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Silicon-containing boehmite catalyst carrier and preparation method thereof

A technology of catalyst carrier and boehmite, which is applied in the direction of catalyst carrier, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems that are difficult to eliminate

Active Publication Date: 2020-06-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutralization reaction is an exothermic reaction. With the mixing of acid and alkali solutions, the temperature of the system gradually rises, which has a great impact on the pH value measured by the pH meter. Although the method of temperature compensation can eliminate part of the impact, it is difficult to eliminate all of it.

Method used

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  • Silicon-containing boehmite catalyst carrier and preparation method thereof

Examples

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preparation example Construction

[0025] In a second aspect, the present invention provides a method for preparing a silicon-containing boehmite catalyst carrier, wherein the method comprises the following steps:

[0026] (1) Gibbsite is contacted with sodium hydroxide to obtain a sodium metaaluminate solution;

[0027] (2) adding the sodium metaaluminate solution dropwise to the aluminum sulfate solution under stirring conditions;

[0028] (3) sodium metaaluminate solution, aluminum sulfate solution and water glass are added dropwise to the suspension obtained in step (2) simultaneously under stirring conditions;

[0029] (4) crystallize the product obtained in step (3) under crystallization conditions;

[0030] (5) Filter the crystallized product obtained in step (4), and wash the filtered solid with deionized water and dry it.

[0031] According to the preparation method of the present invention, wherein, in step (1), the contacting conditions may be as follows: the temperature is 120-160°C, and the time ...

Embodiment 1

[0054] This example is to illustrate the silicon-containing boehmite catalyst carrier prepared by the method of the present invention.

[0055] (1) Weigh 10 kg of aluminum sulfate solution (aluminum oxide content is 10.2wt.%) with a concentration of 1mol / kg, and add it in a sodium metaaluminate solution with a molar ratio of Na / Al=4.5 (aluminum oxide content 6.6wt.%), the mass ratio of sodium metaaluminate solution to aluminum sulfate solution is 0.65 in terms of alumina, and the pH of the system is 9.5, which is used as the bottom liquid.

[0056] (2) Carry out co-current feeding with step (1) as the bottom liquid: add sodium metaaluminate solution, aluminum sulfate solution and water glass simultaneously in the bottom liquid, keep sodium metaaluminate, aluminum sulfate and water glass in the process The mass ratio (according to alumina and silica) is 6.5:10:0.19, and the pH of the system is 9.5.

[0057] (3) The obtained slurry was transferred to a high-pressure reactor, an...

Embodiment 2

[0061] This example is to illustrate the silicon-containing boehmite catalyst carrier prepared by the method of the present invention.

[0062] (1) Weigh 1 kg of aluminum sulfate solution (aluminum oxide content is 10.2wt.%) with a concentration of 0.9mol / kg, and add the molar ratio of Na / Al=4.5 in the sodium metaaluminate solution (oxidized The aluminum content is 7.14wt.%) and the mass ratio of sodium metaaluminate solution to aluminum sulfate solution is 0.70 based on alumina, and the pH of the system is 9.2, which is used as the bottom solution.

[0063] (2) Carry out co-current feeding with step (1) as the bottom liquid: add sodium metaaluminate solution, aluminum sulfate solution and water glass simultaneously in the bottom liquid, keep sodium metaaluminate, aluminum sulfate and water glass in the process The mass ratio (according to alumina and silica) is 7:10:1.54, and the pH of the system is 9.2.

[0064] (3) The obtained slurry was transferred to a high-pressure rea...

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Abstract

The present invention relates to the technical field of catalyst carrier preparation, and specifically relates to a silicon-containing boehmite catalyst carrier and a preparation method thereof. Wherein, the catalyst carrier is a porous material, the porous material is a porous silica-alumina material, the porous silica-alumina is in the shape of nanosheets, the silicon oxide content is 1-20wt.%, and the specific surface area is 800-1000m 2 / g, pore volume is 1.7-4.0cm 3 / g, the maximum pore size is 2‑30nm. The present invention controls the reaction end point by regulating the mass ratio of sodium metaaluminate, aluminum sulfate and water glass based on the alumina and silicon oxide contents, and can prepare nanosheet-shaped silicon-containing thin aluminum with large specific surface area and large pore volume. Stone catalyst carrier, and the method has simple process, is green and environmentally friendly, and is easy to be industrialized.

Description

technical field [0001] The invention relates to the technical field of catalyst carrier preparation, in particular to a silicon-containing boehmite catalyst carrier and a preparation method thereof. Background technique [0002] Boehmite has a large specific surface area and pore volume, and can be used to prepare alumina used as an adsorbent and a catalyst carrier. Silicon-containing boehmite has more optimized acidity because the introduction of silicon destroys the six-coordination structure of aluminum, and is more suitable for use as a catalyst carrier. [0003] In patent CN102663409A, a mixed solution of sodium metaaluminate and water glass is added dropwise to an aluminum sulfate solution to prepare fibrous silicon-containing boehmite with a silicon content of 0.05-3 wt%, and a fiber diameter of 6-15 nm. [0004] In the preparation process of silicon-containing boehmite, acid-base neutralization method is a common method. The neutralization reaction is an exothermic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/12B01J32/00B01J35/10
CPCB01J21/12B01J35/618B01J35/638B01J35/647
Inventor 宋家庆孙建川王旭辉陈帅奇徐向宇
Owner BEIJING UNIV OF CHEM TECH