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Insights into CO2 diffusion and sorption in NO2-MIL-53(Al) through PFG NMR and sorption techniques

AuthorsDíaz, Kenya; Sánchez Sánchez, Manuel ; López-González, Mar; Silvestre-Albero, Joaquín; Garrido, Leoncio
Issue Date16-Jun-2013
Citation5th Czech-Italian-Spanish conference on Molecular Sieves and Catalysis (2013)
AbstractMetal-organic frameworks (MOFs) are a family of porous materials of great interest in potential industrial applications like gas storage or separation [1]. In this context, thermodynamic and physical parameters such as gas sorption or diffusivity are keys to understand, predict and/or improve the performance of MOFs in these processes. However, whereas gas adsorption capacity values are highly documented in the literature, diffusion parameters have been scarcely studied. Amongst the experimental techniques to estimate gas diffusion coefficients, pulsed field gradient (PFG) NMR spectroscopy is able to measure diffusion coefficients of fluids in bulk and confined geometries [2], and it has been already successfully applied in MOFs [3]. This nondestructive method of measuring molecular mobility at the mesoscopic level is attractive as it allows determining diffusion coefficients from averaging the square root of the mean-square end-to-end distance of the diffusion trajectories. X-MIL-53(M) (X=functional group; M=trivalent metal) are MOFs exhibiting structural breathing effect or pore opening effect as a function of their affinity for the adsorbed gas and/or its pressure, what makes these materials ideal for gas separations. The breathing effect is controllable by changing the nature of X and/or M. Thus, NO2-MIL-53(Al), unlike its homologues X-MIL-53(Al), possesses an expanded pore structure or large pore (lp) form at room temperature. In this work, we describe the preparation of a nanocrystalline NO2-MIL-53(Al) material by a new method [4] at room temperature. Its high textural properties lead us to study its behavior as adsorbent of CO2, currently the most demanded gas in separation processes. The combination of CO2 gas adsorption measurements in conventional manometric equipments and PFG NMR analysis using 13CO2 at relatively high pressure provided important features of the CO2 adsorption phenomenon within NO2-MIL-53(Al).
DescriptionTrabajo presentado en la 5th Czech-Italian-Spanish conference on Molecular Sieves and Catalysis, celebrada en Segovia (España) del 16 al 19 de junio de 2013.
Appears in Collections:(ICTP) Comunicaciones congresos
(ICP) Comunicaciones congresos
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