Highly Efficient Synthesis of a Moisture-Stable Nitrogen-Abundant Metal–Organic Framework (MOF) for Large-Scale CO₂ Capture

Abstract

Metal−organic frameworks (MOFs) hold great potential as CO 2 adsorbents; however, the long reaction time that is required for the preparation of MOFs by a hydrothermal or solvothermal method is a hurdle for largescale production. In this work, we synthesize a moisture-stable nitrogen-abundant cobalt-based MOF, i.e., Co-PL-1, using microwave irradiation for the first time (denoted as MW-Co-PL-1). Compared to hydrothermal synthesis, which always requires 3 days at 180 °C, only 30 min at the same temperature is required for the microwave synthesis. The resulting MW-Co-PL-1 shows high CO 2 uptake, especially at low CO 2 partial pressure (89 mg g −1 at 298 K, 1 bar and 53 mg g −1 at 298 K, 0.15 bar), good capture selectivity against N 2 (19.8 at 1 bar and 44 at 0.15 bar), reversible CO 2 uptake during consecutive adsorption−desorption cycles, and very robust structure stability under moisture conditions. The highly efficient synthesis, together with great performance, makes the microwave synthesis of Co-PL-1 promising for large-scale CO 2 capture, which demonstrates a new way for large-scale application of MOFs in the near future.

Recent advances in process engineering and upcoming applications of metal–organic frameworks

“…However, there are still several challenges in adapting MOFs to different industries. First, only a few MOFs maintain their properties in aqueous acidic/basic conditions [14] , [15] , [16] , [17] , [18] . Second, syntheses for the mass production of many MOFs have not yet been established [19] , [20] , [21] , [22] .…”

Reversible Solid-State Isomerism of Azobenzene-Loaded Large-Pore Isoreticular Mg-CUK-1

“…Hydrothermal synthesis of functional metal–organic frameworks (MOFs) using water as the only reaction medium is beneficial from an environmental perspective and provides MOFs that are inherently moisture-stable . Their application as adsorbents for the capture of potable water in arid regions has been demonstrated by Yaghi and co-workers .…”

Advances in Microwave Synthesis of Nanoporous Materials

“…The growing issue of climate change caused by high emissions of greenhouse gases (e.g., CO 2 , CH 4 ) became a motive for synthesizing MOFs with high gas adsorption capabilities. Several archetype MOFs, known as promising sorbents, such as MIL‐101, [ 128 ] UiO‐67, [ 129 ] UiO‐66, [ 130,131 ] MOF‐74, [ 132,133 ] MIL‐53, [ 134 ] MOF‐177 [ 135 ] and others [ 136,137 ] can be successfully prepared by a microwave‐assisted method. For example, Wu et al.…”

“…Porous MOFs obtained via microwave‐assisted methods with their SSA values and potential applications are summarized in Table 5 . [ 126–172 ]…”