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Fluorine cluster-based metal organic framework MFOFs material with high stability, and application thereof
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A high stability, organic framework technology, applied in other chemical processes, gas treatment, membrane technology, etc., can solve the problems of OMS not resistant to acid and alkali conditions, limited time length, difficult to use normally, etc.
Pending Publication Date: 2021-09-10
FUJIAN UNIV OF TECH
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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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Embodiment 1
[0043] Fluorine cluster-based MFOFs materials [Co 4 (μ 3 -F) 3 (μ 3 -SO 4 )(btb)(tpt) 2 ] The preparation method of (MFOF-1) crystal comprises the steps:
[0044] Weigh CoSO 4 ·6H 2 O (0.028g, 0.10mmol), 2,4,6-tris(4-pyridyl)-1,3,5-triazine (tpt) (0.016g, 0.050mmol), 1,3,5-tris( 4-carboxyphenyl)benzene (btb) (0.022g, 0.050mmol) was put into a 20mL glass bottle, and N,N dimethylacetamide (5mL) / methanol (5mL) / 1,4- Dioxane (1mL) solvent, sonicated for 30min, then added 100mL HBF 4 (tetrafluoroboric acid, 40wt% aqueous solution) for acidification; finally the mixed suspension was sealed and kept in a circulating oven at 100°C for 2 days, then collected, washed, and vacuum-dried to obtain the target product red octahedral crystal MFOF- 1.
[0045] The crystal MFOF-1 was soaked in acetonesolvent, and the solvent was exchanged every 12 hours. After six exchanges, it was activated under vacuum at 120°C for 8 hours to obtain MFOF-1 crystals that could be used for adsorption ...
Embodiment 2
[0047] Fluorine cluster-based MFOFs materials [Ni 4 (μ 3 -F) 3 (μ 3 -SO 4 )(btb)(tpt) 2 ] The preparation method of (MFOF-2) crystal comprises the steps:
[0048] Weigh NiSO 4 ·7H 2 O (0.056g, 0.20mmol), 2,4,6-tris(4-pyridyl)-1,3,5-triazine (tpt) (0.031g, 0.10mmol), 1,3,5-tris( 4-carboxyphenyl)benzene (btb) (0.044g, 0.10mmol) was put into a 20mL glass bottle, and N,N dimethylformamide (5mL) / methanol (5mL) / 1,4- Dioxane (1 mL) solvent, sonicated for 30 min, then added 300 μL H 2 SiF 6 (fluorosilicic acid, 35wt% aqueous solution) for acidification; finally the mixed suspension was sealed and kept in a 120°C circulation oven for 7 days, then collected, washed, and vacuum-dried to obtain the target product green octahedral crystal MFOF- 2.
[0049] The crystal MFOF-2 was soaked in methanol solvent, and the solvent was exchanged every 12 hours. After six exchanges, it was activated under vacuum at 100°C for 15 hours to obtain the MFOF-2 crystal for adsorption test.
[00...
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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 dioxidemixed 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 dioxideselective 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....
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