Significantly promoted SO2 uptake by the mixture of N-methylated ethylene imine polymer and 1-ethyl-3-methylimidazolium tetrazolate

SO2 Capture Using Porous Organic Cages

“…This interaction causes the appearance of new SO2 vibrational bands, as reported for several amines where the formation of charge-transfer is verified. [51,52,54] As shown in Fig. 4a, the strongest vibrational frequencies are assigned to C=N, CH2, C-N, and C-H stretching modes at 1654 cm -1 , 1448 cm -1 , 1160 cm -1 and 690 cm -1 , respectively.…”

“…The experimental heat of adsorption values obtained for RCC3 and 6FT-RCC3 (82.78 and 43.03 kJ mol -1 , respective), are in good agreement with different N-based adsorbents such as diamines, [48] Merrifield resins, [49] ionic liquids, [50] and hybrid solvents. [51] The preferential adsorption binding site in all cases is the N atom, forming a charge-transfer complex with SO2 (N→SO2). [51,52] To corroborate the reversibility of the process, we carried out SO2 cyclability experiments on these materials.…”

“…[51] The preferential adsorption binding site in all cases is the N atom, forming a charge-transfer complex with SO2 (N→SO2). [51,52] To corroborate the reversibility of the process, we carried out SO2 cyclability experiments on these materials. In the case of RCC3, we only managed to obtain three partial adsorptiondesorption cycles of SO2 (activating under dynamic vacuum with and without heating, see ESI Fig.…”

SO2 Capture Using Porous Organic Cages

“…Theh igh Q st value for RCC3 indicates astrong bond between the functional R 2 N-H amine group in RCC 3 and SO 2 which suggests an almost irreversible chemisorption process.T he experimental heat of adsorption values obtained for RCC3 and 6FT-RCC3 (82.78 and 43.03 kJ mol À1 ,r espective), are in good agreement with different N-based adsorbents such as diamines, [47] Merrifield resins, [48] ionic liquids, [49] and hybrid solvents. [50] Thep referential adsorption binding site in all cases is the Na tom, forming ac harge-transfer complex with SO 2 (N!SO 2 ). [50,51] To corroborate the reversibility of the process,wecarried out SO 2 cyclability experiments on these materials.Inthe case of RCC3, we only managed to obtain three partial adsorptiondesorption cycles of SO 2 (activating under dynamic vacuum with and without heating, see ESI Figure S5).…”

“…[50] Thep referential adsorption binding site in all cases is the Na tom, forming ac harge-transfer complex with SO 2 (N!SO 2 ). [50,51] To corroborate the reversibility of the process,wecarried out SO 2 cyclability experiments on these materials.Inthe case of RCC3, we only managed to obtain three partial adsorptiondesorption cycles of SO 2 (activating under dynamic vacuum with and without heating, see ESI Figure S5). In fact, when RCC3 and 6FT-RCC3 were only activated under vacuum at room temperature,w eo bserved ad ecrease in SO 2 uptake after the first cycle in both cases.H owever, re-activation at 80 8 8Cunder vacuum for 6FT-RCC3 shows full retention of the adsorption capacity of SO 2 after 50 adsorption-desorption cycles at 298 K( Figure 3f or 6FT-RCC3 and Figure S6 for CC3).…”