Supercritical CO₂ preparation of SBA-15 supported ionic liquid and its adsorption for CO₂

Homogeneous and Heterogeneous Ionic Liquid System: Promising “Ideal Catalysts” for the Fixation of CO2 into Cyclic Carbonates

“…Hence SILs could possess both advantages of homogeneous and heterogeneous catalysts, theoretically. To immobilize ILs into supports, both physical methods (such as impregnation method, [58] co-assembly method, [92] sol-gel method, [56] SFD method [54,[93][94] ) and chemical methods (such as covalent grafting method [43] ) were carried out. The physical methods could retain the original properties of ILs but suffered leaching problems.…”

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

“…Physically modified IL-based adsorbents are commonly synthesized by impregnation method, [49][50][51][52] supercritical fluid deposition (SCFD) method, 53,54 physical stirring method, 55 and so on, 56,57 in which there is Van der Waals force or noncovalent interaction between ILs and supports. 58,59 Physically modified IL-based adsorbents can be divided…”

“…In addition to the impregnation method, other supported IL adsorbents can also be obtained by the SCFD method 54 and other methods. 72 For the SCFD method, since supercritical carbon dioxide (scCO 2 ) has low surface tension and can dissolve ILs by adding little cosolvent to lower the viscosity of IL, the IL loading and dispersion are improved compared to those prepared by the impregnation method with higher CO 2 capacity.…”

“…73 Moreover, Wu et al 74 found that when there is polar organic compounds such as acetone and ethanol, the IL will be dramatically dissolve in scCO 2 , especially adding more than 10 mol% of the compounds in scCO 2 . Yin et al 54 The supported conventional IL adsorbents are summarized in Table 1. The adsorption of CO 2 by conventional ILs is mainly based on F I G U R E 6 Dynamic CO 2 uptake capacity for SBA-15 (green), nonfunctionalized IL ET (gray), EZT3 (black), and EZT3@SBA-15 with different IL loadings: 10 wt% (cyan), 25 wt% (dark blue), 50 wt% (red), and 80 wt% (pink).…”

Preparation of Supported Ionic Liquid Membranes Using a Supercritical Fluid Deposition Method and Study of the Capillary Phase Transition of Ionic Liquids in Supercritical CO2

“…The supercritical fluid deposition (SCFD) method takes advantage of these properties of CO 2 to dissolve metal ions and deposit them into the nanopores of carriers. Nanocomposites prepared using the SCFD method generally show a more even distribution of metal particles. − This leads to the question of whether it is possible to use the SCFD method to deposit ILs into nanopores of supports more uniformly and to prepare SILMs with higher CO 2 /N 2 selectivity. Our previous study demonstrated that SILMs based on [BMIM]­[BF 4 ] could be prepared using the SCFD method with scCO 2 as the solvent and ethanol as the cosolvent.…”