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Method for preparing mesoporous molecular sieve with high aluminum content under neutral condition

A technology of mesoporous molecular sieves and neutral conditions, applied in the direction of molecular sieve compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problem of product quality, limited number of hydroxyl radicals, weak oxidation of sodium persulfate, etc. problems, to achieve the effect of increasing sodium content and acidity

Active Publication Date: 2022-04-01
BEIJING UNIV OF CHEM TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is how to solve the existing method of obtaining mesoporous molecular sieves under neutral conditions by using sodium persulfate as an oxidizing agent. Because sodium persulfate has a weaker oxidizing property, the number of hydroxyl radicals produced limited, resulting in issues that affect the quality of the product

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  • Method for preparing mesoporous molecular sieve with high aluminum content under neutral condition
  • Method for preparing mesoporous molecular sieve with high aluminum content under neutral condition
  • Method for preparing mesoporous molecular sieve with high aluminum content under neutral condition

Examples

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Embodiment 1

[0043] A method for preparing a high aluminum content mesoporous molecular sieve under neutral conditions, comprising the following steps:

[0044] (1) Dissolution of template agent

[0045] Mix 13.5g of F68 with 60g of deionized water in a beaker, put it in a water bath and heat at 25°C, and stir with a precision-timed electric stirrer at 150r / min for 3h to obtain a completely dissolved template agent solution;

[0046] (2) Preparation of silicate solution

[0047] Mix 38g of water glass with 55g of deionized water in a beaker, put it in a water bath and heat at 50°C, stir with a magnetic stirrer at 40r / min for 1h, then add 1.3g of potassium persulfate and 0.8g sodium chloride, continue to stir for 4h, until the solution becomes a clear solution;

[0048] (3) Add the above-mentioned silicate solution dropwise to the template agent solution at a speed of 5mL / min to form a gel system, under the condition of a 50°C water bath, stir with a precision timing electric stirrer at a...

Embodiment 2

[0054] A method for preparing a high aluminum content mesoporous molecular sieve under neutral conditions, comprising the following steps:

[0055] (1) Dissolution of template agent

[0056] Mix 10g of P123 with 50g of deionized water in a beaker, put it in a water bath and heat at 60°C, and stir with a precision-timed electric stirrer at 150r / min for 5h to obtain a completely dissolved template agent solution;

[0057] (2) Preparation of silicate solution

[0058] Take 25g of water glass and 50g of deionized water mixed in a beaker, put it in a water bath and heat at 60°C, stir with a magnetic stirrer at 60r / min for 3h, then add 1.5g of potassium persulfate and 0.5g sodium chloride, continue to stir for 2h, until the solution becomes a clear solution;

[0059] (3) Add the above-mentioned silicate solution dropwise to the template agent solution at a speed of 5mL / min to form a gel system, under the condition of a 50°C water bath, stir with a precision timing electric stirrer...

Embodiment 3

[0062] A method for preparing a high aluminum content mesoporous molecular sieve under neutral conditions, comprising the following steps:

[0063] (1) Dissolution of template agent

[0064] Mix 8.5g of F127 with 60g of deionized water in a beaker, put it into a water bath and heat at 50°C, and stir with a precision-timed electric stirrer at 150r / min for 3h to obtain a completely dissolved template agent solution;

[0065] (2) Preparation of silicate solution

[0066] Mix 50g of water glass with 55g of deionized water in a beaker, put it in a water bath and heat at 50°C, stir with a magnetic stirrer at 80r / min for 2h, then add 0.3g of potassium persulfate and 1.8g sodium chloride, continue to stir for 4h, until the solution becomes a clear solution;

[0067] (3) Add the above-mentioned silicate solution dropwise to the template agent solution at a speed of 5mL / min to form a gel system, and under the condition of a 50°C water bath, use a precision-timed electric stirrer to st...

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Abstract

The invention discloses a method for preparing a mesoporous molecular sieve with high aluminum content under a neutral condition. The method comprises the following steps: (1) dissolving a template agent; (2) mixing a silicon source, potassium persulfate, sodium chloride and water to prepare a silicate solution; (3) dropwise adding the silicate solution into the template solution to generate a gel system; and (4) performing crystallization, suction filtration, drying and calcination on the initial mesoporous molecular sieve gel to obtain the mesoporous molecular sieve. The preparation method comprises the following steps: adding potassium persulfate and sodium chloride into an aqueous solution containing a silicon source for hydrolysis, then uniformly mixing with a nonionic surfactant solution, adding an aluminum source, and initiating a free radical reaction by using hydroxyl free radicals generated by the potassium persulfate, so as to obtain the silicon-based surfactant. According to the invention, the sodium salt is added into the template agent, so that the charge matching effect between the template agent and the inorganic silicon source and the self-assembly process under the neutral condition are facilitated, and the sodium content and acidity of the molecular sieve product are greatly improved due to the existence of the sodium salt, so that the preparation of the mesoporous molecular sieve with high aluminum content and strong acidity is realized.

Description

technical field [0001] The invention relates to the technical field of synthesis of mesoporous molecular sieves, in particular to a method for preparing high-aluminum content mesoporous molecular sieves under neutral conditions. Background technique [0002] Mesoporous molecular sieves, such as SBA-15, have received a lot of attention due to their good hydrothermal stability and high specific surface area, and are widely used in industrial production. However, a large amount of inorganic acid is often used in the synthesis process, which not only causes environmental pollution and pipeline corrosion, but also metal atoms are not easy to enter the molecular sieve wall under strong acid conditions, so the product molecular sieve acidity is weak. This weakness greatly limits the application of mesoporous molecular sieves in catalytic reactions. Therefore, it is crucial to develop the synthesis technology of mesoporous molecular sieves with high aluminum content. [0003] Li e...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B37/00
Inventor 刘洪涛邓亦雄周家羽汪杰刘海燕岳源源
Owner BEIJING UNIV OF CHEM TECH
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