KR101634675B1 - Dielectric barrier discharge plasma system with catalyst and method for removing carbon dioxide and methane using the same - Google Patents

Abstract

The present invention provides a dielectric barrier discharge-catalyst composite apparatus and a method for removing methane and carbon dioxide using the apparatus.
According to the disclosed method, a catalyst is introduced into a low-temperature plasma reactor to increase the reaction activity of carbon dioxide and methane to remove environmental pollutants such as carbon dioxide and methane gas, thereby contributing to environmental preservation, and a syngas generated during the decomposition reaction of carbon dioxide and methane H ₂ and CO can be used for the production of high value-added hydrocarbon compounds and the like.

Description

[0001] The present invention relates to a dielectric barrier discharge-catalyst composite apparatus and a method for removing methane and carbon dioxide using the same,

The present invention, the dielectric barrier discharge-catalyst composite apparatus and relates to methane and carbon dioxide removal method using the same, and more specifically to add the catalyst to a dielectric barrier discharge device, by using it to remove methane and carbon dioxide, H ₂ and CO synthesis gas For example.

Carbon dioxide (CO ₂ ) and methane (CH ₄ ) act as greenhouse gases that block the release of solar radiation, returning some of the energy out of space to space by radiation, It acts as a cause of global warming. Gases affecting global warming include carbon dioxide, chlorofluorocarbons (CFCs), nitrogen dioxide (N ₂ O), and methane (CH ₄ ), among which CO2 accounts for more than 55%.

Recently, efforts to regulate carbon dioxide emissions have been expanding internationally, and related process technologies for improving energy efficiency, development of alternative energy, and recycling of carbon dioxide have been highlighted.

In addition, methane reacts with carbon dioxide to obtain syngas with high added value as a chemical raw material, and has been actively studied, and a method of producing carbon monoxide with hydrogen and carbon monoxide by reacting carbon dioxide with methane has been actively studied.

The reaction to produce hydrogen and carbon monoxide mixture by reacting methane with carbon dioxide has been focused on the selection of catalyst and carrier both at home and abroad and on the influence of reaction conditions.

The catalyst for the reaction of methane with carbon dioxide to produce a mixture of hydrogen and carbon monoxide can be largely divided into two types, namely, a nickel catalyst and a noble metal catalyst composed of platinum, palladium, and rhodium. It is preferable to improve and use a nickel catalyst system which is widely used as an existing steam reforming catalyst because it is less likely to be industrialized in view of economics.

However, in the case of the nickel catalyst, there is a problem of sintering of the metal component and the like because of the resistance to the formation of coke and inactivation due to the phase change during the reaction at a high temperature.

Furthermore, a major problem in the reaction of methane with carbon dioxide to produce hydrogen and carbon monoxide mixtures is the deactivation of the catalyst due to the deposition of carbon over time.

Further, when a noble metal catalyst is used, there is little or no deactivation, but there is a practical problem due to a high catalyst price.

On the other hand, the reaction for producing hydrogen and carbon monoxide mixture by reacting methane with carbon dioxide may cause a reverse reaction to generate carbon by a strong endothermic reaction. In order to prevent this reaction, a reaction is required to be induced at a high temperature, It is true.

[Prior Art Literature]

1. Korean Patent Registration No. 10-2009-0086761 (Publication date: 2009.08.14)

2. Korean Patent Registration No .: 10-2010-0011687 (Published on February 23, 2010)

3. Korean Patent Registration No. 10-2009-0087298 (Published on Aug. 19, 2009)

4. Korean Patent Registration No. 10-2013-0026869 (Publication date: March 23, 2013)

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-described problems, and it is an object of the present invention to provide a process for producing H ₂ and CO through efficient removal of methane (CH ₄ ) and carbon dioxide (CO ₂ ) And a catalyst and a dielectric barrier discharge-catalyst composite device.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a plasma reactor comprising: packing a catalyst particle in a plasma reactor; generating an inductively coupled plasma in the plasma reactor packed with the catalyst particle; A method for removing methane and carbon dioxide using a dielectric barrier discharge-catalyst composite apparatus, comprising: supplying carbon dioxide and methane to a plasma reactor; reacting the carbon dioxide with methane; and separating a reaction product after the reacting step / RTI >

Further, in the step of packing the catalyst particles, the catalyst particles injected into the plasma reactor are characterized by being zeolite or porous silica-alumina.

Further, in the step of generating the inductively coupled plasma, the inductively coupled plasma is generated by an electric field applied from an RF-generator.

In addition, in the step of supplying the carbon dioxide and the methane to the plasma reactor, the carbon dioxide and methane are sprayed by the gas flow rate control device, and the sprayed carbon dioxide is first reacted with water and then heated to the plasma reactor Is supplied.

Also, in the step of separating the reaction product after the step of reacting according to the present invention, the reaction product may include H ₂ and CO synthesis gas.

In order to accomplish the above object, the present invention provides a dielectric barrier discharge reactor packed with catalyst particles according to the present invention, in which a discharge electrode is disposed inside, a gas barrier layer formed in one side of the dielectric barrier discharge reactor, A gas outlet formed on the other side of the dielectric barrier discharge reactor for discharging gas introduced from the gas inlet and connected to the discharge electrode and applying a voltage to the dielectric barrier discharge reactor, And an oscilloscope device attached to one side of the voltage supply device for displaying a voltage change, the plasma generating radicals from gas introduced from the gas inlet, and the radicals Reacts the methane with carbon dioxide And an apparatus for removing air pollutants for a dielectric barrier discharge-catalyst composite process.

Further, the discharge electrode is a copper (Cu) seal.

In addition, the gas introduced into the gas inlet includes carbon dioxide and methane.

The carbon dioxide introduced into the gas inlet may be heated to react with water before being introduced into the gas inlet, and then introduced into the reactor through the gas inlet.

According to the dielectric barrier discharge-catalyst composite apparatus of the present invention and the methane and carbon dioxide removal method using the apparatus, the atmospheric pollutants methane and carbon dioxide can be efficiently supplied through the dielectric barrier discharge-catalyst composite process using the plasma reactor packed with the catalyst particles Can be removed.

In addition, according to the DMFC of the present invention and the method for removing methane and carbon dioxide using the apparatus, the reaction products H ₂ and CO produced when the reaction of methane and carbon dioxide proceeds by the catalyst are highly valued And can be provided for the synthesis of oxygenated chemicals or long-chain hydrocarbons.

FIG. 1 is a flowchart illustrating a methane and carbon dioxide removal method using a dielectric barrier discharge-catalyst composite apparatus according to the present invention.
2 is a block diagram of a dielectric barrier discharge-catalyst composite apparatus for implementing the methane and carbon dioxide removal method according to the present invention.
FIG. 3 is a graph showing a result of a reaction between carbon dioxide and methane by a dielectric barrier discharge-catalyst composite apparatus according to an embodiment of the present invention and a reaction result of a comparative example by a dielectric barrier discharge apparatus in which a catalyst is not packed.
FIG. 4 is a graph showing the results of the comparison between the production yields of carbon monoxide and hydrogen molecules produced by the dielectric barrier discharge-catalyst composite apparatus according to the embodiment of the present invention and the comparison results of the comparative example using the dielectric barrier discharge apparatus in which the catalyst is not packed Graph.
5 is a graph showing the relationship between the intermolecular reaction rate according to the input ratio of methane molecules and carbon dioxide molecules in the dielectric barrier discharge-catalytic composite apparatus according to the embodiment of the present invention and the reaction result of the comparative example with the dielectric barrier discharge apparatus in which the catalyst is not packed Fig.
FIG. 6 is a graph showing the difference in concentration of carbon monoxide and hydrogen molecules discharged through the reactor through the reactor when the respective methane and carbon dioxide molecules are charged at different ratios in the dielectric barrier discharge- It is a graph showing by the ratio of carbon dioxide and methane.
FIG. 7 is a graph showing the relationship between the concentration of carbon monoxide and hydrogen molecules as a result of the reaction using the dielectric barrier discharge-catalyst composite apparatus according to the embodiment of the present invention, and the results of the reaction of the comparative example by the dielectric barrier discharge apparatus in which the catalyst is not packed, Of the total amount of water.
8 is a graph showing reaction conversion rates of carbon dioxide and methane using a corona discharge device as another comparative example.
FIG. 9 is a graph showing, as another comparative example, the concentration of carbon monoxide and hydrogen produced as a result of the reaction using the corona discharge device, by the ratio of carbon dioxide and methane.
FIG. 10 is a graph showing, as another comparative example, the production rates of carbon monoxide and hydrogen as reaction products in the reaction using the corona discharge device by the ratio of carbon dioxide and methane.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Embodiments in accordance with the concepts of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ",or" having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

FIG. 1 is a flowchart illustrating a methane and carbon dioxide removal method using a dielectric barrier discharge-catalyst composite apparatus according to the present invention.

The method of removing methane and carbon dioxide using the dielectric barrier discharge-catalyst composite apparatus according to the present invention, as shown in FIG. 1, first packs the catalyst particles in the reactor (S100)

At this time, the catalyst particles packed in the plasma reactor are preferably made of a zeolite, silica-alumina compound having a porous structure and excellent in adsorption ability and strong oxidation-reduction ability as a solid acid catalyst.

Next, an inductively coupled plasma is generated in the reactor 1000 (S200). At this time, the inductively coupled plasma may be generated by an electric field generated from the voltage supply device 2000, as shown in FIG. At this time, the state of the inductively coupled plasma generated can be analyzed by the waveform supplied by using the oscilloscope 2100.

Then, methane and carbon dioxide are supplied to the plasma reactor 1000 through an inlet 3000 (S300).

At this time, the gaseous methane and carbon dioxide are supplied to the inside of the plasma reactor 1000 with the flow rate controlled by a gas flow control device (MFC, 6000).

The carbon dioxide whose flow rate has been adjusted by the gas flow rate controller 6000 passes through the carbon dioxide inlet 3100 after passing through the water first and then supplied to the plasma reactor 1000. The temperature controller 3200 The temperature of the carbon dioxide gas can be controlled.

Next, a reaction between carbon dioxide and methane occurs in the reactor 1000 where plasma is generated (S400). At this time, the reaction product present in the reactor is a synthesis gas containing H ₂ and CO.

Next, the reaction product is separated through the separator 4000 (S500). At this time, the separated particles can measure the kind and concentration of the reaction product through the gas chromatograph device 5000 formed on one side of the separator. In addition, gas particles separated through separator 4000 can be used to synthesize oxygen-containing compounds and long chain hydrocarbons used as energy sources as H ₂ / CO gases with a low molar ratio close to one.

As described above, according to the method for removing methane and carbon dioxide using the dielectric barrier discharge-catalyst composite apparatus of the present invention, the effect of removing the air pollutants such as carbon dioxide and methane by the catalytic action of the catalyst particles themselves, It is possible to apply the effect of removing the air pollutant by the dielectric barrier discharge using the low temperature plasma.

Furthermore, it is a useful method because it can expect an additional effect that the reaction product can be used for the synthesis of an energy source.

Next, the dielectric barrier discharge-catalyst composite apparatus will be described.

2 is a block diagram of a dielectric barrier discharge-catalyst composite apparatus for implementing the methane and carbon dioxide removal method according to the present invention.

The dielectric barrier discharge-catalyst composite apparatus according to the present invention may include a dielectric barrier discharge reactor 1000, a power supply apparatus 2000, and a gas supply apparatus 3000, as shown in FIG.

The dielectric barrier discharge reactor 1000 may be provided with a discharge electrode 1100 of a copper (Cu) rod passing through the center of the inside of the dielectric barrier discharge reactor 1000 from one side to the other side and the catalyst particles may be packed inside the reactor have.

In addition, the dielectric barrier discharge reactor 1000 may include a gas inlet 3000 through which gas containing atmospheric pollutants is introduced into the dielectric barrier discharge reactor 1000 at one side.

The dielectric barrier discharge reactor 1000 may include a gas discharge port 4000 through which gas discharged from the gas inlet 3000 to the other side of the dielectric barrier discharge reactor 1000 is discharged.

Here, the gas outlet 4000 may be connected to a discharge pipe to discharge the gas passing through the dielectric barrier discharge reactor 1000 to the outside, and a valve 4100 may be installed in the discharge pipe so as to control the flow rate of the discharged gas. .

The voltage supply device 3000 may be electrically connected to the discharge electrode 1100 provided in the dielectric barrier discharge reactor 1000 to supply a voltage.

The CO ₂ can be specifically transferred from the carbon dioxide supply device 3100 to the gas inlet port 3000 through the gas supply pipe and the gas flow rate regulator 6000 can be controlled by the oxygen supply device 3000 so that the flow rate of CO ₂ can be controlled by the user. (Not shown).

Gas supplied from the gas supply device (3000) may further include H ₂ O _(g) in the gas phase, in the present invention, the H ₂ O between the carbon dioxide supply apparatus 3200 and the gas supply pipe is CO ₂ feed _{(g) The} supply device 3400 is installed, and H ₂ O _(g) can be supplied to the inside of the dielectric barrier discharge reactor 1000 according to the transfer of CO ₂ .

The CH4 can also be transferred from the methane feeder 3200 to the gas inlet 3000 through the gas feed line and the methane gas flow rate regulator 6100 can be controlled by the methane feeder 3200).

The voltage supplying apparatus 2000 applies a voltage to the discharge electrode 1100 provided in the dielectric barrier discharge reactor 1000 and supplies the voltage to the discharge electrode 1100 by the electric field formed around the discharge electrode 1100 The electrons have high energy and form a low-temperature plasma.

The low-temperature plasma generates reactive radicals from the gas supplied to the inside of the dielectric barrier discharge reactor 1000, and the generated radicals generate hydrogen and carbon monoxide by strong oxidative reduction reaction with carbon dioxide and methane, Synthesis gas of hydrogen and carbon monoxide can be synthesized as an energy source.

As described above, according to the method for removing pollutants using the dielectric barrier discharge-catalyst composite apparatus of the present invention, the catalyst particles are packed in the reactor of the dielectric barrier discharge-catalyst composite apparatus to remove air pollutants CO ₂ and CH ₄ The removal of air pollutants by the action of the low-temperature plasma and the catalytic particles can effectively remove air pollutants.

Hereinafter, the present invention will be described in detail on the basis of experimental examples. The presented examples are illustrative and are not intended to limit the scope of the invention.

≪ Example 1 >

A dielectric barrier discharge device according to an embodiment of the present invention uses a device using a 5 mm copper bar as a discharge electrode for generating a low-temperature plasma in a reactor. In addition, the reactor which does not pack the catalyst particles is composed of a glass tube surrounded by a stainless steel mesh, and in the embodiment of the present invention, zeolite particles are used as catalyst particles.

Referring to FIG. 3, FIG. 3 is a graph illustrating the results of the reaction between carbon dioxide and methane by the dielectric barrier discharge-catalyst composite apparatus according to the embodiment of the present invention and the results of the reaction of the carbon black and methane by the dielectric barrier discharge apparatus And the results of the reactions are compared with each other.

According to the present invention, by removing the carbon dioxide and methane by using the method using the dielectric barrier discharge-catalyst composite device in which the zeolite catalyst particles are packed and the method using the dielectric barrier discharge device in which the catalyst particles are not packed, Respectively.

First, referring to FIG. 3, it can be seen that the reaction conversion ratio of carbon dioxide and methane increases as the voltage increases. However, it shows that the conversion rate of the dielectric barrier discharge-catalyst composite device in which the catalyst particles are packed is higher.

4 is a graph showing the results of the comparison between the production rates of carbon monoxide and hydrogen molecules produced as a result of the reaction by the dielectric barrier-discharge-catalyst composite device according to the embodiment of the present invention and the reaction results of the control group by the barrier- It is a graph.

Referring to FIG. 4, it is shown that the carbon monoxide and hydrogen molecule generation rates of the dielectric barrier discharge-catalyst composite apparatus in which the catalyst particles are packed are higher.

5 is a graph showing the relationship between the ratio of the intermolecular reaction between the methane molecule and the carbon dioxide molecule in the dielectric barrier discharge-catalytic composite apparatus according to the embodiment of the present invention and the reaction rate of the control group by the dielectric barrier discharge apparatus in which the catalyst is not packed And the results are compared with each other.

Referring to FIG. 5, it can be seen that the conversion rate of the dielectric barrier-discharge-catalyst composite apparatus packed with the catalyst particles is higher according to the input mole ratio of methane and carbon dioxide.

6 is a graph showing changes in the concentrations of carbon monoxide and hydrogen molecules generated at different ratios when methane molecules and carbon dioxide molecules are charged at different ratios in the dielectric barrier discharge-catalyst composite apparatus according to the embodiment of the present invention to be. Referring to FIG. 6, when four molecules of methane per one molecule of carbon dioxide are reacted, the concentration of carbon monoxide and hydrogen molecules is highest.

7 is a graph showing the relationship between the concentration of carbon monoxide and hydrogen molecules as a result of the reaction using the dielectric barrier discharge-catalyst composite apparatus according to the embodiment of the present invention and the reaction result of the control group by the dielectric barrier discharge apparatus in which the catalyst is not packed Fig. Referring to FIG. 7, the dielectric barrier discharge-catalyst composite apparatus in which catalyst particles are packed exhibits higher production rates of carbon monoxide and hydrogen molecules as reaction products.

As described above, the dielectric barrier discharge-catalyst composite apparatus according to the present invention proves that carbon dioxide and methane can be removed more efficiently than a reactor in which the catalyst is not packed.

Next, as another comparative example of the dielectric barrier discharge-catalyst composite device of the present invention, the reaction was induced by using a corona discharge system without catalyst, and the results were compared with those of the present invention.

FIG. 8 is a graph showing the conversion ratios of carbon dioxide and methane in the reaction using the corona discharge device in the carbon dioxide and methane removal reaction according to another comparative example of the present invention.

9 is a graph showing the concentrations of carbon monoxide and hydrogen, which are the products of the reaction using the corona discharge device, in terms of the ratio of carbon dioxide and methane in the carbon dioxide and methane removal reaction according to another comparative example of the present invention.

10 is a graph showing the concentrations of carbon monoxide and hydrogen by the ratio of carbon dioxide and methane in the carbon dioxide and methane removal reaction according to another comparative example of the present invention.

As described above, it can be seen from the graphs that the reaction results according to the embodiment of the present invention have a large difference in reaction efficiency when the dielectric barrier discharge device is used together with the catalyst, and the dielectric barrier discharge- It can be seen that carbon dioxide and methane can be removed more efficiently.

In addition, hydrogen and carbon monoxide, which are generated in the course of the reaction of the dielectric barrier discharge-catalyst composite apparatus and the methane and carbon dioxide removal method using the apparatus, can be collected and provided for the production of high-value oxygenated compounds or long chain hydrocarbons .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1000: dielectric barrier discharge reactor (plasma reactor) 1100: copper bar (discharge electrode)
2000: Voltage supply 2100: Oscilloscope
3000: gas inlet 3100: carbon dioxide inlet
3200: methane inlet 3300: thermostat
3400: H ₂ O _(g) Feeder 4000: gas outlet
4100: gas discharge control valve 5000: gas chromatography
6000: Gas flow regulator

Claims (9)

Packing catalyst particles made of porous silica-alumina in a plasma reactor;
Generating an inductively coupled plasma in the plasma reactor packed with the catalyst particles;
Supplying carbon dioxide and methane to the plasma reactor in which the inductively coupled plasma is generated;
Reacting the carbon dioxide with the methane; And
And separating the reaction product after the reacting step. The method for removing methane and carbon dioxide using the dielectric barrier discharge-
delete delete delete delete A dielectric barrier discharge reactor packed with catalyst particles made of porous silica-alumina and provided with a discharge electrode therein;
A gas inlet formed at one side of the dielectric barrier discharge reactor for introducing a gas containing carbon dioxide and methane into the dielectric barrier discharge reactor;
A gas outlet formed on the other side of the dielectric barrier discharge reactor for discharging gas introduced from the gas inlet;
A voltage supplier connected to the discharge electrode and generating a plasma in the dielectric barrier discharge reactor by applying a voltage to the discharge electrode;
And an oscilloscope device attached to one side of the voltage supply device to display a voltage change, wherein the plasma generates radicals from the gas introduced from the gas inlet, and the radical reacts with the carbon dioxide A device for removing airborne contaminants for a dielectric barrier discharge-catalyst composite process.
delete delete delete

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