Fluorine cluster-based metal organic framework MFOFs material with high stability, and application thereof

Abstract

The invention discloses a fluorine-cluster-based metal organic framework MFOFs material with high stability, and application thereof. The structural general formula of the metal organic framework material is [M4([mu]3-F)3([mu]3-SO4)(L1)(L2)2], wherein M in the formula is zinc, iron, cobalt, nickel, manganese and cadmium, L1 is 1, 3, 5-tris(4-carboxyphenyl)benzene (btb), or 2, 4, 6-tris(4-carboxyphenyl)-1, 3, 5-triazine (tatb), and L2 is 2, 4, 6-tris(4-pyridyl)-1, 3, 5-triazine (tpt), 2, 4, 6-tris (4-pyridyl)pyridine (pytpy) or 1, 3, 5-tris(4-pyridyl)benzene (tpb). The activated MFOFs material can be used as an adsorbent to realize separation of acetylene / carbon dioxide mixed gas; and the prepared material has high acetylene adsorption capacity and high selectivity, the acetylene / carbon dioxide penetration duration of [Co4([mu]3-F)3([mu]3-SO4)(btb)(tpt)2] at normal temperature and normal pressure reaches up to 52 min / g, the duration after multiple penetration experiments is still kept unchanged, efficient acetylene / carbon dioxide selective adsorption performance is reflected, and effective separation of acetylene / carbon dioxide can be achieved.

Description

technical field [0001] The invention belongs to the technical field of acetylene separation and purification, and in particular relates to a highly stable fluorine cluster-based metal organic framework MFOFs material and its application. Background technique [0002] Acetylene (C 2 h 2 ) is not only widely used as a gaseous fuel for lighting and metal processing, but also an important raw material for the manufacture of plastics, rubber, fibers, and platform chemicals such as acetaldehyde, acetic acid, and benzene. Although acetylene plays an important role in daily life and chemical industry, in order to promote its wider practical application, it is urgent to solve the problem of separation, purification and storage of acetylene. The industrial production of acetylene comes from the pyrolysis of natural gas, in which the by-product carbon dioxide is unavoidable. Therefore, in order to obtain high-purity acetylene, carbon dioxide and uncracked methane need to be removed....

AI Technical Summary

Problems solved by technology

Many MOFs have been developed and tested for their separation performance for acetylene / carbon dioxide mixtures, such as UTSA-74 (J.Am.Chem.Soc., 2016, 138, 5678-5684.), using open metal centers (OMS) as binding Although MOFs materials with high acetylene adsorption capacity and selectivity have high acetylene adsorption capacity and selectivity, in practical applications, acetylene vapor contains a small amount of water vapor and acidic corrosive gases, while a large amount of OMS is not resistant to acid and alkali conditions, resulting in its structure The stability is poor, and the length of time in the penetration test is limited, so it is difficult to use normally under industrial conditions

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