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A method for synthesizing zsm-5 zeolite monolith without template and without binder

A ZSM-5, monolithic technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of reducing the effective utilization rate of molecular sieve, environmental pollution and production cost, blocking molecular sieve pores, etc. problem, to achieve the effect of green synthesis process, low cost and short crystallization time

Active Publication Date: 2021-06-25
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current method of synthesizing ZSM-5 zeolite, the template method is mainly used for synthesis, which is prone to environmental pollution and high production costs during the production process. Therefore, a template-free method for synthesizing ZSM-5 zeolite has emerged.
[0004] The reported synthesized ZSM-5 zeolites are all powders, and there are problems such as difficult separation in practical applications; the synthesis of the reported binder-free ZSM-5 zeolite molecular sieves all need to use a template agent, and high temperature is required to remove the template In addition, the formation of ZSM-5 block materials mostly requires the addition of binders, the existence of binders will wrap molecular sieves, reduce the effective utilization of molecular sieves and block the pores of molecular sieves.

Method used

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  • A method for synthesizing zsm-5 zeolite monolith without template and without binder
  • A method for synthesizing zsm-5 zeolite monolith without template and without binder
  • A method for synthesizing zsm-5 zeolite monolith without template and without binder

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Effect test

Embodiment 1

[0043] A method for synthesizing a ZSM-5 zeolite monolith without a template and without a binder in this embodiment is as follows: Dissolve 0.37g of aluminum sulfate octadecahydrate in 30g of water to obtain a clear solution, stir for 15min, and add 5.49g of anhydrous silicon metasilicon sodium metasilicate to make a mixed solution (among them, anhydrous sodium metasilicate can be used as a silicon source; as an alkaline reagent, it has the property of making the solution strongly alkaline in water, pH>>10.5), and stir at room temperature until it dissolves Add dropwise concentrated sulfuric acid with a molar concentration of 18M to adjust the pH of the system to 10.5 to obtain an aluminosilicate gel mixture; after aging for 20 hours under alkaline conditions, put the mixture into a stainless steel polytetrafluoroethylene hydrothermal reaction kettle, 180 The crystallized product was crystallized between ℃ for 3 days, and then the crystallized product was cooled to room temper...

Embodiment 2

[0052] A method for synthesizing a ZSM-5 zeolite monolith without a template and without a binder in this embodiment is as follows: dissolving 0.50 g of aluminum sulfate octadecahydrate in 30 g of water to obtain a clear solution, adding 5.49 g of anhydrous sodium metasilicate to prepare After stirring at room temperature until it dissolves, add concentrated sulfuric acid with a molar concentration of 18M to adjust the pH of the system to 10.5 to obtain an aluminosilicate gel mixture; after aging for 24 hours under alkaline conditions, put the mixture into a stainless steel polymer In a tetrafluoroethylene hydrothermal reaction kettle, the crystallized product was crystallized at 180°C for 3 days, then the crystallized product was cooled to room temperature, filtered with suction, washed with deionized water three times, and dried at 100°C for 8 hours to obtain ZSM- 5 zeolite monoliths.

[0053] The reaction raw material mol ratio of the present embodiment is: 1SiO 2 :0.017Al...

Embodiment 3

[0056] A method for synthesizing a ZSM-5 zeolite monolith without a template and without a binder in this embodiment is as follows: dissolving 0.75g of aluminum sulfate octadecahydrate in 30g of water to obtain a clear solution, adding 5.49g of anhydrous sodium metasilicate to prepare After stirring at room temperature until it dissolves, add concentrated sulfuric acid with a molar concentration of 18M to adjust the pH of the system to 10.5 to obtain an aluminosilicate gel mixture; after aging for 24 hours under alkaline conditions, put the mixture into a stainless steel polymer In a tetrafluoroethylene hydrothermal reaction kettle, the crystallized product was crystallized at 180°C for 3 days, then the crystallized product was cooled to room temperature, filtered with suction, washed with deionized water three times, and dried at 100°C for 8 hours to obtain ZSM- 5 zeolite monoliths.

[0057] The reaction raw material mol ratio of the present embodiment is: 1SiO 2 :0.025Al 2...

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Abstract

The invention discloses a method for synthesizing a ZSM‑5 zeolite monolith without a template and without a binder, and belongs to the field of zeolite synthesis. The method of the invention uses silicon source and aluminum source as raw materials, adopts a one-step hydrothermal method, does not add any template agent, and directly synthesizes a ZSM-5 zeolite monolith without binder. The process is green and environmentally friendly, simple and convenient, and low in cost. The synthesized ZSM-5 zeolite monolith overcomes the diffusion limitation of traditional powder microporous zeolite and the difficulty of separating the catalyst and the product, and can be used to efficiently catalyze the synthesis of 5-hydroxymethylfurfural from fructose; and the conversion rate of fructose can reach 100% , the yield of 5‑hydroxymethylfurfural can reach more than 98%, and has a very good industrial application prospect.

Description

technical field [0001] The invention relates to a method for synthesizing a ZSM-5 zeolite monolith without a template and without a binder, and belongs to the field of zeolite synthesis. Background technique [0002] As a typical microporous material, zeolite has rich pore structure, regular pore distribution, high hydrothermal stability and strong acid center. It is widely used in the fields of gas separation and storage, heterogeneous catalysis, sensors and drug delivery. It has a wide range of applications and has created immeasurable value for social development. With the continuous development of industry, zeolite materials with a single pore size and composition can no longer meet the requirements of practical applications. Due to their small pore size, zeolite materials are not suitable for catalytic and adsorption processes involving larger molecular size compounds or biomacromolecules. If a zeolite material with mesopores or macropores forming a hierarchical pore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38
CPCC01B39/38
Inventor 张微黄荣邓瑶瑶向梅王文娟
Owner CHANGZHOU INST OF TECH