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Acetylene is a very important chemical raw material and is widely used in the synthesis of polyester plastic materials. However, when the pressure exceeds two atmospheres, acetylene can explode even under anaerobic conditions at room temperature, so the storage and transportation of acetylene still faces enormous challenges. Porous metal-organic framework materials (MOFs) have high specific surface area, adjustable pore size, and have excellent performance in the adsorption and separation of conventional gases, so the MOFs material is expected to solve the adsorption of acetylene gas and Storage problems provide the means.
Under the support of the "973" Program of the Ministry of Science and Technology and the National Science Foundation of Fujian Province, the Hongmao Group and the structural team of Yuan Daqiang, the State Key Laboratory of Structural Chemistry of the Institute of Physical Structure Research, the Chinese Academy of Sciences, have independently designed and synthesized dendritic polycarboxylic acids. The body, and the use of metal copper ions as a node, self-assembly to obtain a stable porous MOFs compound FJI-H8.
The fully-activated FJI-H8 material has a specific surface area of ​​2025±15 m2 g-1, and the pore size distribution is concentrated in a narrow range of about 1.2 nm. Due to the well-sized pores and abundant open metal sites, FJI-H8 is at room temperature. Under normal pressure conditions, acetylene shows good adsorption performance. At 295 K and atmospheric pressure, the adsorption of acetylene gas by FJI-H8 is as high as 224 cm3g-1, which is much larger than the maximum value reported in the previous literature (HKUST-1, 201cm3). G-1).
Even when the experimental temperature is increased to 308K, the acetylene adsorption capacity can still reach 200 cm3g-1. In addition, after five cycles of desorption and desorption cycling without reactivation, the adsorption of acetylene by FJI-H8 only decreased by 3.8%, indicating that the material has good recyclability. Theoretical calculations show that in the ultra-high acetylene adsorption performance of FJI-H8, not only the open metal sites, but also the proper size and geometry of the channel play a crucial role. The results provide new ideas and approaches for the study of porous materials with excellent acetylene adsorption properties.
The above research work was published in Nature Communications (Nat. Commun., 2015, 6, 7575, DOI: 10.1038/ncomms8575).
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