Mixed Matrix Membranes Containing UiO-66(Hf)-(OH)2 Metal–Organic Framework Nanoparticles for Efficient H2/CO2 Separation

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• 作者：Zhigang Hu ; Zixi Kang ; Yuhong Qian ; Yongwu Peng ; Xuerui Wang ; Chenglong Chi ; Dan Zhao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：55
• 期：29
• 页码：7933-7940
• 全文大小：548K
• 年卷期：0
• ISSN：1520-5045

文摘

Mixed matrix membranes (MMMs) have received significant attention recently in the applications of gas separation for clean energy and environmental sustainability. The compatibility between dispersed functional fillers and continuous polymer matrices of MMMs is the key issue to avoid the formation of nonselective defects for better gas separation performance. Because of their easily tunable porosity, functionality, and morphology, metal–organic frameworks (MOFs) have been regarded as ideal fillers for MMMs. In this work, we present a facile modulated hydrothermal synthesis of a hafnium UiO-66-type MOF UiO-66(Hf)-(OH)₂ with well-defined nanoparticle size that exhibits a good compatibility with polybenzimidazole (PBI) as the polymeric matrix in the resultant MMMs. Compared to pure PBI membranes, MMMs containing MOF nanoparticles have both increased H₂ permeability and H₂/CO₂ permselectivity under optimized conditions. One of the MMMs, 10%UiO-66(Hf)-(OH)₂@PBI, demonstrates excellent H₂ permeability (8.12 barrers) and H₂/CO₂ permselectivity (19.37) that put it above the 2008 Robeson upper bound. Mixed-gas permeation and durability tests are also carried out to evaluate the performance of these MMMs under working conditions.