Influence of intermediate layers in tubular carbon membrane for gas separation performance

• Published in: International journal of hydrogen energy 2019-08, Vol.44 (37), p.20914-20923
• Main Authors: Sazali, N., Salleh, W.N.W., Ismail, A.F., Ismail, N.H., Yusof, N., Aziz, F., Jaafar, J., Kadirgama, K.
• Format: Article
• Language: English
• Subjects: Dip-coating; Hydrogen separation; Intermediate layer; Nanocrystalline cellulose (NCC); P84 co-polyimide
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2018.06.148

The main objective of this study is to determine the best intermediate layer for tubular carbon membranes for H2 and He separation. Intermediate layer was applied to strengthen interfacial adhesion between selective carbon layers and tubular support. Three different intermediate layers (alumina powder, carbon molecular sieve (CMS), and carbon pencil) had been evaluated to compare their influence towards the performance of gas separation of the carbon membrane. Tubular carbon membrane was fabricated from PI/NCC-based polymer blends which had been carbonized under Argon atmosphere at 800 °C with a heating rate of 3 °C/min. Based on the scanning electron microscopic (SEM) observations, carbon membrane with alumina powder as an intermediate layer had formed a smoother surface compared to other types of intermediate layers. A high performance of tubular carbon membrane was obtained by employing alumina powder as an intermediate layer, which exhibited the best selectivity of H2/N2 and He/N2 of 447.31 ± 1.45 and 471.72 ± 2.19, respectively. •Three different intermediate layers were used to obtain high separation performance.•High performance of tubular carbon membrane was obtained by employing alumina powder as an intermediate.•Carbonization under Argon atmosphere at 800 °C with a heating rate of 3 °C/min were conducted.•Highest selectivity of H2/N2 and He/N2 of 447.31 ± 1.45 and 471.72 ± 2.19 was achieved.