| 对苯二甲酸-锌配合物孔结构的研究 |
| Porous Structure Analysis of Terephthalic Acid-Zinc Complex |
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| 摘要: 以硝酸锌和对苯二甲酸为反应物，N,N′-二甲基甲酰胺(DMF)为溶剂，用溶剂热法合成出结构稳定的对苯二甲酸-锌配位化合物(MOF-L)。并采用XRD、TG、低温N2吸附等测试手段对合成的MOF-L进行了表征。结果表明，样品的孔径分布均呈双峰型，孔结构主要由孔径小于1 nm的微孔和少量1.5～2.0 nm的超微孔组成，且小于0.7 nm的极微孔丰富；其表面在极微孔和超微孔范围存在两种吸附位。300 ℃煅烧的样品，Langmuir比表面积和单点总孔容分别为1 243 m2·g-1和0.46 cm3·g-1，在77 K、1.0 bar时的储氢容量为1.3wt%。400 ℃煅烧后，骨架扭曲坍塌，Langmuir比表面积、总孔容及储氢容量分别下降为1 113 m2·g-1、0.43 cm3·g-1和0.8wt%。 |
| 关键词: 金属有机骨架 MOF-5 孔结构 储氢 |
| 基金项目: |
| Abstract: A terephthalic acid-zinc complex(MOF-L) was prepared by solvothermal reaction using zinc nitrate and H2BDC as the reactants, N, N′-dimethylformamide(DMF) as the solvent. The properties of the resulting products have been characterized by using XRD, TG and low temperature nitrogen adsorption-desorption techniques. The results show that the pore size is bimodal distribution with sizes of ≤1 nm and 1.5～2.0 nm. On surface of MOF-L, there are two binding sites in the ultramicropore and supermicropore range, respectively. Wide pore size distribution leads to wide surface energy distribution and more energy peaks, as well as the type of adsorption site. When calcined at 300 ℃, the Langmuir specific surface area and total pore volume(Vp(N2,0.995)) is respectively 1243 m2·g-1 and 0.46 cm3·g-1. The hydrogen adsorption capability is 1.3wt% at 77 k and 1 bar. When the calcination temperature is at 400 ℃, the Langmuir specific surface area、total pore volume and hydrogen adsorption capability decline to 1 113 m2·g-1, 0.43 cm3·g-1 and 0.8wt% respectively due to the collapse of the framework. |
| Keywords: metal-organic framework MOF-5 porous structure hydrogen storage |
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| 杨 儒,刘元斌,刘国强,李 敏.对苯二甲酸-锌配合物孔结构的研究[J].无机化学学报,2008,24(12):1962-1969. |
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