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CoMn2O4 bimetallic oxide catalyst and preparation method and application

A bimetallic oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The problem of catalyst falling off or dissolution can achieve the effect of low synthesis cost, good stability and improved selectivity.

Active Publication Date: 2019-06-28
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the highest styrene conversion rate of the catalyst is only 38.2%, and the highest selectivity of styrene oxide is only 57.3%.
In addition, in order to further improve the performance of the catalytic reaction, it is usually necessary to introduce noble metals ( Nano Research , 2016, 9, 1182–1192; RSC Advances , 2015, 5, 37610–37616; Journal of Molecular CatalysisA: chemical , 2016, 413, 67–76), on the one hand, this increases the cost of catalyst preparation; on the other hand, the noble metal catalyst is easy to fall off or dissolve from the surface of the support, which also affects its stability

Method used

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  • CoMn2O4 bimetallic oxide catalyst and preparation method and application
  • CoMn2O4 bimetallic oxide catalyst and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.73 g of cobalt nitrate hexahydrate and 1.26 g of manganese nitrate tetrahydrate and dissolve them in 40 mL of ethylene glycol and stir evenly. Add 20 mmol of urea as a precipitant to the mixture, stir it with magnetic force to make it fully mixed, and transfer the solution to In a hydrothermal reaction kettle, hydrothermal crystallization was carried out at 180 °C for 12 h. After the reaction was completed, it was cooled to room temperature. Calcined at 600 °C for 3 h in a Furnace to obtain CoMn 2 o 4 Bimetallic oxide catalysts.

[0031] 0.1 g of the catalyst was used for the selective oxidation of styrene. The reaction used tert-butyl hydroperoxide as the oxidant and acetonitrile as the solvent, and reacted at 80 °C for 6 h. The product was analyzed by gas chromatography. It was found that the conversion rate of styrene reached 97.7%, and the selectivity of styrene oxide reached 83.7%. %.

[0032] figure 1 For the prepared CoMn 2 o 4 X-ray diffraction p...

Embodiment 2

[0035] Repeat Example 1, except that the amount of urea used to prepare the catalyst is 25 mmol. The obtained catalyst was used in the oxidation reaction of styrene, and it was found that the conversion rate of styrene reached 90.9%, and the selectivity of styrene oxide reached 76.4%.

Embodiment 3

[0037] Example 1 was repeated, except that the calcination temperature used to prepare the catalyst was 500°C. The obtained catalyst was used in the oxidation reaction of styrene, and it was found that the conversion rate of styrene reached 99.2%, and the selectivity of styrene oxide reached 56.8%.

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Abstract

The invention discloses a CoMn2O4 bimetallic oxide catalyst and a preparation method and application. The CoMn2O4 bimetallic oxide catalyst is prepared through a simple and feasible hydrothermal crystallization method, and is applied to a reaction for preparing styrene oxide through styrene selective oxidation. The catalyst is simple in preparation process, low in synthesis cost, high in catalyticactivity and good in stability and can be recycled so that the styrene conversion rate and the selectivity of a target product, namely, styrene oxide, can be remarkably improved.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and application, and belongs to the technical field of organic catalyst preparation. Background technique [0002] Styrene oxide is an important chemical raw material, which is widely used in the synthesis of fine chemicals, pharmaceuticals, dyes, spices, pesticides and other industries. For example, β-phenylethanol produced by hydrogenation of styrene oxide is the main component of rose oil, clove oil and neroli oil, and is widely used in the preparation of food, tobacco, soap and cosmetic essence. [0003] In recent years, the method of selectively preparing styrene oxide with styrene as raw material under the action of a specific oxidant has the advantages of mild reaction conditions, simple process flow and environmental friendliness. Catalysts for the oxidation of styrene mainly include heteropolyacid catalysts, molecular sieve catalysts, metal-organic complex catalysts, metal catalysts, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07D301/19C07D303/04
Inventor 刘江永孟茹王理霞菅盘铭
Owner YANGZHOU UNIV
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