采用浸渍法将聚乙烯亚胺(PEI)负载到MIL-101(Cr)上.采用X线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、热分析仪(TG)和N2吸附脱附对改性MIL-101(Cr)吸附剂进行表征.测试改性MIL-101(Cr)吸附剂在101.3 kPa、25℃条件下对CO2和CH4的吸附量,分析PEI负载量和CO2吸附量与改性MIL-101(Cr)吸附剂的孔径、孔容、比表面积的关系.结果表明:与未改性的MIL-101(Cr)相比,PEI负载量为3.0 mmol的改性MIL-101(Cr)吸附剂对CO2的吸附量由74.6 cm3/g提升到114.3 cm3/g,对CH4的吸附量由11.8 cm3/g降至8.0 cm3/g,改性MIL 101(Cr)吸附剂大大提高了CO2/CH4的分离性能.改性MIL-101(Cr)吸附剂在80℃、533.12 Pa条件下处理即可完全脱附再生,循环5次对CO2的吸附性能基本不变.%Polyethyleneimine (PEI) was loaded onto MIL?101(Cr) by an impregnation method.Crystal structure and properties of modified MIL?101( Cr) as an adsorbent were characterized by X?ray diffraction (XRD),Fourier transform infrared spectroscopy (FT?IR),thermal gravimetric analysis (TG),and N2 adsorption?desorption technologies.The adsorption capacities of CO2 and CH4 on modified MIL?101( Cr) were measured at 25℃ and till 101. 3 kPa,and the relationship between PEI loading,adsorption capacity of CO2 and pore size,pore volume,surface area of modified MIL?101(Cr) was discussed.Results showed that,compared with original MIL?101(Cr),modified MIL?101(Cr) with 3 mmol PEI loading improved the adsorption capability of CO2,from 74. 6 cm3/g to 114. 3 cm3/g,while adsorption capability of CH4 was decreased,from 11. 8 cm3/g to 8. 0 cm3/g,and the separation performance for CH4/CO2 was greatly increased.The modified MIL?101(Cr) adsorbent could be completely regenerated under 533. 12 Pa at 80℃.The adsorption performance of CO2 for the 5 cycles was almost unchanged.
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