2 research outputs found
Rapid, Microwave-Assisted Synthesis of Cubic, Three-Dimensional, Highly Porous MOF-205 for Room Temperature CO<sub>2</sub> Fixation via Cyclic Carbonate Synthesis
A dual-porous, three-dimensional,
metal–organic framework [Zn<sub>4</sub>OÂ(2,6-NDC)Â(BTB)<sub>4/3</sub>] (MOF-205, BET = 4200 m<sup>2</sup>/g) has been synthesized
using microwave power as an alternative energy source for the first
time, and its catalytic activity has been exploited for CO<sub>2</sub>–epoxide coupling reactions to produce five-membered cyclic
carbonates under solvent-free conditions. Microwave synthesis was
performed at different time intervals to reveal the formation of the
crystals. Significant conversion of various epoxides was obtained
at room temperature, with excellent selectivity toward the desired
five-membered cyclic carbonates. The importance of the dual porosity
and the synergistic effect of quaternary ammonium salts on efficiently
catalyzed CO<sub>2</sub> conversion were investigated using various
experimental and physicochemical characterization techniques, and
the results were compared with those of the solvothermally synthesized
MOF-205 sample. On the basis of literature and experimental inferences,
a rationalized mechanism mediated by the zinc center of MOF-205 for
the CO<sub>2</sub>–epoxide cycloaddition reaction has been
proposed
Monolithic metal–organic frameworks for carbon dioxide separationâ€
Carbon dioxide (CO2) is both a primary contributor to global warming and a major
industrial impurity. Traditional approaches to carbon capture involve corrosive and
energy-intensive processes such as liquid amine absorption. Although adsorptive
separation has long been a promising alternative to traditional processes, up to this
point there has been a lack of appropriate adsorbents capable of capturing CO2 whilst
maintaining low regeneration energies. In the context of CO2 capture, metal–organic
frameworks (MOFs) have gained much attention in the past two decades as potential
materials. Their tuneable nature allows for precise control over the pore size and
chemistry, which allows for the tailoring of their properties for the selective adsorption
of CO2. While many candidate materials exist, the amount of research into material
shaping for use in industrial processes has been limited. Traditional shaping strategies
such as pelletisation involve the use of binders and/or mechanical processes, which can
have a detrimental impact on the adsorption properties of the resulting materials or can
result in low-density structures with low volumetric adsorption capacities. Herein, we
demonstrate the use of a series of monolithic MOFs (monoUiO-66, monoUiO-66-NH2 &
monoHKUST-1) for use in gas separation processes