Thesis defence M. Shan: CO2 separation

24 October 2018 15:00 - Location: Aula, TU Delft - By: webredactie

Porous organic framework (POF) membranes for CO2 separation. Promotor 1: Prof.dr. J. Gascon Sabate (TNW); Promotor 2: Prof.dr. F. Kapteijn (TNW).

Membrane-based separation has become a promising alternative to traditional separation processes to capture CO2 owing to the great features such as energy efficiency and environmental friendliness. Porous organic frameworks (POFs) are an emerging class of microporous polymers, which may have high CO2 permeability and selectivity when being processed into membranes due to their intrinsic porosity and strong CO2 adsorption ability. However, using POFs as membranes are still at the infancy stage due to their insolubility in most common solvents. This thesis focusses on the development of porous organic frameworks (POFs) membranes for various CO2 separation applications, including biogas upgrading, post-combustion CO2 capture and pre-combustion capture. Part I gives an introduction on different types of POFs along with their structures and applications in gas separation either in the form of mixed-matrix membranes (MMMs) or pure POF membranes. Part II present the synthesis, characterization of an azine-linked covalent organic framework (ACOF-1) and ACOF-1 based MMMs for biogas upgrading and post-combustion CO2 capture. Part III focuses on the development of amorphous benzimidazole-linked polymer (BILP-101) membranes for pre- and post-combustion CO2 capture. The prepared BILP membrane display an unprecedented H2/CO2 selectivity (up to 40) at 423 K together with high-pressure resistance and long-term stability (>800 h in the presence of water vapor). 

Overall, the obtained results in this thesis demonstrate that POFs are promising candidates to be applied in membrane fields for CO2 separation. The fully organic nature makes POFs attractive and easy to be incorporated into polymers to prepare defect-free MMMs due to their excellent compatibility. Another alternative method, interfacial polymerization, offers an interesting outlook for the preparation of defect-free pure POF membranes. The combination of the above two preparation methods with the rich chemistry of POFs may open the door to the rational design of versatile POF membranes for a wide range of separations.

More information?

For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.