KR101091705B1 - Preparation method of zeolite catalyst having iron ions for single reduction of nitrous oxide or simultaneous reduction of nitrous oxide and nitrogen monoxide by ammonia reductant and single reduction of nitrous oxide or simultaneous reduction of nitrous oxide, zeolite catalyst by using the method and nitrogen monoxide by using the method - Google Patents

Abstract

The present invention provides a method for preparing a zeolite catalyst loaded with iron ions for the sole reduction of nitrous oxide, which is a greenhouse gas, or simultaneous reduction of nitrous oxide and nitrogen monoxide, which is an air pollutant gas, and a catalyst and an ammonia reducing agent using the ammonia reducing agent. The present invention relates to a method for reducing nitrous oxide alone or simultaneously with nitrous oxide and nitrogen monoxide. The purpose of the present invention is to provide iron ions supported as a high-efficiency catalyst for the sole reduction of nitrous oxide or simultaneous reduction of nitrous oxide and nitrogen monoxide by ammonia reducing agent. The present invention provides a method for preparing a zeolite catalyst and a method for reducing nitrous oxide alone or reducing the temperature of nitrous oxide and nitrogen monoxide simultaneously by using the catalyst and the ammonia reducing agent using the same.

The composition of the present invention comprises the steps of (A) pre-treating the zeolite with moisture at high temperature, (B) supporting the iron ion with a precursor material solution of iron ions in the zeolite pretreated in the step (A), and (C ) (B) filtering and drying the zeolite particles containing iron ions in step (B), (D) step (B) and (C) to increase the iron content of the powder dried in step (C) Iterative process step, and (E) for the reduction of nitrous oxide alone or simultaneous reduction of nitrous oxide and nitrogen monoxide by ammonia reducing agent, characterized in that it comprises the step of firing the catalyst prepared in step (D) in the air Method for preparing a zeolite catalyst bearing iron ions and a catalyst prepared therefrom and the reduction of nitrous oxide alone by the ammonia reducing agent using the same or simultaneous nitrous oxide and nitrogen monoxide It characterized by a low-temperature-up methods of sense temperature.

Nitrogen dioxide, nitrogen monoxide, ammonia reducing agent, zeolite catalyst, single reduction, simultaneous reduction

Description

Method for preparing a zeolite catalyst loaded with iron ions for simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide by ammonia reducing agent and its catalyst and simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide by ammonia reducing agent {Preparation method of zeolite catalyst having iron ions for single reduction of nitrous oxide or simultaneous reduction of nitrous oxide and nitrogen monoxide by ammonia reductant and single reduction of nitrous oxide or simultaneous reduction of nitrous oxide, zeolite catalyst by using the method and nitrogen monoxide by using the method}

The present invention relates to a method for preparing an iron ion-supported zeolite catalyst for simultaneously reducing nitrous oxide and nitrogen monoxide by an ammonia reducing agent, and to a method for simultaneously reducing the nitrous oxide and nitrogen monoxide using the catalyst. The present invention relates to a technique for water treatment of the supported zeolite catalyst or for supporting iron ions in the water-treated zeolite, and then simultaneously reducing nitrous oxide or simultaneously reducing nitrous oxide and nitrogen monoxide using ammonia reducing agent.

Nitrous oxide emissions account for about 25% of the sources in industry. Nitrous oxide released is usually present with nitrogen monoxide in an oxygen-rich atmosphere. Nitrogen monoxide emitted from the fixed source is removed by selective catalytic reduction (SCR) technology using reducing agents such as ammonia, hydrogen and carbon monoxide.

Numerous types of catalysts have been developed to apply the technology at low and high temperatures, of which the V ₂ O ₅ -TiO ₂ -based catalyst system has been commercialized and used mainly with ammonia reducing agents.

In order to reduce nitrous oxide, iron-supported zeolite catalysts are mainly used, and hydrocarbon or ammonia such as methane and propane are used as reducing agents.

Reduction of nitrous oxide can be achieved at temperatures below 400 ° C. when hydrocarbons are used as reducing agents, whereas temperatures of 400 ° C. or higher are required to achieve the same reduction of nitrous oxide when ammonia is used as reducing agents.

Therefore, there is a difficulty in the simultaneous reduction technology of nitrous oxide and nitrogen monoxide using a single reducing agent.

Look for a specific prior art below.

U.S. Patent Nos. 5,198,403 and 5,300,472 disclose a catalyst by mixing titanium oxides with oxides in W, Si, B, Al, P, Zr, Ba, Y, La, Ce and oxides in Y, Nb, Mo, Fe, Cu. Was prepared, and ammonia was used as a reducing agent to selectively reduce nitrogen monoxide. 50% to 99% or more of the prepared catalysts consisted of titanium oxide. In the temperature range of 360 ° C.-500 ° C., 81.1% -94.3% of nitrogen monoxide was reduced.

US 2002/0127163 A1, PCT Patent WO 02/072245 A2, and Domestic Patent No. 10-2004-0010608 disclose zeolites such as BETA, ZSM, MORD, and Y for the selective reduction of nitrogen monoxide using ammonia. Fe, Cu, Co, Ce, Pt, Rh, Pd, Ir, Mg, etc. were ion-exchanged to prepare a catalyst. In addition, a catalyst having an activity for selective reduction of nitrous oxide was selected from these prepared catalysts to selectively reduce nitrogen monoxide and nitrous oxide. The conversion of nitrous oxide was found to be 80% and 99% at temperatures of 450 and 500 ° C, respectively.

US Pat. Nos. 6,682,710 B1, US 2004/0192538 A1, and US 7,238,641 B2 provide a method for removing nitrous oxide and nitrogen monoxide using a catalyst obtained by ion exchange of iron ions to FER zeolite.

US Pat. No. 6,872,372 B1 suggests that when palladium, rhodium, gold and the like are added to a zeolite catalyst containing iron ions, nitrous oxide can be selectively reduced at a temperature of 350 ° C. or lower. As the reducing agent, saturated hydrocarbons of methane or propane were used.

Japanese Patent No. 2006281026 discloses titanium oxide and Cr, Mg, Fe, Co, Ni, Cu, Mo, Ru, Rh, Pd, Ag, In, Sn, W, Pt, Au, Pb to catalytically reduce nitrogen oxides. It was mixed with one of these oxides and used as a catalyst.

In the above patents, the use of hydrocarbons as reducing agents indicates that nitrous oxide can be reduced at temperatures below 350 ° C.

However, when ammonia is used as the reducing agent, the catalysts used in the above patents require temperatures of 360 ° C. or higher to reduce nitrous oxide alone.

In addition, when ammonia is used as the reducing agent, the techniques used in the above patents suggest temperatures of 400 ° C. or higher as effective temperatures for simultaneous reduction of nitrogen monoxide and nitrous oxide.

Therefore, while using ammonia as a reducing agent, it is necessary to develop a catalyst production and a simultaneous reduction technology that lower the temperature for reducing nitrous oxide alone and the temperature for simultaneously reducing nitrogen monoxide and nitrous oxide to the level of using hydrocarbon as the reducing agent. Do.

An object of the present invention for solving the above problems is a method for preparing an iron ion-supported zeolite catalyst capable of simultaneously reducing nitrous oxide and nitrogen monoxide at a reaction temperature of 300 ~ 400 ℃ using ammonia as a reducing agent and the catalyst To provide.

Another object of the present invention is to provide a method for reducing nitrous oxide by reducing the reaction temperature at a low temperature using a zeolite catalyst containing iron ions having ammonia as a reducing agent.

Another object of the present invention is to provide a method for reducing nitrous oxide and nitrogen monoxide simultaneously by reducing the reaction temperature at a low temperature using a zeolite catalyst containing iron ions having ammonia as a reducing agent.

The present invention, which achieves the object as described above and performs the task for eliminating the conventional defects, (A) heating the zeolite to 400 ~ 600 ℃, and then the water of 0.1 to 5 times the weight of the zeolite in a nitrogen atmosphere A pretreatment step of supplying water for 0.1 to 2 hours to treat the moisture; (B) supporting iron ions with a precursor material solution of iron ions in the zeolite pretreated in step (A), and (C) filtering and drying the zeolite particles containing iron ions in step (B) (D) repeating the steps of (B) and (C) for increasing the iron content of the powder dried in step (C), and (E) the catalyst prepared in step (D) in air It is achieved by providing a method for preparing a zeolite catalyst loaded with iron ions for the sole reduction of nitrous oxide by the ammonia reducing agent, or the simultaneous reduction of nitrous oxide and nitrogen monoxide.

The zeolite of step (A) comprises one of BEA, MFI, MOR, FER, the Al ₂ O ₃ / SiO ₂ mole ratio of the zeolite is 5 to 100, the cation form in the zeolite is sodium, ammonium, hydrogen It is characterized by using one selected from the.

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Iron nitrate hydrate (Fe (NO ₃ ) ₃ · 9H ₂ O) is used as the precursor material of the iron ion of step (B) and the concentration is characterized in that it is adjusted to 0.001 ~ 1.0 molarity.

To the solution of the iron ion precursor material, the zeolite treated in the step (A) is added at a weight ratio of 0.1 to 3.0, and stirred at a temperature of 10 to 35 ° C. for 5 to 30 hours.

In the step (C), the zeolite slurry of step (B) is filtered and the cake obtained is washed with 500 to 2000 ml of deionized distilled water, and the zeolite containing iron ions obtained after washing is 100 to 120 ° C. in air. It is characterized by a method of drying for 5 to 24 hours.
In the step (D), the step (C) is repeated 2 to 5 times in the step (B).
The step (E) is characterized in that the zeolite which has undergone the step (D) is calcined at a temperature of 400 ~ 600 ℃ in air for 1 to 5 hours.

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In addition, according to another embodiment of the present invention, the zeolite loaded with iron ions is activated according to the method for preparing the catalyst. 100% of nitrous oxide is reduced, and when nitrous oxide and nitrogen monoxide are simultaneously supplied, 70 to 100% of nitrous oxide and nitrogen monoxide are simultaneously reduced. It is achieved by providing a zeolite catalyst loaded with iron ions for simultaneous reduction of nitrous oxide and nitrogen monoxide.
In another embodiment of the present invention, after supplying nitrous oxide alone or simultaneously supplying nitrous oxide and nitrogen monoxide, the catalyst is reacted with a zeolite catalyst loaded with iron ions activated according to the catalyst production method and ammonia is used as a reducing agent. Reduction of ammonia as a reducing agent, characterized by reducing 70 to 100% of nitrous oxide supplied alone at a catalytic reaction temperature of 300 to 400 ° C or reducing 70 to 100% of nitrous oxide and nitrogen monoxide simultaneously supplied at the same time. By providing nitrous oxide alone or a method for simultaneously reducing nitrous oxide and nitrogen monoxide.

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The present invention can reduce the nitrous oxide alone or nitrous oxide and nitrogen monoxide at a temperature of 300 ~ 400 ℃ at the same time by using ammonia reducing agent by using a zeolite catalyst loaded with iron ion after water treatment of zeolite It is a useful invention that has the advantage of using a single reducing agent for improving and simultaneously reducing the industrial use is expected to be greatly expected.

Hereinafter, the configuration and the operation of the embodiments of the present invention will be described in detail 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.

In the present invention, when ammonia is used as a reducing agent, a method for preparing a zeolite catalyst containing iron ions to reduce nitrous oxide and nitrogen monoxide simultaneously, a catalyst prepared therefrom, and nitrous oxide alone or nitrous oxide and nitrous oxide using the same Simultaneous reduction of nitrogen is a feature of the technical idea.

Specifically, the method for preparing the iron-containing catalyst is as follows.

(A) pretreatment of the zeolite with moisture at high temperature,

(B) supporting iron ions with a precursor material solution of iron ions in the zeolite pretreated in step (A);

(C) filtering and drying the zeolite particles containing iron ions in the step (B),

(D) repeating the steps of (B) and (C) to increase the iron content of the powder dried in step (C),

(E) calcining the catalyst prepared in step (D) in air.

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More specifically, each step will be described as follows.

Step (A) is a step of preparing a zeolite for supporting iron ions by water treatment.

Zeolites include one of Beta (BEA), ZSM-5 (MFI), Mordenite (MOR), and Ferrierite (FER), and have a Al ₂ O ₃ / SiO ₂ mole ratio of 5 to 100 in the zeolite. One of the cation forms is sodium, ammonium or hydrogen. Al ₂ O ₃ / SiO ₂ mole ratio of zeolite Outside of the range indicated, the amount of iron ions supported is extremely small, and thus it is difficult to exert its efficacy as a catalyst. In addition, since the cation form in the zeolite is supported by the ion exchange method in the zeolite, other than the suggested cation form, the ion exchange performance with the iron ion is lowered.

The prepared zeolite is heated to 400 to 600 ° C., and then 0.1 to 5 times the water content of the zeolite is supplied in a nitrogen atmosphere for 0.1 to 2 hours. In order to obtain the water treatment effect of the zeolite, it is preferable to perform the water treatment in the range of such numerical limitation conditions.

Step (B) is a step of preparing the iron ion solution and supporting the iron ion in the zeolite.

Iron nitrate hydrate (Fe (NO ₃ ) ₃ · 9H ₂ O) is used as a precursor material of iron ions, and the concentration is adjusted to 0.001 to 1.0 molar concentration. This range of concentrations is intended to suppress excess iron ion loading while providing a driving force for the ion exchange of iron ions into the zeolite.

The zeolite treated in step (A) is added to a solution of the iron ion precursor material at a weight ratio of 0.1 to 3.0, and stirred at a temperature of 10 to 35 ° C. for 5 to 30 hours. The range of these conditions is to maximize the ion exchange amount of iron ions.

Step (C) is a step of filtering the zeolite slurry of step (B) and washing the obtained cake with 500 to 2000 ml of deionized distilled water. In this step, iron ions in the solution that are not ion-exchanged in the zeolite are removed by filtration, and excess iron ions buried around the zeolite particles are removed by washing. Limiting the amount of distilled water for washing is to minimize the loss of iron ions supported in the zeolite while increasing the effect of removing excess iron ions.

Zeolites containing iron ions obtained after washing are dried for 5 to 24 hours at a temperature of 100 ~ 120 ℃ in air. The limit of drying temperature and time is to remove the moisture contained in the zeolite, to enhance the effect of further ion exchange and firing in the next step.

In the step (D), the step (C) is repeated 2 to 5 times in the step (B). The limit of the number of repetitions is to prevent the formation of excess iron oxide around the zeolite particles while maximizing the amount of iron ions supported.

In the step (E), the zeolite which has undergone the step (D) is calcined for 1 to 5 hours at a temperature of 400 to 600 ° C. in air. This range of temperature and time is to remove impurities contained in the catalyst.

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The present invention also reduces nitrous oxide and nitrogen monoxide by reducing nitrous oxide alone or nitrous oxide and nitrogen monoxide simultaneously with ammonia at a temperature of 300 to 400 ° C. by supporting iron ions in zeolite according to the catalyst production method.

Examples are provided below to clarify the understanding of the construction of the present invention.

≪ Example 1 >

8 g of BEA zeolite with an Al ₂ O ₃ / SiO ₂ mole ratio of 25 was heated to 500 ° C. while supplying 1 liter / min of nitrogen, and then deionized distilled water was flowed through a syringe pump at a flow rate of 0.5 ml / min. Was fed for 1 hour. After the supply of distilled water, cooled to room temperature at the same nitrogen flow rate to prepare a water-treated BEA zeolite (A).

The iron ion solution (B) was prepared by dissolving 1.6 g of iron nitrate hydrate (Fe (NO ₃ ) ₃ .9H ₂ O) in 1 liter of deionized distilled water. 8 g of water-treated BEA zeolite (A) was dispersed in 1 liter of the prepared iron ion solution (B) and stirred at a temperature of 21 ° C. for 24 hours. The stirred zeolite slurry was filtered to obtain a zeolite cake loaded with iron ions, and the cake was washed with 1 liter of deionized distilled water. The washed cake was dried for 12 hours at a temperature of 105 ° C in air. The dried zeolite was added to the iron ion solution again, and the iron ion was ion exchanged and dried twice. The zeolite carrying the final dried iron ions was calcined for 4 hours at a temperature of 500 ℃ in air.

<Example 2>

The iron ion solution (B) was prepared by dissolving 1.6 g of iron nitrate hydrate (Fe (NO ₃ ) ₃ .9H ₂ O) in 1 liter of deionized distilled water. 8 g of BEA zeolite having an Al ₂ O ₃ / SiO ₂ mole ratio of 25 was dispersed in 1 liter of the prepared iron ion solution (B) and stirred at a temperature of 21 ° C. for 24 hours. The stirred zeolite slurry was filtered to obtain a zeolite cake loaded with iron ions, and the cake was washed with 1 liter of deionized distilled water. The washed cake was dried for 12 hours at a temperature of 105 ° C in air. The dried zeolite was added to the iron ion solution again, and the iron ion was ion exchanged and dried twice. The zeolite carrying the final dried iron ions was calcined for 4 hours at a temperature of 500 ℃ in air.

In order to water-treat the Fe ion-supported BEA zeolite catalyst, it was heated to 500 DEG C while supplying 1 liter / min of nitrogen to 0.4 g of the calcined catalyst, and then deionized distilled water was fed at 0.017 ml / min through a syringe pump. The flow was supplied for 1 hour. After the supply of distilled water, the temperature was cooled to room temperature at the same nitrogen flow rate.

&Lt; Example 3 >

For comparison with the catalysts of <Example 1> and <Example 2> was prepared BEA zeolite loaded with iron ions not included in the water treatment process.

The iron ion solution (B) was prepared by dissolving 1.6 g of iron nitrate hydrate (Fe (NO ₃ ) ₃ .9H ₂ O) in 1 liter of deionized distilled water. 8 g of BEA zeolite having an Al ₂ O ₃ / SiO ₂ mole ratio of 25 was dispersed in 1 liter of the prepared iron ion solution (B) and stirred at a temperature of 21 ° C. for 24 hours. The stirred zeolite slurry was filtered to obtain a zeolite cake loaded with iron ions, and the cake was washed with 1 liter of deionized distilled water. The washed cake was dried for 12 hours at a temperature of 105 ° C in air. The dried zeolite was added to the iron ion solution again, and the iron ion was ion exchanged and dried twice. The zeolite carrying the final dried iron ions was calcined for 4 hours at a temperature of 500 ℃ in air.

<Example 4>

To test the reactivity of the catalysts prepared in <Example 1>, <Example 2> and <Example 3> for the reduction reaction of nitrous oxide alone using ammonia, 0.4 g of catalyst was placed in the center of a 1/2 "stainless steel tube reactor. The temperature of the reactor was raised from room temperature to 500 ° C. at an rate of 4 ° C./min using an electric furnace.

Nitrous oxide was supplied at a concentration of 400 ppm and 400 ppm ammonia reducing agent was used. The oxygen concentration in the reaction gas was adjusted to 3,000 ppm. The total flow rate of the reaction gas was fixed at 0.4 l / min using nitrogen, and the space velocity (GHSV) was maintained at 20,000 hr ⁻¹ . After the reaction, the concentration of nitrous oxide was analyzed by on-line gas analyzer (SIEMENS) to analyze the composition of the gas.

Figure 2 is a graph showing the reduction rate of nitrous oxide alone using the ammonia reducing agent of the iron ion-supported BEA zeolite catalysts prepared in <Example 1> and <Example 2> and <Example 3, according to the temperature, space velocity : 20,000 hr ⁻¹ , total flow rate: 0.4 l / min, [N ₂ O] 400 ppm, [O ₂ ] 3,000 ppm, [NH ₃ ] 400 ppm.

The nitrous oxide conversion of the catalysts prepared in <Example 1>, <Example 2> and <Example 3> was 89%, 69%, and 27%, respectively, at a reaction temperature of 350 ° C. It was confirmed that the conversion of nitrous oxide was significantly improved compared to the BEA zeolite loaded with iron ions, which was not treated at all, in the catalyst loaded with iron ions.

Example 4

In order to test the reactivity of the catalysts prepared in Example 1 for the simultaneous reduction reaction of nitrous oxide and nitrogen monoxide using ammonia, 0.4 g of the catalyst was placed in the center of the 1/2 "stainless steel tube reactor. Using an electric furnace, the temperature was raised from room temperature to 500 ° C. at a rate of 4 ° C./min.

Nitrous oxide and nitrogen monoxide were supplied at a concentration of 400 ppm each, and 800 ppm of ammonia reducing agent was used. The oxygen concentration in the reaction gas was adjusted to 3,000 ppm. The total flow rate of the reaction gas was fixed at 0.4 l / min using nitrogen, and the space velocity (GHSV) was maintained at 20,000 hr ⁻¹ . After the reaction, the concentration of nitrous oxide was analyzed by on-line gas analyzer (SIEMENS) to analyze the composition of the gas.

3 is a graph showing the simultaneous reduction rate of nitrous oxide and nitrogen monoxide using the ammonia reducing agent of the iron ion-supported BEA zeolite catalyst prepared in <Example 1> according to the temperature; space velocity: 20,000 hr ⁻¹ , total flow rate: 0.4 l / min, [NO] 400 ppm, [N ₂ O] 400 ppm, [O ₂ ] 3,000 ppm, [NH ₃ ] 800 ppm.

The conversion rate of nitrous oxide and nitrogen monoxide of the catalyst prepared in Example 1 was 75% and 100%, respectively, at a reaction temperature of 350 ° C., thereby simultaneously reducing nitrous oxide and nitrogen monoxide using ammonia single reducing agent. It was confirmed that it was lost.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is a flowchart illustrating a process for preparing a zeolite catalyst carrying iron ions for reducing nitrous oxide alone or nitrous oxide and nitrogen monoxide simultaneously using ammonia as a reducing agent,

2 is a graph showing the reduction rate of nitrous oxide alone using the ammonia reducing agent of the iron ion-supported BEA zeolite catalysts prepared in <Example 1>, <Example 2> and <Example 3> with temperature,

3 is a graph showing the simultaneous reduction rate of nitrous oxide and nitrogen monoxide using the ammonia reducing agent of the iron ion-supported BEA zeolite catalyst prepared in <Example 1> according to the temperature.

Claims (12)

(A) a pretreatment step of heating the zeolite to 400-600 ° C., followed by supplying 0.1-5 times the moisture for 0.1-2 hours with respect to the zeolite weight in a nitrogen atmosphere for water treatment; (B) supporting iron ions with a precursor material solution of iron ions in the zeolite pretreated in step (A); (C) filtering and drying the zeolite particles containing iron ions in the step (B); (D) repeating the steps of (B) and (C) to increase the iron content of the powder dried in step (C); And (E) calcining the catalyst prepared in step (D) in the air; using ammonia as a reducing agent, characterized in that it comprises nitrous oxide alone or iron ions for simultaneous reduction of nitrous oxide and nitrogen monoxide Method of preparing a zeolite catalyst. The method according to claim 1, In the step (A) zeolite includes one of BEA, MFI, MOR, FER, Zeolite Al ₂ O ₃ / SiO ₂ mole ratio is 5 to 100, A zeolite catalyst loaded with iron ions for the simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide using ammonia as a reducing agent, characterized in that the cation form in the zeolite is selected from sodium, ammonium and hydrogen. Manufacturing method. delete The method according to claim 1, In the step (B), the precursor material of iron ions uses iron nitrate hydrate (Fe (NO ₃ ) ₃ .9H ₂ O) to adjust the concentration to a molar concentration of 0.001 to 1.0 using ammonia as a reducing agent. A method for preparing a zeolite catalyst carrying iron ions for the simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide. The method according to claim 4, The zeolite treated in step (A) is added to the solution of the iron ion precursor material at a weight ratio of 0.1 to 3.0, and stirred at a temperature of 10 to 35 ° C. for 5 to 30 hours to use ammonia as a reducing agent. A method for producing a zeolite catalyst carrying iron ions for the simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide. The method according to claim 1, In step (C), the zeolite slurry of step (B) is filtered and the cake obtained is washed with 500 to 2000 ml of deionized distilled water, Zeolites containing iron ions obtained after washing are dried for 5 to 24 hours at a temperature of 100 to 120 ° C. in air to reduce nitrous oxide alone or to simultaneously reduce nitrous oxide and nitrogen monoxide using ammonia as a reducing agent. Method for preparing a zeolite catalyst loaded with iron ions. The method according to claim 1, The step (D) is iron ions for the simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide using ammonia, characterized in that repeating the (C) step 2 to 5 times in the step (B) as a reducing agent Method for producing this supported zeolite catalyst. The method according to claim 1, The step (E) is a nitrous oxide alone or nitrous oxide and nitrogen monoxide using ammonia as a reducing agent, characterized in that the zeolite that passed through the step (D) is calcined for 1 to 5 hours at a temperature of 400 ~ 600 ℃ in air Method of preparing a zeolite catalyst loaded with iron ions for simultaneous reduction of. delete According to the catalyst manufacturing method of any one of claims 1, 2, 4, 5, 6, 7, 8, the iron ion-supported zeolite is prepared to be activated, when using ammonia as a reducing agent alone in a temperature range of 300 ~ 400 ℃ 70 to 100% of nitrous oxide is reduced when reducing only the supplied nitrous oxide, and 70 to 100% of nitrous oxide and nitrogen monoxide when reducing the supplied nitrous oxide and nitrogen monoxide simultaneously. A zeolite catalyst carrying iron ions for the simultaneous reduction of nitrous oxide alone or nitrous oxide and nitrogen monoxide using ammonia as a reducing agent. After supplying nitrous oxide alone or simultaneously supplying nitrous oxide and nitrogen monoxide, the zeolite catalyst loaded with iron ions activated according to the catalyst production method according to any one of claims 1, 2, 4, 5, 6, 7, and 8 Reduction of nitrous oxide supplied alone at 70 to 100% at the catalytic reaction temperature of 300 ~ 400 ℃ by using ammonia as a reducing agent, or by reducing 70 to 100% of nitrous oxide and nitrogen monoxide simultaneously supplied at the same time. A method for simultaneously reducing nitrous oxide alone or nitrous oxide and nitrogen monoxide using ammonia as a reducing agent. delete

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