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利用水热二次生长法制备用于H2/CO2分离的KAUST-8膜

作者：asad sharif，王泓博，鲁金明，杨建华，刘毅

单位：大连理工大学吸附与无机膜研究所，精细化工国家重点实验室

关键词： CO2分离； KAUST-8膜；氟化金属有机框架膜；水热合成； H2纯化

DOI号： 10.16159/j.cnki.issn1007-8924.2024.05.011

分类号： TQ028.8

出版年,卷(期):页码： 2024,44(5):90-99

摘要：

KAUST-8纳米片比表面积和孔隙率较高、铝金属位点丰富，因此具有出色的二氧化碳吸附能力.在本研究中，采用水热二次生长技术，在粗糙的大孔α-Al2O3载体管上，引入氧化铝和硝酸镍作为前驱体，其中，Al2O3用于控制无机支柱[AlF5(H2O)]2-的生长，Ni(NO3)2·6H2O用于提高金属前驱体镍源在溶剂中的溶解度，促进 Ni(Ⅱ)-吡嗪方格的形成，并与无机柱中心[AlF5(H2O)]2-反应，合成了多晶KAUST-8膜.并进一步探讨了反应物浓度、时间、温度等合成条件以及溶剂对KAUST-8膜性能的影响.优化后的 KAUST-8膜的H2渗透率为1.27×10-7 mol/(m2·s·Pa）（25 ℃、 0.1 MPa条件下），H2/CO2的理想选择性为19.3.

KAUST-8 nanosheets exhibit high surface area and pore volume, leading to exceptional CO2 adsorption due to Al metal sites. In this study, polycrystalline KAUST-8 membranes were developed using a hydrothermal secondary growth technique on coarse microporous α-Al2O3 tube supports, employing aluminum oxide and nickel nitrate precursors. Al2O3 was to control the growth of inorganic pillar [AlF5(H2O)]2- and Ni(NO3)2·6H2O for its enhanced solubility of precursor nickel sources, to form Ni(Ⅱ)-pyrazine square grids which reacted with the pillar to grow KAUST-8 crystals. Additionally, water was used as a solvent to promote membrane growth. Moreover, the synthesis conditions of reactant concentration, time, temperature, and effects of solvents were explored. The resulting optimized KAUST-8 membrane demonstrated H2 permeance rate of 1.27×10-7 mol/(m2·s·Pa） (at 25 ℃ and 0.1 MPa) and ideal selectivity of H2/CO2 of 19.3.

基金项目：

国家自然科学基金项目（21776031, 22378044)

作者简介：

Asad Sharif（1995-），男，巴基斯坦人，硕士生，从事MOF膜的制备与应用.*通讯作者，E-mail：ljinming@dlut.edu.cn

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