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Magnetic bifunctional catalyst, preparation method therefor and application of magnetic bifunctional catalyst in methanol catalyzed reaction

A bifunctional catalyst and catalyst technology, which are used in the preparation of carbonyl compounds by oxidation, the preparation of carboxylic acids by oxidation, and the preparation of organic compounds, can solve the problems of low methanol concentration, decreased reaction temperature, and poor control of gas-solid catalytic reaction temperature. , to achieve the effect of improving stability, improving activity, avoiding aggregation and loss

Active Publication Date: 2016-04-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, most of this catalytic reaction is a gas-solid reaction carried out in a fixed-bed reactor, and the concentration of methanol in the feed is relatively low, so a large amount of gas needs to be recycled during the reaction process.
In addition, the temperature of the gas-solid catalytic reaction is not easy to control, too high a reaction temperature will cause a decrease in selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 17.6g of FeCl 3 ·6H 2 O was dissolved in 82.4g of deionized water to make a solution, and 3.5g of sodium acetate was weighed and dissolved in 46.5g of ethylene glycol to make a solution, and was added dropwise at a water bath temperature of 30°C under stirring conditions 2 In the protected reactor, after the dropwise addition, the mixed solution was put into an autoclave, crystallized at 180°C for 8 hours, then cooled naturally, washed with deionized water and ethanol three times, and dried in vacuum at 60°C for 8 hours. The obtained magnetic Fe 3 o 4 particles.

[0027] (2) Weigh the obtained magnetic Fe 3 o 4 Add 10.6g of particles into 89.4g of ethanol to make liquid A; weigh 3.6g of Ti(SO 4 ) 2 Dissolve in 46.4g deionized water to make solution B; weigh 0.15g polyethylene glycol (PEG-1500) and dissolve in 49.85g ethanol to make solution C. Under the condition of stirring at 40°C, add liquid B and liquid C to liquid A at the same time. After the dro...

Embodiment 2

[0031] (1) Weigh 17.6g of FeCl 3 ·6H 2 O was dissolved in 82.4g of deionized water to make a solution, and 3.5g of sodium acetate was weighed and dissolved in 46.5g of ethylene glycol to make a solution, and was added dropwise at a water bath temperature of 30°C under stirring conditions2 In the protected reactor, after the dropwise addition, the mixed solution was put into an autoclave, crystallized at 180°C for 8 hours, then cooled naturally, washed with deionized water and ethanol three times, and dried in vacuum at 60°C for 8 hours. The obtained magnetic Fe 3 o 4 particles.

[0032] (2) Weigh the obtained magnetic Fe 3 o 4 Add 10.6g of particles into 89.4g of ethanol to make liquid A; weigh 4.8g of Ti(SO 4 ) 2 Dissolve in 45.2g deionized water to make solution B; weigh 0.2g polyethylene glycol (PEG-1500) and dissolve in 49.8g ethanol to make solution C. Under the condition of stirring at 40°C, add liquid B and liquid C to liquid A at the same time. After the dropwis...

Embodiment 3

[0036] (1) Weigh 21.6g of FeCl 3 ·6H 2 O was dissolved in 78.4g of deionized water to make a solution, and 4.3g of sodium acetate was weighed and dissolved in 45.7g of ethylene glycol to make a solution, which was added dropwise at the temperature of a water bath at 30°C under stirring conditions. 2 In the protected reactor, after the dropwise addition, the mixed solution was put into an autoclave, crystallized at 180°C for 8 hours, then cooled naturally, washed with deionized water and ethanol three times, and dried in vacuum at 60°C for 8 hours. The obtained magnetic Fe 3 o 4 particles.

[0037] (2) Weigh the obtained magnetic Fe 3 o 4 Add 15.0g of granules to 85.0g of ethanol to make liquid A; weigh 6.5g of Ti(SO 4 ) 2 Dissolve in 43.5g deionized water to make solution B; weigh 0.25g polyethylene glycol (PEG-1500) and dissolve in 49.75g ethanol to make solution C. Under the condition of stirring at 40°C, add liquid B and liquid C to liquid A at the same time. After ...

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Abstract

The invention relates to a magnetic bifunctional catalyst, a preparation method therefor and application of the magnetic bifunctional catalyst in a methanol catalyzed reaction and belongs to the technical field of magnetic bifunctional catalysts and fine chemical industry. According to the magnetic bifunctional catalyst, the surface of each magnetic Fe3O4 core is coated with a TiO2 shell layer with a mesoporous structure, and mesopore of each TiO2 shell layer are loaded with catalytic active components such as Pd, Au and Pd-Au. The method comprises the steps: preparing Fe3O4 cores with super paramagnetism; then, coating the surface of each magnetic Fe3O4 core with the TiO2 shell layer with the mesoporous structure by an ultrasonic-hydrothermal method in a manner of taking titanium sulfate, titanyl sulfate and the like as a titanium source and taking polyethylene glycol as a template agent, so as to prepare magnetic TiO2@Fe3O4 nanospheres; and finally, loading the catalytic active components such as Pd, Au and Pd-Au into the mesopore of each TiO2 shell layer. The magnetic bifunctional catalyst has very good methanol conversion ratio and overall selectivity of methylal and methyl formate, and the reacted catalyst can be separated and recovered by an external magnetic field.

Description

technical field [0001] The invention relates to a magnetic bifunctional catalyst, its preparation and its use in methanol liquid-phase catalytic reaction, and belongs to the technical fields of magnetic bifunctional catalyst and fine chemical industry. Background technique [0002] Methanol is an important basic chemical raw material. With the overcapacity of methanol, it is of great significance to develop downstream products of methanol with high added value. Among the many methanol downstream products, methylal (chemical name is dimethoxymethane) and methyl formate are high value-added methanol downstream green chemical products that have attracted much attention. Methylal has low toxicity, low boiling point, and good solubility. It has been widely used in the fields of medicine, cosmetics, and automobiles. It can replace toxic solvents such as benzene and toluene. When added as a diesel additive, methylal can effectively improve the engine. Excellent combustion performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C41/56C07C43/30C07C67/08C07C69/06C07C45/29C07C47/055C07C51/16C07C53/02
CPCC07C41/56C07C45/29C07C51/16C07C67/08B01J23/8906B01J35/33C07C43/30C07C69/06C07C47/04C07C53/02
Inventor 季生福高腾飞刘焕君刘健
Owner BEIJING UNIV OF CHEM TECH
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