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Supported tungsten-gallium polyoxometallate catalyst and preparation method and application thereof

A polyoxometalate and supported technology, applied in the direction of catalyst activation/preparation, catalytic reaction, chemical instruments and methods, etc., can solve the problems of small catalyst particles, difficult to recycle, restrict the application range of catalysts, etc., and achieve high conversion rate and selective effects

Active Publication Date: 2016-06-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical catalytic applications, POMs also have shortcomings such as small catalyst particles, difficulty in recycling, and low utilization efficiency, which not only restricts the application range of catalysts, but also increases their economic costs in industrial catalytic applications.

Method used

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  • Supported tungsten-gallium polyoxometallate catalyst and preparation method and application thereof
  • Supported tungsten-gallium polyoxometallate catalyst and preparation method and application thereof
  • Supported tungsten-gallium polyoxometallate catalyst and preparation method and application thereof

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preparation example Construction

[0029] The preparation method of described loaded tungsten gallium polyoxometalate catalyst comprises the steps:

[0030] 1) Add 36.3gNa 2 WO 4 2H 2 O was dissolved in 60mL deionized water to form a solution with a concentration of 1.8mol / L, then 6g of acetic acid with a concentration of 0.1mol / L was added and heated to boiling;

[0031] 2) Prepare 1mol / L Ga(NO 3 ) 3 solution;

[0032] 3) Under the condition of electromagnetic stirring, take 10mL of the Ga(NO 3 ) 3 The solution was dropped into the solution obtained in step 1) dropwise, stirred for 30 minutes, and the pH of the solution was adjusted to a final pH of 8.5;

[0033] 4) 20g of solid sodium acetate is gradually added in batches to the solution obtained in step 3), and cooled to room temperature to obtain GaW 11 mixture;

[0034] 5) Filter the GaW obtained in step 4) 11 mixture, and the resulting solid was washed several times with methanol and dried; GaW 11 The XRD pattern of figure 2 (Part a);

[003...

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Abstract

The invention discloses a supported tungsten-gallium polyoxometallate catalyst and a preparation method and application thereof.Keggin type tungsten-gallium polyoxometallate is fixed to the surface of porous silicon dioxide successfully by grafting APTES on the surface of the porous silicon dioxide with the nanometer scale pore diameter, and the novel supported tungsten-gallium polyoxometallate catalyst is obtained.According to the catalyst, molecular oxygen can be used as an oxidizing agent, and the high conversion rate and good selectivity can be obtained when the catalyst is used for epoxidation reaction of cyclohexene on the solvent-free condition.

Description

technical field [0001] The invention relates to a supported tungsten-gallium polyoxometalate catalyst, a preparation method and application thereof. Background technique [0002] Epoxides are a class of fine chemical raw materials and pharmaceutical intermediates with a wide range of uses. The most important way to form epoxides is the epoxidation of olefins. Epoxidation plays an important role in both organic synthesis and chemical industry. Therefore, the research on olefin epoxidation has always been a hot spot in the chemical industry. [0003] In recent years, polyoxometalates (POMs) have developed rapidly, and their structural types have far exceeded the traditional classical structures such as Keggin and Dawson, and their constituent elements have also expanded from abundant elements such as Mo, W, and V. to cover more than 70 elements in the periodic table. With the continuous update of polyoxometalate synthesis methods, a batch of POMs with novel structures and si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/34C07D301/08C07D303/04
CPCC07D301/08C07D303/04B01J27/188B01J31/34B01J37/0203B01J2231/72B01J35/647
Inventor 朱明乔乌莎贾米尔陈亨权陈新志刘懿童张法
Owner ZHEJIANG UNIV
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