Gas‐Sorption Selectivity of CUK‐1: A Porous Coordination Solid Made of Cobalt(II) and Pyridine‐2,4‐ Dicarboxylic Acid

Abstract

As a size‐selective molecular sieve, the coordination polymer formed from cobalt and pyridine‐2,4‐dicarboxylic acid (CUK‐1, see figure) shows unprecedented selectivity for O2 and preferential selectivity for CO2 over CH4. The present sorption results encourage the development of new adsorbent materials that may find use in the production of high‐purity gas products. This work demonstrates that CUK‐1 can be utilized, for the first time, in the separation of light gases via gas chromatography.

Can Metal–Organic Framework Materials Play a Useful Role in Large‐Scale Carbon Dioxide Separations?

“…For both mixtures the material preferentially adsorbed CO 2 . Yoon et al [63] explored separation of light gases over a column packed with CUK-1, showing that CO 2 had the longest retention time among the gases in a mixture of H 2 , O 2 , N 2 , CH 4 , and CO 2 . None of the conclusions from the breakthrough experiments we have just mentioned are surprising; essentially all nanoporous materials show preferential adsorption of CO 2 relative to other light gases.…”

Porous aromatic frameworks with anion-templated pore apertures serving as polymeric sieves

“…Among the four samples, the sorption amount of the same gas declines sharply, which could be attributed to the fact that the saturation adsorption on the pore walls was easily reached along with the reduction of surface area. All these phenomena suggest that each PAF material may behave as a molecular sieve for the specific gas molecule according to their different interactions to the pore surfaces as well as their size-selective effect 49 .…”

Ultra-high adsorption capacity of zeolitic imidazole framework-67 (ZIF-67) for removal of malachite green from water

“…Owing to MOFs' tunable crystalline network structure, MOFs have been extensively used as adsorbents via the guest-to-host mechanism. Up to date, MOFs have been proven as one of the most promising adsorbents to store hydrogen and to capture CO 2 (Yoon et al, 2007). MOFs are also applied in other adsorption-related fields, including drug delivery (Horcajada et al, 2010), catalysis (Lee et al, 2009), and separations (Haque et al, 2010(Haque et al, , 2011(Haque et al, , 2014Khan et al, 2013;Van de Voorde et al, 2014).…”