Impact of the Intermediate Layer Structure on the CO2/CH4 Separation Performance of Carbon Molecular Sieving Membranes

0573290 - ÚCHP 2024 eng A - Abstract
Setničková, Kateřina - Tseng, H.-H. - Tung, K.-L. - Uchytil, Petr
Impact of the Intermediate Layer Structure on the CO2/CH4 Separation Performance of Carbon Molecular Sieving Membranes.
[International Conference on Inorganic Membranes (ICIM 16), hybrid conference /16./. Taipei, 28.06.2022-30.06.2022]
Method of presentation: Prezentace
Event organizer: National Taiwan University in Taipei
R&D Projects: GA ČR(CZ) GC19-23760J
Institutional support: RVO:67985858
Keywords : gas separation * carbon membrane * molecular sieve * molecular simulation
OECD category: Chemical process engineering

This work is a study investigating the role of the intermediate layer in carbon molecular sieve (CMS) membrane formation and its impact on the gas separation performance. Herein, the effect of key preparation variables of CMS/TiO2 membrane prepared from the polyetherimide (PEI) precursor on membrane’s structure and CO2/CH4 separation quality was studied. A set of CMS/TiO2/Al2O3 membranes produced under different conditions (pH of the sol-gel for the intermediate TiO2 layer preparation, the TiO2 interlayer thickness and the carbon separation layer thickness) was prepared, characterized by the AFM, FE-SEM and EDXS methods and tested for CO2/CH4 separation efficiency [2]. In addition, a molecular simulation was applied to investigate the effect of intermediate TiO2 layer.
All prepared membranes had good separation quality (the separation factor between 37 and 65). The best results for membranes with the thickest TiO2 interlayer prepared at pH = 5 were identified. Notably, membrane samples with the thin defect free carbon separation layer achieved the best balance of permeance vs. selectivity and exceeded the Robeson upper bound. The molecular simulation results support the finding of the intermediate layer plays a vital role for the synthesis of gas separation membranes.

Permanent Link: https://hdl.handle.net/11104/0343751