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Method for denitrifying NO by directly decomposing NO catalytically by using supported metal oxide catalyst

A catalyst and oxide technology, applied in the field of catalytic denitration, can solve the problems of complex process and low NO removal rate, and achieve the effects of simple process, low operating cost and low operating temperature

Active Publication Date: 2015-04-01
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of low NO removal rate and complicated process in the prior art, the present invention provides an economical and practical method for removing nitrogen oxides in exhaust gas with simple and easy process, high removal rate of nitrogen oxides Methods

Method used

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  • Method for denitrifying NO by directly decomposing NO catalytically by using supported metal oxide catalyst
  • Method for denitrifying NO by directly decomposing NO catalytically by using supported metal oxide catalyst
  • Method for denitrifying NO by directly decomposing NO catalytically by using supported metal oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0019] The supported metal oxide catalyst was prepared by equal volume impregnation method. First, activated alumina was calcined at 500°C for 2 hours to obtain Al 2 o 3 carrier. Then Al 2 o 3 The carrier was mixed with equal volumes of metal nitrate solutions of different concentrations, ultrasonicated for 0.5h at room temperature, and then impregnated for 24h. The obtained impregnation mixture was then dried at 100 °C for 6 h. Then calcined at 500°C for 2h to prepare a series of Al 2 o 3 supported metal oxide catalysts. The loads of metal oxides are shown in Table 1.

[0020] Table 1

[0021]

Embodiment 2 and comparative example 2

[0023] The method of the invention includes filling catalysts in the reaction tube of the microwave catalytic reactor device to form a microwave catalytic reaction bed, and the gas to be treated undergoes gas-solid phase reaction for denitration treatment when passing through the microwave catalytic reaction bed. The catalyst is the metal oxide prepared in Example 1 and Comparative Example 1 supported on Al 2 o 3 On the carrier, the composition is CuO x / Al 2 o 3 , MnO x / Al 2 o 3 , NiO x / Al 2 o 3 , CuMnO x / Al 2 o 3 , CeCuO x / Al 2 o 3 , CeMnO x / Al 2 o 3 , CeNiO x / Al 2 o 3 and CeCuMnO x / Al 2 o 3 Catalyst; the catalyst is filled in the reaction tube of the microwave catalytic reactor device, when the gas to be treated passes through the microwave catalytic reaction bed, the NO in the gas is directly decomposed and reacted to generate environmentally friendly N 2 and O 2 , in order to achieve the purpose of direct denitrification.

[0024]In this e...

Embodiment 3 and comparative example 3

[0032] It is basically the same as Example 2 and Comparative Example 2, except that the content of oxygen in the intake air is changed to 0-10%.

[0033] The loading amount of the catalyst in Example 3 and Comparative Example 3 is 1.5 g respectively, and the mesh size is 40-60 mesh. The intake NO concentration is 1000ppm, the oxygen content in the intake air is changed to 0%, 5%, 7.5%, 10%, the residence time of the gas in the microwave catalytic reaction bed is 1s, and the reaction pressure is normal pressure. The microwave power was adjusted to maintain the temperature of the catalyst bed at 250°C, and the oxidation resistance of the catalyst in the microwave catalytic decomposition of NO was investigated. The results are shown in Table 3.

[0034] table 3

[0035]

[0036] In the presence of oxygen, the conversion rate of NO is not affected by the oxygen concentration on each catalyst, indicating that the supported metal oxide catalysts in the comparative examples and ...

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Abstract

The invention provides a method for denitrifying NO by directly decomposing NO catalytically by using a supported metal oxide catalyst. The method is carried out in a microwave field. The catalyst is a supported mixed metal oxide catalyst which is characterized in that a mixed metal oxide MOx is supported on an Al2O3 carrier, wherein M is selected from two or three of cerium, copper, manganese and nickel; preferably, the catalyst is selected from CeCuOx / Al2O3, CeMnOx / Al2O3, CeNiOx / Al2O3 and CeCuMnOx / Al2O3. The method has the advantages that secondary pollution is avoided through microwave catalytic direct NO decomposition reaction; the process is simple, is convenient to operate and easy to control, is high in NO removal efficiency (the NO conversion rate can be 95.1%), strong in oxidation resistance and low in operating temperatures, is energy-saving and environment-friendly and is low in operating cost; the flue gases or waste gases treated by using the method can be directly up to the national emission standard.

Description

technical field [0001] The invention relates to the field of catalytic denitrification, in particular to a method for catalytically direct decomposition of NO and denitrification by a supported metal oxide catalyst. Background technique [0002] Nitrogen oxides are one of the main pollutants that seriously endanger human health, and more than 95% of them are NO. It is estimated that in 2015 my country's coal-fired power plants NO x The emissions will reach 13.1 million tons, which shows that controlling NO emissions is extremely important. With the continuous improvement of human living standards, countries all over the world attach great importance to the research, promotion and application of the treatment of emissions containing nitrogen oxides. [0003] The direct decomposition method of NO is economical and does not consume NH 3 , CO, CH 4 It is considered to be the most attractive method due to the characteristics of reducing agents such as reducing agents and not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/74B01D53/56B01J23/10B01J23/83B01J23/889
Inventor 周继承徐文涛罗羽裳游志敏
Owner XIANGTAN UNIV
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