A π-electron deficient diaminotriazine functionalized MOF for selective sorption of benzene over cyclohexane

Abstract

A diaminotriazine functionalized novel MOF (DAT-MOF-1) has been synthesized stemming out of a π-electron-deficient pore-surface functionalization based linker-design principle, which results in efficient selectivity of benzene sorption over its aliphatic analogue cyclohexane, crucial from the industrial standpoint.

Bimodal Functionality in a Porous Covalent Triazine Framework by Rational Integration of an Electron‐Rich and ‐Deficient Pore Surface

“…In view of the significantly higher uptake capacityo fb enzene in CTF-IP10, we should expect that the separation performance of benzene/cyclohexane mixtures with CTF-IP10 would be significantly higher than that of DAT-MOF-1, the separations of which were reported in our earlier work. [11] Breakthrough simulations, carriedo ut with the method describedi no ur earlier work, [12] show that clear separations of equimolar benzene/cyclohexanem ixtures are achievable with CTF-IP10;s ee Figure 5d.Avideo animation( see the Supporting Information) demonstrates the superior selective adsorption ability of CTF-IP10 for benzene over cyclohexane.…”

Enhancing Multicomponent Metal–Organic Frameworks for Low Pressure Liquid Organic Hydrogen Carrier Separations

“…The separation of cyclohexane and benzene is a particularly important, energy intensive and expensive process due to their similar boiling points and kinetic diameters, 5.85 Å and 6.0 Å for benzene and cyclohexane, respectively (Figure S24) . The comparable boiling points excludes fractional distillation as an efficient separation process for these two chemicals, however adsorptive separation is an attractive alternative . Some MOFs have been investigated with this particular separation application goal, all providing MOFs selective for benzene adsorption in favour of cyclohexane .…”

“…The comparable boiling points excludes fractional distillation as an efficient separation process for these two chemicals, however adsorptive separation is an attractive alternative . Some MOFs have been investigated with this particular separation application goal, all providing MOFs selective for benzene adsorption in favour of cyclohexane . To the best of our knowledge, CUB‐30 is the first MOF material to show selective adsorption of cyclohexane over benzene, and as such broadens the scope for MOFs to be used in the removal of low concentrations of cyclohexane from mixed benzene/cyclohexane systems.…”

“…An alternative separation strategy is to exploit the differences of cyclic aliphatic and aromatic molecules when upon physisorption in porous adsorbents . Metal‐organic frameworks (MOFs) are emerging porous materials that have recently been investigated as solid adsorbents for the separations of benzene and cyclohexane . These MOFs encourage selectivity through exploitation of the spatial configurational orientations of the two molecules, that is, the planar π‐cloud of benzene and the non‐planar configurations of cyclohexane .…”

“…These MOFs encourage selectivity through exploitation of the spatial configurational orientations of the two molecules, that is, the planar π‐cloud of benzene and the non‐planar configurations of cyclohexane . MOFs investigated thus far have shown preference for benzene adsorption over cyclohexane adsorption due to the extensive π–π or Lewis acid–base interactions between the adsorbate and the framework …”