A low-temperature denitration catalyst and its preparation method and application

Abstract

The present invention relates to the technical field of denitration catalysts, and discloses a low-temperature denitration catalyst and a preparation method and application thereof, the method comprising the following steps: (1) mixing an active component precursor, a co-catalyst precursor, a binder and a solvent to obtain a slurry; (2) coating the slurry on a carrier surface, drying, and obtaining a catalyst precursor; (3) placing the catalyst precursor in water and applying a voltage as a working electrode; the carrier is a carbon-based carrier or a titanium-based carrier, the carbon-based carrier is a carbon material or a waste carbon-based catalyst, and the titanium-based carrier is titanium dioxide or a waste titanium-based catalyst. The present invention adopts an electrochemical method to replace the traditional roasting method to prepare an ultra-low temperature denitration catalyst, which greatly saves the catalyst preparation cost, and the low-temperature denitration catalyst has an excellent low-temperature catalytic efficiency; in addition, the low-temperature denitration catalyst can be prepared using waste carbon-based catalysts and waste titanium-based catalysts, thereby realizing the recycling of waste denitration catalysts.

Description

Technical Field

[0001] The present invention relates to the technical field of denitration catalysts, and in particular to a low-temperature denitration catalyst and a preparation method and application thereof. Background Art

[0002] With the development of human productivity, the demand for energy is also increasing. The use of energy is often accompanied by the generation of nitrogen oxides, including nitrogen oxides released from fossil fuels, nitrogen oxides generated by the reaction of nitrogen and oxygen in the air under high temperature conditions, and nitrogen oxides generated by the reaction of nitrogen and oxygen in the air during discharge. These nitrogen oxides cause acid rain and photochemical smog, which seriously endanger human health.

[0003] The most mature denitrification method at present is the selective catalytic reduction (SCR), which uses ammonia or urea to catalytically reduce nitrogen oxides. The catalyst is the key to SCR technology, and the most commonly used denitrification catalyst in SCR technology is a vanadium-based catalyst, that is, a catalyst with V2O5 as an active component, WO3 as an auxiliary agent, and TiO2 as a carrier. It is widely used in the power industry and automobile exhaust treatment. The working temperature of vanadium-based catalysts is 300-400℃, which is compatible with the flue gas temperature before entering the economizer (shell-and-tube heat exchanger for flue gas heat recovery) of conventional coal-fired boilers.

[0004] In order to reduce smog, major cities including Beijing have generally replaced coal with gas in heating boilers and other boilers. In other words, coal-fired boilers have been replaced with natural gas boilers. For natural gas boilers, since natural gas has been desulfurized before entering the boiler, the sulfur content in the boiler flue gas is low, and the exhaust does not need to consider SO X The dew point of the flue gas can be reduced to a very low temperature, usually around 120-180°C. And because the combustion of natural gas boilers is carried out in the gas phase throughout the entire process, the structure of a common natural gas boiler is a large shell-and-tube heat exchanger, and the combustion and flue gas heat recovery are carried out simultaneously, which is equivalent to a coal-fired boiler and an economizer in one. There is no high-temperature flue gas in front of the economizer like in a coal-fired boiler, and the existing vanadium-based catalyst cannot be used.

[0005] The current low-temperature denitrification catalyst is mainly a carbon-based catalyst with carbon materials as carriers, but the production method of carbon-based catalysts is still mainly based on the roasting method, or directly using precious metals (platinum or rhodium) as active substances. Among them, the carbon-based catalyst prepared by the roasting method is restricted by the roasting temperature (carbon materials usually begin to decompose at more than 350°C), and it is difficult to fully convert the active component precursor into the catalytic active component. In addition, the traditional roasting method consumes a lot of energy. The manufacturing cost of the SCR catalyst is largely derived from the catalyst roasting section; the use of precious metals platinum or rhodium as active substances greatly increases the cost. For traditional titanium-based catalysts, it is still difficult to ensure the denitrification efficiency in an ultra-low temperature environment by greatly increasing the content of active components. Excessive active component content causes the specific surface area of ​​the carrier to decrease sharply, reduces the gas contact site, and affects the reaction rate.

[0006] In addition, since the life of low-temperature carbon-based denitration catalysts is relatively short and difficult to regenerate, there will be a large number of waste carbon-based catalysts that need to be treated urgently. The specific surface area of ​​waste titanium-based denitration catalysts decreases significantly after repeated sintering, and the performance improvement after regeneration is not obvious. Therefore, there are also a large number of waste titanium-based denitration catalysts that need to be treated urgently. Summary of the invention

[0007] The purpose of the present invention is to overcome the problems in the prior art of high energy consumption, low cost or poor catalytic performance of the method for preparing a low-temperature denitration catalyst, and difficulty in recycling the waste denitration catalyst, and to provide a low-temperature denitration catalyst and a preparation method and application thereof. The method adopts an electro-removal method instead of a roasting method, so that not only a low-temperature denitration catalyst with excellent catalytic performance and low cost can be prepared, but also the waste denitration catalyst can be recycled.

[0008] In order to achieve the above object, the present invention provides a method for preparing a low-temperature denitration catalyst, which comprises the following steps:

[0009] (1) mixing an active component precursor, a co-catalyst precursor, a binder and a solvent to obtain a slurry;

[0010] (2) coating the slurry on the surface of a carrier and drying it to obtain a catalyst precursor;

[0011] (3) placing the catalyst precursor in water and applying voltage as a working electrode to generate active components and co-catalysts on the surface of the carrier;

[0012] Wherein, the carrier is a carbon-based carrier or a titanium-based carrier, the carbon-based carrier is a carbon material or a waste carbon-based catalyst, and the titanium-based carrier is titanium dioxide or a waste titanium-based catalyst;

[0013] The active component precursor is a manganese source and / or a nickel source, and the co-catalyst precursor is a cobalt source.

[0014] Preferably, in step (1), the active component precursor is selected from one or more of NaMn2O4, NaMnO2, Na2MnO3, KMnO4, K2MnO4, LiMn2O4, LiMn2O4 and K2NiO5, preferably NaMnO2;

[0015] Preferably, in step (1), the co-catalyst precursor is NaCoO2 and / or Na(CoO2)2.

[0016] Preferably, in step (1), the binder is one or more of polyvinylidene fluoride, carboxymethyl cellulose and polyacrylic acid binder;

[0017] Preferably, in step (1), the solvent is water or N-methylpyrrolidone.

[0018] Preferably, in step (1), the ratio of the sum of the weight of the active component precursor and the co-catalyst precursor to the weight of the binder is 1:0.05-0.3.

[0019] Preferably, the carbon material is carbon paper or carbon cloth;

[0020] Preferably, in step (2), the drying conditions include: a temperature of 60 to 140° C. and a drying time of 1 to 12 hours.

[0021] Preferably, when the carrier is a titanium-based carrier, step (1) comprises: mixing an active component precursor, a co-catalyst precursor, conductive carbon black, a binder and a solvent to obtain a slurry.

[0022] Preferably, step (3) specifically comprises: using the catalyst precursor as a working electrode of an electrochemical workstation, immersing a saturated calomel electrode as a reference electrode and a counter electrode in water, applying a voltage of 1.2 V, and maintaining the voltage for 0.1 to 10 hours.

[0023] The second aspect of the present invention provides a low-temperature denitration catalyst prepared by the method as described above, wherein the carrier of the low-temperature denitration catalyst is a carbon-based carrier or a titanium-based carrier, the active component is manganese oxide, and the promoter is cobalt oxide.

[0024] Preferably, the active component is one or more of manganese monoxide, manganese dioxide and manganese pentoxide;

[0025] Preferably, the co-catalyst is cobalt trioxide and / or cobalt monoxide;

[0026] Preferably, in the low-temperature denitration catalyst, the weight ratio of the active component to the carrier is 0.01 to 0.1:1, and the weight ratio of the co-catalyst to the carrier is 0.01 to 0.1:1;

[0027] Preferably, the operating temperature of the low-temperature denitration catalyst is lower than 200°C.

[0028] A third aspect of the present invention provides an application of the low-temperature denitration catalyst as described above in SCR technology.

[0029] In the technical solution provided by the present invention, a coating method is used to coat the co-catalyst precursor and the active component precursor on the surface of the carrier, and an external voltage is applied to de-ionize the catalyst and oxidize it into a high-valent metal oxide with catalytic activity, thereby preparing a low-temperature denitration catalyst. The present invention adopts an electrochemical method to replace the traditional roasting method to prepare an ultra-low temperature denitration catalyst, avoiding the problem of incomplete oxidation of the catalyst active component precursor, while greatly saving the catalyst preparation cost (the cost of electric heating of the kiln during the catalyst preparation process is extremely high), and the low-temperature denitration catalyst has excellent low-temperature catalytic efficiency.

[0030] In addition, the present invention can utilize waste carbon-based catalysts and waste titanium-based catalysts to prepare the low-temperature denitration catalyst, thereby solving the problem that low-temperature carbon-based catalysts and waste titanium-based denitration catalysts after repeated regeneration are difficult to recycle. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0033] The present invention provides a method for preparing a low-temperature denitration catalyst, which comprises the following steps:

[0034] (1) mixing an active component precursor, a co-catalyst precursor, a binder and a solvent to obtain a slurry;

[0035] (2) coating the slurry on the surface of a carrier and drying it to obtain a catalyst precursor;

[0036] (3) placing the catalyst precursor in water and applying voltage as a working electrode to generate active components and co-catalysts on the surface of the carrier;

[0037] Wherein, the carrier is a carbon-based carrier or a titanium-based carrier, the carbon-based carrier is a carbon material or a waste carbon-based catalyst, and the titanium-based carrier is titanium dioxide or a waste titanium-based catalyst;

[0038] The active component precursor is a manganese source and / or a nickel source, and the co-catalyst precursor is a cobalt source.

[0039] The present invention adopts a coating-electro-denitration method to prepare a low-temperature carbon-based denitration catalyst, changes the traditional roasting oxidation to electro-oxidation, avoids the problems of high energy consumption, low oxidation rate and difficult regeneration of the traditional roasting method; at the same time, waste titanium-based catalysts can be used as carriers, avoiding the problem of repeated roasting leading to no obvious improvement in catalytic performance after regeneration, and realizes the recycling of waste titanium-based denitration catalysts.

[0040] In the present invention, the inner and outer surfaces of the carrier provide a wide range of reaction sites, and the manganese oxide provides a catalytic active center; the original strong oxidizing property of manganese dioxide is adjusted by the loading modification of the co-catalyst, and the catalytic effect on the side reaction of producing nitrous oxide is reduced; by adopting the coating method, the catalyst active substances are more concentrated on the outer surface of the catalyst, the gas diffusion distance is reduced, and the reaction time is reduced. Therefore, the low-temperature denitration catalyst prepared by the present invention has good catalytic efficiency under low temperature (below 200°C) conditions.

[0041] In the present invention, the active component precursor is a manganese source and / or a nickel source. Specifically, the manganese source can be one or more of the metal layered oxides NaMn2O4, NaMnO2, Na2MnO3, KMnO4, K2MnO4, LiMn2O4 and LiMn2O4, and the nickel source can be K2NiO5.

[0042] In a specific embodiment, in step (1), the active component precursor is selected from one or more of NaMn2O4, NaMnO2, Na2MnO3, KMnO4, K2MnO4, LiMn2O4, LiMn2O4 and K2NiO5, preferably NaMnO2. By selecting NaMnO2, the production cost of the low-temperature denitrification catalyst is lower.

[0043] In the present invention, in step (1), the co-catalyst precursor is a cobalt source. The present invention does not limit the specific type of the cobalt source, as long as cobalt (Co) can be provided. In a specific embodiment, the cobalt source is NaCoO2 and / or Na(CoO2)2. That is, in step (1), the co-catalyst precursor can be NaCoO2 and / or Na(CoO2)2.

[0044] The present invention does not limit the specific type of the binder in step (1), and it can be a binder commonly used in the art. In a specific embodiment, in step (1), the binder is one or more of polyvinylidene fluoride (PVDF), carboxymethyl cellulose (CMC) and polyacrylic acid binder, preferably polyvinylidene fluoride, so that the raw material is easy to obtain, the cost is low, and the bonding performance is good. More specifically, the model of the polyacrylic acid binder is LA136D.

[0045] In a specific embodiment, in step (1), the solvent is water or N-methylpyrrolidone (NMP).

[0046] In a specific embodiment, step (1) comprises: mixing the active component precursor and the co-catalyst precursor with a binder and grinding them, and then mixing the obtained powder with a solvent.

[0047] In order to achieve a better bonding effect, in a preferred embodiment, in step (1), the ratio of the sum of the weight of the active component precursor and the co-catalyst precursor to the weight of the binder is 1:0.05-0.3.

[0048] The present invention does not limit the specific concentrations of the active component precursor and the catalyst precursor in the slurry, and the dosage relationship between the slurry and the carrier. In a preferred embodiment, the slurry is prepared and the dosage of the slurry and the carrier is designed according to the weight ratio of the active component to the carrier in the prepared low-temperature deNOx catalyst of 0.01 to 0.1:1.

[0049] The present invention does not limit the specific amount of the promoter precursor. In a preferred embodiment, the corresponding promoter precursor is weighed according to the weight ratio of the promoter to the carrier in the prepared low-temperature denitration catalyst of 0.01 to 0.1:1.

[0050] In the present invention, the carrier in step (2) is a carbon-based carrier or a titanium-based carrier, and the carbon-based carrier is a carbon material or a waste carbon-based catalyst. The present invention does not limit the specific type of the carbon material, and it can be a carbon material commonly used in the art. In a specific embodiment, the carbon material is carbon paper or carbon cloth.

[0051] In a specific embodiment, in step (2), the drying conditions include: a temperature of 60 to 140° C. and a time of 1 to 12 hours.

[0052] When the carrier used in step (2) is a titanium-based carrier, in a preferred embodiment, the slurry also contains conductive carbon black, which saves energy and reduces costs. That is, when the carrier is a titanium-based carrier, step (1) includes: mixing an active component precursor, a co-catalyst precursor, conductive carbon black, a binder and a solvent to obtain a slurry.

[0053] In a preferred embodiment, step (3) specifically includes: using the catalyst precursor as a working electrode of an electrochemical workstation, immersing a saturated calomel electrode as a reference electrode and a counter electrode in water, applying a voltage of 1.2 V, and maintaining it for 0.1 to 10 hours.

[0054] The present invention also proposes a low-temperature denitration catalyst prepared by the method as described above, wherein the carrier of the low-temperature denitration catalyst is a carbon-based carrier or a titanium-based carrier, the active component is manganese oxide, and the promoter is cobalt oxide.

[0055] Furthermore, the active component is one or more of manganese monoxide, manganese dioxide and manganese pentoxide.

[0056] Furthermore, the promoter is cobalt trioxide and / or cobalt monoxide.

[0057] In a preferred embodiment, in the low-temperature denitration catalyst, the weight ratio of the active component to the carrier is 0.01 to 0.1:1, and the weight ratio of the co-catalyst to the carrier is 0.01 to 0.1:1.

[0058] The low-temperature denitration catalyst provided by the present invention has high catalytic efficiency when the working temperature is lower than 200°C, so it can be used for denitration treatment of low-temperature flue gas. Preferably, the low-temperature denitration catalyst has a working temperature of 120-180°C.

[0059] The present invention also provides an application of the low-temperature denitration catalyst as described above in SCR technology, specifically for a denitration device using ammonia or urea as a reducing agent.

[0060] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0061] The waste carbon-based denitration catalysts in Examples 3 and 5 were from a coal-fired power plant in Jiangsu, and their catalytic activity was less than 60%. They were washed with water and dried.

[0062] The waste titanium-based denitration catalyst in Example 4 comes from a coal-fired power plant in Inner Mongolia.

[0063] Example 1

[0064] (1) 1 g of NaMnO2 and 0.5 g of NaCoO2 were mixed, 0.2 g of PVDF was added, and the mixture was ground for 15 min. Then, 4 ml of NMP was added and stirred to obtain a slurry.

[0065] (2) The slurry obtained in step (1) was evenly coated on 15 g of carbon paper and dried at 80° C. for 6 h to obtain a catalyst precursor.

[0066] (3) The catalyst precursor obtained in step (2) is used as the working electrode of the electrochemical workstation, and the calomel electrode is used as the reference electrode and the counter electrode. The two electrodes are immersed in water together, and a voltage of 1.2 V is applied. After maintaining for 1 hour, the working electrode is dried at 60° C. for 6 hours to obtain a low-temperature denitration catalyst.

[0067] Example 2

[0068] (1) 1 g of NaMn2O4 and 0.6 g of Na(CoO2)2 were mixed, 0.3 g of PVDF was added, and the mixture was ground for 30 min. Then, 6 ml of NMP was added and stirred to obtain a slurry.

[0069] (2) The slurry obtained in step (1) was evenly coated on 22 g of carbon paper and dried at 100° C. for 2 h to obtain a catalyst precursor.

[0070] (3) The catalyst precursor obtained in step (2) is used as the working electrode of the electrochemical workstation, and the calomel electrode is used as the reference electrode and the counter electrode. The two electrodes are immersed in water together, and a voltage of 1.2 V is applied. After maintaining for 10 h, the working electrode is dried at 80° C. for 3 h to obtain a low-temperature denitration catalyst.

[0071] Example 3

[0072] (1) 0.4 g NaMnO2 and 0.4 g NaCoO2 were mixed, 0.1 g CMC and 0.1 g polyacrylic acid binder (LA136D) were added, and the mixture was ground for 15 min. Then, 2 ml deionized water was added and stirred to obtain a slurry.

[0073] (2) The slurry obtained in step (1) is evenly coated on the waste carbon-based denitration catalyst, and dried at 120° C. for 1 h to obtain a catalyst precursor.

[0074] (3) The catalyst precursor obtained in step (2) is used as the working electrode of the electrochemical workstation, and the calomel electrode is used as the reference electrode and the counter electrode. The two electrodes are immersed in water together, and a voltage of 1.2 V is applied. After maintaining for 0.1 h, the working electrode electrode is dried at 100° C. for 3 h to obtain a low-temperature denitration catalyst.

[0075] Example 4

[0076] (1) 1 g of NaMnO2, 0.5 g of NaCoO2, and 0.2 g of conductive carbon black were mixed, 0.2 g of PVDF was added, and the mixture was ground for 15 min. Then, 4 ml of NMP was added and stirred to obtain a slurry.

[0077] (2) The slurry obtained in step (1) was evenly coated on 15 g of waste titanium-based denitration catalyst, and dried at 80° C. for 6 h to obtain a catalyst precursor.

[0078] (3) The catalyst precursor obtained in step (2) is used as the working electrode of the electrochemical workstation, and the calomel electrode is used as the reference electrode and the counter electrode. The two electrodes are immersed in water together, and a voltage of 1.2 V is applied. After maintaining for 1 hour, the working electrode is dried at 60° C. for 6 hours to obtain a low-temperature denitration catalyst.

[0079] Example 5

[0080] The method described in Example 1 is followed, except that the carbon paper in step (2) is replaced with a waste carbon-based denitration catalyst.

[0081] Specifically, the preparation method comprises the following steps:

[0082] (1) Add 1 g of NaMnO2 to 0.2 g of PVDF and grind for 15 min. Then, add 4 ml of NMP and stir evenly to obtain a slurry.

[0083] (2) The slurry obtained in step (1) was evenly coated on 15 g of waste carbon-based denitration catalyst, and dried at 80° C. for 6 h to obtain a catalyst precursor.

[0084] (3) The catalyst precursor obtained in step (2) is used as the working electrode of the electrochemical workstation, and the calomel electrode is used as the reference electrode and the counter electrode. The two electrodes are immersed in water together, and a voltage of 1.2 V is applied. After maintaining for 1 hour, the working electrode is dried at 60° C. for 6 hours to obtain a low-temperature denitration catalyst.

[0085] Comparative Example 1

[0086] The process was carried out in the same manner as described in Example 1, except that no co-catalyst precursor was added.

[0087] Test Case

[0088] The low-temperature denitration catalysts prepared in Examples 1-5 and the carriers used in Examples 3-5 (ie, the waste carbon-based denitration catalysts and the waste titanium-based denitration catalysts) were tested for catalyst activity.

[0089] The test method is:

[0090] The pollutant control reaction atmosphere is used as the treatment object, that is, the SCR reaction atmosphere exists in the reaction atmosphere, and the components of the reaction atmosphere contain 500ppm of NO. To ensure the progress of the SCR reaction, NH3 is sprayed into the reaction atmosphere (the amount of NH3 sprayed is the same as the NO content in the reaction atmosphere), and O2 is introduced (the amount of O2 introduced accounts for 5% of the total volume flow of the reaction atmosphere), and N2 is used as the balance gas; the total gas flow rate of the reaction atmosphere is 1Nm 3 .h -1 .

[0091] The catalyst sample was placed in a tubular reactor, and the reaction was carried out in the range of 100-200°C under the above atmosphere (the reaction was started from 100°C and the temperature was raised by program, and finally the temperature was raised to 200°C). During the reaction, starting from the starting temperature, each certain temperature was taken as a test temperature point (for example, 120°C, 140°C, 160°C and 180°C), and the temperature was kept constant for 1h at each test temperature point. After the reaction entered a stable state, the gas components at the reactor inlet and reactor outlet were tested using a Fourier transform infrared gas analyzer (GASMET, Finland, model DX-4000). The NOx conversion rate was calculated by the following formula and the conversion rate, respectively, and the results are shown in the table.

[0092]

[0093] Among them, M0 is the NOx concentration at the reactor inlet; M1 is the NOx concentration at the reactor outlet. x concentration;

[0094] The test results are shown in Table 1.

[0095] Table 1

[0096]

[0097] It can be seen from the results in Table 1 that the low-temperature denitration catalyst prepared in the embodiment of the present invention has excellent catalytic activity at a temperature of 120 to 180°C.

[0098] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for preparing a low-temperature denitration catalyst, characterized in that: The method comprises the following steps: (1) mixing an active component precursor, a co-catalyst precursor, a binder and a solvent to obtain a slurry; (2) coating the slurry on the surface of the carrier and drying it to obtain a catalyst precursor; (3) placing the catalyst precursor in water and applying voltage as a working electrode to generate active components and co-catalysts on the surface of the carrier; Wherein, the carrier is a carbon-based carrier or a titanium-based carrier, the carbon-based carrier is a carbon material or a waste carbon-based catalyst, and the titanium-based carrier is titanium dioxide or a waste titanium-based catalyst; In step (1), the co-catalyst precursor is NaCoO2, the binder is one or more of polyvinylidene fluoride, carboxymethyl cellulose and polyacrylic acid binder, and the solvent is water or N-methylpyrrolidone; In step (1), the active component precursor is selected from one or more of NaMn2O4, NaMnO2, Na2MnO3, KMnO4, K2MnO4, LiMn2O4 and K2NiO5.

2. The method according to claim 1, characterized in that The active component precursor is NaMnO2.

3. The method according to claim 1, characterized in that In step (1), the ratio of the sum of the weight of the active component precursor and the co-catalyst precursor to the weight of the binder is 1:0.05-0.

3.

4. The method according to claim 1, characterized in that: The carbon material is carbon paper or carbon cloth.

5. The method according to claim 1 or 4, characterized in that: In step (2), the drying conditions include: temperature of 60-140° C. and time of 1-12 h.

6. The method according to claim 1, characterized in that When the carrier is a titanium-based carrier, step (1) comprises: mixing an active component precursor, a co-catalyst precursor, conductive carbon black, a binder and a solvent to obtain a slurry.

7. The method according to claim 1, characterized in that Step (3) specifically includes: using the catalyst precursor as a working electrode of an electrochemical workstation, immersing a saturated calomel electrode as a reference electrode and a counter electrode in water, applying a voltage of 1.2 V, and maintaining it for 0.1 to 10 hours.

8. A low-temperature denitration catalyst prepared by the method according to any one of claims 1 to 7, wherein: The carrier of the low-temperature denitration catalyst is a carbon-based carrier or a titanium-based carrier, the active component is manganese oxide, and the promoter is cobalt oxide.

9. The low-temperature denitration catalyst according to claim 8, characterized in that: The active component is one or more of manganese monoxide, manganese dioxide and manganese pentoxide.

10. The low-temperature denitration catalyst according to claim 8, characterized in that: The promoter is cobalt trioxide and / or cobalt monoxide.

11. The low-temperature denitration catalyst according to claim 8, characterized in that: In the low-temperature denitration catalyst, the weight ratio of the active component to the carrier is 0.01-0.1:1, and the weight ratio of the co-catalyst to the carrier is 0.01-0.1:

1.

12. The low-temperature denitration catalyst according to claim 10, characterized in that: The operating temperature of the low-temperature denitration catalyst is lower than 200°C.

13. Use of the low-temperature denitration catalyst according to any one of claims 8 to 12 in SCR technology.

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