Acta Phys. -Chim. Sin. ›› 2018, Vol. 34 ›› Issue (8): 896-903.doi: 10.3866/PKU.WHXB201711271

Special Issue: Green Chemistry

• ARTICLE • Previous Articles     Next Articles

Ultra-High SO2 Capture by Anion-Functionalized Resins through Multiple-Site Adsorption

Xi HE1,Xiaoyu LÜ1,Xi FAN1,Wenjun LIN1,Haoran LI1,2,Congmin WANG1,*()   

  1. 1 ZJU-NHU United R & D Center, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
    2 College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2017-10-27 Published:2018-04-03
  • Contact: Congmin WANG
  • Supported by:
    the National Key Basic Research Program of China (973)(2015CB251401);National Natural Science Foundation of China(21176205);National Natural Science Foundation of China(21322602);Zhejiang Provincial Natural Science Foundation of China(LZ17B060001);Fundamental Research Funds of the Central Universities


The anion-functionalization strategy has been proposed and applied for the synthesis of macro-porous resins [IRA-900][An], thus realizing anultra-high SO2 adsorption capacity (>10 mmol·g-1) at 101.3 kPa and 20 ℃. Compared with the normal azole-based anion-functionalized resins, the poly(imidazolyl)borate anion-functionalized resin [IRA-900][B(Im)4] exhibited an outstanding adsorption capacity at low SO2 partial pressures (10.62 mmol·g-1 at 20 ℃ and 10.13 kPa). From the results of the IR spectrum investigation and DFT calculations, the multiple-site adsorption mechanism was verified. On account of the unique tetrahedral configuration of [B(im)4], the conjugation and electronic communication between the electronegative nitrogen atoms were disrupted, making them behave as local reactive sites. Therefore, at least four electronegative nitrogen atoms could be provided by one [B(im)4] to react with SO2 without evident adsorption enthalpy deterioration (from -50.6 kJ·mol-1 to -37.2 kJ·mol-1) during the continuous SO2 capture; this was responsible for the ultra-high SO2 adsorption capacity achieved by [IRA-900][B(Im)4] at low partial pressures. Moreover, the thermal stability and reversibility of [IRA-900][B(Im)4] for SO2 capture and desorption were investigated. Six cycles where the adsorption was carried out at 20 ℃ and 10.13 kPa and the regeneration was performed at 70 ℃ demonstrated the adequate reversibility of [IRA-900][B(Im)4] for SO2 capture, showing the resin's great potential for industrial desulfurization. Thus, the anion-functionalization strategy and multiple-site adsorption behavior provide new perspectives to realize effective SO2 capture from flue gas.

Key words: Anion functionalized, Macro-porous resins, Poly(imidazolyl)borate anion, Multiple-site, SO2 capture