Exceptionally Stable Microporous Organic Frameworks with Rigid Building Units for Efficient Small Gas Adsorption and Separation

Abstract

Three microporous organic frameworks (hereafter denoted as MPOF-Ads) based on a rigid adamantane core have been successfully synthesized via Sonogashira–Hagihara polycondensation coupling in high yields, 83.7–94.6%. The obtained amorphous MPOF-Ads networks have high Brunauer–Emmett–Teller surface areas (up to 737.3 m2 g–1), narrow pore size distribution (0.95–1.06 nm), and superior thermal (the initial decomposition temperature T 5% under an N2 atmosphere can reach 410 °C) and chemical stability (no apparent degradation in common organic solvents or strong acid/base solutions after 7 days). At 273 K and 1.0 bar, these MPOF-Ads networks present good uptake capacities for small gas molecules (13.9 wt % CO2 and 1.66 wt % CH4) for which the presence of high surface area, predominant microporosity, and narrow pore size distribution are beneficial. In addition, the as-prepared MPOF-Ads networks possess moderate isosteric heats for CO2 (Q st = 19.5–30.3 kJ mol–1) and show desired CO2/N2 and CO2/CH4 selectivity (36.3–38.4 and 4.1–4.3 based on Henry’s law and 17.88–24.92 and 4.24–5.70 based on ideal adsorbed solution theory, respectively). With the demonstrated properties, the synthesized MPOF-Ads networks display potential for small gas storage and separation that can be used in harsh environments because of their superior physical and chemical stability.

Micro- and Ultramicroporous Polyaminals for Highly Efficient Adsorption/Separation of C1–C3 Hydrocarbons and CO2 in Natural Gas

“…Compared to the cryogenic fractional distillation process, the separation of light hydrocarbons by pressure swing physical adsorption using microporous polymers exhibits significant advantages in terms of the convenience and energy-saving as it can be operated at ambient temperature under atmospheric pressure, and the adsorbed C 1 –C 3 hydrocarbons are easily recovered by simply reducing the pressure, and the porous adsorbent can be reused. Over the past decade, numerous microporous polymers have been synthesized and their CO 2 -capture properties have been extensively studied. − However, less attention has been paid to the separation of organic hydrocarbons by microporous polymers. Particularly, the adsorption separations between C 2 and C 3 hydrocarbons and between C 2 –C 3 hydrocarbons and CO 2 in microporous polymers are still unexplored.…”

Conjugated Porous Polymers: Ground‐Breaking Materials for Solar Energy Conversion

“…The use of porous materials has attracted researchers of many areas of chemistry and materials in the last years due to their interesting intrinsic properties. They exhibit the potential to be used in a broad different applications such as gas adsorption, [14] pollutants removal, [15] photocatalysis, [16,17] optoelectronic devices, [18] and energy storage. [19] Attending to their inorganic or organic composition they can be mainly divided into three principal categories: zeolites, metal-organic frameworks (MOFs), and porous organic polymers (POPs) as shown in Figure 1.…”

Efficient Gas and VOC Separation and Pesticide Detection in a Highly Stable Interpenetrated Indium–Organic Framework

“…Separation or purification has been playing an important role in the process of obtaining clean energy and high-purity chemicals in the petrochemical industry. − For example, purification of CH 4 is an important separation process. As is known to all, CH 4 is not only a clean fuel with high utilization value but is also a feedstock for the production of various chemicals. − As the main component of natural gas and landfill gas, the impurities mixed with it are mainly CO 2 and C 2 hydrocarbons, and it is of vital importance to remove these impurities to achieve usable standards and provide a source of C 2 hydrocarbons for further use. , In addition, the separation of volatile organic compounds (VOCs) as some important ingredients has also attracted much attention . The traditional separation or purification technology usually produces a large amount of organic solvent waste liquid by means of organic solvent extraction, distillation, or other methods, requiring a large amount of equipment investment and energy consumption.…”