An amorphous iron MOF (NEU-2 = Fe(BPDI)(Py)2, BPDI = N,N’bis(glycinyl)pyromellitic diimide; Py = pyridine) with multi-channel pore systems is synthesized, and subsequently tested as class 1 sorbent by evaluating its CO2 capture capacity. PEI-loaded NEU-2 (NEU-2-PEI) is prepared by incorporating large PEI molecules preferentially into the meso- and macroporous present in NEU-2. Thus, NEU-2-PEI enables open micropores to be accessible for CO2 diffusion to internal amine sites; in other words, NEU-2-PEI allows amine loading but access to amine sites. The changes in CO2 capture capacity at equilibrium and the amine efficiency of NEU-2-PEI were tested at increasing amine loadings. Moreover, tests at different temperatures and cyclic adsorption-desorption experiments were performed to examine CO2 uptake and amine efficiency evolution. In addition, the diffusion resistance present within the pores of the material is measured by comparing the fast uptake at the beginning of the capture (pseudo-kinetic regime) to the slow uptake at the end of capture towards equilibrium (pseudo-diffusive regime) upon amine loading, temperature raising and multiple cycles of sorption and desorption. This research demonstrates for the first time that the ordered crystalline state of MOFs is not a requirement for gas uptake, establishing novel amorphous MOFs with hierarchical porosity as promising materials for CO2 capture applications.

Iron amorphous metal organic framework as supported of amine for carbon dioxide capture

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.