Ni-MOF-74制备及其对CO的吸附性能
Preparation of Ni-MOF-74 and Its Adsorption Property for CO
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摘要: 通过水热合成法制备了Ni-MOF-74材料，采用全自动表面积吸附仪、PXRD、扫描电子显微镜、同步热分析仪对材料的孔隙结构、晶体形貌和热稳定性进行了表征，并采用静态吸附法测定了CO、N2、CH4和CO2在Ni-MOF-74上的吸附等温线；采用挤压成型方法制备了Ni-MOF-74成型材料，并研究了挤压成型后Ni-MOF-74晶体结构和微孔结构的变化及对CO的吸附性能的影响。结果表明，制得的Ni-MOF-74材料比表面积达1 212.61 m2/g ，其孔径主要集中在0.8～1.0 nm之间，对CO的吸附量远高于相同条件下对N2和CH4的吸附量，具有良好的热稳定性；Ni-MOF-74对CO的吸附作用力明显高于对N2、CH4和CO2的；挤压成型后Ni-MOF-74的完整晶体数量明显减少，且部分微孔结构遭到破坏，成型后对CO的吸附性能明显下降。Abstract: Ni-MOF-74 materials were prepared by hydrothermal synthesis. The pore structure, crystal morphology and thermal stability of the materials were characterized by full automatic surface area adsorbent apparatus, PXRD, scanning electron microscopy and synchronous thermal analyzer. The adsorption isotherms of CO, N2, CH4 and CO2 on Ni-MOF-74 were determined by static adsorption method. The molding material of Ni-MOF-74 was prepared, and the changes of crystal structure and micro structure and the adsorption property for CO were studied. The results show that the specific surface area of the prepared Ni-MOF-74 material is as high as 1 212.61 m2/g, the pore size is mainly between 0.8-1.0 nm, the adsorption capacity of CO is much higher than that of N2 and CH4 under the same conditions, and it has good thermal stability. The adsorption force of CO by Ni-MOF-74 is significantly higher than that of N2, CH4 and CO2. The number of complete crystals of Ni-MOF-74 in extrusion samples decreases significantly, and some of the microporous structures are destroyed, and the adsorption properties of CO decrease significantly after extrusion.
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Keywords:
- Ni-MOF-74 ,
- extrusion molding ,
- CO
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