Nanometer copper-cerium composite oxide catalyst, and preparation method and application thereof

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem that composite oxide particles become larger and cannot prepare nano copper Problems such as cerium composite oxide catalysts, difficulty in obtaining mixed nanocomposite oxide catalysts, etc.

Active Publication Date: 2016-05-04
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to obtain a homogeneously mixed nanocomposite oxide catalyst. The results of the literature show that the sample calcined at 300 ° C has nanoparticles, and the decomposition temperature of copper nitrate and iron nitrate is 350-450 ° C
However, after increasing the calcination temperature, the particles of the composite oxide become larger and the activity decreases.
Therefore adopt the method similar to this document to also can't prepare the nano-copper cerium composite oxide catalyst that can be used for the circulation gas purification in the glyoxal production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Cu(NO 3 ) 2 ?3H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 Add absolute ethanol dropwise to the mixed salt until it is completely dissolved, and then continue to stir for 10 minutes, then add propylene oxide to the solution, and the molar ratio of propylene oxide to the metal salt is 15. Gel formed after about 5 minutes;

[0022] (2) The obtained gel was aged at room temperature for 24 hours, dried at 78-79°C for 12 hours, and then treated at 450°C under nitrogen flow for 40 hours;

[0023] (3) Cool down to 400°C, add 5% air in the inert gas flow, increase the air volume to 10% after 2 hours of treatment, increase the air volume to 50% after another two hours, and switch the air flow to Air, and continued to process for 24 hours to obtain nano-copper-cerium composite oxide catalyst A.

[0024] Catalyst A is applied to the reaction of recycling gas purification for the production of glyoxal by air oxidation of ethylene glycol, and the volatile organic compounds in the rec...

Embodiment 2

[0026] (1) Cu(CH 3 COO) 2 ?H 2 O and Ce(NO 3 ) 3 ?6H 2 Add absolute ethanol dropwise to the O mixed salt until completely dissolved, and continue stirring for 15 minutes, then add propylene oxide to the solution, and the molar ratio of propylene oxide to the metal salt is 20. Gel formed after about 5 minutes;

[0027] (2) The obtained gel was aged at room temperature for 30 hours, dried at 78-79°C for 24 hours, and then treated at 400°C under argon flow for 50 hours;

[0028] (3) Same as in Embodiment 1, to obtain nano-copper-cerium composite oxide catalyst B.

[0029] Catalyst B is applied to the reaction of recycling gas purification for the production of glyoxal by air oxidation of ethylene glycol, and the volatile organic compounds in the recycling gas are completely oxidized into carbon dioxide.

Embodiment 3

[0031] (1) Cu(NO 3 ) 2 ?3H 2 O and Ce(CH 3 COO) 3 ?nH 2 Add absolute ethanol dropwise to the O mixed salt until completely dissolved, continue to stir for 12 minutes, then add propylene oxide in the solution, the molar ratio of propylene oxide and metal salt is 18. Gel formed after about 5 minutes;

[0032] (2) The obtained gel was aged at room temperature for 24 hours, dried at 78-79°C for 12 hours, and then treated at 450°C under helium flow for 48 hours;

[0033] (3) Same as in Embodiment 1, a nano-copper-cerium composite oxide catalyst C is obtained.

[0034] Catalyst C is applied to the purification reaction of the circulating gas produced by the air oxidation of ethylene glycol to produce glyoxal, and the volatile organic compounds in the circulating gas are completely oxidized into carbon dioxide.

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Abstract

The invention specifically relates to a nanometer copper-cerium composite oxide catalyst, and a preparation method and application thereof, belonging to the technical field of chemical catalysts. The invention provides application application the nanometer copper-cerium composite oxide catalyst in purification of circulation gas during production of glyoxal through atmospheric oxidation of glycol. According to the invention, nitrates or acetates of copper and cerium are mixed and then dissolved in absolute ethyl alcohol; then epoxypropane is added so as to form gel; and then heat treatment is carried out in an inert atmosphere and air atmosphere respectively so as to prepare the nanometer copper-cerium composite oxide catalyst. The catalyst prepared in the invention has good activity and stability and can be used for purification of circulation gas during production of glyoxal through atmospheric oxidation of glycol; and under the working conditions of production of glyoxal through atmospheric oxidation of glycol, the catalyst allows organic matters in the circulation gas to be completely oxidized, so the purpose of purifying the circulation gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to a nano-copper-cerium composite oxide and a preparation method and application thereof. Application in the purification of circulating gas in the production of glyoxal by air oxidation of ethylene glycol. Background technique [0002] Glyoxal has important uses in many industries such as textiles, pharmaceuticals, microelectronics, and aerospace. Its mainstream production method is to use an adiabatic bed reactor, and ethylene glycol and air are carried out at 400-600 ° C on silver or silver-copper catalysts. Partial oxidation reaction of ethylene glycol, the product is absorbed by water to obtain a glyoxal aqueous solution product with a weight solubility of 40%. The reaction of partial oxidation of ethylene glycol to form glyoxal is a strong exothermic reaction. In order to maintain a stable reaction temperature, part of the nitrogen in the product gas af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83F23G7/07
CPCB01J23/83F23G7/07F23G2209/14
Inventor 沈伟徐华龙秦枫庄思爽尹国平邓支华汪林涛付义发周拥军
Owner FUDAN UNIV
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