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Method for catalytic oxidation of nitric oxide with low-temperature plasma modified catalyst

A technology of low-temperature plasma and nitrogen oxides, applied in the direction of separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high activation temperature, high energy consumption, high cost, etc., and achieve good selectivity and operation Simple, High-Converting Effects

Inactive Publication Date: 2010-09-08
KUNMING UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

Patent CN1275425 (2000) adopts a chemical reaction absorption method combined with corona discharge and solid absorbent for NO X The purification is to oxidize NO to NO under the action of plasma 2 , and then absorbed by a solid absorbent, but the energy consumption of the reaction equipment is high, and it needs to be heated to a very high temperature NO X The conversion rate will be more obvious
[0005] CN101530795A (2009) discloses a method for preparing a catalyst for catalyzing the oxidation of nitrogen oxides. It cooperates with plasma technology to realize the catalytic oxidation of NO. The catalyst has outstanding oxidation activity. Convert 95% to 99% of NO into N 2 o 5 , N 2 o 5 The ammonium nitrate product is obtained after ammonia water absorption, which realizes the resource utilization of NO. This method overcomes the disadvantages of agglomeration in the traditional wet method. At the same time, the reaction has the advantages of no solvent, high yield, and easy control of reaction conditions. It is a kind of A simple and feasible method for preparing nanoscale catalysts, low-temperature plasma has a more obvious oxidation effect on NO, but the energy consumption is relatively high
[0006] Disclosed in CN101259368A (2008) is a kind of method that uses ZSM-5 type molecular sieve as catalyst to catalyze the oxidation of NO. X O in exhaust gas 2 As an oxidant, it oxidizes NO in aerobic waste gas to NO at 0-100°C 2 , the catalyst has good low-temperature catalytic activity and hydrophobicity, and still maintains good catalytic activity when the relative humidity reaches 100%, which solves the problems of poor water resistance and high activation temperature of traditional NO oxidation catalysts, but the preparation of the catalyst is cumbersome ,higher cost

Method used

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  • Method for catalytic oxidation of nitric oxide with low-temperature plasma modified catalyst

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Experimental program
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Effect test

Embodiment 1

[0026] Mix citric acid and manganese acetate with a molar ratio of 0.67, dissolve with deionized water and stir for 4 hours according to the solid-to-liquid ratio of 0.33; hour, when the foamy solid appears in the flask, take it out, and dry thoroughly in a 100°C oven for 6 hours to obtain the precursor of the catalyst; Manganese-based oxide catalyst A was obtained by treating for 5 hours under the condition of 0.2A, tableting, sieving and pulverizing into 40-60 mesh particles. The plasma adopts a coaxial dielectric barrier reactor. A stainless steel electrode with a diameter of 10 mm is inserted in the center of a corundum tube with an outer diameter of 25 mm and a thickness of 2.5 mm. The outer wall of the corundum tube is wound with stainless steel mesh as a high-voltage electrode, and a stainless steel wall plate is used as a low-voltage electrode.

[0027] Catalytic oxidation reaction condition: Catalyst A 0.2g; Reactor inlet gas composition (volume ratio) NO 0.05%, O 2 ...

Embodiment 2

[0032] Mix citric acid and manganese acetate with a molar ratio of 0.50, dissolve with deionized water and stir for 4 hours according to the solid-to-liquid ratio of 0.25; after the stirring is completed, place it in a rotary evaporator for foaming treatment, and treat at 70°C 8 hours, when the foamy solid appears in the flask, take it out, dry it in an oven at 100°C for 6 hours, then bake it in air at 400°C for 6 hours, and finally place the catalyst in a low-temperature plasma. Treat under the condition of 1.0A for 6 hours, press into tablets, sieve and pulverize to make 40-60 mesh particles, and obtain manganese-based oxide catalyst B. The plasma is the same as in Example 1.

[0033] Catalytic oxidation reaction condition: Catalyst B 0.2g; Reactor inlet gas composition (volume ratio) NO 0.05%, O 2 3%, nitrogen as carrier gas; total gas flow rate 200cm 3 / min (airspeed=30600h -1 ).

[0034] Will contain NO, O 2 , N 2 The mixed gas is heated to 200°C through a glass tu...

Embodiment 3

[0038] Prepare the following three solutions: (1) dissolve 18.4g manganese acetate in 500ml deionized water; (2) dissolve 2.62g polyethylene glycol in 100ml deionized water; (3) dissolve 7.9g potassium permanganate In 300ml of deionized water, gradually add solution (2) to solution (1) while stirring, then add solution (3), start stirring at room temperature for 6 hours, filter the mixture, and collect the filter paper The solid matter on the surface was washed with deionized water for 3 to 4 times, and suction filtered; continued to dry in an oven at 100°C for 6 hours, and finally placed the prepared catalyst in a low-temperature plasma for treatment, with an input voltage of 30V and a current of 0.5 A, the processing time is 6h. Manganese-based oxide catalyst C is prepared by grinding, tableting and sieving to make catalyst particles of 40-60 mesh.

[0039] Catalytic oxidation reaction conditions: catalyst C 0.2g; Reactor inlet gas composition (volume ratio) NO 0.05%, O 2 ...

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Abstract

The invention relates to a method for catalytic oxidation of nitric oxide with a low-temperature plasma modified catalyst. In the method, a catalyst is arranged in a plasma reactor to be modified under certain condition, thereby significantly improving the property of the catalyst for low-temperature catalytic oxidation, and the NO conversion rate can reach 80-86 percent at 50-150 DEG C. The NO in mixture can be oxidized into NO2 and enter into an ammonia absorption bottle along with the gas, thereby obtaining an ammonium nitrate product which can be used as a raw material of a fertilizer. The catalyst is mainly used for purifying NOX in the industrial waste gas emitted from coal-based power plants and other fixed sources. The invention can significantly improve the low-temperature oxidation activity of the catalyst, and facilitate the increase of the purification efficiency in the following liquid-phase absorption.

Description

technical field [0001] The invention relates to the application of low-temperature plasma modification catalyst technology to the technical field of air pollution purification, in particular to a method for catalytic oxidation of nitrogen oxides by using a low-temperature plasma modification catalyst. Background technique [0002] With the rapid development of modern industry and the extensive use of fossil fuels, nitrogen oxides (NO X ) The problem of pollution in the ambient air is becoming more and more serious. Environmental problems affecting human sustainable development, such as photochemical smog, acid rain, and the destruction of the ozone layer, are mostly related to NO emissions into the atmosphere. X Related, it mainly comes from mobile sources (motor vehicles) and stationary sources (mainly thermal power plants, industrial combustion devices, etc.). Relevant data show that NO accounts for NO X 90% to 95% of the total. With the implementation of the sustainab...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56C01C1/18B01J23/34
Inventor 唐晓龙李凯易红宏宁平彭金辉王家强叶智青康东娟
Owner KUNMING UNIV OF SCI & TECH
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