Investigation of low concentration SO2 adsorption performance on different amine-modified Merrifield resins

SO2 Capture Using Porous Organic Cages

“…The high Qst value for RCC3 indicates a strong bond between the functional R2N-H amine group in RCC3 and SO2 which suggests an almost irreversible chemisorption process. 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).…”

“…These results show that the SO2 affinity follows the trend: tertiary amine > secondary amine > imine, in good agreement with the basicities of the cage. [49] The corroborates that the inclusion of tertiary amines in these porous materials allows higher SO2 uptake. It is also worth noting that structure of 6FT-RCC3 is intact after 50 SO2 adsorption-desorption cycles as confirmed by solution NMR experiments (ESI, Fig.…”

SO2 Capture Using Porous Organic Cages

“…However, re‐activation at 80 °C under vacuum for 6FT‐RCC3 shows full retention of the adsorption capacity of SO 2 after 50 adsorption‐desorption cycles at 298 K (Figure 3 for 6FT‐RCC3 and Figure S6 for CC3). These results show that the SO 2 affinity follows the trend: tertiary amine > secondary amine > imine, in good agreement with the basicities of the cage [48] . The corroborates that the inclusion of tertiary amines in these porous materials allows higher SO 2 uptake.…”

“…[46] Theh eat of adsorption at zero coverage for each sample is shown in Table 1. 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 ).…”

“…These results show that the SO 2 affinity follows the trend:t ertiary amine > secondary amine > imine,i ng ood agreement with the basicities of the cage. [48] Thecorroborates that the inclusion of tertiary amines in these porous materials allows higher SO 2 uptake.Itisalso worth noting that structure [d] 11.84 -MFM-170 [43] 17.5 1.27 35.4 SIFSIX-3-Zn [44a] 2.1 (1.68) [b] -4 5.2 SIFSIX-3-Ni [44a] 2.74 (2.43) [b] 0.86 43.2 SIFSIX-1-Cu [44a] 11.01 (3.43) [b] 1.64 36.1 SIFSIX-2-Cu-i [44a] 6.9 (4.16) [b] 1. 43 38.1 P(Ph-4MVIm-Br) [44b] 8.12 (2.43) [b] 4.34 76-65.2 [e] PI-COF-m [51c] 6.5 --…”