利用水热二次生长法制备用于H2/CO2分离的KAUST-8膜

Preparation of KAUST-8 membranes by hydrothermal secondary growth method for H2/CO2 separation

Asad Sharif ¹王泓博 ¹鲁金明 ¹杨建华 ¹刘毅¹

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作者信息

1. 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,大连 116024
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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.

Abstract

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.

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

Key words

CO2 separation/KAUST-8 membranes/fluorinated MOF membranes/hydrothermal synthe-sis/H2 purification

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基金项目

国家自然科学基金项目(21776031)

国家自然科学基金项目(22378044)

出版年

2024

膜科学与技术

中国蓝星（集团）股份有限公司

膜科学与技术

CSTPCDCSCD北大核心

影响因子：0.634

ISSN：1007-8924

参考文献量28

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