Scalable solvent-free preparation of [Ni 3 (HCOO) 6 ] frameworks for highly efficient separation of CH 4 from N 2

Highly efficient separation of methane from nitrogen on a squarate‐based metal‐organic framework

“…Given the observations of high affinity to CH 4 and satisfactory CH 4 capture capacity, we performed calculations using the well‐established IAST to establish its separation ability. Remarkably, the selectivity of CH 4 /N 2 in the equimolar of CH 4 and N 2 mixture reaches up to 12.5 at 298 K and 100 kPa, outperforming all the reported promising porous materials (Figure ), for instance, [M 3 (HCOO) 6 ] (M = Ni and Co, 6.8 and 5.1, respectively), Cu(Me‐4py‐trz‐ia) (4.2), MOF‐177 (4.0) and MOF‐5 (1.1), Cu‐MOF (6.9), UTSA‐30a (3.0), Cu‐BTC (3.7), MIL‐100(Cr) (3.0), M‐MOF‐74 (M = Mg (1.5), Co (3.2), and Ni (3.8)), ZIF‐68 (3.4) and ZIF‐69 (3.0) . The calculated IAST selectivities for different ratio of CH 4 and N 2 mixtures at 100 kPa were displayed in Figure a.…”

“…Metal‐organic frameworks (MOFs), as an emerging class of porous materials with enormous surface areas and adjustable pore sizes, are of great interest for gas separation, such as CO 2 /CH 4 , CO 2 /C 2 H 2 , and light hydrocarbons separation . In terms of MOFs for separation of CH 4 /N 2 , only a few MOFs have been able to fulfill this important separation during the decades . For example, adsorption equilibrium and kinetic of CH 4 and N 2 on MOF‐5 and MOF‐177 were determined to assess their gas separation feasibility by Deng group, and a significant CH 4 adsorption capacity of 22 wt % was displayed on MOF‐177 at ambient conditions.…”

“…Commercially available MOFs Basolite® A100 and ∞ [Cu(Me‐4py‐trz‐ia)] were reported by Möllmer et al, both of which showed the selective adsorption of CH 4 against N 2 with a predicted selectivity of 3.4–4.4 and 4.0–4.4 at 298 K, respectively. Furthermore, M 3 (HCOO) 6 (M = Co, Ni), a promising adsorbent for unconventional natural gas upgrading, was examined its separation ability through pressure swing adsorption and breakthrough experiments, which displayed a much higher selectivity of 6–7 for selective adsorption of CH 4 over N 2 . Indeed, it is still a critical challenge to design an ideal material with significant CH 4 capacity as well as superior adsorptive selectivity for their separation.…”

Rational Synthesis of Chabazite (CHA) Zeolites with Controlled Si/Al Ratio and Their CO2/CH4/N2 Adsorptive Separation Performances

“…However, the separation selectivities when dealingw ith most gas mixtures with carbonaceous materials are far from satisfactory in practical applications mainly owing to the lack of polarity and chaotic pore structures. [19] MOFs are one of the state-of-the-art crystalline materials, which feature ultra-high porosity,s ynthetic tailorability,a nd ease of synthesis, [20] nevertheless, the less chemicals tabilities and high manufacture costs restrict their potentialapplications. Zeolites are awell-known class of microporousm aterials with large surfacea reas and well-defined pore structures.…”

Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation

“…This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.Nanomaterials 2020, 10, 174 2 of 17 gas, which is not only a waste of energy sources but also pollutes the environment [9]. Therefore, it is urgent to concentrate on CH 4 in CBM for effective utilization [10]. Apart from CH 4 , CBM also contains certain CO 2 and N 2 , which would significantly cause pipeline and equipment corrosion and reduce the heating value of the CBM [8,11].…”