recently as an effective extraction method in food industries, mostly due to the lower health and environmental hazards involved.…”

Section: )mentioning

confidence: 99%

Effect of Supercritical Fluid Extraction on the Reduction of Toxic Elements in Fish Oil Compared with Other Extraction Methods

Hajeb

Selamat

Afsah‐Hejri

et al. 2015

Journal of Food Protection

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High-quality fish oil for human consumption requires low levels of toxic elements. The aim of this study was to compare different oil extraction methods to identify the most efficient method for extracting fish oil of high quality with the least contamination. The methods used in this study were Soxhlet extraction, enzymatic extraction, wet reduction, and supercritical fluid extraction. The results showed that toxic elements in fish oil could be reduced using supercritical C 0 2 at a modest temperature (60°C) and pressure (35 MPa) with little reduction in the oil yield. There were significant reductions in mercury (85 to 100%), cadmium (97 to 100%), and lead (100%) content of the fish oil extracted using the supercritical fluid extraction method. The fish oil extracted using conventional methods contained toxic elements at levels much higher than the accepted limits of 0.1 pg/g.

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“…Typical methods for collection of noble metals from water are solvent extraction [7][8][9][10][11][12], adsorption [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], and electrochemical processes [32]. e collection by adsorption is advantageous owing to its low cost, safety, and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

Kinemuchi

Ochiai

2018

Advances in Materials Science and Engineering

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Novel hydrophilic sulfur-containing adsorbents for noble metals were prepared by the radical terpolymerization of a methacrylate bearing dithiocarbonate moieties (DTCMMA), hydrophilic monomers, and a cross-linker. e resulting adsorbents efficiently and selectively adsorbed noble metals (Au, Ag, and Pd) from various multielement aqueous solutions at room temperature owing to the thiocarbonyl group having high affinity toward noble metals. e metal adsorption by the adsorbents was proceeded by simple mixing followed by filtration.e noble metal selectivity of the adsorbent obtained from DTCMMA and N-isopropylacrylamide was higher than that of the adsorbent obtained from DTCMMA and N,N-dimethylacrylamide due to the lower nonspecific adsorption.

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Recovery of precious metals from spent automobile catalytic converters using supercritical carbon dioxide

Cited by 33 publications

References 29 publications

Recovery and Then Individual Separation of Platinum, Palladium, and Rhodium from Spent Car Catalytic Converters Using Hydrometallurgical Technique followed by Successive Precipitation Methods

Recovery and Then Individual Separation of Platinum, Palladium, and Rhodium from Spent Car Catalytic Converters Using Hydrometallurgical Technique followed by Successive Precipitation Methods

Effect of Supercritical Fluid Extraction on the Reduction of Toxic Elements in Fish Oil Compared with Other Extraction Methods

Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

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