Noble Metals Dissolution Catalyzed by [AlCl4-]-Based Ionic Liquids

Imidazolium-based ionic liquid mixtures with [NO3]- and [AlCl4]- anions were used as oxidizing agents for the dissolution of Au, Pd, and Pt metals under mild conditions. The thermodynamic reduction of [NO3]- to [NO] is catalyzed by [AlCl4]- anions and coupled with the oxidation process of noble metals. The developed ionic liquid system for dissolving Au can reactivate the Au0 formed in the deactivation process of the catalyst in vinyl chloride production. This demonstrates the relevance of the here-presented work for technical noble metal recycling.

Automated summary

Imidazolium-based ionic liquid mixtures with [NO3]- and [AlCl4]- anions were employed as mild oxidizing agents to dissolve Au, Pd, and Pt metals. The thermodynamic reduction of [NO3]- to [NO] was catalyzed by [AlCl4]- anions and coupled with the oxidation process of noble metals. The developed ionic liquid system could reactivate Au0 formed during catalyst deactivation in vinyl chloride production, indicating the significance of this work for technical noble metal recycling.