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Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst

A dielectric barrier discharge and plasma technology, applied in the field of air pollution purification, can solve the problems of low catalytic oxidation activity, complex preparation process, high reaction temperature, etc., and achieve the effects of simple operation, short modification time and low energy consumption

Inactive Publication Date: 2015-07-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature is high (200°C), the catalytic oxidation activity is low, and the preparation process is complicated and the cost is high.

Method used

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  • Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst
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  • Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst

Examples

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Effect test

Embodiment 1

[0022] Example 1: The method for catalytic oxidation of NO by dielectric barrier discharge plasma modification catalyst, the specific operation is as follows:

[0023] (1) Catalyst preparation: Mix manganese acetate, potassium permanganate and cobalt nitrate, grind them thoroughly for 30 minutes, place them in an oven at 70°C for 48 hours at a constant temperature, wash the product three times with deionized water, filter with suction, and then use Wash with water and ethanol for 3 times, and filter with suction; dry the solid at 100°C for 12 hours, press into tablets, grind, and sieve to make 40-60 mesh particles to obtain the manganese-cobalt oxide catalyst Mn-Co-O x , wherein the mol ratio of manganese acetate and potassium permanganate is 2:3, and the mol ratio of Mn:Co is 9:1;

[0024] (2) Mn-Co-O x The catalyst is placed in a plasma reactor for modification. The plasma adopts a coaxial cylindrical dielectric barrier reactor. A stainless steel high-voltage elect...

Embodiment 2

[0026] Example 2: The method for catalytic oxidation of NO by dielectric barrier discharge plasma modification catalyst, the specific operation is as follows:

[0027] (1) The catalyst preparation method is the same as in Example 1, and then the Mn-Co-O x The catalyst is placed in a plasma reactor for modification, and the structure of the plasma reactor is the same as in Example 1. The modification condition is air plasma, the output voltage is 8kV, and the modification time is 1h. The catalyst obtained after modification is denoted as Mn-Co-O x -air-8kV-1h;

[0028] (2) The plasma-modified catalyst Mn-Co-O x -air-8kV-1h is placed in a glass tube fixed bed reactor, and NO, O 2 , N 2 Mixed gas, the temperature is controlled by the program temperature controller at 50~250°C, in which, the gas composition (volume percentage) at the reactor inlet is NO 0.05%, O 2 3%, N 2 It is the balance gas, the total flow rate of the mixed gas is 200ml / min, and the space veloci...

Embodiment 3

[0029] Example 3: The method for catalytic oxidation of NO by dielectric barrier discharge plasma modification catalyst, the specific operation is as follows:

[0030] (1) The catalyst preparation method is the same as in Example 1, and then the Mn-Co-O x The catalyst is placed in a plasma reactor for modification. The structure of the plasma reactor is the same as in Example 1, except that the inner diameter of the dielectric glass tube is 8 mm, and the diameter of the stainless steel high-voltage electrode is 3 mm. The modification condition is oxygen plasma, the output voltage is 8kV, and the modification time is 1h. The catalyst obtained after modification is denoted as Mn-Co-O x -O 2 -8kV-1h;

[0031] (2) The plasma-modified catalyst Mn-Co-O x -O 2 -8kV-1h is placed in a glass tube fixed bed reactor, and NO, O 2 , N 2 Mixed gas, the temperature is controlled by the program temperature controller at 50~250°C, in which, the gas composition (volume percentage...

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Abstract

The invention discloses a method for catalytically oxidizing NO by a dielectric barrier discharge plasma modified catalyst. The method comprises the steps of filling a catalyst into a dielectric barrier discharge plasma reactor to be modified; and placing the modified catalyst into a glass pipe type fixed bed reactor and introducing mixed gas to catalytically oxidize the NO into NO2. The modified catalyst has higher low-temperature catalytic activity and the NO catalytic oxidization efficiency can reach 75-85% at maximum; the cylindrical dielectric barrier discharge plasma reactor is adopted so as to be convenient for observing modification conditions of the catalyst; the actual operation is simple and the modification condition is easy to control; the energy consumption is lower; the modification time is shorter; the product NO2 can be absorbed by an alkali solution to obtain a byproduct and can be recycled; and the method is convenient for actual production and application and has a higher industrial application value.

Description

technical field [0001] The invention relates to a method for catalytically oxidizing NO with a dielectric barrier discharge plasma modification catalyst, and belongs to the technical field of application of a dielectric barrier discharge plasma modification catalyst to air pollution purification. Background technique [0002] With the rapid development of economy, the problem of environmental pollution caused by energy consumption is becoming more and more serious. Currently, the world NO x More than 95% of the emissions come from the combustion of fossil fuels, and the NO emitted in the flue gas x Among them, NO accounts for 90%~95%. Nitrogen oxides are the main air pollutants that cause acid rain, photochemical smog, etc., which damage the earth's ecological environment and damage human health. Therefore, how to eliminate the pollution of nitrogen oxides is a topic of great concern in environmental protection. [0003] At present, the selective catalytic reduction tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/88B01D53/56B01D53/75B01J23/889B01J37/34
CPCY02A50/20
Inventor 唐晓龙向瑛易红宏李凯王建根马洁云
Owner KUNMING UNIV OF SCI & TECH
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