阴离子功能化大孔树脂用于二氧化硫的多位点高效捕集

doi:10.3866/PKU.WHXB201711271

物理化学学报

2018, Vol. 34

Issue (8): 896-903 DOI: 10.3866/PKU.WHXB201711271

所属专题：绿色化学

论文

阴离子功能化大孔树脂用于二氧化硫的多位点高效捕集

贺熙¹,吕逍雨¹,樊喜¹,林文俊¹,李浩然^1,²,王从敏^1,*(

)

¹ 浙江大学化学系，浙大-新和成联合研发中心，杭州 310027
² 浙江大学化学工程与生物工程学院，杭州 310027

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

Xi HE¹,Xiaoyu LÜ¹,Xi FAN¹,Wenjun LIN¹,Haoran LI^1,²,Congmin WANG^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

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摘要：

提出了一种针对大孔树脂阴离子功能化的新策略并合成了一系列阴离子功能化大孔树脂[IRA-900][An]，在20 ℃和101.3 kPa的吸附条件下实现了对SO₂的超高吸附容量(> 10 mmol·g^-1)。和常规唑基阴离子功能化大孔树脂相比，聚咪唑基硼酸阴离子功能化的大孔树脂[IRA-900][B(Im)₄]在低压条件下仍然展现了卓越的SO₂捕集能力。吸附实验发现，[IRA-900][B(Im)₄]在10.13 kPa和20 ℃的低压环境中能够保持10.62 mmol·g^-1的超高SO₂吸附量。通过红外谱学研究以及密度泛函理论(DFT)计算来进行吸附机理探究，发现聚唑基硼酸阴离子[B(Im)₄]具有独特的正四面体构型，从而打破了阴离子上N负位点之间的电子流动和共轭效应。在[IRA-900][B(Im)₄]捕集SO₂过程中，阴离子连续和SO₂分子发生化学相互作用时，吸附焓变无明显下降。因此，一个[B(Im)₄]阴离子能够提供四个有效的作用位点和SO₂发生化学吸附作用，从而在低压条件下，[IRA-900][B(Im)₄]仍然实现了超高的SO₂捕集能力。此外，我们对阴离子功能化大孔树脂[IRA-900][B(Im)₄]在低压条件下对SO₂吸附的循环稳定性做了探究。结果发现，在20 ℃和10.13 kPa的吸附环境中以及70 ℃的脱附条件下，[IRA-900][B(Im)₄]展现了良好的循环稳定性，具有极大的工业应用价值。最后，这种阴离子功能化的策略以及多位点捕集方法对实现烟气环境中SO₂的高效捕集开拓了新的思路。

关键词： 阴离子功能化; 大孔树脂; 聚咪唑基硼酸阴离子; 多位点均一型; SO₂捕集

Abstract:

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

收稿日期: 2017-10-27 出版日期: 2017-11-27

中图分类号:

O641

基金资助: 国家重点基础研究发展规划项目(973)(2015CB251401);国家自然科学基金项目(21176205);国家自然科学基金项目(21322602);浙江省自然科学基金项目(LZ17B060001);中央高校基本科研业务费专项资金资助

通讯作者: 王从敏 E-mail: chewcm@zju.edu.cn

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引用本文:

贺熙,吕逍雨,樊喜,林文俊,李浩然,王从敏. 阴离子功能化大孔树脂用于二氧化硫的多位点高效捕集[J]. 物理化学学报, 2018, 34(8): 896-903, 10.3866/PKU.WHXB201711271

Xi HE,Xiaoyu LÜ,Xi FAN,Wenjun LIN,Haoran LI,Congmin WANG. Ultra-High SO₂ Capture by Anion-Functionalized Resins through Multiple-Site Adsorption. Acta Phys. -Chim. Sin., 2018, 34(8): 896-903, 10.3866/PKU.WHXB201711271.

链接本文:

http://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201711271 或 http://www.whxb.pku.edu.cn/CN/Y2018/V34/I8/896

Scheme 1 Structures of the anion functionalized macro-porous resins for SO2 capture

Fig 1 Infrared spectrum of each anion functionalized resin using the ATR method blue: [IRA-900][B(Im)4]; green: [IRA-900][Triz]; red: [IRA-900][Tetz]; grey: [IRA-900][Cl]. Color online

Table 1 Structural features and nitrogen content for the original resin [IRA-900][Cl] and anion functionalized resins [IRA-900][An]

Table 2 SO2 adsorption capacity of the anion functionalized resin

Fig 2 SO2 adsorption curves by anion functionalized resins at 10.13 kPa and 20 ℃ blue:[IRA-900][B(Im)4]; green: [IRA-900][Triz]; red:[IRA-900][Tetz]; black: [IRA-900][Cl]. Color online

Fig 3 Infrared spectrum of [IRA-900][B(Im)4] during the SO2 capture process (grey) fresh [IRA-900][B(im)4] without SO2; (red) [IRA-900][B(Im)4] with SO2 adsorbed at 10.13 kPa and 20 ℃; (blue) [IRA-900][B(Im)4] regenerated at 70 ℃ with N2 atmosphere for 30 min

Fig 4 Optimized structures of simplified [B(Im)4]-SO2 complexes at the B3LYP/6-31++G(d, p) level adsorption enthalpies for SO2: (a) [B(Im)4]-SO2, ΔH = -50.6 kJ·mol-1; (b) [B(Im)4]-2SO2, ΔH = -45.3 kJ·mol-1; (c)[B(Im)4]-3SO2, ΔH = -42.7 kJ·mol-1; (d) [B(Im)4]-4SO2, ΔH = -37.2 kJ·mol-1

Fig 5 SO2 adsorption/desorption by [IRA-900][B(Im)4] for 6 cycles SO2 adsorption was carried out at 10.13 kPa and 20 ℃, desorption was performed at 70 ℃ under N2 atmosphere

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