A denitration catalyst and its preparation method

Abstract

The present invention relates to the technical field of SCR denitration catalysts, and in particular to a denitration catalyst and a preparation method thereof. The denitration catalyst has a general formula of A-Ag2O / B, wherein A represents at least three of manganese, samarium, holmium and indium oxides, and B represents anatase nano-TiO2 and nano-H-Sb-Mo-O X The denitration catalyst of the present invention uses Ag plus at least three of manganese, samarium, holmium and indium as active components, which significantly improves the B acid content and redox performance of the catalyst. At the same time, the efficient synergistic effect between the active component and the carrier significantly improves the sulfur resistance of the catalyst. 3 and 0-10% water vapor, temperature 120-350℃, space velocity 120000h -1 When the catalyst has a denitrification efficiency of ≥93%, a N2 selectivity of ≥90%, and a flue gas temperature of 120°C and a concentration of 500mg / m 3 Under the conditions of flue gas containing 10% water vapor, the minimum increase in sulfur content on the catalyst surface is only 0.2ppm after continuous operation for 200h.

Description

A denitration catalyst and its preparation method Technical Field

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

[0002] As China vigorously develops clean coal technologies and advocates for ultra-low emissions, it is strengthening its control over pollutant emissions from coal-fired units. This has made full-load denitrification a necessity for coal-fired power plants. Selective catalytic reduction (SCR) technology is the mainstream technology for denitrification projects in coal-fired boilers and has been widely used in coal-fired power plants across my country.

[0003] In recent years, the ultra-low emission transformation of my country's coal-fired power plants has been basically completed, and the focus of my country's air pollution control has gradually shifted to non-electric sectors such as steel, coking, glass, and cement. At present, various provinces have successively introduced more stringent emission standards for non-electric sectors. For example, Henan Province has implemented "ultra-low emissions" for non-electric sectors, stipulating that the nitrogen oxide concentration emission of steel, cement, coking, and ceramic industries shall not exceed 100mg / m 3 , carbon industry is not higher than 50mg / m 3 .

[0004] Installing an SCR denitrification system in relatively clean flue gas can effectively reduce catalyst poisoning, extend catalyst life, and lower SCR denitrification operating costs. However, the low temperature of purified flue gas leads to low activity and severe ammonium bisulfate poisoning in existing denitrification catalysts, severely impacting their efficient and stable operation. Furthermore, online thermal regeneration of the catalyst increases operating costs. Therefore, the development of SCR denitrification catalysts with high low-temperature activity and strong resistance to sulfur poisoning has become a research hotspot in recent years.

[0005] Among the many new low-temperature catalysts, manganese-based, copper-based, and cerium-based are more common. For example, Chinese invention patent CN102989465A discloses a CeO-CuO catalyst and its preparation method. The catalyst exhibits good denitrification efficiency at a temperature of 125-275°C. Chinese invention patent CN103055889A discloses a MnO X-CuO-TiO2 catalyst and its preparation method, which exhibits good denitration efficiency in flue gas at 150-250°C. Currently, research on low-temperature denitration catalysts focuses on their low-temperature denitration activity under sulfur-resistant conditions. For example, Chinese invention patent CN102716752A discloses a preparation method for a low-temperature SCR denitration catalyst. This denitration catalyst maintains good nitrogen oxide removal efficiency and water and sulfur resistance at flue gas temperatures between 150-250°C. Chinese invention patent CN104138761A discloses a sulfur-resistant membrane-type low-temperature denitration catalyst and its preparation method, effectively addressing the problem of low-temperature SCR catalyst poisoning. This catalyst achieves a denitration rate of over 90% within the temperature range of 140-200°C. Chinese invention patent CN 115193442A enhances the surface acidity of Fe2O3 through Mo doping, improving denitration efficiency and reducing the catalyst's adsorption of SO2, thereby preventing the adsorption and deposition of ammonium bisulfate on the surface. Furthermore, it utilizes NH3 to reduce metal substances, achieving the decomposition of ammonium bisulfate at low temperatures. However, the above studies are unable to fundamentally solve the problems of sulfur poisoning and service life of low-temperature SCR catalysts, thereby limiting the development of SCR low-temperature denitrification catalysts.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The object of the present invention is to provide a denitration catalyst and a preparation method thereof, wherein the denitration catalyst exhibits excellent low-temperature denitration activity and sulfur resistance.

[0008] In the first aspect, the present invention provides a denitration catalyst having a general formula of A-Ag2O / B, wherein A represents at least three of manganese, samarium, holmium and indium oxides, and B represents anatase nano-TiO2 and nano-H-Sb-Mo-O X mixture.

[0009] The denitration catalyst of the present invention uses Ag plus at least three of manganese, samarium, holmium and indium as active components, which significantly improves the B acid content and redox performance of the catalyst; in addition, the present invention uses anatase nano-TiO2 and nano-H-Sb-Mo-O X mixture as the support, H-Sb-Mo-O X The carrier has a stable hexagonal pore structure and strong acidity, and has a deformed layered structure, which effectively inhibits the adsorption of acidic gases such as SO2 and SO3 on the catalyst surface, and greatly promotes the catalyst's absorption of surface NH 4 + The adsorption of ions realizes the ability to self-decompose ammonium bisulfate / ammonium sulfate, and uses it together with anatase nano-TiO2 as a carrier to fundamentally improve the sulfur resistance of the catalyst.

[0010] Studies have shown that in the denitration catalyst, when the mass ratio of A, Ag2O and B is (2-10): (1-5): 100, anatase nano-TiO2 and nano-H-Sb-Mo-O X When the mass ratio of the carrier to the active component is 100:(0.5-10), the synergistic effect between the carrier and the active component is the strongest, which is beneficial to adjusting the B acid and L acid sites of the catalyst, thereby improving the catalytic activity and sulfur resistance of the denitrification catalyst.

[0011] In a second aspect, the present invention further discloses a method for preparing the above-mentioned denitration catalyst, which should also fall within the scope of protection of the present invention. The preparation method specifically comprises the following steps:

[0012] S1, anatase nano-TiO2 and nano-H-Sb-Mo-O X Mix well to obtain a mixed carrier:

[0013] S2. Completely dissolving the A source and the Ag source in deionized water, pouring the mixture into the mixed carrier, and stirring evenly to prepare a paste;

[0014] S3, sequentially subjecting the paste to ultrasonic treatment, drying, calcination and grinding to obtain catalyst powder;

[0015] S4. Adding a molding aid, a pore-forming agent, and glass fiber to the catalyst powder, and subjecting the catalyst to aging, pre-dosing, extrusion, drying, and calcination to obtain a denitration catalyst.

[0016] The honeycomb-type low-temperature denitration catalyst prepared using the above-mentioned method exhibits excellent low-temperature denitration activity and sulfur resistance, resolving the problems of low low-temperature activity, weak sulfur resistance, and high operating costs associated with existing denitration catalysts. Furthermore, the preparation process is simple, low-cost, and suitable for industrial applications in various low-temperature environments.

[0017] Wherein, in step S1, the nano H-Sb-Mo-O X The preparation method comprises:

[0018] The antimony source and molybdenum source were dissolved in oxalic acid solution, and the pH value of the solution was adjusted to 0.5-1 with hydrochloric acid. Ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a reaction kettle and kept at 160-180°C for 24-72 hours. The obtained sample was filtered, dried, calcined and ground in sequence to obtain nano H-Sb-Mo-O X .

[0019] The present invention adopts the hydrothermal synthesis method, under the control of the template agent, to prepare the nano H-Sb-Mo-O XThe carrier has a stable hexagonal pore structure and strong acidity, and has a deformed layered structure, which effectively inhibits the adsorption of acidic gases such as SO2 and SO3 on the catalyst surface, and greatly promotes the catalyst's absorption of surface NH 4+ The adsorption of ions realizes the ability of self-decomposition of ammonium bisulfate / ammonium sulfate. Therefore, using it together with anatase nano-TiO2 as a carrier fundamentally improves the sulfur resistance of the catalyst. At the same time, the present invention is used in the preparation of nano H-Sb-Mo-O X There is no need to wash the carrier, which is more green and environmentally friendly.

[0020] In nano H-Sb-Mo-O X In the preparation method, the mass concentration of oxalic acid is not strictly limited, and is preferably 4-6%; and during calcination, the temperature is controlled to be 450-550°C and the time is preferably 3-8 hours; finally, the obtained nano H-Sb-Mo-O X The particle size is greater than 1000 mesh.

[0021] After the oxalic acid solution of antimony trichloride solution and ammonium heptamolybdate solution is adjusted to acidic, ethylenediamine-ethanol-ethyl silicate solution is added to effectively control the H-Sb-Mo-O X In order to determine the formation and size of the grain structure, the volume ratio of ethylenediamine, ethanol and ethyl silicate is 10: (50-100): (0.5-2).

[0022] In order to further improve the efficient synergistic effect between the active component and the carrier, in step S3 of the present technical solution, the ultrasonic treatment time is preferably 2-5 hours at a frequency of 100kHz-500kHz;

[0023] In addition, the present invention does not strictly limit the drying and calcining conditions of the paste. During the drying, the temperature is preferably controlled at 60-80°C and the time is 12-24 hours; during the calcination, the temperature is preferably controlled at 450-600°C and the time is 3-6 hours.

[0024] As a preferred embodiment of the present technical solution, in step S3, the particle size of the catalyst powder is 200-600 mesh.

[0025] Finally, forming aids, pore-forming agents, glass fibers and other materials are added to the catalyst powder, and after aging, drying and calcination are performed. Steam drying is preferred because steam drying can effectively control cracking caused by excessive evaporation on the surface of the honeycomb catalyst. The steam drying temperature is preferably 35-45°C and the time is preferably 240-480h. After steam drying, calcination is performed, and the temperature is controlled at 400-500°C and the time is 48-72h.

[0026] The molding aids here include surfactants and binders, among which the surfactants mainly play the role of emulsification and dispersion, including any one or more of glyceryl monostearate, lauric acid, polyether, glyceryl monostearate and fluorinated silicone; the binders include any one or more of carboxymethyl cellulose, ammonium polyacrylate, hydroxypropyl methylcellulose, aminocellulose, aluminum sol and silica sol, and the pore-forming agents mainly play the role of micropore modification, mainly including any one or more of starch, activated carbon powder, chitosan, polymethacrylate and methyl methacrylate.

[0027] The denitration catalyst of the present invention has at least the following technical effects:

[0028] 1. The honeycomb-type low-temperature denitration catalyst of the present invention uses Ag plus at least three of manganese, samarium, holmium, and indium as active components, significantly improving the catalyst's B acid content and redox performance. Simultaneously, the efficient synergistic effect between the active component and the carrier significantly improves the catalyst's sulfur resistance, thus resolving the problems of low low-temperature activity, weak sulfur resistance, and high operating costs of existing denitration catalysts.

[0029] 2. In the denitration catalyst of the present invention, H-Sb-Mo-O X The carrier has a stable hexagonal pore structure and strong acidity, and has a deformed layered structure, which can effectively inhibit the adsorption of acidic gases such as SO2 and SO3 on the catalyst surface, greatly promoting the catalyst's absorption of surface NH 4+ The adsorption of ions realizes the ability to self-decompose ammonium bisulfate / ammonium sulfate, and uses it together with anatase nano-TiO2 as a carrier to fundamentally improve the sulfur resistance of the catalyst;

[0030] 3. The denitration catalyst of the present invention exhibits good denitration activity and sulfur resistance, and contains 0-500mg / m 3 and 0-10% water vapor, temperature 120-350℃, space velocity 120000h -1 When the catalyst denitrification efficiency is ≥93%, N2 selectivity is ≥90%, and the flue gas temperature is 120℃ and 500mg / m 3 Under flue gas conditions containing 10% water vapor, the catalyst surface sulfur content increased by a minimum of 0.2 ppm after 200 hours of continuous operation. This denitrification catalyst meets the ultra-low nitrogen oxide emission requirements of non-electrical industries such as steel, coking, and glass, and has broad application prospects in this field. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular also includes the plural. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1:

[0035] The composition ratio of the denitrification catalyst is:

[0036] The mass ratio of MnO2:Sm2O3:Ho2O3:In2O3 is 1:0.15:0.2:0.15;

[0037] The mass ratio of A:AgO2:B oxides is 8:2.5:100;

[0038] TiO2:H-Sb-Mo-O X The mass ratio is 100:8.

[0039] Nano H-Sb-Mo-O X Preparation of vector

[0040] A certain amount of antimony trichloride solution and ammonium heptamolybdate solution were dissolved in 5% oxalic acid solution, and the pH of the solution was adjusted to 0.5 with hydrochloric acid solution. A certain amount of ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a sealed reactor and kept at 165°C for 65 hours. The sample was filtered, dried, calcined at 450°C for 4 hours, and ground to a particle size of 1200 mesh to obtain nano H-Sb-Mo-O X carrier.

[0041] Preparation of denitrification catalyst:

[0042] S1, weigh anatase nano-TiO2 powder and nano-H-Sb-Mo-O X powder, and mix the two evenly;

[0043] S2. Weigh a certain amount of manganese, samarium, holmium, indium, and Ag salts, completely dissolve them in deionized water, pour them into the semi-dry powder prepared in step S1, and stir evenly to prepare a paste;

[0044] S3, the paste was subjected to high-frequency ultrasound at 450 kHz for 5 h, dried at 70° C. for 24 h, calcined at 550° C. for 6 h, and ground to a particle size of 600 mesh to obtain a catalyst powder;

[0045] S4. Add molding aids, pore-forming agents, and glass fibers to the catalyst powder, perform aging, pre-extrusion, and extrusion, and then steam dry at 35°C for 480 hours and calcine at 450°C for 72 hours to obtain a honeycomb low-temperature denitration catalyst.

[0046] Example 2:

[0047] The composition ratio of the denitrification catalyst is:

[0048] The mass ratio of MnO2:Sm2O3:Ho2O3 is 1:0.1:0.1;

[0049] The mass ratio of A:AgO2:B oxides is 2:1:100;

[0050] TiO2:H-Sb-Mo-O X The mass ratio is 100:0.5.

[0051] Nano H-Sb-Mo-O X Preparation of vector

[0052] A certain amount of antimony trichloride solution and ammonium heptamolybdate solution were dissolved in 5% oxalic acid solution, and the pH of the solution was adjusted to 0.5 with hydrochloric acid solution. A certain amount of ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a sealed reactor and kept at 180°C for 72 hours. The sample was filtered, dried, calcined at 550°C for 3 hours, and ground to a particle size of 1000 mesh to obtain nano H-Sb-Mo-O X carrier.

[0053] Preparation of denitrification catalyst:

[0054] S1, weigh anatase nano-TiO2 powder and nano-H-Sb-Mo-O X powder, and mix the two evenly;

[0055] S2. Weigh a certain amount of manganese, samarium, holmium, and Ag salts, completely dissolve them in deionized water, pour them into the semi-dry powder prepared in step S1, and stir evenly to prepare a paste;

[0056] S3, the paste was subjected to high-frequency ultrasound at 100 Hz for 2 h, dried at 80° C. for 24 h, calcined at 450° C. for 6 h, and ground to a particle size of 600 mesh to obtain a catalyst powder;

[0057] S4. Add molding aids, pore-forming agents, and glass fibers to the catalyst powder, perform aging, pre-extrusion, and extrusion, steam dry at 40°C for 240 hours, and calcinate at 500°C for 48 hours to obtain a honeycomb low-temperature denitrification catalyst.

[0058] Example 3:

[0059] The composition ratio of the denitrification catalyst is:

[0060] The mass ratio of MnO2:Ho2O3:In2O3 is 1:0.5:0.2;

[0061] The mass ratio of A:AgO2:B oxides is 8:5:100;

[0062] TiO2:H-Sb-Mo-O X The mass ratio is 100:5.

[0063] Nano H-Sb-Mo-O X Preparation of vector

[0064] A certain amount of antimony trichloride solution and ammonium heptamolybdate solution were dissolved in 5% oxalic acid solution, and the pH of the solution was adjusted to 0.5 with hydrochloric acid solution. A certain amount of ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a sealed reactor and kept at 180°C for 24 hours. The sample was filtered, dried, calcined at 480°C for 4 hours, and ground to a particle size of 1100 mesh to obtain nano H-Sb-Mo-O X carrier.

[0065] Preparation of denitrification catalyst:

[0066] S1, weigh anatase nano-TiO2 powder and nano-H-Sb-Mo-O X powder, and mix the two evenly;

[0067] S2. Weigh a certain amount of manganese, holmium, indium, and Ag salts, completely dissolve them in deionized water, pour them into the semi-dry powder prepared in step S1, and stir evenly to prepare a paste;

[0068] S3, subjecting the paste to high-frequency ultrasound at 200 kHz for 3 h, drying at 60° C. for 20 h, calcining at 500° C. for 6 h, and grinding to a particle size of 500 mesh to obtain catalyst powder;

[0069] S4. Add molding aids, pore-forming agents, and glass fibers to the catalyst powder, perform aging, pre-extrusion, and extrusion, and then steam dry at 45° C. for 300 h and calcine at 400° C. for 50 h to obtain a honeycomb low-temperature denitration catalyst.

[0070] Example 4:

[0071] The composition ratio of the denitrification catalyst is:

[0072] The mass ratio of MnO2:Sm2O3:In2O3 is 0.01:0.1:1;

[0073] The mass ratio of A:AgO2:B oxides is 5:.7:100;

[0074] TiO2:H-Sb-Mo-O X The mass ratio is 100:10.

[0075] Nano H-Sb-Mo-O X Preparation of vector

[0076] A certain amount of antimony trichloride solution and ammonium heptamolybdate solution were dissolved in 5% oxalic acid solution, and the pH of the solution was adjusted to 0.5 with hydrochloric acid solution. A certain amount of ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a sealed reactor and kept at 160°C for 65 hours. The sample was filtered, dried, calcined at 450°C for 8 hours, and ground to a particle size of 1000 mesh to obtain nano H-Sb-Mo-O X carrier.

[0077] Preparation of denitrification catalyst:

[0078] S1, weigh anatase nano-TiO2 powder and nano-H-Sb-Mo-O X powder, and mix the two evenly;

[0079] S2. Weigh a certain amount of manganese, samarium, indium, and Ag salts, completely dissolve them in deionized water, pour them into the semi-dry powder prepared in step S1, and stir them evenly to prepare a paste;

[0080] S3, the paste was subjected to high-frequency ultrasound at 500 kHz for 4 h, dried at 68° C. for 15 h, calcined at 500° C. for 4 h, and ground to a particle size of 600 mesh to obtain a catalyst powder;

[0081] S4. Add molding aid, pore-forming agent and glass fiber to the catalyst powder, perform aging, pre-extrusion and extrusion, dry it at 30°C for 480h and calcine it at 430°C for 55h to obtain a honeycomb low-temperature denitration catalyst.

[0082] Example 5:

[0083] The composition ratio of the denitrification catalyst is:

[0084] The mass ratio of MnO2:Sm2O3:Ho2O3:In2O3 is 1:0.05:0.2:0.15;

[0085] The mass ratio of A:AgO2:B oxides is 9:3:100;

[0086] TiO2:H-Sb-Mo-OX The mass ratio is 100:3.

[0087] Nano H-Sb-Mo-O X Preparation of vector

[0088] A certain amount of antimony trichloride solution and ammonium heptamolybdate solution were dissolved in 5% oxalic acid solution, and the pH of the solution was adjusted to 0.5 with hydrochloric acid solution. A certain amount of ethylenediamine-ethanol-ethyl silicate solution was added. The solution was poured into a sealed reactor and kept at 170°C for 45 hours. The sample was filtered, dried, calcined at 520°C for 6.5 hours, and ground to a particle size of 1500 mesh to obtain nano H-Sb-Mo-O X carrier.

[0089] Preparation of denitrification catalyst:

[0090] S1, weigh anatase nano-TiO2 powder and nano-H-Sb-Mo-O X powder, and mix the two evenly;

[0091] S2. Weigh a certain amount of manganese, samarium, holmium, indium, and Ag salts, completely dissolve them in deionized water, pour them into the semi-dry powder prepared in step S1, and stir evenly to prepare a paste;

[0092] S3, the paste was subjected to high-frequency ultrasound at 300 kHz for 3.5 h, dried at 75° C. for 12 h, calcined at 600° C. for 3 h, and ground to a particle size of 400 mesh to obtain a catalyst powder;

[0093] S4. Add molding aids, pore-forming agents, and glass fibers to the catalyst powder, perform aging, pre-extrusion, and extrusion, and then steam dry at 33°C for 400 hours and calcine at 480°C for 60 hours to obtain a honeycomb low-temperature denitration catalyst.

[0094] Comparative Example 1

[0095] Anatase nano-TiO2 is selected as the carrier;

[0096] The composition of A-Ag2O is the same as that of Example 1;

[0097] Other preparation processes and parameters are the same as in Example 1.

[0098] Comparative Example 2

[0099] The composition of carrier B is the same as that of Example 1;

[0100] The active components are MnO2:Sm2O3:Ho2O3:In2O3 with a mass ratio of 1:0.15:0.2:0.15;

[0101] Other preparation processes and parameters are the same as in Example 1.

[0102] Comparative Example 3

[0103] The composition of carrier B is the same as that of Example 1;

[0104] The active components are CeO2:Ho2O3:In2O3 with a mass ratio of 1.15:0.2:0.15;

[0105] Other preparation processes and parameters are the same as in Example 1.

[0106] The catalytic effect of the above-mentioned denitration catalyst was tested under the following test conditions:

[0107] 500mg / m3 was introduced into the flue gas 3 and 10% water vapor, temperature 120-350℃, space velocity 120000h -1 , test the denitrification efficiency and N2 selectivity of the catalyst; at a flue gas temperature of 120℃ and 500mg / m 3 Under the flue gas conditions of 10% water vapor and 10% water vapor, the catalyst was operated continuously for 200 hours, and the increase in sulfur content on the catalyst surface was tested using a carbon-sulfur analyzer. The test results are shown in Table 1.

[0108] Table 1 Test results

[0109] Denitrification efficiency % N2 selectivity % Sulfur content increase ppm Example 1 96.2 98.10.2 Example 2 93.2 90.8 13 Example 3 93.9 97.63 Example 4 93.5 98.6 0.6 Example 5 95.7 99.0 6.1 Control example 1 85.7 93.0 1 368 Control example 2 75.7 71.6 68 Control example 3 68.3 79.9 2 surface

[0110] In summary, the denitration catalyst prepared by the present invention exhibits good denitration activity and sulfur resistance, and contains 0-500mg / m 3 and 0-10% water vapor, temperature 1201350℃, space velocity 120000h -1 When the catalyst denitrification efficiency is ≥93%, N2 selectivity is ≥90%, and the flue gas temperature is 120℃ and 500mg / m 3 Under the conditions of flue gas containing 10% water vapor, the minimum increase in sulfur content on the catalyst surface is only 0.2ppm after continuous operation for 200h.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A denitration catalyst, characterized in that: The general formula of the denitration catalyst is A-Ag2O / B, wherein A represents at least three of manganese, samarium, holmium and indium oxides, and B represents anatase nano-TiO2 and nano-H-Sb-Mo-O X mixture; the nano H-Sb-Mo-O X The preparation method comprises: dissolving an antimony source and a molybdenum source in an oxalic acid solution, adjusting the pH value of the solution to 0.5-1 with hydrochloric acid, adding an ethylenediamine-ethanol-ethyl silicate solution; pouring the solution into a reaction kettle, and heat-treating at 160-180°C for 24-72 hours; filtering, drying, calcining and grinding the obtained sample in sequence to obtain nano H-Sb-Mo-O X During the calcination, the temperature is controlled at 450-550°C and the time is 3-8h.

2. The denitration catalyst according to claim 1, characterized in that In the denitration catalyst, the mass ratio of A, Ag2O and B is (2-10): (1-5):

100.

3. The denitration catalyst according to claim 1, characterized in that In the denitration catalyst, anatase nano-TiO2 and nano-H-Sb-Mo-O X The mass ratio is 100:(0.5-10).

4. The method for preparing the denitration catalyst according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, anatase nano-TiO2 and nano-H-Sb-Mo-O X Mixing uniformly to obtain a mixed carrier: S2, completely dissolving the A source and the Ag source in deionized water, pouring the mixture into the mixed carrier, and stirring uniformly to obtain a paste; S3, sequentially subjecting the paste to ultrasonic treatment, drying, calcination, and grinding to obtain a catalyst powder; S4. Adding a molding aid, a pore-forming agent, and glass fiber to the catalyst powder, and subjecting the catalyst to aging, pre-dosing, extrusion, drying, and calcination to obtain a denitration catalyst.

5. The preparation method according to claim 4, characterized in that In the ethylenediamine-ethanol-ethyl silicate solution, the volume ratio of ethylenediamine, ethanol and ethyl silicate is 10:(50-100):(0.5-2).

6. The preparation method according to claim 4, characterized in that In step S3, during the ultrasonication, the frequency is controlled to be 100kHz-500kHz and the time is 2-5h; during the drying, the temperature is controlled to be 60-80°C and the time is 12-24h; during the calcination, the temperature is controlled to be 450-600°C and the time is 3-6h.

7. The preparation method according to claim 4, characterized in that In step S3, the particle size of the catalyst powder is 200-600 mesh.

8. The preparation method according to claim 4, characterized in that In step S4, the drying is steam drying, and the temperature is 35-45° C. and the time is 240-480 hours.

9. The preparation method according to claim 4, characterized in that In step S4, during the calcination, the temperature is controlled to be 400-500° C. and the time is 48-72 hours.