Preparation, characterization and CO2 adsorption of ion exchange resin supported solid amine adsorbents
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摘要: 以离子交换树脂（D001）为载体，四乙烯五胺（TEPA）为改性剂，采用三种不同的方法制备了一系列固态胺吸附剂。采用N2吸附-脱附、傅里叶变换红外光谱（FT-IR）、热重分析（TGA）等手段对吸附剂进行表征。在固定床反应器中考察了TEPA负载量、吸附温度、进气流量和CO2分压等因素对CO2吸附性能的影响。结果表明，配位法制得的固态胺吸附剂分散性和稳定性较好，且在TEPA负载量为40%，吸附温度为65℃，进气流量为40 mL/min时有最大CO2吸附量达4 mmol/g。经过10次吸附-脱附循环实验后，CO2吸附量下降3.98%。热力学、动力学研究结果表明，CO2吸附是物理吸附和化学吸附的结果。Abstract: A series of solid amine adsorbents were prepared by using three different preparation methods with ion exchange resin (D001) as carrier and with tetraethylenepentamine (TEPA) as modifier. The sorbents were characterized by nitrogen adsorption/desorption, Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) techniques. The effects of TEPA loadings, adsorption temperatures, influent gas flow rates and CO2 partial pressure on the CO2 adsorption capacity in a fixed bed reactor were investigated. The results show that the solid amine adsorbent prepared by the coordination method has a better dispersibility and stability, and the maximum CO2 adsorption capacity is 4 mmol/g when the TEPA loading is 40%, the adsorption temperature is 65 ℃ and the influent gas flow rate is 40 mL/min. The amount of CO2 adsorption only decreases by 3.98% and remains almost unchanged after 10 cycles of desorption and desorption. The study of thermodynamics and kinetics indicates that the adsorption mechanism is dominated by both chemical and physical adsorption.
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Key words:
- ion exchange resin /
- tetraethylenepentamine /
- CO2 adsorption
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图 1 不同制备方法和不同TEPA负载量下吸附剂的FT-IR谱图
Figure 1 FT-IR spectra of adsorbent with different preparation methods(a) and TEPA loadings(b)
图 2 不同制备方法制得的吸附剂的TGA曲线
Figure 2 TGA curves of adsorbent with different preparation methods
图 3 不同制备方法制得的吸附剂的孔径分布
Figure 3 Pore size distributions of adsorbent with different preparation methods
图 4 不同制备方法和不同TEPA负载量下吸附剂的CO2吸附穿透曲线
Figure 4 CO2 adsorption breakthrough curves of adsorbent with different preparation methods and TEPA loadings
图 5 不同制备方法和不同TEPA负载量下吸附剂的CO2吸附能力和胺利用率
Figure 5 CO2 adsorption capacity (a) and amine utilization (b) of different preparation methods and TEPA loading adsorbents
图 6 不同温度时D001-Cu-40%TEPA的CO2吸附量
Figure 6 CO2 adsorption capacity of D001-Cu-40%TEPA at different temperatures
图 7 不同进气流量时D001-Cu-40%TEPA的穿透曲线和CO2吸附量
Figure 7 Breakthrough curves (a) and CO2 adsorption capacity (b) of D001-Cu-40%TEPA at different influent gas velocities
图 8 D001-30%TEPA、D00-H-30%TEPA和D001-Cu-40%TEPA对CO2的循环吸附量
Figure 8 Cyclic CO2 adsorption capacity of D001-30%TEPA, D001-H-30%TEPA and D001-Cu-40%TEPA
图 9 不同吸附量时lnp对1/T的回归线
Figure 9 Regression lines of lnp versus 1/T at different adsorbing capacities
图 10 D001-Cu-40%TEPA的吸附量实验数据与动力学模型拟合
Figure 10 Experimental adsorption capacity of D001-Cu-40%TEPA and its corresponding fitting curves with kinetic models
表 1 不同制备方法制得的吸附剂的孔结构参数
Table 1 Pore structural parameters of adsorbent with different preparation methods
表 2 在不同温度下CO2分压对D001-Cu-40%TEPA吸附性能的影响
Table 2 Effect of CO2 partial pressure on the adsorption performance of D001-Cu-40%TEPA
表 3 D001-Cu-40%TEPA对CO2的等量吸附热
Table 3 Isosteric heat of CO2 adsorption on D001-Cu-40%TEPA
表 4 D001-Cu-40%TEPA的CO2吸附动力学模型拟合参数
Table 4 Parameters of kinetic models for CO2 adsorption of D001-Cu-40%TEPA
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