Ionic Couple-Driven Palladium Leaching by Organic Triiodide Solutions

Mariangela Cuscusa; Americo Rigoldi; Flavia Artizzu; Roberto Cammi; Paolo Fornasiero; Paola Deplano; Luciano Marchiò; Angela Serpe

doi:10.1021/acssuschemeng.7b00410

Ionic Couple-Driven Palladium Leaching by Organic Triiodide Solutions

Mariangela Cuscusa, Americo Rigoldi, Flavia Artizzu, Roberto Cammi, Paolo Fornasiero, Paola Deplano, Luciano Marchiò, Angela Serpe

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

Pd dissolution capabilities of a variety of organic triiodides (OrgI₃) in organic solvent, where Org⁺ = 3,5-bis(phenylamino)-1,2-dithiolylium [(PhHN)₂DTL⁺], 3,5-bis(morpholino)-1,2-dithiolylium (Mo₂DTL⁺); tetrabuthylammonium (TBA⁺); and tetraphenylphosphonium (Ph₄P⁺), toward the crude metal and model-spent three-way catalyst (TWC), are described here. Enhanced Pd-leaching yields from TWC were obtained using OrgI₃ solutions (up to 98%) in spite of the fully inorganic KI₃ one (38%) in the same mild conditions. The reaction products were isolated and characterized as Org₂[Pd₂I₆]. Crystallographic and DFT studies highlighted the presence of several ion-pair secondary interactions in the products, which can explain the improved effectiveness of the Pd etching by OrgI₃. For comparison purposes, the gold leaching by using R₂DTLI₃ and the obtained Au complexes were investigated. Preliminary results addressed to recover the metal and the reagents from the etching product showed that (PhHN)₂DTLI₃ is the most promising reagent to improve sustainability in the whole process.

Lingua originale	Inglese
pagine (da-a)	4359-4370
Numero di pagine	12
Rivista	ACS Sustainable Chemistry and Engineering
Volume	5
Numero di pubblicazione	5
DOI	https://doi.org/10.1021/acssuschemeng.7b00410
Stato di pubblicazione	Pubblicato - 1 mag 2017
Pubblicato esternamente	Sì

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10.1021/acssuschemeng.7b00410

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title = "Ionic Couple-Driven Palladium Leaching by Organic Triiodide Solutions",

abstract = "Pd dissolution capabilities of a variety of organic triiodides (OrgI3) in organic solvent, where Org+ = 3,5-bis(phenylamino)-1,2-dithiolylium [(PhHN)2DTL+], 3,5-bis(morpholino)-1,2-dithiolylium (Mo2DTL+); tetrabuthylammonium (TBA+); and tetraphenylphosphonium (Ph4P+), toward the crude metal and model-spent three-way catalyst (TWC), are described here. Enhanced Pd-leaching yields from TWC were obtained using OrgI3 solutions (up to 98%) in spite of the fully inorganic KI3 one (38%) in the same mild conditions. The reaction products were isolated and characterized as Org2[Pd2I6]. Crystallographic and DFT studies highlighted the presence of several ion-pair secondary interactions in the products, which can explain the improved effectiveness of the Pd etching by OrgI3. For comparison purposes, the gold leaching by using R2DTLI3 and the obtained Au complexes were investigated. Preliminary results addressed to recover the metal and the reagents from the etching product showed that (PhHN)2DTLI3 is the most promising reagent to improve sustainability in the whole process.",

keywords = "Dithiomalonamide, Ionic couple, Palladium, Polyhalides, Waste prevention",

author = "Mariangela Cuscusa and Americo Rigoldi and Flavia Artizzu and Roberto Cammi and Paolo Fornasiero and Paola Deplano and Luciano Marchi{\`o} and Angela Serpe",

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T1 - Ionic Couple-Driven Palladium Leaching by Organic Triiodide Solutions

AU - Cuscusa, Mariangela

AU - Rigoldi, Americo

AU - Artizzu, Flavia

AU - Cammi, Roberto

AU - Fornasiero, Paolo

AU - Deplano, Paola

AU - Marchiò, Luciano

AU - Serpe, Angela

PY - 2017/5/1

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AB - Pd dissolution capabilities of a variety of organic triiodides (OrgI3) in organic solvent, where Org+ = 3,5-bis(phenylamino)-1,2-dithiolylium [(PhHN)2DTL+], 3,5-bis(morpholino)-1,2-dithiolylium (Mo2DTL+); tetrabuthylammonium (TBA+); and tetraphenylphosphonium (Ph4P+), toward the crude metal and model-spent three-way catalyst (TWC), are described here. Enhanced Pd-leaching yields from TWC were obtained using OrgI3 solutions (up to 98%) in spite of the fully inorganic KI3 one (38%) in the same mild conditions. The reaction products were isolated and characterized as Org2[Pd2I6]. Crystallographic and DFT studies highlighted the presence of several ion-pair secondary interactions in the products, which can explain the improved effectiveness of the Pd etching by OrgI3. For comparison purposes, the gold leaching by using R2DTLI3 and the obtained Au complexes were investigated. Preliminary results addressed to recover the metal and the reagents from the etching product showed that (PhHN)2DTLI3 is the most promising reagent to improve sustainability in the whole process.

KW - Dithiomalonamide

KW - Ionic couple

KW - Palladium

KW - Polyhalides

KW - Waste prevention

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Ionic Couple-Driven Palladium Leaching by Organic Triiodide Solutions

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