Abstract
A porous, nitrogen-doped carbonaceous free-standing membrane (TFMT-550) is prepared by a facile template-free method using letrozole as an intermediate to a triazole-functionalized-triazine framework, followed by carbonization. Such adsorption/diffusion membranes exhibit good separation performance of CO 2 over N2 and surpassing the most recent Robeson upper bound. An exceptional ideal CO2/N2 permselectivity of 47.5 was achieved with a good CO2 permeability of 2.40 × 10 -13 mol m m-2 s-1 Pa-1. The latter results arise from the presence of micropores, narrow distribution of small mesopores and from the strong dipole-quadrupole interactions between the large quadrupole moment of CO2 molecules and the polar sites associated with N groups (e.g., triazine units) within the framework.
Original language | English |
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Pages (from-to) | 452-459 |
Number of pages | 8 |
Journal | Macromolecular Rapid Communications |
Volume | 34 |
Issue number | 5 |
DOIs | |
State | Published - Mar 12 2013 |
Keywords
- N-doped
- adsorption/diffusion
- carbonaceous membrane