Method for denitration by catalytic direct decomposition of NO with perovskite type catalyst

A perovskite type, catalyst technology, applied in the field of catalytic decomposition of NO denitration, can solve the problems of complex removal process, low NO removal rate, etc., and achieve high removal efficiency, convenient operation and easy control, and strong oxidation resistance. Effect

Inactive Publication Date: 2015-03-25
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 problem of low NO removal rate and complex removal process in the prior art, the present invention provides an economical and practical nitrogen oxide removal method with simple process, high NO removal rate way of things

Method used

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  • Method for denitration by catalytic direct decomposition of NO with perovskite type catalyst
  • Method for denitration by catalytic direct decomposition of NO with perovskite type catalyst
  • Method for denitration by catalytic direct decomposition of NO with perovskite type catalyst

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Experimental program
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Effect test

Embodiment 1

[0021] According to the stoichiometric ratio (BaMn 1-x Mg x O 3 , X = 0, 0.1, 0.2, 0.3, 0.4) A certain amount of precursor salt was dissolved in 120 ml of distilled water, ultrasonicated for 15 minutes, heated to 50° C., and stirred for 15 minutes. Add appropriate amount of citric acid and ethylene glycol (the ratio of metal salt cation is 1.25), stir for 0.5h, then heat to 80°C and stir for 2h. Place it in an oven at 120°C for 12h, put it in a muffle furnace at 400°C for 2h, and then 700°C for 4h to obtain the corresponding catalyst powder.

Embodiment 2

[0023] The method of the present invention includes filling a catalyst in the reaction tube of a microwave catalytic reactor device to form a microwave catalytic reaction bed, and the exhaust gas to be treated undergoes a gas-solid phase reaction when passing through the microwave catalytic reaction bed for denitration treatment; the catalyst is BaMn 1-x Mg x O 3 (x=0,0.1,0.2,0.3,0.4); The catalyst is filled in the reaction tube of the microwave catalytic reactor device. When the exhaust gas to be treated passes through the microwave catalytic reaction bed, the NO in the gas directly decomposes and reacts to generate an environment Friendly N 2 And O 2 , In order to achieve the purpose of direct denitration. The temperature of the direct catalytic decomposition reaction is 100°C to 400°C, preferably 200-300°C; the pressure of the direct catalytic decomposition reaction is normal pressure or slightly higher than atmospheric pressure.

[0024] In this embodiment, the waste gas to be...

Embodiment 3

[0031] It is basically the same as Example 2, except that the oxygen content in the intake air is changed to 0-10%.

[0032] The packed catalyst is BaMn 1-x Mg x O 3 , The filling amount of the catalyst is 2g, and the mesh number is 20-60 mesh. The intake NO concentration is 1000 ppm, the oxygen content in the intake 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 2.

[0033] Table 2

[0034]

[0035]

[0036] Among them, the imported NO content is 1000ppm. When oxygen is present, almost all NO is converted into safe N 2 , The NO conversion rate at 250°C is above 97.2%, indicating that the perovskite catalyst has good oxidation resistance in the mi...

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Abstract

The invention provides a method for denitration by catalytic direct decomposition of NO with a perovskite type catalyst. The method is performed in a microwave field and the catalyst is a manganese-based perovskite catalyst. Preferably, the catalyst is BaMn1-xMgxO3, wherein x is 0-0.4. When the specific perovskite catalyst provided by the invention is matched with microwaves, direct catalytic decomposition of NO can be performed under the conditions of low temperature and high oxygen content. The microwave catalytic direct decomposition reaction of NO has no secondary pollution; and furthermore, the process is simple, the operation is convenient and easy to control, the removal efficiency of NO is high (the conversion rate of NO can achieve 99.8%), and the method further has the advantages of strong oxidation resistance, low operation temperature, energy conservation, environmental friendliness and low operation cost. Smoke gas or waste gas after treatment by using the method provided by the invention can directly achieve a national emission standard.

Description

Technical field [0001] The invention relates to the field of catalytic decomposition of NO and denitrification, in particular to a method for directly decomposing NO and denitrifying by a perovskite type catalyst. Background technique [0002] Nitrogen oxide is one of the main pollutants that seriously endanger human health, and more than 95% of its composition is NO. It is estimated that my country’s coal-fired power plants NO x 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 because of its characteristics such as reducing agent and no secondary pollution. The reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/74B01D53/56B01J23/34
Inventor 周继承徐文涛罗羽裳游志敏
Owner XIANGTAN UNIV
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