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Denitration method for two-section microwave catalytic reaction bed

A microwave catalysis and reaction bed technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of high requirements for pipeline equipment, large consumption of reducing agents, low denitration efficiency, etc., and achieve production costs. Low, high conversion rate, no secondary pollution effect

Inactive Publication Date: 2012-04-11
XIANGTAN UNIV
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Problems solved by technology

Its disadvantages: the consumption of reducing agent is large, the catalyst is easily poisoned, the requirements for pipeline equipment are high, and the denitrification efficiency is not high

Method used

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  • Denitration method for two-section microwave catalytic reaction bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first stage of microwave catalytic reaction bed microwave catalytic direct decomposition of NO reaction.

[0025] The loaded catalyst is 5g of CuO-Cu-ZSM-5, the mass fraction of Cu in Cu-ZSM-5 is 5%, and the mass fraction of CuO in CuO-Cu-ZSM-5 is 40%.

[0026] The intake NO flow rate is controlled at 160ml / min, and the oxygen content is 5.88%.

[0027] The microwave power is automatically controlled to keep the catalyst bed temperature at 180°C, 300°C, and 380°C respectively, and the reaction pressure is normal pressure.

[0028] The results are shown in Table 1:

[0029] Table 1. Reaction results of different catalyst bed temperatures

[0030] serial number

[0031] Conclusion: When the catalyst bed temperature is 380 ℃, CuO-Cu-ZSM-5 has a significant effect of decomposing NO in the microwave catalytic reactor, and the NO conversion rate reaches 98.93%.

Embodiment 2

[0033] Effect of Oxygen Content on Microwave Catalytic Decomposition of NO.

[0034] Basically the same as in Example 1, except that the temperature of the catalyst bed was maintained at 300°C, the oxygen flow rate and content were changed, and the oxygen resistance of the catalyst in microwave catalytic decomposition of NO was investigated. The results are shown in Table 2.

[0035] Table 2. Effect of oxygen content on microwave catalytic decomposition of NO

[0036]

[0037] Among them, the imported NO content is 1000ppm. When oxygen exists, NO is almost completely converted into safe N 2 , the catalyst bed temperature is controlled at 300°C, and the NO conversion rate is above 98%; the oxygen content has no effect on the microwave catalytic decomposition NO conversion rate, and the catalyst has good oxygen resistance during microwave catalysis.

Embodiment 3

[0039] The second stage microwave catalytic reaction bed microwave catalytic reduction NO reaction.

[0040] Fill 10ml of activated carbon in the quartz reaction tube of a new microwave catalytic reactor, investigate the oxygen content and test the performance of Mn-modified activated carbon for catalytic reduction of NO under microwave. The effect of oxygen content on Mn / AC catalyst for microwave catalytic reduction of NO is shown in Table 3.

[0041] Reaction conditions: 3% Mn / AC filling volume 10ml, gas flow rate 160ml / min, nitrogen monoxide feed gas content 1000ppm, temperature 400°C.

[0042] Table 3. The effect of oxygen content on the catalytic reduction of NO by Mn-modified activated carbon under microwave

[0043] serial number

[0044] Conclusion: Oxygen content has no significant effect on the conversion of NO by microwave catalytic reduction of Mn / AC catalyst. The NO conversion rate can be as high as 99.72% through the microwave catalytic reduction reac...

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Abstract

The invention relates to a denitration method for a two-section microwave catalytic reaction bed. The method comprises the following steps: filling a catalyst in a reaction tube of a microwave catalytic reactor device, thereby forming a microwave catalytic reaction bed, and then generating a gas-solid reaction by use of a processed gas while passing by the microwave catalytic reaction bed, thereby performing the denitration treatment. The microwave catalytic reaction bed is composed of two independent microwave catalytic reaction beds which are mutually connected in series; Cu-HZSM-5 or Mn / MgFe2O4 catalyst is taken as the catalyst in a first section microwave catalytic reaction bed; activated carbon or activated carbon loaded MnO, CuO or CeO-CuO, MgO-FeOx, CeO-ZrO2 catalyst is taken as the catalyst in a second section microwave catalytic reaction bed; and the processed gas passes by the first and second section microwave catalytic reaction beds in turn and is subjected to a direct decomposition reaction and a selective reduction reaction in turn, thereby removing the nitric oxide. The denitration method has the advantages of being free from secondary pollution and corrosion, high in conversion rate, small in energy consumption, energy-saving, environmentally-friendly, low in running cost, and the like.

Description

technical field [0001] The invention relates to a two-stage microwave catalytic reaction bed denitrification method. Background technique [0002] Nitrogen oxide NO x It has caused great harm to human health and the ecological environment. How to take efficient denitrification measures to eliminate NO x Pollution has become an important issue in environmental protection. At present, the technology applied in industry is the selective catalytic reduction technology (NH 3 -SCR), this technology has made positive contributions to my country's environmental protection. NH 3 - The SCR method is one of the most mature methods in the existing nitrogen oxide treatment technology, which can make the nitrogen oxide removal rate reach 80-90% at a relatively low temperature. Its disadvantages: the consumption of reducing agent is large, the catalyst is easily poisoned, the requirements for pipeline equipment are high, and the denitrification efficiency is not high. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/90B01D53/56B01J19/12B01J8/06
Inventor 周继承王哲李虎游志敏高令飞
Owner XIANGTAN UNIV
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