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Catalytic denitrification method

A catalytic denitration and catalyst 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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Experimental program
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Embodiment 1

[0020] Preparation of Composite Metal Oxide Catalyst Cu(0.4)-NiO by Co-precipitation x , Ni(0.4)-FeO x , Cu(1)-NiO x and Cu(2.5)-NiO x (such as Cu(0.4)-NiO x It represents that the stoichiometric ratio of Cu and Ni in this composite metal oxide is 0.4:1). According to the stoichiometric ratio, take the required metal nitrate solution (concentration is 1mol / L) and mix evenly, slowly drop the mixed metal salt solution into 1mol / L Na 2 CO 3 (control solution temperature is 50 ℃) carry out precipitation reaction. When the pH of the control end point was 8, the dropwise addition was stopped. Stirring and aging were continued for 3 h at the same temperature. Then wash, filter, and dry at 60°C for 5h to obtain a catalyst precursor, which is calcined in a muffle furnace at 400°C for 5h to obtain the desired stoichiometric ratio of Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x and Cu(2.5)-NiO x Composite metal oxide catalyst samples.

Embodiment 2

[0022] The method of the present invention includes filling the reaction tube of the microwave catalytic reactor device with catalyst to form a microwave catalytic reaction bed, and the gas to be treated undergoes a gas-solid phase reaction when passing through the microwave catalytic reaction bed for denitrification treatment; the composite metal oxide The catalyst includes Cu-Ni composite metal oxide and Ni-Fe composite metal oxide, composed of Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x and Cu(2.5)-NiO x ; The catalyst is filled in the reaction tube of the microwave catalytic reactor device, when the treated gas 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.

[0023] In this embodiment, the waste gas provided by Dalian Date Gas Co., Ltd. is N 2 and NO, the NO concentration is 1000ppm. NO x Analyzer is...

Embodiment 3

[0030] It is basically the same as Example 2, except that the content of oxygen in the intake air is changed to 0-10%.

[0031] The packed catalyst is Cu(0.4)-NiO x , Ni(0.4)-FeO x , Cu(1)-NiO x and Cu(2.5)-NiO x . The loading amount of the catalyst is 2g respectively, and the mesh number is 20-60 mesh. The intake NO concentration is 1000ppm, the oxygen content in the intake air is changed to 0%, 5%, 7.5%, and 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 2.

[0032] Table 2

[0033]

[0034] It can be seen from Table 2 that in the presence of oxygen, the conversion rate of NO is not affected by the oxygen concentration on various catalysts, indicating that t...

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Abstract

The invention provides a catalytic denitrification method. The method is carried out in a microwave field. A used catalyst is a nickel-containing mixed metal oxide which is a Cu-Ni mixed metal oxide or a Ni-Fe mixed metal oxide, wherein preferably, when the molar weight of nickel in the nickel-containing mixed metal oxide is 1, the molar weight of copper or iron is 0.4-2.5. 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 98.9%), 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 catalyzing and directly decomposing NO for denitrification with a composite 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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IPC IPC(8): B01D53/86B01D53/56
Inventor 周继承徐文涛罗羽裳游志敏
Owner XIANGTAN UNIV
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