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Preparation method of mesoporous ruthenium-aluminum composite catalyst

A catalyst-aluminum composite technology is applied in the field of preparation of mesoporous ruthenium-aluminum catalysts, which can solve problems such as easy falling off of catalysts, and achieve the effects of improving stability and balance, increasing gas content, and improving bonding fastness.

Active Publication Date: 2021-06-01
浙江工业大学上虞研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a method for preparing a mesoporous ruthenium-aluminum composite catalyst, which solves the problem that the catalyst is easy to fall off, utilizes the problem of co-hydrolysis and agglomeration of alumina and ruthenium oxide, and forms The formation of ruthenium particles greatly improves the bond fastness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a mesoporous ruthenium-aluminum composite catalyst, comprising the steps of:

[0020] Step 1, adding aluminum chloride and ruthenium chloride to 1L of absolute ethanol for low-temperature ultrasonic dispersion to form a mixed solution; then distilling and concentrating the mixed solution under reduced pressure, adding it to a mold and extruding to form spherical particles; the aluminum chloride The molar ratio with ruthenium chloride is 1:1.2, the concentration of described aluminum chloride in dehydrated alcohol is 30g / L, the temperature of described low-temperature ultrasonic dispersion is 2 ℃, ultrasonic frequency is 40kHz; The described vacuum distillation The pressure is 80% of the standard atmospheric pressure, and the temperature is 60°C; the extrusion pressure is 0.3MPa, and the temperature is 80°C;

[0021] Step 2: Add ethyl cellulose to 1L of ether and stir at low temperature to form a solution, then add ammonium carbonate and stir even...

Embodiment 2

[0026] A preparation method of a mesoporous ruthenium-aluminum composite catalyst, comprising the steps of:

[0027] Step 1, adding aluminum chloride and ruthenium chloride to 1L of absolute ethanol for low-temperature ultrasonic dispersion to form a mixed solution; then distilling and concentrating the mixed solution under reduced pressure, adding it to a mold and extruding to form spherical particles; the aluminum chloride The molar ratio with ruthenium chloride is 1:1.5, the concentration of described aluminum chloride in dehydrated alcohol is 60g / L, the temperature of described low-temperature ultrasonic dispersion is 6 ℃, ultrasonic frequency is 80kHz; The described vacuum distillation The pressure is 90% of the standard atmospheric pressure, and the temperature is 70°C; the extrusion pressure is 0.6MPa, and the temperature is 100°C;

[0028] Step 2: Add ethyl cellulose to 1L of ether and stir at low temperature to form a solution, then add ammonium carbonate and stir eve...

Embodiment 3

[0033] A preparation method of a mesoporous ruthenium-aluminum composite catalyst, comprising the steps of:

[0034] Step 1, adding aluminum chloride and ruthenium chloride to 1L of absolute ethanol for low-temperature ultrasonic dispersion to form a mixed solution; then distilling and concentrating the mixed solution under reduced pressure, adding it to a mold and extruding to form spherical particles; the aluminum chloride The molar ratio with ruthenium chloride is 1:1.3, the concentration of described aluminum chloride in dehydrated alcohol is 50g / L, the temperature of described low-temperature ultrasonic dispersion is 4 ℃, ultrasonic frequency is 60kHz; The described vacuum distillation The pressure is 85% of the standard atmospheric pressure, and the temperature is 65°C; the extrusion pressure is 0.5MPa, and the temperature is 90°C;

[0035] Step 2: Add ethyl cellulose to 1L ether and stir at low temperature to form a solution, then add ammonium carbonate and stir evenly ...

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Abstract

The invention discloses a preparation method of a mesoporous ruthenium-aluminum catalyst. The preparation method comprises the following steps: adding aluminum chloride and ruthenium chloride into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion to form a mixed solution; then carrying out reduced pressure distillation and concentration on the mixed solution, adding into a mold, and extruding to form spherical particles; adding ethyl cellulose into diethyl ether, stirring at a low temperature to form a dissolving solution, then adding ammonium carbonate, uniformly stirring to form a suspension, spraying the suspension onto the spherical particles, and drying at a constant temperature to obtain first coating particles; adding ethyl cellulose into diethyl ether, uniformly stirring, then uniformly spraying on the surfaces of the first coating particles, and drying at constant temperature to obtain second coating particles; and standing the second coating particles in a reaction kettle at a constant temperature, heating, adding the second coating particles into absolute ethyl alcohol for ultrasonic treatment, and filtering and washing to obtain the mesoporous ruthenium-aluminum composite catalyst. The problem of co-hydrolysis agglomeration of aluminum oxide and ruthenium oxide is utilized, ruthenium particles are formed under the temperature condition, and the bonding fastness is greatly improved.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a mesoporous ruthenium-aluminum catalyst. Background technique [0002] Cyclohexene is an important chemical intermediate, because of its active C=C double bond, it is an important organic chemical raw material for the production of fine chemicals such as cyclohexanol, adipic acid, polyamide and polyester. [0003] Compared with the traditional technology of fully hydrogenating benzene to prepare cyclohexene, the selective hydrogenation of benzene to prepare cyclohexene avoids the step of cyclohexane oxidation, and fundamentally eliminates potential safety hazards in the production process. At present, the catalyst system of the benzene selective hydrogenation technology is basically a metal ruthenium catalyst system supported by metal oxides. Among them, alumina is a commonly used carrier, and in the preparation process, porous alumina is directly us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J35/02B01J35/10C07C5/11C07C13/20
CPCB01J23/462C07C5/11C07C2601/16C07C2523/46B01J35/40B01J35/60C07C13/20Y02P20/52
Inventor 许萌方标柯军梁
Owner 浙江工业大学上虞研究院有限公司