Abstract
Acetylene, an important petrochemical raw material, is very difficult to store safely under compression because of its highly explosive nature. Here we present a porous metal-organic framework named FJI-H8, with both suitable pore space and rich open metal sites, for efficient storage of acetylene under ambient conditions. Compared with existing reports, FJI-H8 shows a record-high gravimetric acetylene uptake of 224 cm3 (STP) g−1 and the second-highest volumetric uptake of 196 cm3 (STP) cm−3 at 295 K and 1 atm. Increasing the storage temperature to 308 K has only a small effect on its acetylene storage capacity (∼200 cm3 (STP) g−1). Furthermore, FJI-H8 exhibits an excellent repeatability with only 3.8% loss of its acetylene storage capacity after five cycles of adsorption–desorption tests. Grand canonical Monte Carlo simulation reveals that not only open metal sites but also the suitable pore space and geometry play key roles in its remarkable acetylene uptake.
Highlights
Acetylene, an important petrochemical raw material, is very difficult to store safely under compression because of its highly explosive nature
To our knowledge, the open metal sites within metal-organic frameworks (MOFs) materials usually play an important role in the high gas storage capacities due to the strong interactions between acetylene molecules and the metal sites
In FJI-H8, the open Cu(II) site density is low and the acetylene uptake by the pore space accounts for 460% of the whole amount, which is rarely seen in other reported MOFs
Summary
An important petrochemical raw material, is very difficult to store safely under compression because of its highly explosive nature. We present a porous metal-organic framework named FJI-H8, with both suitable pore space and rich open metal sites, for efficient storage of acetylene under ambient conditions. FJI-H8 exhibits an excellent repeatability with only 3.8% loss of its acetylene storage capacity after five cycles of adsorption–desorption tests. To effectively improve acetylene storage capacity at room temperature, Chen et al explored a series of microporous MOFs with different structures and porosities and concluded that open Cu(II) sites and suitable pore space in MOFs played crucial roles for acetylene storage[18,19,20,21,22]. Reaction of H8tddb and Cu(NO3)[2] under solvothermal conditions resulted in a porous MOF ([Cu4(tddb) Á (H2O)4]n Á (solvent)x, abbreviated as FJI-H8) with both suitable pore space and open metal sites. The acetylene adsorption amount of FJI-H8 at 295 K has no obvious loss after five cycles of adsorption–desorption test
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