Catalysts for retaining and converting carbon dioxide.

Abstract

The invention relates to a catalyst for carbon dioxide retention and conversion capable of removing carbon dioxide and converting it into other useful materials simultaneously by retaining and converting carbon dioxide in flue gases produced during the combustion of fossil fuels into carbon resources. The carbon dioxide retention and conversion catalyst of the invention can remove carbon dioxide by retaining carbon dioxide in flue gases produced during the combustion of fossil fuels. The retained carbon dioxide can be converted into other useful materials by converting the collected carbon dioxide into sodium carbonate or sodium bicarbonate as carbon resources.

Description

Carbon dioxide capture and conversion catalyst

[0001] The present invention relates to a carbon dioxide capture and conversion catalyst that can capture and convert carbon dioxide in exhaust gas generated during fossil fuel combustion into a carbon resource, thereby removing carbon dioxide and simultaneously converting it into other useful substances.

[0002] The Earth's climate change is periodically displayed through glacial and interglacial periods due to changes in the Earth's orbit, the cycle of changes in the angle of the Earth's rotation axis, the cycle of precession, and the amount of solar radiation. The temperature rises by 1℃ per 100 years when transitioning from an glacial period to an interglacial period. However, in recent years, the average temperature rise has been 0.74℃ per 100 years, which is 7 times higher than the temperature rise due to natural phenomena, and it can be seen that this is due to anthropogenic phenomena caused by human activities. It is predicted that global warming will bring about great disasters to humanity by disrupting the Earth's ecosystem, such as sea level rise, famine, outbreak of diseases such as malaria, and water shortages as the Earth's temperature rises.

[0003] Carbon dioxide, in particular, is designated as a greenhouse gas contributing to global warming. While its global warming potential is relatively low compared to other greenhouse gases, it accounts for 80% of total greenhouse gas emissions, making it significant because emissions can be regulated. Consequently, the International Maritime Organization (IMO) has decided to introduce the Energy Efficiency Design Index (EEDI) for new ships, requiring an average 30% reduction in greenhouse gas emissions by 2025.

[0004] Accordingly, carbon dioxide capture and storage (CCS) technology is being actively studied as an alternative to reducing carbon dioxide emissions, which account for the majority of greenhouse gases causing global warming, in accordance with the Climate Change Convention to prevent global warming.

[0005] Carbon dioxide Capture and Storage (CCS) technology captures, transports, and stores or converts greenhouse gases emitted from fossil fuel combustion. This technology effectively reduces CO2 emissions and is considered a viable bridging technology until renewable energy becomes economically viable.

[0006] CCS is primarily used to reduce carbon dioxide emissions from coal and gas-fired power generation, but it is also applied to carbon-intensive industries such as cement, steel, petrochemicals, and oil and gas production. Other storage methods include geological storage, ocean storage, and mineral storage. However, ocean storage is currently prohibited due to concerns about high environmental risks. Mineral storage is currently a topic of research, but further technological advancements are needed, including improvements in energy use reduction and large-scale reduction technologies.

[0007] Furthermore, the most effective method for removing carbon dioxide from gases containing carbon dioxide, such as gas mixtures generated in hydrogen, steel, and cement production processes, combustion exhaust gases from fossil fuel-burning power plants, and natural gas, is chemical absorption using aqueous amine solutions. Among chemical absorbents, aqueous amine solutions such as monoethanolamine (MEA) and diethanolamine (DEA) are the most widely studied. This is because these amine absorbents readily react with carbon dioxide to form stable carbamate compounds, and these compounds can be decomposed into carbon dioxide and amines by heat, allowing the alkanolamine absorbent to be regenerated.

[0008] However, this process presents several serious problems, in particular, the performance of the absorbent deteriorates due to the generation and decomposition of by-products caused by impurities such as NOx, SOx, and oxygen contained in the combustion exhaust gas, and the resulting corrosion of the device; the problem of excessive regeneration energy consumption due to the high thermal and chemical stability of the carbamate generated from the reaction with carbon dioxide, which causes the regeneration temperature to be higher than 120℃; the problem of excessive volatilization loss of alkanolamine due to the high regeneration temperature, and the problem of absorbent replenishment resulting from this; and the problem of contamination of the carbon dioxide separated during the regeneration process due to the low vapor pressure of the absorbent.

[0009] Therefore, it is necessary to develop a catalyst for stable carbon dioxide removal that is not affected by impurities other than carbon dioxide contained in combustion exhaust gas and does not consume excessive renewable energy.

[0010] The present invention aims to provide a carbon dioxide capture and conversion catalyst capable of removing carbon dioxide and simultaneously converting it into other useful substances by capturing carbon dioxide in exhaust gas generated during fossil fuel combustion and converting it into a carbon resource.

[0011] In order to solve the above problem, the present invention provides a method for producing a carbon dioxide capture and conversion catalyst, comprising the steps of: (a) finely pulverizing oxide powder and metal powder, respectively, to produce oxide fine powder and metal fine powder; (b) introducing an alumina-based raw material, a silica-based raw material, and sodium hydroxide into a reactor to produce a crystallized synthetic zeolite; (c) introducing the oxide fine powder into the crystallized synthetic zeolite at regular intervals, stirring, and then mixing with a first alkaline solution; (d) mixing a second alkaline solution into the mixture of step (c), then introducing the metal fine powder at regular intervals, stirring, and then; and (e) mixing a third alkaline solution into the mixture of step (d), then stabilizing, and extracting only a liquid portion to obtain a carbon dioxide capture and conversion catalyst.

[0012] The above oxide powder and the above metal powder may have an average size of 0.5 to 5 μm.

[0013] The above step (b) may be to produce a crystallized synthetic zeolite by adding alumina-based raw material, silica-based raw material, and sodium hydroxide to a reactor and stirring at 30 to 70°C for 1 to 10 hours.

[0014] In the above steps (c) and (d), the injection at regular time intervals may be done by distributing the fixed injection amount at intervals of 1 to 10 minutes.

[0015] In the above step (e), the third alkaline solution may be mixed, naturally cooled, and stabilized for 40 to 50 hours to separate into a liquid composition and a precipitated powder composition.

[0016] The above oxide powder may include at least one selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3.

[0017] The above metal powder may include at least one selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb.

[0018] The above alumina-based raw material may be sodium aluminate (NaAl(OH)4), and the above silica-based raw material may be sodium silicate (Na2SiO3).

[0019] The first, second and third alkaline solutions may each independently include at least one selected from the group consisting of potassium hydroxide (KOH), sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), hydrogen peroxide (H2O2) and combinations thereof.

[0020] In addition, the present invention provides, in one embodiment, a carbon dioxide capture and conversion catalyst manufactured according to the method for manufacturing the carbon dioxide capture and conversion catalyst, comprising: at least one oxide selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3; at least one metal selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb; a crystallized synthetic zeolite manufactured from an alumina-based raw material, a silica-based raw material, and sodium hydroxide; and at least one alkaline solution selected from the group consisting of potassium hydroxide (KOH), sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), hydrogen peroxide (H2O2), and combinations thereof.

[0021] The oxide comprises 15 to 90 parts by weight of SiO2, 15 to 100 parts by weight of Al2O3, 10 to 50 parts by weight of Fe2O3, 5 to 15 parts by weight of TiO2, 20 to 150 parts by weight of MgO, 10 to 20 parts by weight of MnO, 20 to 200 parts by weight of CaO, 15 to 45 parts by weight of Na2O, 20 to 50 parts by weight of K2O, and 5 to 20 parts by weight of P2O3, and the metal comprises 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, and 0.04 to 0.08 parts by weight of Sr, 0.02 to 0.05 parts by weight of Cd, and 0.003 to 0.005 parts by weight of Pb, the zeolite may contain 75 to 420 parts by weight, and the alkaline solution may contain 15 to 120 parts by weight of potassium hydroxide (KOH), 20 to 130 parts by weight of sodium tetraborate (Na2B4O7·10H2O), 15 to 120 parts by weight of sodium hydroxide (NaOH), 50 to 250 parts by weight of sodium silicate (Na2SiO3), and 10 to 50 parts by weight of hydrogen peroxide (H2O2).

[0022] The above carbon dioxide capture conversion catalyst may capture 0.3 to 0.5 kg / h of carbon dioxide per 1 kg.

[0023] The pH of the above carbon dioxide capture conversion catalyst may be pH 12 to 14.

[0024] The present invention is a method for manufacturing a carbon dioxide capture and conversion catalyst capable of capturing carbon dioxide and simultaneously converting it into sodium carbonate or sodium bicarbonate (sodium hydrogen carbonate) to remove carbon dioxide.

[0025] The carbon dioxide capture and conversion catalyst according to the present invention can reduce carbon dioxide by capturing carbon dioxide in exhaust gas generated when fossil fuels are burned, and can utilize the captured carbon dioxide to carbonize it into sodium carbonate or sodium bicarbonate, thereby enabling resource utilization into other useful materials.

[0026] In addition, the carbon dioxide capture and conversion catalyst according to the present invention can also be used as a desulfurization agent that captures sulfur oxides in exhaust gas generated during fossil fuel combustion by utilizing sodium carbonate or sodium bicarbonate manufactured from captured carbon dioxide, so that both carbon dioxide and sulfur oxides can be removed with a single catalyst.

[0027] Figure 1(a) shows the carbon dioxide capture test results (scrubber data before carbon dioxide capture) of the carbon dioxide capture conversion catalyst according to the present embodiment.

[0028] Figure 1(b) shows the carbon dioxide capture test results (scrubber data after carbon dioxide capture) of the carbon dioxide capture conversion catalyst according to this embodiment.

[0029] Figure 1(c) shows the carbon dioxide capture test results (carbon dioxide capture saturation test results) of the carbon dioxide capture conversion catalyst according to this example.

[0030] Figure 2 shows the results of carbon dioxide capture tests according to Comparative Examples 1 and 2 in this embodiment.

[0031] The present invention may have various modifications and embodiments, and specific embodiments are illustrated in the drawings and specifically described in the detailed description.

[0032] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0033] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0034] Hereinafter, the present invention will be described in detail.

[0035] The present invention provides a method for producing a carbon dioxide capture and conversion catalyst, comprising the steps of: (a) finely pulverizing oxide powder and metal powder, respectively, to produce oxide fine powder and metal fine powder; (b) introducing alumina-based raw material, silica-based raw material, and sodium hydroxide into a reactor to produce a crystallized synthetic zeolite; (c) introducing the oxide fine powder into the crystallized synthetic zeolite at regular intervals, stirring, and then mixing with a first alkaline solution; (d) mixing a second alkaline solution into the mixture of step (c), then introducing the metal fine powder at regular intervals, stirring, and then; and (e) mixing a third alkaline solution into the mixture of step (d), then stabilizing, and then extracting only a liquid portion to obtain a carbon dioxide capture and conversion catalyst.

[0036] The carbon dioxide capture and conversion catalyst manufactured according to the manufacturing method of the present invention can reduce carbon dioxide by capturing carbon dioxide in exhaust gas generated when fossil fuels are burned, and can utilize the captured carbon dioxide to carbonize it into sodium carbonate or sodium bicarbonate, thereby making it possible to utilize it as a resource for other useful materials.

[0037] In addition, the carbon dioxide capture and conversion catalyst according to the present invention can also be used as a desulfurization agent that captures sulfur oxides in exhaust gas generated during fossil fuel combustion by utilizing sodium carbonate or sodium bicarbonate manufactured from captured carbon dioxide, so that both carbon dioxide and sulfur oxides can be removed with a single catalyst.

[0038] Specifically, the method for manufacturing the carbon dioxide capture conversion catalyst of the present invention may be such that, in step (a), the oxide powder is melted in a furnace under conditions of 3 to 12 bar and 600 to 1,500°C for 0.5 to 10 hours, cooled to room temperature, and then finely ground with a fine mill to manufacture an oxide fine powder.

[0039] The above oxide powder may include at least one selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3.

[0040] The above metal powder may include at least one selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb. The metal powder may be mixed and finely ground by a fine mill to produce a metal fine powder.

[0041] The above oxide fine powder and the metal fine powder may have an average size of 0.5 to 5 μm. For example, the oxide fine powder and the metal fine powder may have an average size of 0.5 to 4 μm, 0.5 to 3 μm, 0.5 to 2 μm, 0.5 to 1 μm, 1 to 5 μm, 2 to 5 μm, 3 to 5 μm, or 1 to 2 μm. When finely dividing the oxide fine powder and the metal fine powder, finely dividing may be repeatedly performed until the above size is satisfied.

[0042] The above step (b) may be to manufacture a crystallized synthetic zeolite by adding water, alumina-based raw material, silica-based raw material, and sodium hydroxide to a reactor and stirring at 30 to 70°C for 1 to 10 hours.

[0043] The above alumina-based raw material may be sodium aluminate (NaAl(OH)4), and the above silica-based raw material may be sodium silicate (Na2SiO3).

[0044] In the above step (c), the oxide powder may be added to the crystallized synthetic zeolite in units of 100 kg at regular time intervals, stirred, and then mixed with the first alkaline solution.

[0045] In the above step (c), the injection at regular time intervals may be done by distributing the fixed injection amount at 1 to 10 minute intervals and mixing. For example, the time interval may be 5 minutes.

[0046] The above step (d) may be performed by mixing a second alkaline solution into the mixture of the above step (c), and then adding and stirring the metal powder in units of 20 g at regular time intervals.

[0047] In the above step (d), the injection at regular time intervals may be done by distributing the fixed injection amount at intervals of 1 to 10 minutes and mixing. For example, the time interval may be 3 minutes.

[0048] The above step (e) may be performed by mixing a third alkaline solution into the mixture of the above step (d), naturally cooling it, and stabilizing it for 40 to 50 hours to separate it into a liquid composition and a precipitated powder composition, and extracting only the liquid composition portion, which is the supernatant, to obtain a carbon dioxide capture conversion catalyst.

[0049] The first, second and third alkaline solutions may each independently include at least one selected from the group consisting of potassium hydroxide (KOH), sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), hydrogen peroxide (H2O2) and combinations thereof.

[0050] For example, the first alkaline solution may include potassium hydroxide (KOH), sodium tetraborate (Na2B4O7·10H2O), and sodium hydroxide (NaOH).

[0051] For example, the second alkaline solution may include sodium silicate (Na2SiO3).

[0052] For example, the third alkaline solution may contain hydrogen peroxide (H2O2).

[0053] In addition, a carbon dioxide capture and conversion catalyst is provided, which is manufactured according to the method for manufacturing the carbon dioxide capture and conversion catalyst, and which comprises at least one oxide selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3; at least one metal selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb; a crystallized synthetic zeolite manufactured from an alumina-based raw material, a silica-based raw material, and sodium hydroxide; and at least one alkaline solution selected from the group consisting of potassium hydroxide (KOH), sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), hydrogen peroxide (H2O2), and combinations thereof.

[0054] The carbon dioxide capture and conversion catalyst described above can improve carbon dioxide capture efficiency by including potassium hydroxide (KOH) as an alkaline solution. For example, by including potassium hydroxide in the carbon dioxide capture and conversion catalyst, the catalyst can exhibit a carbon dioxide capture efficiency that is approximately 2.5 to 4 times higher than when potassium hydroxide is not included.

[0055] The oxide comprises 15 to 90 parts by weight of SiO2, 15 to 100 parts by weight of Al2O3, 10 to 50 parts by weight of Fe2O3, 5 to 15 parts by weight of TiO2, 20 to 150 parts by weight of MgO, 10 to 20 parts by weight of MnO, 20 to 200 parts by weight of CaO, 15 to 45 parts by weight of Na2O, 20 to 50 parts by weight of K2O, and 5 to 20 parts by weight of P2O3, and the metal comprises 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, and 0.04 to 0.08 parts by weight of Sr, 0.02 to 0.05 parts by weight of Cd, and 0.003 to 0.005 parts by weight of Pb, the zeolite may contain 75 to 420 parts by weight, and the alkaline solution may contain 15 to 120 parts by weight of potassium hydroxide (KOH), 20 to 130 parts by weight of sodium tetraborate (Na2B4O7·10H2O), 15 to 120 parts by weight of sodium hydroxide (NaOH), 50 to 250 parts by weight of sodium silicate (Na2SiO3), and 10 to 50 parts by weight of hydrogen peroxide (H2O2).

[0056] The above zeolite may be a crystallized synthetic zeolite prepared from 30 to 120 parts by weight of sodium aluminate (NaAl(OH)4), 30 to 200 parts by weight of sodium silicate (Na2SiO3), and 15 to 100 parts by weight of sodium hydroxide.

[0057] The above carbon dioxide capture conversion catalyst may have a carbon dioxide capture effect by forming a transition metal oxide with the oxide, the metal, and the alkaline solution to act as a catalyst of the following chemical formula.

[0058] Specifically, the metal includes transition metals, and the transition metals and the oxide can react in a reactor to form a transition metal oxide. The carbon dioxide capture and conversion catalyst may be the transition metal oxide, and the transition metal oxide acts as a positive catalyst, and contains NaOH and KOH that react with carbon dioxide, so that carbon dioxide can be captured.

[0059] NaOH and KOH contained in the above carbon dioxide capture and conversion catalyst may react as shown in the following reaction formula. Reaction formulas 1 (1-1, 1-2) and 2 below may occur in parallel, and by forming NaHCO3 and K2CO3 as final reactants, they may be converted into a material for carbon resource utilization.

[0060] That is, the carbon dioxide capture and conversion catalyst of the present invention can capture carbon dioxide and convert it into sodium carbonate, sodium bicarbonate (sodium hydrogen carbonate), or potassium carbonate, thereby removing carbon dioxide and converting it into a carbon resource.

[0061] [Reaction Formula 1-1] 2NaOH + CO2 → Na2CO3 + H2O

[0062] [Reaction Formula 1-2] Na2CO3 + H2O + CO2→ 2NaHCO3

[0063] [Reaction Formula 2] 2KOH + CO2 → K2CO3 + H2O

[0064] The carbon dioxide capture and conversion catalyst may capture 0.3 to 0.5 kg / h of carbon dioxide per kg. For example, the carbon dioxide capture and conversion catalyst may capture 0.3 to 0.45 kg / h, 0.3 to 0.4 kg / h, 0.3 to 0.35 kg / h, 0.35 to 0.5 kg / h, 0.4 to 0.5 kg / h, 0.45 to 0.5 kg / h, or 0.38 to 0.4 kg / h of carbon dioxide per kg of the carbon dioxide capture and conversion catalyst.

[0065] The carbon dioxide capture and conversion catalyst may be a basic solution, and may have an average pH of pH 12 to 14. For example, the carbon dioxide capture and conversion catalyst may have a pH of 12 to 13.5, pH 12 to 13, pH 12 to 12.5, pH 12 to 12.2, pH 12.2 to 14, pH 12.5 to 14, pH 13 to 14, or pH 13.5 to 14. The pH of the carbon dioxide capture and conversion catalyst may be an important indicator for determining the amount of catalyst to be introduced. Specifically, since the pH decreases as the carbon dioxide captures more carbon dioxide, the carbon dioxide capture and conversion catalyst may be additionally introduced when the pH drops below a certain standard.

[0066] The above carbon dioxide capture and conversion catalyst may be mixed with water when used. When mixing the carbon dioxide capture and conversion catalyst with water, the carbon dioxide capture rate may increase as the catalyst ratio increases. However, considering cost considerations, the mixing ratio with water may be adjusted.

[0067] The carbon dioxide capture conversion catalyst and water may be mixed in a ratio of 1:1 to 1:5. For example, the basic alkaline solution and water may be mixed in a ratio of 1:1 to 1:4, 1:1 to 1:3, 1:1 to 1:2, 1:2 to 1:5, 1:2 to 1:3, or 1:3 to 1:5.

[0068] The carbon dioxide capture and conversion catalyst according to the present invention may be used to remove carbon dioxide from exhaust gas emitted from a boiler, incinerator, engine, etc. of a ship, or from exhaust gas emitted from a thermal power plant, LNG, LPG, or fuel cell facility.

[0069] Hereinafter, the present invention will be described in more detail through examples according to the present invention, but the scope of the present invention is not limited by the examples presented below.

[0070] <Example>

[0071] In order to manufacture a carbon dioxide capture and conversion catalyst according to the present invention, first, oxides of SiO2 (150 kg), Al2O3 (150 kg), Fe2O3 (100 kg), TiO2 (50 kg), MgO (200 kg), MnO (100 kg), CaO (200 kg), Na2O (150 kg), K2O (200 kg), and P2O3 (50 kg) were mixed and melted in a furnace at 3 to 12 bar and 600 to 1,500°C for 0.5 to 10 hours, and then cooled to room temperature. This was then pulverized in a pulverizer to manufacture oxide fine powder.

[0072] Metals Li 35 g, Cr 50 g, Co 10 g, Ni 60 g, Cu 180 g, Zn 350 g, Ga 400 g, Sr 200 g, Cd 20 g, and Pb 30 g were mixed and finely ground in a mill to produce metal fine powder.

[0073] The above oxide fine powder and metal fine powder were repeatedly finely divided until the particle size became 1 to 2 μm.

[0074] 3,000 kg of water, 40 kg of sodium aluminate (NaAl(OH)4), 40 kg of NaSi3, and 25 kg of sodium hydroxide (NaOH) were charged into the reactor, and the mixture was stirred at a temperature of 30 to 70°C for 1 to 10 hours to produce a crystallized synthetic zeolite.

[0075] The previously finely divided oxide powder was fed into the reactor in 100 kg units at 5-minute intervals, and stirred for more than 2 hours. Then, 50 kg of sodium tetraborate (Na2B4O7·10H2O), 25 kg of sodium hydroxide (NaOH), and 50 kg of potassium hydroxide (KOH) were simultaneously fed and stirred for 30 minutes. While stirring, the temperature was raised to 40 to 80°C, and 100 kg of sodium silicate (Na2SiO3) was fed. After stirring for 30 minutes, the previously finely divided metal powder was fed in 20 g units at 3-minute intervals and stirred.

[0076] After stirring for 1 hour, 30 kg of hydrogen peroxide (H2O2) was added, stirred for another 30 minutes, and then naturally cooled for 1 hour. After cooling, the mixture was stabilized for 48 hours and separated into a liquid composition and a precipitated powder composition. By obtaining only the liquid composition, a carbon dioxide electrochemical conversion catalyst (named KLC) was manufactured.

[0077] In the method for producing a carbon dioxide capture and conversion catalyst (Example, KLC-20) according to the present invention, comparative examples 1 (KLC-11) and 2 (KLC-18) that do not contain potassium hydroxide (KOH) were produced.

[0078] <Experimental Example: Carbon Dioxide Capture Experiment>

[0079] The raw materials of the above-mentioned manufactured Example (KLC-20) and Comparative Examples 1 (KLC-11) and 2 (KLC-18) were charged into the tank of the K-Scrubber, and the exhaust gas pipe of a boiler (Miura GZ-300 boiler) using LPG as fuel was connected to the K-Scrubber. The exhaust gas emitted after combustion in the LPG boiler was passed through the K-Scrubber to conduct a carbon dioxide capture experiment.

[0080] The specifications of the above K-scrubber are as follows.

[0081] - Power consumption: 1.3 KW

[0082] - Residence time: 4 sec

[0083] - Solution used: 105.48 kg of KLC-20 stock solution (specific gravity: 1.466) = 72 L

[0084] - Scrubber operating time: 1 hour 35 minutes

[0085] The results of the above carbon dioxide capture experiment are shown in Fig. 1, Fig. 2 and Table 1.

[0086] Figure 1 shows the results of a carbon dioxide capture test of a carbon dioxide capture conversion catalyst according to the above embodiment, showing gas meter data. [(a) Scrubber data before carbon dioxide capture, (b) Scrubber data after carbon dioxide capture, and (c) carbon dioxide capture saturation test results]

[0087] Referring to Fig. 1, the results of the carbon dioxide capture experiment of the embodiment are as follows.

[0088] 1) CO2 capture efficiency of the example: approximately 20% (area comparison)

[0089] Solution used: Example 105.48 kg (specific gravity: 1.466) = 72 L

[0090] 2) Example: Calculating CO2 capture per kg

[0091] Total exhaust gas: 951.62 Nm 3 / h = 15.86 Nm 3 / min

[0092] CO2 10.98% of exhaust gas, capture efficiency: 20%, CO2 density: 1.977 (g / L)

[0093] Scrubber CO2 capture capacity: 951.62 Nm 3 / h×1000 L / Nm 3 ×0.1098×0.2×1.977 g / L

[0094] = 41,314.52 g / h = 41.31 kg / h

[0095] Example: Amount of CO2 captured per 1 kg: 0.392 kg / h (41.31 kg / 105.48 kg = 0.392 kg / h)

[0096] 3) After CO2 capture, pH: 12.2, specific gravity: 1.545

[0097] Figure 2 shows the results of carbon dioxide capture tests according to Comparative Examples 1 and 2.

[0098] Referring to Fig. 2, the capture rate per 1 kg of Comparative Example 1 was 0.135 (13.5%), the capture rate per 1 kg of Comparative Example 2 was 0.155 (15.5%), and when calculated based on 28 kg, the total capture amount of Comparative Example 1 was 3.78 kg (13.5%) and the total capture amount of Comparative Example 2 was 4.34 kg (15.5%).

[0099] Table 1 below shows the carbon dioxide capture amount per 1 kg of input for each of Examples 1 and 2.

[0100] [Table 1]

[0101]

[0102] Referring to the above [Table 1], it was confirmed that the example including KOH showed a carbon dioxide capture amount that was about 2.5 to 4 times higher than that of comparative examples 1 and 2 that did not include KOH.

[0103] In summary, the carbon dioxide capture conversion catalyst according to the example had a CO2 capture capacity of 0.392 kg / h per 1 kg, which was about 60% better than the carbon dioxide capture conversion catalyst according to the comparative example (CO2 capture capacities of 0.11 kg / h and 0.156 kg / h per 1 kg, respectively).

[0104] The present invention can be widely used in the field of carbon dioxide capture and conversion catalysts.

Claims

1. SiO 2 15 to 90 parts by weight, Al 2 O 3 15 to 100 parts by weight, Fe 2 O 3 10 to 50 parts by weight, TiO 2 5 to 15 parts by weight, MgO 20 to 150 parts by weight, MnO 10 to 20 parts by weight, CaO 20 to 200 parts by weight, Na 2 O 15 to 45 wt. parts, K 2 O 20 to 50 parts by weight and P 2 O 3 5 to 20 parts by weight of oxide; A metal of 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, 0.04 to 0.08 parts by weight of Ga, 0.02 to 0.05 parts by weight of Sr, 0.002 to 0.01 parts by weight of Cd, and 0.003 to 0.005 parts by weight of Pb; The zeolite is 75 to 420 parts by weight; and, Potassium hydroxide (KOH) 15 to 120 parts by weight, sodium tetraborate (Na 2 B 4 O 7 ·10H 2 O) 20 to 130 parts by weight, sodium hydroxide (NaOH) 15 to 120 parts by weight, sodium silicate (Na 2 SiO 3 ) 50 to 250 parts by weight and hydrogen peroxide (H 2 O 2 ) containing 10 to 50 parts by weight of an alkaline solution; A carbon dioxide capture conversion catalyst that improves carbon dioxide capture efficiency by including the above potassium hydroxide (KOH) as an alkaline solution.

2. In paragraph 1, The above carbon dioxide capture and conversion catalyst is a carbon dioxide capture and conversion catalyst characterized in that it captures carbon dioxide and simultaneously converts it into sodium carbonate or sodium bicarbonate (sodium bicarbonate) to remove carbon dioxide.

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