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Preparation method of CuO-CeO2 supported catalyst and application of CuO-CeO2 supported catalyst in anaerobic elimination of NOx and CO in tail gas

A supported catalyst and precipitant technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of complex catalyst composition and achieve good selectivity , the effect of high low temperature activity and large reaction window

Inactive Publication Date: 2021-05-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN102941088B proposes a catalyst preparation method for simultaneously eliminating CO, CH, NOx, and PM, but the catalyst components are complicated and precious metals are used
The dispersion of the active component CuO, the oxygen storage and release capacity of the support, and the interaction between the active component and the support affect the final catalytic effect, and it is also a problem that the above-mentioned catalysts are difficult to balance the three.

Method used

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  • Preparation method of CuO-CeO2 supported catalyst and application of CuO-CeO2 supported catalyst in anaerobic elimination of NOx and CO in tail gas
  • Preparation method of CuO-CeO2 supported catalyst and application of CuO-CeO2 supported catalyst in anaerobic elimination of NOx and CO in tail gas

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Experimental program
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Effect test

Embodiment 1

[0037](1) Form a mixed solution with cerium nitrate and sodium carbonate according to the quality of 1g and 3g, then place the mixed solution in a reaction kettle and transfer it into an oven, set the temperature range of the oven to 120°C, keep it for 10h, and wait for the temperature to drop to At room temperature, the resulting white suspension was filtered, washed, and dried to obtain a white cerium oxide powder (carrier).

[0038] (2) 1gCeO obtained in (1) 2 The white powder was dispersed in the aqueous solution, and then 0.1 g of copper nitrate was added thereto. The precipitating agent is the same as (1), put the mixed solution in a 70°C water bath, keep stirring at a constant temperature for 2 hours, then filter the mixed solution after the water bath, wash, and dry to obtain 10% CuO-90% CeO 2 .

[0039] (3) Take the material from (2) and place it in a muffle furnace for calcination for 2 hours at a calcination temperature of 200°C. Finally get 10%CuO-90%CeO 2 , re...

Embodiment 2

[0043] (1) Form a mixed solution with cerium nitrate and sodium bicarbonate according to the quality of 1g and 3g, then place the mixed solution in a reaction kettle and transfer it into an oven, set the temperature range of the oven to 120°C, keep it for 10h, and wait for the temperature to reach room temperature, the resulting white suspension was filtered, washed, and dried to obtain a white cerium oxide powder (carrier).

[0044] (2) 1gCeO obtained in (1) 2 The white powder was dispersed in the aqueous solution, and 1 g of copper nitrate was added thereto. The precipitating agent is the same as (1), put the mixed solution in a 70°C water bath, keep stirring at a constant temperature for 2 hours, then filter the mixed solution after the water bath, wash, and dry to obtain 50%CuO-50%CeO 2 .

[0045] The material in (2) was calcined in a muffle furnace for 2 hours at a calcination temperature of 250°C. Finally get 50%CuO-50%CeO 2 , Record as CuCe-2.

Embodiment 3

[0047] Cerium nitrate and potassium carbonate are mixed according to the quality of 1g and 3g, and then the mixed solution is placed in the reaction kettle and transferred into the oven. The temperature range of the oven is set at 120°C and kept for 10h. The resulting white suspension was filtered, washed and dried to obtain a white cerium oxide powder (support).

[0048] 1gCeO obtained by (1) 2 The white powder was dispersed in the aqueous solution, and then 4 g of copper nitrate was added thereto. The precipitating agent is the same as (1), put the mixed solution in a 70°C water bath, keep stirring at a constant temperature for 2 hours, then filter the mixed solution after the water bath, wash, and dry to obtain 80%CuO-20%CeO 2 .

[0049] The material in (2) was calcined in a muffle furnace for 2 hours at a calcination temperature of 300°C. Finally get 80%CuO-20%CeO 2 , Record as CuCe-3.

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Abstract

The invention discloses a preparation method of a CuO-CeO2 supported catalyst and application of the CuO-CeO2 supported catalyst in anaerobic elimination of NO and CO in tail gas. Uniform loading of nano-particles with the size of 3-7 nm is successfully realized by using a hydrothermal synthesis and chemical deposition method, an ultra-stable CuO-CeO2 catalyst is formed, and then the research on reduction conversion of CO to NO under an anaerobic condition is carried out by using the nano-loaded catalyst. Compared with the prior art, the catalyst is extremely high in catalytic activity, strong in thermal stability, high in pollution gas conversion rate, applicable to industrial production, simple in preparation method and easy to operate, can eliminate two main automobile exhaust pollutants at the same time, and shows an extremely strong industrial application prospect.

Description

technical field [0001] The invention belongs to CO and NO in motor vehicle tail gas x The field of environmental protection elimination, specifically related to a nano-CuO-CeO 2 Preparation method of supported catalyst and CO to NO under anaerobic conditions x The application of the reduction transformation. Background technique [0002] The combustion of fossil fuels emits a large amount of nitrogen oxides while satisfying the rapid development of modern industry. The nitrogen oxides that pollute the air are mainly NO and NO 2 exists, use NO x express. Under high temperature combustion conditions, NO x Mainly exists in the form of NO, the initial NO emitted x NO accounts for about 95% of the total. However, NO can easily react with oxygen in the air in the atmosphere to form NO 2 , so NO in the atmosphere x NO 2 form exists. NO and NO in the air 2 Through photochemical reactions, mutual conversion and balance. When the temperature is high or there are clouds an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/03B01J37/08B01J35/10B01D53/94B01D53/56B01D53/62
CPCB01J23/83B01J37/031B01J37/08B01J37/082B01J23/002B01D53/945B01J35/23B01J35/613B01J35/643B01J35/647B01J35/615Y02A50/20
Inventor 郭嵩李杲张佳张少阳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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