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Catalyst for removing NOx in incineration gas and preparation method thereof

A technology for incinerating flue gas and catalysts, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of low operating temperature, high cost of precious metal catalysts, and difficulty in popularization and application, and meet equipment requirements. Low, strong anti-toxic ability, easy to prepare and operate

Active Publication Date: 2010-07-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Loading these precious metals on Al 2 o 3 Catalysts prepared on different supports in NO X It shows high activity in the selective reduction process, and the use temperature is low (less than 300 ° C), but it is difficult to popularize and apply due to the high cost of noble metal catalysts

Method used

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  • Catalyst for removing NOx in incineration gas and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Ultrasonic disperse 0.5g carbon nanotubes (CNTs) and 0.05g hexadecyltrimethylammonium bromide in ethanol and oscillate ultrasonically to obtain liquid A; dissolve 40ml butyl orthotitanate in 60ml ethanol, then add 9ml of hydrolysis inhibitor acetic acid, and ultrasonically oscillate to obtain liquid B; under the condition of ultrasonic oscillation, dissolve 2.5g of manganese acetate and 1g of cerium nitrate in 20ml of ethanol, then add 8ml of deionized water to obtain liquid C; slowly pour out liquid A Pour into solution B, sonicate for 30 minutes, then pour into solution C, and continue to sonicate until a sol is formed. After the sol was aged at room temperature for 24 hours, it was dried at 80°C, calcined at 500°C for 4 hours under the protection of nitrogen, cooled, and ground to obtain the catalyst. Its energy spectrum is as follows figure 1 As shown, calculated from the corresponding peak areas in the figure: MnO with 7.5wt% CNTs, 9wt% Mn, and 4.5wt% Ce x -CeO 2...

Embodiment 2

[0031] Ultrasonic disperse 0.5g carbon nanotubes (CNTs) and 0.05g hexadecyltrimethylammonium bromide in ethanol, and ultrasonically oscillate to obtain liquid A; dissolve 40ml butyl orthotitanate in 60ml ethanol, and then add 9ml of hydrolysis inhibitor acetic acid was ultrasonicated to obtain liquid B; 2.5g of manganese acetate and 1g of cerium nitrate were dissolved in 20ml of ethanol, and then 10ml of deionized water was added to obtain liquid C. Slowly pour liquid A into liquid B, sonicate for 30 minutes, then pour into liquid C, transfer the mixed solution to a stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, and react at 230°C and a pressure of 45Mpa 3 hours. After suction filtration and washing, dry at 60°C, calcinate at 450°C for 4h under the protection of nitrogen, cool, and grind to obtain MnO with about 7.7wt% CNTs, about 8.8wt% Mn, and about 4.2wt% Ce x -CeO 2 / TiO 2 - CNTs catalyst.

[0032] Get 8ml of the catalyst of the pres...

Embodiment 3

[0034] Ultrasonic dispersion of 0.5g of carbon nanotubes CNTs in water, ultrasonic oscillation, to obtain liquid A; under the condition of ultrasonic oscillation, 2.5g of manganese acetate, 1g of cerium nitrate, 3.2g of titanium sulfate were dissolved in 20ml of ethanol, and then 40ml of deionized water to obtain solution B; under the condition of ultrasonic oscillation, mix the two solutions of A and B, and then add ammonia water dropwise until no precipitation is formed. After suction filtration and washing, dry at 80°C, calcinate at 480°C for 6h under the protection of nitrogen, cool, and grind to obtain MnO with about 7.7wt% CNTs, about 9.5wt% Mn, and about 4.1wt% Ce x -CeO 2 / TiO 2 - CNTs catalyst.

[0035] Get 8ml of the catalyst of the present invention, add 20wt% bentonite and an appropriate amount of water to stir, apply it on the above-mentioned aluminum sheets, insert ten pieces of aluminum sheets into a fixed-bed reactor for catalytic testing, NO X and NH 3 Con...

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Abstract

The invention discloses catalyst for removing NOx in incineration gas. The catalyst takes carbon nano tubes and titanium dioxide as carriers and takes manganese oxide and cerium oxide as binary active ingredients. The preparation method can be a sol gel method, a solvothermal method or a coprecipitation method. The catalyst of the invention takes both the carbon nano tubes and the TiO2 as the carriers, the excellent adsorption property of CNTs and the large specific surface area are utilized, the advantages of the TiO2 as traditional carriers are combined and the nontoxic and pollution-free MnOx and CeOx as the binary active ingredients, so the absorption function of the CNTs and the catalytic action of the MnOx and CeOx cooperate with each other, the operating temperature of the selective catalytic reaction is reduced and the NOx removal rate can reach 99.5 percent under 125 DEG C. The catalyst can be used to remove NOx atmospheric pollutants emitted in the high-temperature processes of the coal-fired power plants, the metallurgical industry, the waste incineration and the like.

Description

technical field [0001] The invention relates to a method for removing diNOx emitted from high-temperature processes such as coal-fired power plants, metallurgical industries, and garbage incineration. X Catalysts and their preparation methods. Background technique [0002] my country is a developing country that mainly burns coal. With the rapid development of the economy, the environmental pollution caused by coal burning is becoming more and more serious, especially the NO in the flue gas of coal burning. X , the pollution of the atmosphere has become a problem that cannot be ignored. my country's thermal power plant boiler NO X The annual emissions increased from 1.207 million tons to 1.506 million tons in 1987 to 2.713 million tons to 3.007 million tons in 2000. According to the CHINA-MAP project funded by NASA, the pollutant emissions in 29 regions of China have been detected through the PAINS-ASIA model. The results show that if no control is carried out, NO X Chin...

Claims

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Application Information

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IPC IPC(8): B01J23/32B01J21/18B01J37/34B01J37/08B01J37/03B01J35/10B01D53/86B01D53/56
CPCY02A50/20
Inventor 樊孝玉田维杨杭生张孝彬
Owner ZHEJIANG UNIV
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