Postsynthetic Metalation of a New Metal–Organic Framework To Improve Methane Working Storage Capacity
Ha L. Nguyen, Roc Matheu, Christian S. Diercks, Tân Lê Hoàng Đoàn, Binh T. Nguyen, Kyle E. Cordova
Abstract
In the design of metal–organic frameworks (MOFs) for methane storage, a balance must be struck between the porosity of the MOF, the internal pore environment, the adsorption thermodynamics, and the density. Herein, we report the design of a new Zr-MOF, termed MOF-700, which was metalated with various Cu(II) salts to produce an isoreticular series of three new, highly porous MOFs (MOF-701, MOF-702, and MOF-703). The position of the metalated sites was determined by X-ray absorption spectroscopy, and the metalated frameworks were found to display high volumetric methane storage working capacities [206 cm3(STP) cm–3 at 298 K and 5.0–80.0 bar for MOF-701]. This constitutes an improvement of 50% over the performance of the parent MOF-700 [137 cm3(STP) cm–3] and highlights the prospect of optimization of methane working storage capacity by postsynthetic metalation.