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Preparation method and catalysis applications of efficient and simple zeolite imidazole framework ZIF-8 crystals with different morphologies

A technology of zeolite imidazole skeleton and ZIF-8, which is applied in the direction of catalytic reaction, preparation of organic compounds, preparation of carboxylic acid nitrile, etc., to achieve the effect of high product yield, uniform appearance and low cost

Inactive Publication Date: 2015-08-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the Knoevenagel condensation reaction catalyzed by ZIFs

Method used

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  • Preparation method and catalysis applications of efficient and simple zeolite imidazole framework ZIF-8 crystals with different morphologies
  • Preparation method and catalysis applications of efficient and simple zeolite imidazole framework ZIF-8 crystals with different morphologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First, 8 mmol of zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) Dissolve in 1.4mol of methanol, stir until fully dissolved; then, dissolve 64.4mmol of 2-methylimidazole (Mim) in 1.4mol of methanol, stir until fully dissolved; mix the above two solutions and place in a beaker Stir vigorously for 12 hours, seal with plastic wrap, centrifuge (8000r / min, 5min) after obtaining a milky white suspension, wash with methanol 3 times, and centrifugally filter, 60 o C dried for 15 hours to obtain the ZIF-8 crystal of the zeolite imidazole framework. Product is identified as ZIF-8 through X-ray powder diffraction; Powder X-ray diffraction result is as follows figure 1 As shown, the material morphology was obtained by scanning electron microscope results, such as figure 2 As shown in the figure, it can be seen that the material has a regular octahedral structure and is uniform in size.

Embodiment 2

[0042] First, 8 mmol of zinc sulfate heptahydrate (Zn(SO 4 ) 2 ·7H 2 O) Dissolve in 1.4mol of methanol, stir until fully dissolved; then, dissolve 64.4mmol of 2-methylimidazole (Mim) in 1.4mol of methanol, stir until fully dissolved; mix the above two solutions and place in a beaker Stir vigorously for 12 hours, seal with plastic wrap, centrifuge (8000r / min, 5min) after obtaining a milky white suspension, wash with methanol twice, and centrifugally filter, 60 o C and dried for 12 hours to obtain the ZIF-8 crystal of the zeolite imidazole framework. The obtained product is identified by X-ray powder diffraction and scanning electron microscope (similar to ZIF-8 prepared in Example 1), which shows that it is ZIF-8 with regular octahedral structure.

Embodiment 3

[0044] First, 8 mmol of zinc chloride (ZnCl 2 ) was dissolved in 1.4mol of methanol and stirred until fully dissolved; then, 64.4mmol of 2-methylimidazole (Mim) was dissolved in 1.4mol of methanol and stirred until fully dissolved; the above two solutions were mixed and placed in a beaker vigorously Stir for 12 hours, seal with plastic wrap, centrifuge (8000r / min, 5min) after obtaining a milky white suspension, and wash with methanol 5 times, centrifugal filter, 60 o C dried for 24 hours to obtain the zeolite imidazole framework ZIF-8 crystal. The obtained product is identified by X-ray powder diffraction and scanning electron microscope (similar to ZIF-8 prepared in Example 1), which shows that it is ZIF-8 with regular octahedral structure.

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Abstract

The present invention relates to a preparation method and catalysis applications of efficient and simple zeolite imidazole framework ZIF-8 crystals with different morphologies, and belongs to the technical field of porous material synthesis. The preparation method comprises: respectively dissolving a zinc salt and 2-methylimidazole in a certain amount of methanol, stirring to completely dissolve, carrying out mixing stirring on the two solutions for 10 min to obtain a white emulsion, and carrying out centrifuged washing and drying to obtain the ZIF-8 crystal. According to the method of the present invention, the different zinc salts are used to obtain the ZIF-8 crystals with good crystallinity while the ZIF-8 prepared from different zinc slats have significant difference in the particle sizes, the specific surface areas and the pore size distribution. The present invention further discloses applications of the ZIF-8 as a Knoevenagel reaction catalyst, wherein the ZIF-8 has advantages of high catalytic efficiency, mild reaction conditions, high yield, environmental protection, no toxicity, good application prospect, and the like.

Description

technical field [0001] The invention relates to a preparation method and catalytic application of ZIF-8 crystals with different particle sizes, in particular to a preparation method and catalytic application of an efficient and simple zeolite-like imidazole framework ZIF-8 crystal with different shapes, belonging to the technical field of porous material synthesis . Background technique [0002] Metal-organic framework (MOF) is a rigid one-dimensional, two-dimensional or three-dimensional porous material composed of metal ions or clusters and organic ligands connected by covalent bonds. MOF has permanent porosity, tunable size, and easy modification. Organic functional groups and stable structure. MOFs have been widely used in gas (H 2 、CH 4 , CO 2 etc.), storage and separation, and catalysis, but most MOFs are unstable in water or harsh conditions (such as strong bases, acids, or highly polar organic solvents), which greatly limits their industrial applications. [000...

Claims

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Application Information

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IPC IPC(8): C07F3/06B01J31/22C07C253/30C07C255/34
CPCC07F3/06B01J31/1815B01J2231/341B01J2531/0213B01J2531/0269B01J2531/26C07C253/30
Inventor 余林杨丽丽
Owner GUANGDONG UNIV OF TECH
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