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

Bolin Wang; Yuxue Yue; Yuliang Li; Lu Yu; Hong Tang; Haifeng Zhang; Feng Feng

doi:10.1021/acsomega.2c07064

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

ACS Omega. 2023 Feb 21;8(9):8341-8345. doi: 10.1021/acsomega.2c07064. eCollection 2023 Mar 7.

Authors

Bolin Wang^{1

2}, Yuxue Yue², Yuliang Li¹, Lu Yu², Hong Tang³, Haifeng Zhang¹, Feng Feng²

Affiliations

¹ School of Chemical Engineering, Northeast Electric Power University, Jilin132012, China.
² Industrial Catalysis Institute, Zhejiang University of Technology, Hangzhou310014, China.
³ School of Automation Engineering, Northeast Electric Power University, Jilin132012, China.

Abstract

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.