“…ILs based on imidazolium ( Li et al, 2021a ; Doblinger et al, 2021 ), guanidinium ( Wang et al, 2007 ; Geng et al, 2022 ), and pyridinium ( Zeng et al, 2014 ; Yan et al, 2019 ) can physically dissolve the gas. In addition to experimental efforts ( Huang et al, 2014 ; Cui et al, 2020 ; Wang et al, 2021a ; Cui et al, 2021b ; Geng et al, 2021 ; Liu et al, 2022b ; Hou et al, 2022 ) and theoretical and computational studies ( Wang et al, 2007 ; Wang et al, 2022a ; Mohammadi et al, 2022 ) to investigate the solubility of gases in ILs, ab initio and first principle investigations have also been conducted to inspect the structure and mechanism of the complex of IL and SO 2 gas ( Gu et al, 2013 ; Herrera et al, 2017 ; Cui et al, 2020 ; Wang et al, 2020 ; Li et al, 2021a ; Li et al, 2021b ; Yin et al, 2021 ; Zhu et al, 2021 ; Liu et al, 2022b ). For example, Wang et al (2007) simulated the solubility of CO 2 and SO 2 in guanidium-based IL and Zhang et al (2020) investigated the stability effect of ILs during the CO 2 absorption process in the presence of SO 2 .…”