A-type zeolite/ZIF-8 core-shell structure microsphere as well as preparation method and application thereof

A technology of ZIF-8 and core-shell structure, which is applied in the field of A-type zeolite/ZIF-8 core-shell structure microspheres and its preparation, can solve the problem of small specific surface area of ​​binder-free A-type zeolite microspheres, and achieve good Potential application value, significant economic value and social benefit, effect of high specific surface area

Inactive Publication Date: 2021-02-09
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of A-type zeolite / ZIF-8 core-shell structure microsphere and its preparation method and application; Gas adsorption and separation, its rich pore structure improves the performance of gas adsorption and separation, and has significant economic value and social benefits

Method used

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  • A-type zeolite/ZIF-8 core-shell structure microsphere as well as preparation method and application thereof
  • A-type zeolite/ZIF-8 core-shell structure microsphere as well as preparation method and application thereof
  • A-type zeolite/ZIF-8 core-shell structure microsphere as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0029] A type A zeolite / ZIF-8 core-shell structure microsphere is characterized in that the core-shell structure microsphere is formed by using type A zeolite as the core structure and using type A zeolite and ZIF-8 as the shell layer.

[0030] The preparation method of the above-mentioned A-type zeolite / ZIF-8 core-shell structure microspheres comprises the following steps:

[0031] (1) Put the silicon source into the syringe, invert it to remove air bubbles, drop the silicon source into the lye drop by drop through a 0.35mm needle, and solidify to form microspheres; wherein the silicon source is silica sol in which chitosan has been dissolved aqueous solution, the formed microspheres are silica sol / chitosan hybrid microspheres; the alkali solution is 2wt% sodium hydroxide solution;

[0032] (2) Add the microspheres into the aluminum source and soak for 24 hours, then seal and transfer to an oven at 80° C. for crystallization for 3 hours; wash the crystallized microspheres wit...

Embodiment 2

[0039] A type A zeolite / ZIF-8 core-shell structure microsphere is characterized in that the core-shell structure microsphere is formed by using type A zeolite as the core structure and using type A zeolite and ZIF-8 as the shell layer.

[0040] The preparation method of the above-mentioned A-type zeolite / ZIF-8 core-shell structure microspheres comprises the following steps:

[0041] (1) Put the silicon source into the syringe, invert it to remove air bubbles, drop the silicon source into the lye drop by drop through a 0.35mm needle, and solidify to form microspheres; wherein the silicon source is silica sol in which chitosan has been dissolved Aqueous solution, the formed microspheres are silica sol / chitosan hybrid microspheres; the lye is 3wt% sodium hydroxide solution;

[0042] (2) Add the microspheres into the aluminum source and immerse them for 20 hours, then seal them and transfer them to an oven at 90° C. for crystallization for 2 hours; wash the crystallized microspher...

Embodiment 3

[0047] A type A zeolite / ZIF-8 core-shell structure microsphere is characterized in that the core-shell structure microsphere is formed by using type A zeolite as the core structure and using type A zeolite and ZIF-8 as the shell layer.

[0048] The preparation method of the above-mentioned A-type zeolite / ZIF-8 core-shell structure microspheres comprises the following steps:

[0049] (1) Put the silicon source into the syringe, invert it to remove air bubbles, drop the silicon source into the lye drop by drop through a 0.35mm needle, and solidify to form microspheres; wherein the silicon source is silica sol in which chitosan has been dissolved Aqueous solution, the formed microspheres are silica sol / chitosan hybrid microspheres; the lye is 5wt% sodium hydroxide solution;

[0050] (2) Add the microspheres into the aluminum source and soak for 18 hours, then seal and transfer to an oven at 70° C. for crystallization for 5 hours; wash the crystallized microspheres with deionized ...

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Abstract

The invention discloses an A-type zeolite/ZIF-8 core-shell structure microsphere as well as a preparation method and application thereof. The microsphere with the core-shell structure is formed by taking A-type zeolite as a core structure and taking A-type zeolite and ZIF-8 as a shell layer. The preparation method comprises the following steps of (1) adding a silicon source into alkali liquor, andcuring to form microspheres, (2) dipping the microspheres into an aluminum source, crystallizing, washing, drying and calcining, (3) wetting the microspheres, and preparing a zinc nitrate hexahydrateaqueous solution and a dimethylimidazole aqueous solution, (4) respectively dipping the wetted microspheres into a zinc nitrate hexahydrate aqueous solution and a dimethylimidazole aqueous solution,and carrying out oscillation reaction to obtain a pre-product, and (5) washing and drying the pre-product to obtain the A-type zeolite/ZIF-8 core-shell structure microsphere. The preparation method issimple, the preparation cost is low, the problem of small specific surface area of the binder-free A-type zeolite microspheres is solved, the A-type zeolite/ZIF-8 core-shell structure microspheres provide rich pore channel structures, the gas adsorption separation performance is improved, and remarkable economic value and social benefits are achieved.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a type A zeolite / ZIF-8 core-shell microsphere and its preparation method and application. Background technique [0002] As an important inorganic material, zeolite has a regular and ordered three-dimensional microporous structure. Its traditional applications are mainly concentrated in the fields of adsorption, separation, ion exchange, and catalysis. Zeolite mainly exists in the form of powder. In practical applications, for the convenience of use, the zeolite powder will be made into a certain shape under the action of a binder. strive for goals. Yu et al. limited the growth of type A zeolite in chitosan microspheres by using in-situ sol-gel synthesis, and removed chitosan by roasting to obtain binder-free type A zeolite microspheres. The specific surface area of ​​the material calculated by the BET method is 30m 2 / g, which is larger than the specific surface area of ​​th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCB01J20/226B01J20/18B01J20/28021B01D53/02
Inventor 苗进凯贡洁徐欣钰童霏周玉琪王尚杰沈剑飞宋小兵
Owner JIANGSU UNIV OF TECH
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