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Method for synthesizing hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline

A ZIF-8 and channel technology, applied in the field of multi-level channel ZIF-8 synthesis, can solve the problems of failure to obtain TEM images, poor stability of MOFs, and inability to visually observe the pore structure, etc., to improve the adsorption effect, overcome the Easy to agglomerate and improve the effect of diffusion and mass transfer

Inactive Publication Date: 2013-01-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor stability of MOFs, a clear transmission electron microscope image cannot be obtained, and its pore structure cannot be observed intuitively.

Method used

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  • Method for synthesizing hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline
  • Method for synthesizing hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline
  • Method for synthesizing hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Adding Sodium Dodecyl Sulfate to Synthesize Hierarchical Channel ZIF-8

[0031] The present embodiment provides a kind of preparation method of multi-stage channel ZIF-8, it comprises the following steps:

[0032] Dissolve 6g of sodium dodecyl sulfate (SDS) in 37.5g of deionized water, then add 5.16g of zinc nitrate hexahydrate, stir to dissolve; dissolve 5.69g of 2-methylimidazole (MIM) in another 37.5g of deionized In water, in a water bath at 55°C, the 2-methylimidazole solution is added to the solution of sodium lauryl sulfate and zinc nitrate hexahydrate, and stirred for 30 minutes to obtain a reaction sol; the molar ratio of the substances contained in the reaction sol system is Zn(NO 3 ) 2 ·6H2 O:MIM:H 2 O:SDS=1:4:240:1.2;

[0033] Put the reaction sol into a polytetrafluoroethylene high-pressure reactor, crystallize at 140°C for 24 hours, filter the reaction sol to separate the product, wash it with deionized water for 3-5 times, and then dry it at...

Embodiment 2

[0043] Embodiment 2 increases SDS / Zn (NO 3 ) 2 ·6H 2 Synthesis of Hierarchical Channel ZIF-8 with O Molar Ratio

[0044] The present embodiment provides a kind of preparation method of multistage pore ZIF-8 and deep desulfurization adsorbent, it is to change 6g SDS in embodiment 1 into 7g SDS, the molar ratio of the substance contained in the reaction sol system is Zn(NO 3 ) 2 ·6H 2 O:MIM:H 2 O:SDS=1:4:240:1.4; other operations were the same as in Example 1, and the multi-level channel ZIF-8 and Cu / hierarchical channel ZIF-8 for deep desulfurization were synthesized.

[0045] The X-ray diffraction spectrum of the obtained multi-level channel ZIF-8 is shown in figure 1 In the curve C, the pore structure data are shown in Table 1, and the nitrogen adsorption and desorption results are as follows figure 2 Shown in curve C.

Embodiment 3

[0046] Embodiment 3 reduces SDS / Zn (NO 3 ) 2 ·6H 2 Synthesis of Hierarchical Channel ZIF-8 with O Molar Ratio

[0047] The present embodiment provides a kind of preparation method of multistage channel ZIF-8 and deep desulfurization adsorbent, it is to change 6g SDS in embodiment 1 into 4g SDS, the molar ratio of the substance contained in the reaction sol system is Zn(NO 3 ) 2 ·6H 2 O:MIM:H 2 O:SDS=1:4:240:0.8; other operations were the same as in Example 1, and the multi-level channel ZIF-8 and Cu / hierarchical channel ZIF-8 for deep desulfurization were synthesized.

[0048] The X-ray diffraction spectrum of the obtained multi-level channel ZIF-8 is shown in figure 1 In the curve D, the pore structure data are shown in Table 1, and the nitrogen adsorption and desorption results are as follows figure 2 Shown in curve D.

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Abstract

The invention relates to a method for synthesizing a hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline. The method comprises the following steps of: dissolving anionic surfactant into deionized water, adding an inorganic salt of zinc, adding 2-methylimidazole after the inorganic salt is dissolved, and mixing uniformly to obtain a sol-like substance; crystallizing the sol-like substance, and separating, washing and drying the solid product to obtain hierarchical pore ZIF-8 powder crystal; and extracting the anionic surfactant from the hierarchical pore ZIF-8 powder crystal by using a sodium hydroxide solution and an organic solvent as extracting agents, and thus obtaining the hierarchical pore ZIF-8. A preparation method for a corresponding deep desulfurization agent comprises the following steps of: preparing the hierarchical pore ZIF-8 according to the method for synthesizing the hierarchical pore ZIF-8; and dispersing the hierarchical pore ZIF-8 into an inorganic salt solution of copper, stirring, separating, washing and drying the solid product, roasting in a nitrogen atmosphere, and thus obtaining a copper-carrying hierarchical pore ZIF-8, namely the deep desulfurization agent.

Description

technical field [0001] The invention relates to a synthesis method of multi-stage pore ZIF-8 and its application in deep desulfurization and adsorption of gasoline, belonging to the technical field of porous materials and petroleum catalysts. Background technique [0002] Metal-organic frameworks (Metal-Organic Frameworks, MOFs), also known as metal-organic framework compounds, metal-organic coordination polymers, which use metal ions as the coordination center, and form a complex with multi-dentate ligands. Complexes with a certain spatial structure. MOFs have the characteristics of high porosity, good thermal and chemical stability, large specific surface area, and high dispersion of surface active sites, which makes MOFs a new type of porous material that has been widely concerned by the academic community in the past decade. As early as the mid-1990s, the first generation of MOFs had been synthesized, but their porosity was not high, and when the guest molecules were re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C07F3/06C10G25/00
Inventor 范煜王世华李国旗吴莉芳石冈鲍晓军刘海燕
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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