Metal-organic frameworks (MOFs) are of interest for CO2 sequestration and storage due to their porosity and the large number of structures that are possible. CO2 interacts strongly with primary and secondary alkyl amines, both in solution and in the solid state. This has led to the prediction that polyamine-based MOFs will have high CO2 capacity.
Roger Guilard and colleagues, Université de Bourgogne, France, have integrated an aza ligand into the framework of a MOF adsorbent. The new MOF uses an N-functionalized triazamacrocycle as a spacer ligand and is the first time that a rigid framework has been made from a flexible amine building block. The resulting MOF was shown to have a high surface area, a high adsorption capacity of CO2 of up to 88 cm3g–1 at 1 atm, and high selectivity for CO2 over CO, CH4, N2 and O2, making it a competitive material for CO2 capture applications.
- Selective CO2 Adsorption by a Triazacyclononane-Bridged Microporous Metal–Organic Framework
G. Ortiz, S. Brandès, Y. Rousselin, R. Guilard,
Chem. Eur. J. 2011.