KR20100113445A - Ring type palladium nano structure body and the palladium nano structure catalyst for synthesis of hydrocarbon - Google Patents

Abstract

PURPOSE: A cyclic Pd nanostructure is provided to chemically control physical property and to apply to a Pd nanostructure catalyst for hydrocarbon compound synthesis. CONSTITUTION: A cyclic Pd nanostructure is formed by reassembling cubic Pd nanoparticles by controlling reduction speed by voltage and current. The size of the cyclic Pd nanostructure is 10-300 nm. The cyclic Pd nanostructure is used as a catalyst by reacting hydrogen and carbon dioxide generated in a facility for preventing air pollution.

Description

Ring type Palladium Nano Structure Body And The Palladium Nano Structure Catalyst For Synthesis Of Hydrocarbon}

The present invention provides a cyclic Pd nanostructure and a hydrocarbon thereof having a size of 10 to 300 nm by reassembling the cubic Pd nanoparticles by controlling the reduction rate at which palladium chloride (PdCl ₂ ) is reduced to cubic Pd nanoparticles with voltage and current. The present invention relates to a Pd nanostructure catalyst for compound synthesis.

Research into the application of shape-controlled nanoparticles as a catalyst is still in its infancy and proof of concept.

In addition, the technology to mass-produce high-purity shape-controlled nanoparticles is indispensable, but the synthesis is difficult and the reproducibility is lacking.

Accordingly, the present invention provides a hydrocarbon compound by reacting hydrogen and carbon dioxide generated in an air pollution emission suppression or prevention facility including a coal purification facility, a thermal power plant, or a cement processing plant by mass-producing a cyclic Pd nanostructure having a high purity shape. It can be used as a Pd nanostructure catalyst for synthesizing hydrocarbon compounds.

The present invention provides a cyclic Pd nanostructure having a size of 10 ~ 300nm by reassembling the cubic Pd nanoparticles by controlling the reduction rate at which palladium chloride (PdCl ₂ ) is reduced to cubic Pd nanoparticles with voltage and current. .

In addition, the present invention uses the cyclic Pd nanostructure as a cyclic Pd nanostructure catalyst for synthesizing a hydrocarbon compound by reacting hydrogen and carbon dioxide generated in the air pollution emission control or prevention facility to synthesize a hydrocarbon compound Provide Pd nanostructures.

The present invention also provides a Pd nanostructure catalyst for synthesizing a hydrocarbon compound comprising the cyclic Pd nanostructure.

As described above, the cyclic Pd nanostructure has a high energy and surface area of the structure itself, a chemically controllable physical property, and is a structurally very stable material. It shows excellent effects in various fields such as application of Pd nanostructure catalyst for hydrocarbon compound synthesis to synthesize hydrocarbon compound by reacting hydrogen and carbon dioxide generated in air pollution emission suppression or prevention facility including processing plant.

In addition, the nanostructures can be easily formed at room temperature and atmospheric pressure, which is low energy, so that high-purity ultra-precision Pd nanostructures can be produced.

According to the present invention, palladium chloride (PdCl ₂ ) is reduced to cubic Pd nanoparticles by reducing the voltage and current, thereby reassembling the cubic Pd nanoparticles. It is a structure in which shape-controlled nanoparticles are reassembled to ˜30 nm and a cyclic Pd nanostructure is formed by controlling a distance between unit particles.

That is, the present invention provides a cyclic Pd nanostructure in which palladium chloride (PdCl ₂ ) is reduced to cubic Pd nanoparticles by controlling the reduction rate with voltage and current to reassemble cubic Pd nanoparticles.

Here, the current is in the range of 0.01A ~ 10A, the voltage is 2V ~ 40V.

This method is to resynthesize the nanoparticles by controlling the reduction rate by adjusting the direction and rate of crystal growth of the nanometal to pH.

Here, the cyclic Pd nanostructure is formed by reassembling the cubic Pd nanoparticles by adjusting the pH in the range of 6 ~ 10.

At this time, the cubic Pd nanoparticles are those whose shape is controlled to a particle size of 1 ~ 30nm.

Here, the present invention is a technique for forming a cyclic Pd nanostructure through the shape control of the Pd nanoparticles during the molecular reassembly process while making the Pd metal nanoparticle sized Pd nanoparticles. In this method, the cyclic Pd nanostructure is prepared by controlling the rate of reduction by adjusting the direction and rate of crystal growth of Pd nanometal to pH. At this time, the reduction rate is adjusted by changing the voltage and current.

1 to 30nm cubic Pd nanoparticles and Pd nanostructure manufacturing method of the present invention by using the Pd rod electrolysis in the electrolyte to produce 100% pure Pd nanoparticles of 1 ~ 30nm cubic nanoparticles, Pd nanoparticles produced by adjusting the hydrogen ion concentration is to produce a cyclic Pd structure having a size of 10 ~ 300nm in which a certain shape that is self-assembled, that is, a ring shape is controlled.

Each Pd nanoparticle (1 ~ 30nm) synthesized in this way has a large specific surface area, and the formed nanostructures (10 ~ 300nm) have a higher photoactivity than conventional commercial photocatalyst with a special high energy.

In this case, nanomaterials exhibit different properties from the bulk state, and if the chemical properties such as the size, composition, and shape of the material are controlled at a size of 100 nm or less, the physical properties such as optical properties, electrical properties, and magnetic properties of the materials can be freely changed. You can. Nanostructures formed using these nanomaterials have various characteristics. First, they have a very large surface because of their small size. Second, they can control physical properties chemically. Third, they have excellent target binding properties. It is a very stable substance. The extraordinary high energy of these nanostructures themselves and the unique action of the nanostructures can cause a variety of functions in all of you.

The shape of the nanostructures is shown in FIG. 1. 1 is an analysis of the face centered cubic (FCC) of the Pd element.

In the case of FIG. 1, the Pd is a pure Pd metal, and a scanning transmission electron microscopy (STEM) photograph showing the state in which the crystal structure is almost perfectly arranged. These Pd nanoparticles are re-integrated, which may be said to be due to molecular self-assembly, and even after they are integrated, they have an annular hollow shape. Even if this integration continues, it continues to show a ring shape to some extent, and has a tendency like a fractal. In the end, this means that Pd has high crystallization at the atomic level, and it is assumed that it has high reactivity and selectivity.

It is also believed that the high reactivity and selectivity as the catalyst for artificial photosynthesis and the high crystals at the atomic level cause high reactivity and selectivity.

In the present invention, "artificial photosynthesis" refers to a process of generating a hydrocarbon compound by combining with carbon dioxide after decomposition of water in a situation in which light such as visible light or ultraviolet light is irradiated using a catalyst.

The Pd nanostructure has a very high hydrogen adsorption force. In particular, the hydrogen adsorption force is referred to as "normal temperature and pressure in the laboratory" (hereinafter, "normal temperature and pressure", where "normal temperature and pressure" means the temperature and 1 atmosphere of water to maintain a liquid state Of course, it also appears to be more than 100 times the volume. The reaction can be carried out even under 1 atm, and of course, even when the pressure exceeds this.

In addition, the Pd nanostructure acts as a catalyst having an excellent function in synthesizing hydrogen and carbon dioxide into a hydrocarbon compound. The most characteristic of these chemical reactions is that they are sufficient at "normal temperature and pressure." This reaction usually tends to be more accelerated in the presence of light. However, when synthesizing hydrogen and carbon dioxide, it is possible to react without light.

In addition, the Pd nanostructure acts as a catalyst showing a high efficiency in generating a hydrocarbon compound by combining carbon dioxide and hydrogen generated by decomposition of water in the light irradiation conditions. In this case, it is necessary to inject energy having the same wavelength as the light beam.

The Pd nanostructure is manufactured as follows.

In the nanostructure manufacturing method of the present invention, Pd nanoparticles are 100% pure Pd nanoparticles, which are 1-30 nm cubic nanoparticles by electrolysis in an electrolyte using Pd rods, and Pd nanoparticles are produced by controlling hydrogen ion concentration. It is to manufacture a large amount of cyclic Pd structure having a size of 10 ~ 300nm in which a self-assembled constant shape, that is, a ring shape controlled.

At this time, the electrode and water are electrolyzed in the electrolyte using a Pd rod as an electrode.

Here, the electrolyte may be used in various ways, but the concentration is 0.01% to 5% based on sodium chloride (NaCl), and the current and voltage are alternately controlled between 0.01A to 10A and 2V to 40V, so that the chloride ion Cl ⁻ ) combines with palladium (Pd) to form metal salts of Pd and Cl.

This process is performed in the process of evenly stirring the generated Pd nanoparticles and the electrolyte.

Pd and Cl metal salts of palladium chloride (PdCl ₂ ) are produced by palladium (Pd), which is a cubic Pd nanoparticle of 1 to 30 nm dropping by chloride ions (Cl ⁻ ) by hydrogen ions (H ⁺ ) generated around the cathode. An atom is produced. At this time, the rate of reduction of palladium chloride (PdCl ₂ ) to the cubic Pd nanoparticles is controlled by changing the voltage and current. The resulting palladium (Pd) atoms undergo molecular self-assembly (aggregation) to form Pd nanostructures and settle to the bottom of the production vessel. In the precipitated Pd, palladium chloride and Pd nanostructures are mixed. Here, the Pd nanostructure precipitated to the bottom or the Pd nanostructure gradually precipitated to the bottom is separated from the sodium chloride solution to obtain a pure Pd nanostructure. At this time, the chloride ion (Cl ⁻ ) is a chlorine gas (Cl ₂ ) to fly or re-enter the sodium chloride (NaCl) solution, the hydrogen ion (H ⁺ ) receives the electron becomes a hydrogen gas (H ₂ ). Here, the pH control of the solution is very important because the pH is related to the aggregation form of the Pd nanostructure. It can be seen that smooth aggregation usually occurs at pH 6-10. In this case, pH adjustment of the solution has a hydrogen ion (H ⁺⁾ and hydroxide ions (OH ^-) to adjust the voltage and current, the pH is adjusted as to control the amount of.

Another achievement of the present invention is that the method of obtaining the Pd nanostructures is again greatly improved.

When the Pd rod (pure Pd metal mass) used as an electrode in the process was occluded (absorbed and stored) before use as an electrode, the production efficiency of Pd nanostructures could be significantly increased. Here, occlusion refers to injecting hydrogen between Pd lattice.

The method of occluding hydrogen in Pd metal is widely known, and any method may be used. One of the hydrogen occlusion methods is that hydrogen is occluded in Pd when the Pd metal is raised in pressure and temperature in a hydrogen gas atmosphere. At this time, the hydrogen storage amount is proportional to the pressure, temperature and time.

In addition, since the storage amount of hydrogen is important to continuously discharge hydrogen in water, it is necessary to occlude as much hydrogen as possible.

The subsequent process is similar to using Pd without occluding hydrogen, as follows.

Electrodes and water are electrolyzed in electrolyte using Pd absorbed hydrogen.

In this case, various electrolytes may be used, but the concentration is 0.01% to 5% based on sodium chloride (NaCl), and the current and voltage are alternately controlled between 0.01A to 10A and 2V to 40V to allow chloride ion ( Cl ⁻ ) combines with palladium (Pd) to form metal salts of Pd and Cl.

This process is performed in the process of evenly stirring the resulting nanoparticles and the electrolyte.

Palladium metal chloride of the resulting Pd and Cl (PdCl ₂₎ is a chloride ion (Cl ^-) by the hydrogen ion (H ⁺⁾ generated by the surrounding anode one airway poor most of the ion air being emitted is occluded hydrogen chloride (Cl ^-) the separation and metal chloride of the resulting Pd and Cl palladium (PdCl ₂₎ is an ion chloride by the hydrogen ion (H ⁺⁾ generated by the surrounding anode (Cl ^-) falling cuboid of 1 ~ 30nm of Pd nanoparticles Palladium (Pd) atoms are produced. The resulting palladium (Pd) atoms undergo molecular self-assembly (aggregation) to form Pd nanostructures and settle to the bottom of the production vessel. In the precipitated Pd, palladium chloride and Pd nanostructures are mixed. Here, the Pd nanostructure precipitated to the bottom or the Pd nanostructure gradually precipitated to the bottom is separated from the sodium chloride solution to obtain a pure Pd nanostructure. At this time, the chloride ion (Cl ⁻ ) is a chlorine gas (Cl ₂ ) to fly or re-enter the sodium chloride (NaCl) solution, the hydrogen ion (H ⁺ ) receives the electron becomes a hydrogen gas (H ₂ ). Here, the pH control of the solution is very important because the pH is related to the aggregation form of the Pd nanostructure. It can be seen that smooth aggregation usually occurs at pH 6-10. In this case, pH adjustment of the solution has a hydrogen ion (H ⁺⁾ and hydroxide ions (OH ^-) to adjust the voltage and current, the pH is adjusted as to control the amount of.

Particularly, when Pd containing hydrogen is used, a large amount of Pd nanostructures can be produced over several hours. When Pd without hydrogen is used, production of Pd nanostructures can be inferior compared to stopping production within minutes. .

In addition, when using Pd rods that do not occlude hydrogen, palladium chloride and Pd nanostructures are mixed in the precipitated Pd. However, when Pd rods that occupy hydrogen are used, pure Pd nanostructures can be obtained. have.

Here, the hydrogen-containing Pd rod produces 100% purity Pd nanoparticles, which are 1-30 nm cubic nanoparticles in electrolysis, and the Pd nanoparticles produced are self-assembled by occluding hydrogen. It has a cyclic Pd structure having a size of 10 to 300 nm whose shape is cyclically controlled.

In addition, the process of fixing the Pd nanostructure to minimize the change in shape can be performed.

The cyclic Pd nanostructure is characterized in that the shape of the structure is fixed by treatment in an atmosphere from which oxygen is removed for 60 minutes to 120 minutes at a pressure of 10 to 100 atmospheres while maintaining the temperature 10 ℃ ~ 200 ℃.

At this time, after removing oxygen to prevent oxidation of Pd into PdO, argon and nitrogen, which are inert gases, are added, and the pressure is applied to fix the shape of the cyclic Pd nanostructure.

That is, in order to fix the generated nanostructures, the temperature is maintained at 10 ° C. to 200 ° C., and then treated in an atmosphere from which oxygen is removed for 60 to 120 minutes at a pressure of 10 to 100 atm.

The treated Pd is mainly formed of a cyclic Pd nanostructure.

The cyclic Pd nanostructure was found to have an excellent effect as a photosensitivity catalyst.

The structure of this catalyst generally has a structure capable of amplifying more than about 1.23 eV of energy, which is the principle energy required to oxidize or reduce water, to sunlight in the visible range, and is actually higher than many studies obtained on single crystal surfaces. It can be seen that it is a catalyst having reactivity and selectivity.

The unique catalytic properties of the shape-controlled nanoparticles can control the optical properties by varying the distance between the nanoparticles, and show not only the large surface response of the nanoparticles, but also the quantum dot energy of the nanostructures. .

In other words, the development of this technology means the invention of the core technology of the artifical photosystem that the world intends to do.

According to the present invention, it is possible to produce a Pd nanostructure that can amplify a large energy by a simple method and to produce a hydrocarbon compound by synthesizing hydrogen and carbon dioxide with the nanostructures thus produced demonstrated excellent performance.

The present invention also provides a Pd nanostructure catalyst for synthesizing a hydrocarbon compound comprising the cyclic Pd nanostructure.

In addition, the present invention uses the cyclic Pd nanostructure as a cyclic Pd nanostructure catalyst for synthesizing a hydrocarbon compound by reacting hydrogen and carbon dioxide generated in the air pollution emission control or prevention facility to synthesize a hydrocarbon compound Provide Pd nanostructures.

Here, the air pollution emission suppression or prevention facility includes a coal purification facility, a thermal power plant or a cement processing plant.

Here, the technology of synthesizing a hydrocarbon compound as hydrogen and carbon dioxide is a technique for making various useful hydrocarbons by contacting carbon dioxide with hydrogen, and remains in an academic search stage in which researches on catalyst development are actively conducted worldwide. Although concentrated on TiO ₂ , the present invention was able to solve the problem of carbon dioxide (CO ₂ ) emission by developing a new concept pd nanostructure catalyst, and at the same time was recognized as a technology for the process of carbon dioxide (CO ₂ ).

This technique steelmaking process thermal power cement processing BFG (Blast Furnace Gas) generated in the process, (Coke oven Gas) COG has a large amount of hydrogen (H ₂₎ and carbon dioxide gas generated in the coke production process of the coal as a fuel It contains (CO ₂ ). However, the technology of separating hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) is not easy, so some of them are used to re-fuel and the other carbon dioxide (CO ₂ ) and hydrogen (H ₂ ) are discharged.

On the other hand, the present invention is a breakthrough technology that can achieve a carbon dioxide (CO ₂ ) resource while synthesizing a useful hydrocarbon compound using a Pd nano structure catalyst without a separate separation process.

Here, the cyclic Pd nanostructure catalyst of the present invention has an excellent ability to occlude hydrogen (H ₂ ) in H state and separate it into H ⁺ and e ⁻ , wherein dissociated electrons, carbon dioxide (CO ₂ ) and hydrogen ( H ₂ ) combines to produce hydrocarbon compounds, so it is a breakthrough catalyst that enables the complete treatment of carbon dioxide (CO ₂ ), which is the main culprit of global warming, and furthermore, the technology of carbon dioxide (CO ₂ ) recycling.

In addition, cyclic Pd nanostructures containing hydrogen (H ₂ ) generated by the application of water photolysis catalysts can be used to separate hydrogen at a constant temperature or pressure, and hydrocarbon compounds can be combined with continuous hydrogen separation and carbon dioxide (CO ₂ ). Can produce 50cc of distilled water was added to 200cc quartz (Quartz) Erlenmeyer flask at 80,000 lux of general sunlight, and 1g of cyclic Pd nanostructure was irradiated for 1 hour to produce 50 ~ 60cc of hydrogen. This result is far superior to other existing hydrogen storage experiments.

Hydrocarbon compound production experiments are specifically as follows.

Connect the tube-operated metering pump to a vacuum chamber with a volume of 1460 cc with a leak of hydrogen or carbon dioxide or a Marprene tube that is not chemically reactive, add 500 cc of distilled water and 1 g of a catalyst, and replace it with argon (Ar) to replace oxygen ₂ ), nitrogen (N ₂ ) Remove the back air. After removal, about 10% of hydrogen (H ₂ ) and about 30% of carbon dioxide (CO ₂ ) are injected to equilibrate the air pressure, and the amount of hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) is measured. do. After circulating the gas in the vacuum chamber with a tube-type metering pump, the change in the amount of hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) is measured over time. This experiment is carried out at room temperature and pressure, and the artificial external energy is completely excluded.

The scheme is as follows.

_{^{CO 2 + 2H + + 2e -}} → HCOOH - 0.61V

CO ₂ + 4H ⁺ + _{^{4e - → HCHO + H 2 O}} - 0.48V

CO ₂ + 6H ⁺ + _{^{6e - → CH 3 OH + H}} 2 O - 0.38V

CO ₂ + 8H ⁺ + ^{_{4e - → CH 4 + H 2}} O - 0.48V

And variously.

The experimental results are as follows.

The change in the amount of hydrogen (H ₂ ): carbon dioxide (CO ₂ ) was 2.5: 1 and 3.5: 1, but it was consumed at an average ratio of 3: 1. As a result, the consumption rate of hydrogen and carbon dioxide was 45 ~ 60cc / hg of hydrogen (1 hour with 1g of catalyst) and 10 ~ 20cc / hg of carbon dioxide (1 hour of 1g of catalyst). In addition, the change in the rate of synthesis of hydrocarbon compounds appears faster as the concentration of hydrogen (H ₂ ) increases. As a result of the experiment, the product appeared in various ways such as methanol, ethanol, acetaldehyde, formaldehyde.

The analysis equipment was analyzed by hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) by GC-TCD Agilent 6890. The column was C-26438-04, and the generated hydrocarbon compounds were analyzed by GC-MS Shimadg and GC-. MS-QP5010 used SE-30 as a column.

In addition, the cyclic Pd nanostructure analysis may be performed using a transmission electron microscope (TEM), a high-resolution transmission electron microscopy (HREM), and a scanning transmission electron microscope (STEM). Analyzed.

Figure 2 shows the results of TEM analysis of the metal powder specimen of the cyclic Pd nanostructures.

As shown in FIG. 2, the size of the cyclic Pd nanostructure to which the Pd nanoparticles are attached to form a ring is about 10 nm, and the A region (most regions) is almost composed of Pd elements.

3 shows the results of STEM analysis of the metal powder specimen of the cyclic Pd nanostructure.

3 shows that the Pd nanoparticles form a complete structure with a cyclic Pd nanostructure. That is, Figure 3 is a face centered cubic (FCC) analysis of the Pd nanoparticles, the Pd nanoparticles are pure Pd metal scanning electron microscope showing the state that the crystal structure is almost perfectly arranged (scanning transmission electron microscopy; STEM). Here, the ringing of the light shows that every single nanoparticle is exactly a crystal.

FIG. 4 is a high-resolution transmission electron microscopy (HREM) photograph of a metal powder specimen of a cyclic Pd nanostructure, showing analysis of a contrast image by a transmitted electron beam.

As shown in FIG. 4, the Pd nanostructure of the present invention is cyclic.

FIG. 5 is a Scanning Transmission Electron Microscopy (STEM) picture of the metal powder specimen of the cyclic Pd nanostructure, the left picture is BF, that is, the Z-contrast of STEM, and the right picture is HAADF, The picture shows the z-contrast of STEM.

As shown in FIG. 5, the Pd nanostructure of the present invention is cyclic.

Hereinafter, the present invention will be described in detail by way of examples.

However, the following examples are illustrative of the present invention, and the contents of the present invention are not limited by the following examples.

Example 1

The electrode and water were electrolyzed in 500 g of 3% sodium chloride electrolyte using 300 g of Pd rod as an electrode, thereby producing 100 g of 100% pure Pd nanoparticles, which are 1-30 nm cubic nanoparticles. At this time, the current and voltage is 0.01A ~ 10A, 2V ~ In adjusted to pH 8 by controlling alternately between 40V anode chloride ions (Cl ^-) palladium chloride and palladium Pd metal salts in combination with Cl (Pd) ( 280 g of PdCl ₂ ) were produced. The palladium chloride (PdCl ₂ ) is ions (Cl ⁻ ) drop by the hydrogen ions (H ⁺ ) generated around the cathode and a palladium (Pd) atom, a cubic Pd nanoparticle of 1 to 30nm was produced. The resulting palladium (Pd) atoms were molecularly assembled (aggregated) to form Pd nanostructures and settled to the bottom of the production vessel. The Pd nanostructures precipitated to the bottom or Pd nanostructures gradually settled to the bottom are separated from the sodium chloride solution to control the hydrogen ion concentration, and the Pd nanoparticles produced by self-assembly are uniformly shaped, that is, the shape is controlled. 50 g of a cyclic Pd structure having a size of 10 to 300 nm was produced.

Example 2

Hydrocarbon compounds were produced using the cyclic Pd nanostructures produced in Example 1. First, as shown in FIG. 6, a tube-linked metering pump was connected to a vacuum chamber having a volume of 1460 cc with a leak of hydrogen or carbon dioxide or a Marprene tube without chemical reactivity. Substituted with argon (Ar) to oxygen (O ₂ ), nitrogen (N ₂ ) Back air was removed. After removing the air, 10% of hydrogen (H ₂ ) and 30% of carbon dioxide (CO ₂ ) are injected to equilibrate the air pressure, and the amount of hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) is measured. Was carried out. After circulating the gas in the vacuum chamber with a tube-linked metering pump, the change in the amount of hydrogen (H ₂ ) and carbon dioxide (CO ₂ ) was measured with time. This experiment was carried out at room temperature and pressure, and completely excluded from artificial external energy.

The hydrogen analysis, carbon dioxide analysis was analyzed by GC-TCD Agilent 6890, the column was C-26438-04. In addition, the analysis of the hydrocarbon compound was analyzed by GC-MS Shimadg and GC-MS-QP5010 and the column used SE-30.

Hydrogen (H ₂ ): carbon dioxide (CO ₂ ) = 2.5: 1 was consumed, the synthesis rate was 45cc / hg hydrogen, 10cc / hg carbon dioxide, the product is produced in a variety of methanol, ethanol, acetaldehyde, formaldehyde, etc. It became.

Hydrocarbon compound production experiments showed that the cyclic Pd nanostructure can synthesize various hydrocarbon compounds such as methanol, ethanol, acetaldehyde and formaldehyde as electrons, hydrogen and carbon dioxide.

In addition, the Pennsylvania State University's experimental results, which are the best among the experimental results until 2009, used Cu / TiO ₂ as a catalyst and a hydrocarbon compound as carbon dioxide (CO ₂ ). Synthetic test results showed that the carbon dioxide consumption rate was 0.16cc / gh, which is 20 times better than the existing results. However, the result of using the pd structure catalyst of the present invention is that the carbon dioxide (CO ₂ ) consumption efficiency of about 60 times more than this. The hydrocarbon compound as a product of the present invention is similar to the experimental results using other catalysts in other countries.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a photograph of a cyclic Pd nanoparticle structure prepared by the present invention.

Figure 2 is a photograph showing the results of TEM analysis of the metal powder specimen of the cyclic Pd nanostructures.

3 is a photograph showing the results of STEM analysis showing a state in which the crystal structures of the metal powder specimens of the cyclic Pd nanostructure are almost perfectly arranged.

FIG. 4 is a high-resolution transmission electron microscopy (HREM) photograph of a metal powder specimen of a cyclic Pd nanostructure, showing analysis of a contrast image by a transmitted electron beam.

FIG. 5 is a Scanning Transmission Electron Microscopy (STEM) picture of the metal powder specimen of the cyclic Pd nanostructure, the left picture is BF, that is, the Z-contrast of STEM, and the right picture is HAADF, The picture shows the z-contrast of STEM.

6 is a view showing an experimental apparatus for a hydrocarbon compound synthesis experiment according to an embodiment of the present invention.

Claims (6)

A cyclic Pd nanostructure having a size of 10 to 300 nm in which palladium chloride (PdCl ₂ ) is reassembled to cubic Pd nanoparticles by controlling a reduction rate at which a cubic Pd nanoparticle is reduced into voltage and current. The cyclic Pd nanostructure of claim 1, wherein the current is 0.01A to 10A and the voltage is 2V to 40V. The cyclic Pd nanostructure of claim 1, wherein the cubic Pd nanoparticles are shape-controlled to have a particle diameter of 1 to 30 nm. The method of claim 1, wherein the cyclic Pd nano structure is characterized in that the shape of the structure is fixed by treating in an atmosphere from which oxygen is removed for 60 minutes to 120 minutes at a pressure of 10 to 100 atm while maintaining the temperature 10 ℃ ~ 200 ℃ Cyclic Pd nanostructures. A cyclic Pd nanostructure catalyst for synthesizing a hydrocarbon compound by reacting the cyclic Pd nanostructures according to any one of claims 1 to 4 with hydrogen generated from an air pollution emission suppression or prevention facility and carbon dioxide. Cyclic Pd nano structure, characterized in that used. A Pd nanostructure catalyst for synthesizing a hydrocarbon compound, comprising the cyclic Pd nanostructure according to any one of claims 1 to 4.

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