Method of converting carbon dioxide, and method of capturing and converting carbon dioxide

This application claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2010-0121336, filed in the Korean Intellectual Property Office on Dec. 1, 2010, and Korean Patent Application No. 10-2011-0122970, filed in the Korean Intellectual Property Office on Nov. 23, 2011, the entire contents of each of which are incorporated herein by reference.

1. Field

This disclosure relates to a method of converting carbon dioxide, and a method of capturing and converting carbon dioxide.

2. Description of the Related Art

A flue gas may include carbon dioxide. When the carbon dioxide is discharged into the atmosphere, the carbon dioxide may cause or contribute to a greenhouse effect or the like.

Accordingly, research has been conducted on the capture of carbon dioxide so as to provide a synthesis gas with less detrimental effects to the environment.

Various embodiments relate to a method of converting CO 2 and/or a method of capturing and converting CO 2 in a relatively simple and economical way.

According to a non-limiting embodiment, a method of converting CO 2 may include mixing a reducing material reforming agent (also referred to herein as a reforming agent) including one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof with a reducing material to provide a CO 2 converting material (also referred to herein as a CO 2 converted material).

The CO 2 absorbing material (C abs ) may include one selected from a metal, a metal oxide, a metal carbonate, a metal bicarbonate, and a combination thereof.

The metal may include one selected from an alkali metal, an alkaline-earth metal, a rare earth element, a transition element, and a combination thereof.

For example, the CO 2 absorbing material (C abs ) may include one selected from Sr, Mn, Mg, Li, Zn, K, Ca, Ag, Cs, Na, Fe, Ba, Cu, oxides thereof, carbonates thereof, bicarbonates thereof, and a combination thereof.

The reducing material may include one selected from hydrogen, a substituted or unsubstituted C1 to C30 aliphatic hydrocarbon, a substituted or unsubstituted C3 to C30 alicyclic hydrocarbon, a substituted or unsubstituted C6 to C30 aromatic hydrocarbon, a substituted or unsubstituted C1 to C30 alcohol, ammonia, and a combination thereof.

The method of converting CO 2 may further include adding a catalyst to provide a CO 2 converting material. The catalyst may include one selected from Fe, Co, Cu, Ni, Ru, Pt, Ir, Pd, Al, Ga, Mn, Si, Zr, and a combination thereof.

The CO 2 absorbing material (C abs ) may further include a catalyst, and the catalyst may be the same as described above.

The CO 2 converting material obtained from the CO 2 conversion method may include one selected from the group consisting of: a synthesis gas including hydrogen and carbon monoxide; a chemical fuel including one selected from a substituted or unsubstituted C1 to C30 alcohol, a substituted or unsubstituted C2 to C30 ether, a substituted or unsubstituted C1 to C30 aliphatic hydrocarbon, a substituted or unsubstituted C3 to C30 alicyclic hydrocarbon, a substituted or unsubstituted C6 to C30 aromatic hydrocarbon, a substituted or unsubstituted C1 to C30 organic acid, urea, derivatives thereof, and a combination thereof; and a combination thereof.

For example, the CO 2 converting material may include one selected from the group consisting of: a synthesis gas including hydrogen and carbon monoxide; a chemical fuel including one selected from methane, methanol, dimethylether (DME), diesel, formic acid, acetic acid, formaldehyde, an olefin, a paraffin, dimethylcarbonate (DMC), urea, and a combination thereof; and a combination thereof.

According to another non-limiting embodiment, a device may be configured to perform the CO 2 conversion method.

According to another non-limiting embodiment, a method of capturing and converting CO 2 may include preparing a CO 2 absorbing material (C abs ), mixing the CO 2 absorbing material (C abs ) with a flue gas including CO 2 to provide a reducing material reforming agent including one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof, and mixing the reducing material reforming agent with a reducing material to provide a CO 2 converting material.

The CO 2 absorbing material (C abs ) may include one selected from a metal, a metal oxide, a metal carbonate, a metal bicarbonate, and a combination thereof.

In the method of capturing and converting CO 2 , the step of mixing the CO 2 absorbing material (C abs ) with the CO 2 -included flue gas to provide a reducing material reforming agent including one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof and the step of mixing the reducing material reforming agent with a reducing material to provide a CO 2 converting material may be simultaneously performed. The CO 2 absorbing material (C abs ) regenerated during the step of providing the CO 2 converting material may be recycled for use in forming an additional reducing material reforming agent including one selected from a reaction product of the CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof. The additional reducing material reforming agent may then be recycled for use in providing an additional CO 2 converting material.

The metal, the CO 2 absorbing material (C abs ), the reducing material, and the CO 2 converting material may be the same as described above.

The CO 2 absorbing material (C abs ) may further include a catalyst, and the catalyst may be the same as described above.

The CO 2 absorbing material (C abs ) may be mixed at about 1 mole or more per about 1 mole of CO 2 included in the flue gas.

The method of capturing and converting CO 2 may further include adding a catalyst while providing the CO 2 converting material. The catalyst may be the same as described above.

According to another non-limiting embodiment, a device may be configured to perform the method of capturing and converting CO 2 .

FIG. 1 is a graph showing a material distribution according to temperature when CO 2 is captured and converted using MgO as a CO 2 absorbing material (C abs ) and CH 4 as a reducing material.

FIG. 2 is a graph showing a material distribution according to temperature when CO 2 is captured and converted using CaO as a CO 2 absorbing material (C abs ) and CH 4 as a reducing material.

The present disclosure will be described more fully hereinafter in the following detailed description, in which various non-limiting embodiments have been described. It should be understood that this disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As used herein, when a definition is not otherwise provided, the term “substituted” refers to one substituted with a substituent selected from the group consisting of a halogen (—F, —Cl, —Br, or —I), a hydroxy group, a nitro group, a cyano group, an amino group (NH 2 , NH(R 100 ) or N(R 102 )(R 102 ), wherein R 100 , R 101 , and R 102 are each independently a C1 to C10 alkyl group), an amidino group, a hydrazine group, a hydrazone group, a carboxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted haloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alicyclic organic group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted heteroaryl group, and a substituted or unsubstituted heterocycloalkyl group, instead of at least one hydrogen of a functional group.

As used herein, when a definition is not otherwise provided, the term “aliphatic hydrocarbon” may refer to a C1 to C30 alkane, a C2 to C30 alkene, or a C2 to C30 alkyne, specifically a C1 to C15 alkane, a C2 to C15 alkene, or a C2 to C15 alkyne, the term “alicyclic hydrocarbon” may refer to a C3 to C30 cycloalkane, a C3 to C30 cycloalkene, or a C3 to C30 cycloalkyne, specifically a C3 to C15 cycloalkane, a C3 to C15 cycloalkene, or a C3 to C15 cycloalkyne, and the term “aromatic hydrocarbon” may refer to a C6 to C30 aromatic hydrocarbon, specifically a C6 to C20 aromatic hydrocarbon.

According to a non-limiting embodiment, a method of converting CO 2 may include mixing a reducing material reforming agent (also referred to as a reforming agent) including one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof with a reducing material to provide a CO 2 converting material. The CO 2 absorbing material (C abs ), which is a material capable of capturing CO 2 , may include one selected from a metal, a metal oxide, a metal carbonate, a metal bicarbonate, and a combination thereof.

The metal may include one selected from an alkali metal, an alkaline-earth metal, a rare earth element, a transition element, and a combination thereof. For example, the alkali metal may include one selected from Li, Na, K, Rb, Cs, Fr, and a combination thereof. The alkaline-earth metal may include one selected from Be, Mg, Ca, Sr, Ba, Ra, and a combination thereof. The rare earth element may include one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and a combination thereof. The transition element may include one selected from Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Ac, and a combination thereof.

The CO 2 absorbing material (C abs ) may include one selected from Sr, Mn, Mg, Li, Zn, K, Ca, Ag, Cs, Na, Fe, Ba, Cu, oxides thereof, carbonates thereof, bicarbonates thereof, and a combination thereof, but is not limited thereto.

For example, the CO 2 absorbing material (C abs ) may include one selected from Fe, Ag, Cu, CaO, MgO, ZnO, K 2 CO 3 , NaO, Na 2 O, LiO, FeO, BaO, SrO, MnO, Mn 2 O 3 , Mn 3 O 4 , CuO, Ag 2 O, AgO, and a combination thereof, but is not limited thereto.

The CO 2 absorbing material (C abs ) may further include a catalyst. For example, the catalyst may be included by doping the CO 2 absorbing material (C abs ), by substituting one or more atoms in a crystal lattice of the CO 2 absorbing material (C abs ), or by disposing the catalyst so as to be supported on the surface of the CO 2 absorbing material (C abs ), but is not limited thereto.

The catalyst may accelerate decomposition of the reducing material to form a CO 2 converting material (also referred to as a CO 2 converted material). For example, the catalyst may include one selected from Fe, Co, Cu, Ni, Ru, Pt, Ir, Pd, Al, Ga, Mn, Si, Zr and a combination thereof, but is not limited thereto.

The reducing material reforming agent includes one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof. The reforming agent may be used for modifying a reducing material to provide a CO 2 converting material.

The reducing material reforming agent may include one selected from a carbonate, a bicarbonate, and a combination thereof, but is not limited thereto. For example, the carbonate may include one selected from MgCO 3 , Mg(CO 3 ) 2 , CaCO 3 , KCO 3 , K 2 CO 3 , NaCO 3 , Na 2 CO 3 , LiCO 3 , Li 2 CO 3 , FeCO 3 , CuCO 3 , Ag 2 CO 3 , BaCO 3 , SrCO 3 , MnCO 3 , Mn(CO 3 ) 2 , and a combination thereof, but is not limited thereto. The bicarbonate may include one selected from KHCO 3 , NaHCO 3 , and a combination thereof, but is not limited thereto.

When the CO 2 absorbing material (C abs ) may include a catalyst, the reducing material reforming agent may also include a catalyst. For example, the catalyst may be included by doping the reducing material reforming agent, by substituting one or more atoms in a crystal lattice of the reducing material reforming agent, or by disposing the catalyst so as to be supported on the surface of the reducing material reforming agent, but is not limited thereto.

A reducing material for forming the CO 2 converting material may include one selected from hydrogen (H 2 ), a substituted or unsubstituted C1 to C30 aliphatic hydrocarbon (e.g., such as methane), a substituted or unsubstituted C3 to C30 alicyclic hydrocarbon, a substituted or unsubstituted C6 to C30 aromatic hydrocarbon, a substituted or unsubstituted C1 to C30 alcohol (e.g., such as methanol), ammonia, and a combination thereof, but is not limited thereto. The kind and the amount of the reducing material may be adjusted depending upon the kind of CO 2 converting material to be obtained.

While providing a CO 2 converting material, a catalyst may be further added, and the catalyst may be the same as described above.

When a catalyst is added in the step of providing a CO 2 converting material, the reducing material reforming agent may include the catalyst. Thereby, a CO 2 converting material may be effectively formed by reacting the reducing material reforming agent including the catalyst with a reducing material. For example, the catalyst may be included by doping the reducing material reforming agent, by substituting one or more atoms in a crystal lattice of the reducing material reforming agent, or by disposing the catalyst so as to be supported on the surface of the reducing material reforming agent, but is not limited thereto. However, the step of providing a CO 2 converting material is not limited to the procedures described above. The catalyst added in providing a CO 2 converting material may be omitted in the reducing material reforming agent and may take part in providing a CO 2 converting material.

A CO 2 converting material that is obtained from the CO 2 conversion method may include one selected from the group consisting of: a synthesis gas including hydrogen and carbon monoxide; a chemical fuel including one selected from a substituted or unsubstituted C1 to C30 alcohol, a substituted or unsubstituted C2 to C30 ether, a substituted or unsubstituted C1 to C30 aliphatic hydrocarbon, a substituted or unsubstituted C3 to C30 alicyclic hydrocarbon, a substituted or unsubstituted C6 to C30 aromatic hydrocarbon, a substituted or unsubstituted C1 to C30 organic acid, urea, derivatives thereof, and a combination thereof; and a combination thereof, but is not limited thereto.

For example, the CO 2 converting material may include one selected from the group consisting of: a synthesis gas including hydrogen and carbon monoxide; a chemical fuel including one selected from a substituted or unsubstituted C1 to C15 alcohol, a substituted or unsubstituted C2 to C15 ether, a substituted or unsubstituted C1 to C15 aliphatic hydrocarbon, a substituted or unsubstituted C3 to C15 alicyclic hydrocarbon, a substituted or unsubstituted C6 to C20 aromatic hydrocarbon, a substituted or unsubstituted C1 to C15 organic acid, urea, derivatives thereof, and a combination thereof; and a combination thereof, but is not limited thereto.

In a further example, the CO 2 converting material may include one selected from the group consisting of: a synthesis gas including hydrogen and carbon monoxide; a chemical fuel including one selected from methane, methanol, dimethylether (DME), diesel, formic acid, acetic acid, formaldehyde, an olefin, a paraffin, dimethylcarbonate (DMC), urea, and a combination thereof; and a combination thereof, but is not limited thereto.

According to another non-limiting embodiment, a device for performing the CO 2 conversion method is provided, and the device may be fabricated in various ways. For example, the device may include a CO 2 converter, a plant, a power generator, or the like, but is not limited thereto.

The method of capturing and converting CO 2 according to another non-limiting embodiment may include preparing a CO 2 absorbing material (C abs ), mixing the CO 2 absorbing material (C abs ) with a flue gas including CO 2 to provide a reducing material reforming agent including one selected from a reaction product of a CO 2 absorbing material (C abs ) and CO 2 , a reaction product of a CO 2 absorbing material (C abs ), CO 2 , and H 2 O, and a combination thereof, and mixing the reducing material reforming agent with a reducing material to provide a CO 2 converting material. The CO 2 absorbing material (C abs ), which is a material capable of capturing CO 2 , may include one selected from a metal, a metal oxide, a metal carbonate, a metal bicarbonate, and a combination thereof.

The CO 2 absorbing material (C abs ), the metal, the reducing material reforming agent, the reducing material, and the CO 2 converting material may be the same as described above.

According to the method of capturing and converting CO 2 , the flue gas may be directly mixed with the reducing material after capturing the CO 2 and without separating the CO 2 to provide a CO 2 converting material. After capturing the CO 2 , the CO 2 -removed flue gas is discharged to the outside of a reactor. Thereby, the CO 2 capture and the CO 2 conversion may be simultaneously performed, which may improve efficiency and save costs.

In addition, in the CO 2 capture and conversion method, CO 2 may become a CO 2 converting material (also referred to as a CO 2 converted material) from the reducing material reforming agent while providing a CO 2 converting material, and the CO 2 absorbing material (C abs ) may be regenerated. The regenerated CO 2 absorbing material (C abs ) may be mixed with the flue gas including CO 2 to be recycled for providing a reducing material reforming agent. In other words, the CO 2 absorbing material (C abs ) regenerated from the step of providing a CO 2 converting material may be recycled for providing a reducing material reforming agent, and the reducing material reforming agent may be recycled for providing a CO 2 converting material. According to the CO 2 capture and conversion method, additional CO 2 absorbing material (C abs ) may not be needed because of the regeneration, and the step of mixing the CO 2 absorbing material (C abs ) with the flue gas including CO 2 to provide a reducing material reforming agent may be simultaneously performed with the step of mixing the reducing material reforming agent with a reducing material to provide a CO 2 converting material, which may simplify the process and effectively improve the economics.

However, without being limited thereto, the CO 2 capture and conversion method may be further include supplying a CO 2 absorbing material (C abs ), if required.

The CO 2 absorbing material (C abs ) may further include a catalyst. For example, the catalyst may be included by doping the CO 2 absorbing material (C abs ), by substituting one or more atoms in a crystal lattice of the CO 2 absorbing material (C abs ), or by disposing the catalyst so as to be supported on the surface of the CO 2 absorbing material (C abs ), but is not limited thereto.

The catalyst and when the CO 2 absorbing material (C abs ) may further include a catalyst may be the same as described above.

In the CO 2 capture and conversion method, the CO 2 absorbing material (C abs ) may be added at about 1 mole or more per about 1 mole of CO 2 included in the flue gas. When the CO 2 absorbing material (C abs ) is mixed within this range, it may effectively capture the CO 2 included in the flue gas.

While providing a CO 2 converting material, a catalyst may be further added. The catalyst and when a catalyst is further added in the step of providing a CO 2 converting material may be the same as described above.

According to another non-limiting embodiment, a device for performing the CO 2 capture and conversion method is provided, and the device may be manufactured in various forms. For example, the device may include a CO 2 capturer and converter, a plant, a power generator, or the like, but is not limited thereto. Hereinafter, the CO 2 capture and conversion method according to various embodiments is described with reference to the following examples. However, the CO 2 capture and conversion method according to the various example embodiments is not limited thereto.

As an example, MgO may be used as the CO 2 absorbing material (C abs ), and CH 4 may be used as the reducing material. In this case, the MgO is mixed with the flue gas including CO 2 to perform a reaction according to the following Reaction Scheme 1 to provide a reducing material reforming agent of MgCO 3 . Thereby, CO 2 may be captured according to the following Reaction Scheme 1.

The provided MgCO 3 is mixed with a reducing material of CH 4 and reacted according to the following Reaction Scheme 2 to provide a synthesis gas including hydrogen and carbon monoxide. Thus, the CO 2 converted material may include regenerated MgO(s) and the synthesis gas (CO(g) and H 2 (g)).

The regenerated MgO(s) may be recycled for use as a starting material in Reaction Scheme 1.

FIG. 1 is a graph showing a material distribution according to temperature which confirms that the reaction is performed according to Reaction Scheme 2. As shown in FIG. 1 , when about 1 mole of MgCO 3 (s) is reacted with about 1 mole of CH 4 (g), the reaction provides about 1 mole of MgO(s), about 2 moles of CO(g), and about 2 moles of H 2 (g).

As another example, CaO may be used as a CO 2 absorbing material (C abs ), and CH 4 may be used as a reducing material. In this case, the CaO is mixed with flue gas including CO 2 and reacted according to the following Reaction Scheme 3 to provide a reducing material reforming agent of CaCO 3 . Thereby, CO 2 may be captured according to the following Reaction Scheme 3.

The provided CaCO 3 is mixed with a reducing material of CH 4 and reacted according to the following Reaction Scheme 4 to provide a synthesis gas including hydrogen and carbon monoxide. Thus, the CO 2 converted material may include regenerated CaO(s) and the synthesis gas (CO(g) and H 2 (g)).

The regenerated CaO(s) may be recycled for use as a starting material in Reaction Scheme 3.

FIG. 2 is a graph showing a material distribution according to temperature which confirms that the reaction is performed according to Reaction Scheme 4. As shown in FIG. 2 , when about 1 mole of CaCO 3 (s) is reacted with about 1 mole of CH 4 (g), the reaction provides about 1 mole of CaO(s), about 2 moles of CO(g), and about 2 moles of H 2 (g).

As another example, K 2 CO 3 may be used as a CO 2 absorbing material (C abs ), and CH 4 may be used as a reducing material. In this case, the K 2 CO 3 is mixed with flue gas including CO 2 and reacted according to the following Reaction Scheme 5 to provide a reducing material reforming agent of KHCO 3 . Thereby, CO 2 may be captured according to the following Reaction Scheme 5.

The provided KHCO 3 is mixed with a reducing material of CH 4 and reacted according to the following Reaction Scheme 6 to provide a synthesis gas including hydrogen and carbon monoxide. Thus, the CO 2 converted material may include regenerated K 2 CO 3 (s) and the synthesis gas (CO(g) and H 2 (g)).

The regenerated K 2 CO 3 (s) may be recycled for us as a starting material in Reaction Scheme 5.

From the examples, it is confirmed that the method of capturing and converting CO 2 may be simplified and economically improved in an effective way since the additional CO 2 absorbing material (C abs ) is not added, and the step of mixing the CO 2 absorbing material (C abs ) with the flue gas including CO 2 to provide a reducing material reforming agent is simultaneously performed with the step of mixing the reducing material reforming agent with a reducing material to provide a CO 2 converting material (also referred to herein as a CO 2 converted material).

Hereinafter, this disclosure is discussed in more detail with reference to the following examples. However, it should be understood that these are merely example embodiments and should not be construed as limiting.

Performance of CO 2 Capturing Reaction and Converting Reaction (using Ru—MgO)

A CO 2 capturing reaction using Ru—MgO which is an Ru-included CO 2 absorbing material, and subsequently a CO 2 converting reaction using Ru—MgCO 3 which is a reducing material reforming agent obtained from the CO 2 capturing reaction are performed in series. For such continuous reactions, an ½ inch-straight type quartz reactor is equipped in an electric furnace, and a reactant is allowed to continuously pass through the Ru-included CO 2 absorbing material Ru—MgO or the reducing material reforming agent Ru—MgCO 3 layer in the reactor while maintaining a constant reaction temperature using a temperature controller. The amounts of carbon dioxide, methane, and nitrogen used in the reactions are controlled by using a mass flow controller.

Specifically, the quartz reactor is filled with 0.5 g of Ru—MgO prior to the CO 2 capturing reaction, and then the quartz reactor is heated up to 200° C. under a nitrogen atmosphere to remove impurities from the surface of Ru—MgO and to activate Ru—MgO. For the CO 2 capturing reaction, a reaction temperature is fixed at 200° C. while maintaining a molar ratio of CO 2 :N 2 to be 0.4:0.6, and adjusting a space velocity at 24,000 ml/h·g. As a result, referring to the following Table 1, CO 2 15.0 parts by weight based on 100 parts by weight of the filled Ru—MgO is captured to provide a reducing material reforming agent Ru—MgCO 3 .

For the CO 2 converting reaction to occur in series subsequent to the CO 2 capturing reaction, the reactor completed with the CO 2 capturing reaction is heated up to 500° C., and then a reducing material of CH 4 diluted with nitrogen is injected into the reactor. For the CO 2 converting reaction, a reaction temperature is fixed at 500° C. while maintaining a molar ratio of CH 4 :N 2 to be 0.5:0.5, and adjusting a space velocity at 24,000 ml/h·g. As a result, referring to the following Table 1, a conversion rate of CH 4 is 13.8%. From the synthesis of a CO 2 converting material including hydrogen and carbon monoxide in the form of gas, as well as the re-conversion of a reducing material reforming agent Ru—MgCO 3 into a CO 2 absorbing material Ru—MgO, it is confirmed that a CO 2 capturing reaction and a CO 2 converting reaction occur in series.

Performance of CO 2 Capturing Reaction and Converting Reaction (using Ru—CaO)

A CO 2 capturing reaction using an Ru-included CO 2 absorbing material Ru—CaO, and a CO 2 converting reaction using a reducing material reforming agent of Ru—CaCO 3 obtained from the CO 2 capturing reaction are performed in series. The CO 2 capturing reaction and CO 2 converting reaction were performed according to the same method as discussed in Example 1 except the temperature of the CO 2 capturing reaction was maintained at 500° C. and the temperature of the CO 2 converting reaction was maintained at 800° C.

As a result, referring to the following Table 1, CO 2 44.2 parts by weight based on 100 parts by weight of the filled Ru—CaO is captured to provide a reducing material reforming agent Ru—CaCO 3 . Also, as a result of the CO 2 converting reaction, referring to the following Table 1, a conversion rate of CH 4 is 85.4%. From the synthesis of a CO 2 converting material including hydrogen and carbon monoxide in the form of gas, as well as the re-conversion of a reducing material reforming agent Ru—CaCO 3 into a CO 2 absorbing material Ru—CaO, it is confirmed that a CO 2 capturing reaction and a CO 2 converting reaction occur in series.

Referring to Table 1, it is confirmed that a CO 2 capturing reaction and a CO 2 converting reaction may be continuously performed, and improved efficiencies of CO 2 capturing and CO2 converting may be achieved according to Examples 1 and 2.

While this disclosure has been described in connection with various embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.