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Poly-/metal-benzimidazole nano-composite membranes for hydrogen purification

机译：用于氢纯化的聚/金属苯并咪唑纳米复合膜

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摘要

In this study, a novel scheme to fabricate nano-composite membrane materials containing fully dispersed nano-size zeolitic imidazolate frameworks (ZIFs) has been proposed for the first time. By mixing the as-synthesized ZIF-7 nano-particles without the traditional drying process with polybenzimidazole (PBI), the resultant membranes not only achieve an unprecedented ZIF-7 loading as high as 50 wt%, but also overcome the low permeability nature of PBI. The membranes exhibit characteristics of high transparency and mechanical flexibility, together with enhanced H_2 permeability and ideal H_2/CO_2 permselectivity surpassing both neat PBI and ZIF-7 membranes. Advanced instrument analyses have confirmed the unique ZIF-polymer interface and elucidated the mixed matrix structure that contributes to the high ZIF loading and enhanced gas separation performance superior to the prediction from the Maxwell model. The high thermal stability, good dispersion of ZIF nanoparticles with minimal agglomeration and the attractive gas separation performance at elevated temperatures up to 180 ℃ indicate the practicability of this nano-composite material for hydrogen production and CO_2 capture in realistic industrial applications under harsh and extreme environments.
机译：在这项研究中，首次提出了一种新颖的方案来制备包含完全分散的纳米级沸石咪唑酸盐骨架（ZIFs）的纳米复合膜材料。通过在不采用传统干燥工艺的情况下将合成后的ZIF-7纳米颗粒与聚苯并咪唑（PBI）混合，所得膜不仅实现了前所未有的高达50 wt％的ZIF-7负载，而且还克服了ZIF-7的低渗透性PBI。该膜表现出高透明性和机械柔韧性，并具有超越纯PBI和ZIF-7膜的更高的H_2渗透性和理想的H_2 / CO_2渗透选择性。先进的仪器分析已经证实了独特的ZIF-聚合物界面，并阐明了混合基质结构，该结构有助于实现更高的ZIF装载量和增强的气体分离性能，优于Maxwell模型的预测。 ZIF纳米粒子的高热稳定性，良好的分散性和最小的团聚性以及在高达180℃的高温下具有吸引人的气体分离性能，表明该纳米复合材料可用于苛刻和极端环境下的实际工业应用中的制氢和CO_2捕集。

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  • 来源
    《Energy & environmental science》 |2011年第10期|p.4171-4180|共10页
  • 作者

    Tingxu Yang; Youchang Xiao; Tai-Shung Chung;

  • 作者单位

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 119260 Singapore, Singapore,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456 Singapore, Singapore;

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 119260 Singapore, Singapore;

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 119260 Singapore, Singapore;

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