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A kind of zif-8@mcm-41 molecular sieve and preparation method thereof

A technology of MCM-41 and ZIF-8, which is applied in the direction of chemical instruments and methods, other chemical processes, physical/chemical process catalysts, etc., can solve the problems of easy decomposition, limited application, and the inability of zeolite imidazolate framework materials to withstand temperature, etc. Achieve the effect of good porosity, low density and high hydrothermal stability

Active Publication Date: 2018-12-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the zeolite imidazolate framework material can not withstand too high temperature, and it is easy to decompose in the environment of strong acid and strong alkali, which greatly limits its application in the field of catalysis.

Method used

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  • A kind of zif-8@mcm-41 molecular sieve and preparation method thereof
  • A kind of zif-8@mcm-41 molecular sieve and preparation method thereof
  • A kind of zif-8@mcm-41 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 0.585g of zinc nitrate hexahydrate in 4g of deionized water to make a zinc nitrate solution, dissolve 11.35g of 2-methylimidazole in 40g of deionized water to make a 2-methylimidazole solution, mix the two and then stir for 0.5 h, centrifuged, washed and dried to obtain white powder ZIF-8 particles. Such as Figure 5 Shown is the scanning electron microscope image of the ZIF-8 particles obtained in this example. It can be seen from the figure that the particle size of the ZIF-8 particles is 50-70 nm, and the particle size is uniform.

[0026] Mix 2 g of the obtained ZIF-8 granules with 0.125 g of surfactant CTAB and 20 g of deionized water, then add 0.45 mL of NaOH solution with a concentration of 2 mol / L to adjust the pH to 9, stir and heat at 80 °C for 1 h, slowly dropwise Add 0.625mL tetraethyl orthosilicate and continue the reaction for 8h. After the reaction, let the reaction solution stand still, filter, wash, and dry to obtain a white powder, then heat ...

Embodiment 2

[0029] Dissolve 0.585g of zinc nitrate hexahydrate in 4g of deionized water to make a zinc nitrate solution, dissolve 11.35g of 2-methylimidazole in 40g of deionized water to make a 2-methylimidazole solution, mix the two and then stir for 0.5 h, centrifuged, washed and dried to obtain white powder ZIF-8 particles. Mix 2 g of the obtained ZIF-8 particles with 0.25 g of surfactant CTAB and 80 g of deionized water, then add 0.9 mL of NaOH solution with a concentration of 2 mol / L to adjust the pH value to 10, stir and heat at 80 ° C for 1 h, slowly dropwise Add 0.625mL tetraethyl orthosilicate and continue the reaction for 8h. After the reaction, let the reaction solution stand still, filter, wash, and dry to obtain a white powder, then heat the white powder to reflux in 50mL of ethanol to remove the surfactant CTAB, and finally Stand still, wash and dry to obtain white powder ZIF-8@MCM-41 molecular sieve.

[0030] figure 2 It is a scanning electron microscope image of the pro...

Embodiment 3

[0032] Dissolve 0.585g of zinc nitrate hexahydrate in 4g of deionized water to make a zinc nitrate solution, dissolve 11.35g of 2-methylimidazole in 40g of deionized water to make a 2-methylimidazole solution, mix the two and then stir for 0.5 h, centrifuged, washed and dried to obtain white powder ZIF-8 particles. Mix 2 g of the obtained ZIF-8 granules with 0.5 g of surfactant CTAB and 200 g of deionized water, then add 1.8 mL of NaOH solution with a concentration of 2 mol / L to adjust the pH to 10, stir and heat at 80 ° C for 1 h, slowly dropwise Add 0.625mL tetraethyl orthosilicate and continue the reaction for 8h. After the reaction, let the reaction solution stand still, filter, wash, and dry to obtain a white powder, then heat the white powder to reflux in 50mL of ethanol to remove the surfactant CTAB, and finally Stand still, wash and dry to obtain white powder ZIF-8@MCM-41 molecular sieve.

[0033] Figure 4 It is a scanning electron microscope picture of the product ...

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Abstract

The invention relates to a ZIF-8@MCM-41 molecular sieve and a preparation method thereof. The ZIF-8@MCM-41 molecular sieve is of a core-shell structure and is prepared with ZIF-8 particles as a core-phase material and a MCM-41 molecular sieve as a shell-phase material, wherein the MCM-41 molecular sieve is coated outside of the ZIF-8 particles. The preparation method comprises the following steps: 1) preparation of the ZIF8 particles; and 2) preparation of the ZIF-8@MCM-41 molecular sieve: dispersing the ZIF-8 particles in water, then adding a surfactant and alkali liquid, then heating the obtained dispersion liquid, slowly adding tetraethylortho silicate and continuously carrying out reaction, carrying out after-treatment so as to obtain white powder, then adding the white powder into an ethanol solution and carrying out heating reflux so as to remove the surfactant, and carrying out after-treatment so as to obtain the ZIF-8@MCM-41 molecular sieve. The ZIF-8@MCM-41 molecular sieve prepared by using the method provided by the invention has the advantages of large specific surface area, high porosity and excellent catalytic reaction activity.

Description

technical field [0001] The invention relates to the technical field of metal-organic framework materials, in particular to a ZIF-8@MCM-41 molecular sieve and a preparation method thereof. Background technique [0002] Zeolite imidazolate frameworks (ZIFs) are polycrystalline materials, which have a similar framework structure to zeolite porous materials, have very stable chemical properties, and are resistant to water and various organic solvents. The T-Im-T angle in ZIFs is 145°, which is similar to the Si-O-Si bond angle in zeolite, and the bond length is longer than that of ordinary zeolite, which has superior performance in gas adsorption and separation. Among them, ZIF-8 has an ultra-high specific surface area and porosity, and has a good effect on CO 2 、CH 4 and H 2 And many other gases have strong adsorption capacity, and have made great contributions to the fields of gas storage and gas separation. [0003] However, zeolite imidazolate framework materials cannot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J35/10B01J20/22B01J20/32
Inventor 陈丽华吴雪妍欧阳逸挺余勇李昱邓兆苏宝连
Owner WUHAN UNIV OF TECH
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