改性Ni-MOF-74的微观结构及脱碳性能研究

Microstructure and Decarbonization Properties of Modified Ni-MOF-74

利用溶剂热合成法合成了Ni-MOF-74及Li-Ni-MOF-74,研究了其微观结构特征以及脱碳性能,进行了XRD表征、N2吸脱附实验以及CO2/N2动态穿透实验。结果表明,两种吸附剂的XRD图谱吻合,改性材料中金属Li的引入,增大晶面间距,BET比表面积分别为391.14、1 024.89 m^2/g,孔容积分别为0.346、0.645 cm^3/g,孔径分布均在0.7~1.2 nm。在298 K、0.1 MPa下,进气流速为50 mL/min时,Ni-MOF-74和Li-Ni-MOF-74的穿透时间分别为114、142 s,说明改性后的MOFs的吸附分离性能更好。

Ni⁃MOF⁃74 and Li⁃Ni⁃MOF⁃74 were synthesized by solvothermal method.The microstructure and decarburization properties of Ni⁃MOF⁃74 and modified Li⁃Ni⁃MOF⁃74 were studied.XRD,N2 adsorption and desorption experiments,and CO2/N2 dynamic penetration experiments were carried out.The results showed that the XRD patterns of the two adsorbents were consistent,and the introduction of metal Li in the modified material increases the interplanar spacing.The BET specific surface areas were 391.14,1024.89 m^2/g,respectively,the pore volumes were 0.346,0.645 cm^3/g,respectively,and the pore size distributions were all in the range of 0.7 to 1.2 nm.At 298 K and 0.1 MPa,when the inlet flow rate is 50 mL/min,the breakthrough times of Ni⁃MOF⁃74 and Li⁃Ni⁃MOF⁃74 were 114 s and 142 s,respectively,indicating that the modified MOFs had better adsorption and separation performance.