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High-dispersion supported copper-based catalyst as well as preparation method and application thereof

A copper-based catalyst, supported technology, applied in the preparation of hydroxyl compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the adjustment of mixing uniformity and fineness, uneven composition and structure, affecting composite metal oxides performance and other problems, to achieve the effect of improving dispersibility, overcoming uneven mixing, and good catalytic hydrogenation performance

Inactive Publication Date: 2013-09-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the above synthesis method still uses the mixture as the raw material of the roasted precursor, the mixing uniformity and fineness of the roasted precursor cannot be adjusted to a large extent from the microscopic level, resulting in the inhomogeneous composition and structure of the product, which affects to the properties of composite metal oxides

Method used

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  • High-dispersion supported copper-based catalyst as well as preparation method and application thereof
  • High-dispersion supported copper-based catalyst as well as preparation method and application thereof
  • High-dispersion supported copper-based catalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0022] Accurately weigh Cu(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Zr(NO 3 ) 4 9H 2 O, prepare mixed salt solution with deionized water, Cu in the solution 2+ The molar concentration of Zn is 0.06mol / L, Zn 2+ The molar concentration is 0.06mol / L, Zr 4+ The molar concentration is 0.06mol / L. Dissolve sodium hydroxide, sodium carbonate and cetyltrimethylammonium bromide in deionized water to prepare a mixed alkaline solution, wherein the molar concentration of sodium hydroxide is 0.25mol / L, and the molar concentration of sodium salt is 0.12mol / L , the concentration of cetyltrimethylammonium bromide is 0.09mol / L. Pour 100ml of the mixed salt solution and 100ml of the mixed alkaline solution into the fully back-mixed liquid membrane reactor at the same time, stir at a speed of 6000 rpm for 2 minutes, and then add it together with 100ml of water into a 500ml single-necked flask for crystallization at 60°C for 12 hours. Then centrifuge and wash 5 times with hot deionize...

Embodiment 2

[0025] Accurately weigh Cu(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Zr(NO 3 ) 4 9H 2 O, prepare mixed salt solution with deionized water, Cu in the solution 2+ The molar concentration is 0.06mol / L, Mg 2+ The molar concentration is 0.06mol / L, Zr 4+ The molar concentration is 0.03mol / L. Dissolve sodium hydroxide, sodium carbonate and polyvinylpyrrolidone in deionized water to prepare a mixed alkaline solution, wherein the molar concentration of sodium hydroxide is 0.30mol / L, the molar concentration of sodium salt is 0.06mol / L, and the concentration of polyvinylpyrrolidone is 0.06 mol / L. Pour 100ml of the mixed salt solution and 100ml of the mixed alkaline solution into the fully back-mixed liquid membrane reactor at the same time, stir at a speed of 3000 rpm for 2 minutes, and then add it together with 100ml of water into a 500ml one-mouth bottle for crystallization at 60°C for 12 hours. Then centrifuge and wash 5 times with hot deionized water until the pH reaches ...

Embodiment 3

[0028] Accurately weigh Cu(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Zr(NO 3 ) 4 9H 2 O, prepare mixed salt solution with deionized water, Cu in the solution 2+ The molar concentration is 0.06mol / L, Co 2+ The molar concentration is 0.06mol / L, Zr 4+ The molar concentration is 0.09mol / L. Dissolve sodium hydroxide, sodium carbonate and sodium lauryl sulfate in deionized water to prepare a mixed alkaline solution, wherein the molar concentration of sodium hydroxide is 0.48mol / L, the molar concentration of sodium salt is 0.18mol / L, and dodecane The sodium base sulfate concentration is 0.03mol / L. Pour 100ml of the mixed salt solution and 100ml of the mixed alkaline solution into the fully back-mixed liquid membrane reactor at the same time, stir at a speed of 5000 rpm for 2 minutes, and then add it together with 100ml of water into a 500ml single-necked flask for crystallization at 60°C for 12 hours. Then use hot deionized water to centrifuge and wash 5 times until the p...

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Abstract

The invention provides a high-dispersion supported copper-based catalyst as well as a preparation method and an application thereof. The catalyst can be represented as Cu / MO-ZrO2, wherein copper nanoparticles are uniformly dispersed on a compound metal oxide carrier, the specific surface area of the catalyst is between 60-110m<2> / g, the weight ratio of Cu is 10-40%, and the grain size of Cu is 5-20nm. Precursor nanoparticles of a compound metal hydroxide catalyst uniformly dispersed in molecular level and adjustable in constitution and structure are synthesized by the method by means of a forced micromixing effect caused by a strong shear force, a centrifugal force and a counter-acting force of an all-backmixing liquid film reactor, and a selective guide effect of a surfactant. The catalyst precursor is roasted and reduced to obtain the high-dispersion supported copper-based catalyst. The catalyst is mainly used for selective catalytic hydrogenation of dimethyl oxalate, and the conversion ratio and the selectivity respectively reach 90-100% and 85-95%. The copper-based catalyst has the characteristics of good stability and simple preparation method.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a preparation method of a highly dispersed copper-based metal catalyst and the use of the catalyst in the catalytic hydrogenation reaction of dimethyl oxalate. technical background [0002] Ethylene glycol is an important basic chemical raw material, which can be used to produce polyester resin, polyester fiber, polyester plastic, etc. Ethylene glycol can also be directly used as antifreeze and engine coolant, ethylene glycol nitrate can be used as explosives, and is also indispensable for the production of plasticizers, paints, adhesives, surfactants, capacitors and electrolytes additives. At present, the production process of ethylene glycol in the world mainly includes petrochemical route and carbon-chemical route. The petrochemical route includes the direct hydration method of ethylene oxide and the ethylene carbonate method, both of which use the petroleum pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/72B01J23/75B01J23/755C07C31/20C07C29/149
Inventor 李峰刘全遥张绍岩范国利
Owner BEIJING UNIV OF CHEM TECH
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