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Preparation method and application of cerium-zirconium composite oxide catalyst loaded with copper oxide

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 problems of long consumption time, cumbersome catalyst process, low-temperature oxidation of CO Low activity and other problems, to achieve the effect of simple preparation process, high anti-sintering ability and thermal stability, and short working hours

Inactive Publication Date: 2012-05-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to prepare CuO / Ce in order to overcome prior art x Zr 1-x o 2 Disadvantages such as cumbersome catalyst process, long consumption time, or low activity for low-temperature oxidation of CO

Method used

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  • Preparation method and application of cerium-zirconium composite oxide catalyst loaded with copper oxide
  • Preparation method and application of cerium-zirconium composite oxide catalyst loaded with copper oxide
  • Preparation method and application of cerium-zirconium composite oxide catalyst loaded with copper oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 5.211g Ce(NO 3 ) 3 ·6H 2 O, 5.1506g Zr(NO 3 ) 4 ·5H 2 O and 0.1183g Cu(NO 3 ) 2 ·3H 2 O was dissolved in 200mL deionized water, and added dropwise to 100mL ammonia solution with a mass fraction of 5%-8% at a rate of 0.8-1.2mL / min under stirring at 600-900r / min. After the dropwise addition was completed, stirring was continued for 1 h. Carry out microwave heating and reflux at a stirring speed of 700-900 r / min, and stop heating until pH=6-7. Filter the mixture when it is cooled to 80-90°C, and wash the filter cake twice with absolute ethanol that is 2 to 3 times the mass of the filter cake. The filter cake was heated and dried in a microwave oven, and baked in a muffle furnace at 600° C. for 2 hours to prepare catalyst A, in which the content of CuO in the catalyst was 2%.

Embodiment 2

[0028] 3.9083g Ce(NO 3 ) 3 ·6H 2 O, 2.5753g Zr(NO 3 ) 4 ·5H 2 O and 0.4027g Cu(NO 3 ) 2 ·3H 2O was dissolved in 150 mL of deionized water, and added dropwise to 70 mL of ammonia solution with a mass fraction of 5% to 8% at a rate of 0.8 to 1.2 mL / min under stirring at 600 to 900 r / min. After the dropwise addition was completed, stirring was continued for 1 h. Carry out microwave heating and reflux at a stirring speed of 700-900 r / min, stop heating until pH=6-7. Filter the mixture when it is cooled to 80-90°C, and wash the filter cake twice with absolute ethanol that is 2 to 3 times the mass of the filter cake. The filter cake was heated and dried in a microwave oven, and baked in a muffle furnace at 600° C. for 2 hours to prepare catalyst B, in which the content of CuO in the catalyst was 10%.

Embodiment 3

[0030] 3.9083g Ce(NO 3 ) 3 ·6H 2 O, 2.5753g Zr(NO 3 ) 4 ·5H 2 O and 0.906g Cu(NO 3 ) 2 ·3H 2 O was dissolved in 160 mL of deionized water, and added dropwise to 100 mL of ammonia solution with a mass fraction of 5% to 8% at a rate of 0.8 to 1.2 mL / min under stirring at 600 to 900 r / min. After the dropwise addition was completed, stirring was continued for 1 h. Carry out microwave heating and reflux at a stirring speed of 700-900 r / min, and stop heating until pH=6-7. Filter the mixture when it is cooled to 80-90°C, and wash the filter cake twice with absolute ethanol that is 2 to 3 times the mass of the filter cake. The filter cake was heated and dried in a microwave oven, and then calcined in a muffle furnace at 600° C. for 2 hours to prepare catalyst C. The content of CuO in the catalyst was 20%.

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Abstract

The invention discloses a preparation method and application of cerium-zirconium composite oxide catalyst loaded with copper oxide. The preparation method comprises the following steps of: dissolving Cu salt, Ce salt and Zr salt in deionized water, slowly and dropwise adding the deionized water into dilute ammonia water, heating by microwave, depositing, filtering, washing, drying by microwave and baking at high temperature to obtain the cerium-zirconium composite oxide catalyst loaded with copper oxide. Compared with the preparation method of traditional catalysts, the preparation method of the catalyst has the advantages that the preparation process is simple, the working hour is short, and CuO as an active component is highly dispersed on the surface of a carrier. The catalyst preparedby using the preparation method has very high anti-sintering capability and heat stability and has higher activity for CO catalytic oxidation reaction.

Description

technical field [0001] The invention relates to a preparation method and application of a highly active cerium-zirconium composite oxide catalyst loaded with copper oxide. Background technique [0002] CeO 2 It is an important rare earth oxide in industrial catalysis. Its most important role is to act as a buffer for oxygen in the oscillating atmosphere that is constantly changing from rich to lean. Through the oxidation state of CeO 2 and reduced Ce 2 o 3 The transformation between strengthens the oxygen storage and release capacity of the material. It can be used for automobile exhaust purification treatment, hydrogen production by steam reforming of alcohols, water gas conversion reaction, CO poisoning protection, tobacco harm reduction and CO removal in closed systems and other reactions. [0003] But at high temperature pure CeO 2 Sintering and particle growth are easy to occur. The study found that the addition of Zr can effectively prevent the CeO 2 The sinteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/72B01D53/86B01D53/62
CPCY02A50/20
Inventor 杨志强毛东森金东元卢冠忠
Owner SHANGHAI INST OF TECH