Micero Alessandro, Hashem Tawheed, Gliemann Hartmut, Léon Aline
European Institute for Energy Research (EIFER), Emmy-Noether-Strasse 11, 76131 Karlsruhe, Germany.
Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Membranes (Basel). 2021 Sep 27;11(10):735. doi: 10.3390/membranes11100735.
The quality assurance of hydrogen fuel for mobile applications is assessed by the guidelines and directives given in the European and international standards. However, the presence of impurities in the hydrogen fuel, in particular nitrogen, water, and oxygen, is experienced in several refueling stations. Within this work, metal-organic framework (MOF)-based membranes are investigated as a fine-purification stage of the hydrogen fuel. Three H/N concentrations have been used to analyze the separation factor of UiO-66-NH membranes prepared using the layer-by-layer (LBL) and the one-pot (OP) synthesis methods. It is shown that the separation factor for an equimolar ratio is 14.4% higher for the LBL sample compared to the OP membrane, suggesting a higher orientation and continuity of the LBL surface-supported metal-organic framework (SURMOF). Using an equimolar ratio of H/N, it is shown that selective separation of hydrogen over nitrogen occurs with a separation factor of 3.02 and 2.64 for the SURMOF and MOF membrane, respectively. To the best of our knowledge, this is the highest reported performance for a single-phase UiO-66-NH membrane. For higher hydrogen concentrations, the separation factor decreases due to reduced interactions between pore walls and N molecules.
用于移动应用的氢燃料的质量保证是根据欧洲和国际标准给出的指南和指令进行评估的。然而，在几个加氢站都发现了氢燃料中存在杂质，特别是氮气、水和氧气。在这项工作中，研究了基于金属有机框架（MOF）的膜作为氢燃料的精细纯化阶段。使用了三种H/N浓度来分析采用层层（LBL）和一锅法（OP）合成方法制备的UiO-66-NH膜的分离因子。结果表明，与OP膜相比，LBL样品在等摩尔比下的分离因子高14.4%，这表明LBL表面负载金属有机框架（SURMOF）具有更高的取向性和连续性。在H/N等摩尔比下，SURMOF膜和MOF膜对氢气与氮气的选择性分离因子分别为3.02和2.64。据我们所知，这是单相UiO-66-NH膜报道的最高性能。对于更高的氢气浓度，由于孔壁与N分子之间的相互作用减弱，分离因子会降低。
