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Title: Poly-/metal-benzimidazole nano-composite membranes for hydrogen purification
Authors: Yang, T.
Xiao, Y. 
Chung, T.-S. 
Issue Date: Oct-2011
Citation: Yang, T., Xiao, Y., Chung, T.-S. (2011-10). Poly-/metal-benzimidazole nano-composite membranes for hydrogen purification. Energy and Environmental Science 4 (10) : 4171-4180. ScholarBank@NUS Repository.
Abstract: 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 °C indicate the practicability of this nano-composite material for hydrogen production and CO 2 capture in realistic industrial applications under harsh and extreme environments. © 2011 The Royal Society of Chemistry.
Source Title: Energy and Environmental Science
ISSN: 17545692
DOI: 10.1039/c1ee01324f
Appears in Collections:Staff Publications

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