Co-based zeolitic imidazolate framework ZIF-9 membranes prepared on α-Al2O3 tubes through covalent modification for hydrogen separation
Co-based zeolitic imidazolate framework ZIF-9 membranes prepared on α-Al2O3 tubes through covalent modification for hydrogen separation
复制标题
通过共价修饰在α-Al2O3管上制备钴基咪唑骨架ZIF-9膜用于氢分离
DOI：
10.1016/j.ijhydene.2019.10.230
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发表时间：
2020
影响因子：
7.2
通讯作者：
Huang Aisheng
中科院分区：
文献类型：
--
作者：
Liu Jiaqin;Liu Chuanyao;Huang Aisheng
氢能被认为是最有前途的清洁可再生能源。除了氢气的生产，氢气的分离也是一个重要的问题，然后才能用于燃料电池。膜分离技术以其高效、低能耗的特点受到了广泛的关注。沸石咪唑骨架（ZIF）膜由于其类似沸石的性质如永久孔隙率、均匀孔径以及优异的热稳定性和化学稳定性而引起了人们的极大兴趣。在多孔α-Al 2 O3管上制备共生良好的钴基沸石咪唑骨架（ZIFs）膜具有相当大的挑战性，因为钴基ZIFs更喜欢在合成溶液中形成晶体而不是在载体表面以膜层形式生长。本文采用3-氨丙基三乙氧基硅烷（APTES）作为共价连接剂对α-Al 2 O3管进行修饰，制备了具有高H2/CO2选择性和优异热稳定性的ZIF-9膜。由于APTES与ZIF-9之间形成共价键，ZIF-9营养素结合在载体表面，从而促进致密且相纯的ZIF-9膜的生长，其厚度约为4.0 μm。通过对H2/CO2、H2/N2和H2/CH 4的单一气体渗透和混合气体分离，评价了ZIF-9膜的气体分离性能。ZIF-9膜对H_2/CO_2、H_2/CH_4和H_2/N_2的混合物分离因子分别为21.5、8.2和14.7，远远超过相应的Knudsen系数。此外，如此制备的ZIF-9膜在相对宽的操作温度范围内表现出优异的稳定性，这对于氢分离或进一步的膜反应器的工业应用是有益的。
Hydrogen has been regarded as the most promising clean and renewable energy. Beside the production of the hydrogen, the separation of hydrogen is also an import issue before it can be used in fuel cells. Membrane-based separation technologies have gained considerable attentions due to its high efficiency and low energy consumption. Zeolite imidazolate framework (ZIF) membranes have drawn intense interest due to their zeolite-like properties such as permanent porosity, uniform pore size and exceptional thermal and chemical stability. It is rather challenged to prepare well-intergrown Co-based zeolitic imidazolate frameworks (ZIFs) membranes on porous α-Al2O3tubes since Co-based ZIFs prefer to form crystals in the synthesis solution rather than grow as membrane layer on the support surface. In this work, we report the preparation of high-quality ZIF-9 membrane with high H2/CO2selectivity and excellent thermal stability by using 3-aminopropyltriethoxysilane (APTES) as a covalent linker to modify the α-Al2O3tube. Due to the formation of covalent bonds between APTES and ZIF-9, ZIF-9 nutrients are bound to the support surface, thus promoting the growth of dense and phase-pure ZIF-9 membrane with a thin thickness of about 4.0 μm. The gas separation performances of the ZIF-9 membrane were evaluated by single gas permeation and mixture gas separation of H2/CO2, H2/N2and H2/CH4, respectively. The mixture separation factors of H2/CO2, H2/CH4, and H2/N2of the ZIF-9 membrane are 21.5, 8.2 and 14.7, respectively, which by far exceeds corresponding Knudsen coefficients. Moreover, the as-prepared ZIF-9 membrane exhibits excellent stability at a relatively broad range of operating temperature, which is beneficial for the industrial application of hydrogen separation or further membrane reactor.
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影响因子：
7.2
作者：
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通讯作者：
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影响因子：
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