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Preparation of protonic-electronic mixed conducting PBI-based composite membrane with high-temperature tolerance and its hydrogen permeation

Authors： Bo Gao, Yiyi Fan, Xiuxia Meng, Yun Jin, Bo Meng，Naitao Yang

Units： School of Chemical Engineering, Shandong University of Technology,

KeyWords： membrane separation; PBI; protonic-electronic mixed conducting; H2 permeation; high-temperature tolerance.

ClassificationCode：TQ028.2+1

year,volume(issue):pagination： 2020,40(6):7-13

Abstract：

Membrane separation is a green energy-saving technology for gas separation and purification. Based on 3,3′-diaminobenzidine (DABz) and isophthalic acid (IPA) as raw materials, poly [2, 2 '-(m-phenyl) -5,5'-bibenzimidazole] (mPBI) with low molecular weight is synthesized by the “melt polymerization method”. The mPBI-TGIC/graphite/H3PO4 cross-linked composite membrane is obtained using triglycidyl isocyanurate (TGIC) as cross-linking agent and flake graphite as electronic conductor combining with impregnated phosphoric acid. The structural and performance characterization of the cross-linked composite membrane show that the cross-linked composite membrane has good mechanical properties and anti-oxidation stability. For separation of H2/CO2 mixed gas, the hydrogen selectivity is up to 100%, and the permeation flux is 0.14 mL min-1 cm-2 at 300 °C. The 160 h long-term stability at 280 °C indicates that mPBI-TGIC/graphite/H3PO4 cross-linked composite membrane has good high temperature resistance and applicable for high-temperature hydrogen separation.

Funds：

国家自然科学基金(21776165, 21878179, 21978157)和山东省自然科学基金(ZR2019MB056).

AuthorIntro：

作者简介：高波（1992-06 ），男，山东枣庄，硕士，研究方向为膜分离与技术，E-mail：1456757351@qq.com

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