Anti-high-arsenic-poisoning denitration catalyst and preparation method thereof

Abstract

The present application relates to the technical field of SCR denitration catalyst, in particular to a high-arsenic-poisoning-resistant denitration catalyst and a preparation method thereof, the catalyst comprising a carrier, an active component and a promoter, the mass ratio of the active component, the promoter and the carrier being (2-10):(2-5):100; wherein the carrier is an oxide of titanium and silicon, the active component is an oxide of vanadium, iron, niobium and strontium, and the promoter is an antimony oxide; the present application constructs a multi-component composite oxide denitration catalyst prepared by a self-assembly method, inhibits the adsorption and enrichment of As2O3 in the catalyst channel, and greatly reduces the deposition of arsenic on the catalyst surface; therefore, the catalyst prepared by the present application has strong arsenic-poisoning-resistant performance, and has a low SO2 / SO3 oxidation rate, effectively making up for the defects of traditional denitration catalysts, such as easy arsenic poisoning and high SO2 / SO3 oxidation rate, and can be widely applied to the emission control of nitrogen oxides under the flue gas conditions of high-arsenic coal units, metallurgical industries and the like.

Description

Technical Field

[0001] This invention relates to the field of SCR denitrification catalyst technology, and in particular to a denitrification catalyst resistant to high arsenic poisoning and its preparation method. Background Technology

[0002] Arsenic poisoning in denitrification catalysts refers to the process where organic arsenic, arsenic pyrite, or arsenic sulfide in coal are converted into gaseous As₂O₃ during combustion. When As₂O₃ deposits on the surface of the denitrification catalyst, it not only covers the active sites of the catalyst but also reduces its reduction performance and surface acidity, leading to significant deactivation of the catalyst. Studies have shown that if the mass fraction of arsenic in coal exceeds 3 × 10⁻⁶, the catalyst's activity will be significantly deactivated. -6 The lifespan of SCR catalysts will decrease by approximately 30%. This decline in catalyst activity will adversely affect the operation of the denitrification system and downstream equipment, and may even lead to NO emissions. X Exceeding emission standards.

[0003] Patent CN201810371240.0 discloses a denitrification catalyst with improved resistance to arsenic poisoning and its preparation method. By introducing an arsenic-resistant additive during the preparation of the denitrification catalyst, a new denitrification catalyst is obtained, which effectively improves the chemical stability of existing vanadium-based and cerium-based catalysts and can be used for stationary source denitrification.

[0004] Patent CN202110923407 improves the catalyst's arsenic resistance by using a high-vanadium, high-molybdenum formulation to increase surface active sites, enhance the catalyst's arsenic adsorption capacity, and add praseodymium oxide, which preferentially reacts with arsenic.

[0005] Patent CN202210088026.0 describes the pore structure of γ-Al2O3 through Si doping and the modification of transition metal catalysts to improve the arsenic resistance of the catalyst.

[0006] Patent CN202310595003.3 uses specific oxides to prevent arsenic precipitation and preferentially reacts with arsenic to form arsenic acid compounds, thereby improving the arsenic resistance of the catalyst.

[0007] Currently, there is limited research on denitrification catalysts resistant to arsenic poisoning. The patents mentioned above only improve the catalyst's arsenic-containing capacity to a limited extent, and cannot effectively inhibit the deposition of arsenic on the catalyst surface. Consequently, they cannot effectively solve the problem of long-term stable operation of denitrification catalysts in high-arsenic flue gas environments, and they do not consider the impact of SO2 / SO3 oxidation of modified catalysts on subsequent air preheaters.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] The purpose of this invention is to provide a denitrification catalyst resistant to high arsenic poisoning and its preparation method. This invention constructs a multi-component composite oxide denitrification catalyst prepared by target hybrid material through a self-assembly method, which suppresses the "capillary condensation" phenomenon formed by As2O3 in the catalyst channels and greatly reduces the deposition of arsenic on the catalyst surface.

[0010] In a first aspect, the present invention provides a denitrification catalyst for resisting high arsenic poisoning, comprising a support, an active component and a co-catalyst, wherein the mass ratio of the active component, the co-catalyst and the support is (2-10):(2-5):100;

[0011] The carrier is an oxide of titanium and silicon, the active component is an oxide of vanadium, iron, niobium and strontium, and the co-catalyst is an antimony oxide.

[0012] This invention uses oxides of vanadium, iron, niobium, and strontium as the active components of the catalyst. Iron oxides increase the adsorption sites for arsenic oxide, thereby enhancing the catalyst's adsorption capacity. Niobium and strontium oxides preferentially react with arsenic oxide, inhibiting arsenic poisoning of other components and maintaining catalyst activity. Simultaneously, this invention uses antimony oxide as a co-catalyst. Through the synergistic effect of antimony source with organic acids, organic amines, and nonionic surfactants, antimony is uniformly embedded and loaded within the mesoporous channels of the support. This synergistic effect with the oxides of vanadium, iron, niobium, and strontium further improves the catalyst's reduction and acid performance. Finally, this invention constructs the target hybrid material through a self-assembly method, followed by oxygen-enriched calcination to obtain a mesoporous denitrification catalyst resistant to high arsenic poisoning. The denitrification catalyst prepared by this method effectively inhibits the adsorption and accumulation of arsenic oxide in the catalyst channels, while maintaining good catalytic activity even with partial blockage of active channels.

[0013] In a preferred embodiment of this technical solution, the mass ratio of titanium dioxide to silicon dioxide in the carrier is preferably 100:(10-35).

[0014] The preferred mass ratio of vanadium, iron, niobium and strontium oxides in the active components is 10:(1-5):(0.5-2):(0.1-1).

[0015] Secondly, this invention also discloses a method for preparing the above-mentioned anti-arsenic poisoning denitrification catalyst, which should also fall within the scope of protection of this invention, specifically including the following steps:

[0016] S1. Dissolve organic acid, organic amine, surfactant and antimony trichloride in an organic solvent to prepare solution A;

[0017] S2. Dissolve vanadium source, iron source, niobium source and strontium source in acidic solution to prepare solution B;

[0018] S3. Dissolve the precursors of titanium and silicon in an organic solvent to prepare solution C;

[0019] S4. Slowly add solution B to solution C, let stand, and obtain sol D;

[0020] S5. Slowly add solution A to sol D, stir until homogeneous, and react in a reactor at 120-170℃ for 12-24 hours to obtain the target hybrid material;

[0021] S6. The target hybrid material is calcined in an oxygen-rich environment to obtain a denitrification catalyst resistant to high arsenic poisoning.

[0022] There is no restriction on the order of steps S1, S2 and S3.

[0023] This invention constructs the target hybrid material through self-assembly, and then obtains a mesoporous denitrification catalyst resistant to high arsenic poisoning through oxygen-enriched calcination. Compared with the method of sequentially synthesizing mesoporous silica by hydrothermal method, preparing composite support, and preparing SCR catalyst by impregnation method, this preparation method is simpler, easier to operate, and easier to promote industrially.

[0024] As a preferred embodiment of this technical solution, in step S1, the organic acid includes any one or both of polymethacrylic acid and polyacrylic acid;

[0025] The organic amine includes any one or more of hexamethyleneimine, dimethylformamide, diisopropanolamine, and polyethyleneimine;

[0026] The surfactant includes any one or more of nonionic polyethylene glycol-400, PEG-12 polydimethylsiloxane crosslinked polymer and F127;

[0027] The organic solvent includes anhydrous ethanol.

[0028] Antimony ions combine with organic acids through positive and negative ion interactions. Organic amines act as pH adjusters and template agents to control the electrostatic interactions between antimony ions, organic acids, and nonionic surfactants, forming a specific ordered structure with a multi-template framework. This allows antimony ions to be well dispersed and embedded in the mesoporous material framework, thereby regulating the dispersion and embedding of other metal ions. A high-temperature oxidation process then produces a uniform mesoporous structure, preparing a multi-component composite oxide denitration catalyst. Specifically, the preferred mass ratio of the organic acid, the organic amine, the surfactant, and the antimony trichloride is 1:(0.1-0.5):(0.8-1.5):(2-6).

[0029] As a preferred embodiment of this technical solution, in step S2, the vanadium source includes any one or more of vanadium oxysulfate, ammonium metavanadate, and vanadium oxyoxalate.

[0030] The iron source includes any one or more of ferric chloride, ferric nitrate, and ferric sulfate;

[0031] The niobium source includes any one or more of niobium pentachloride and niobium oxalate;

[0032] The strontium source includes any one or more of strontium chloride and strontium nitrate;

[0033] The acidic solution is any one or more of oxalic acid, citric acid, and aminosulfonic acid.

[0034] As a preferred embodiment of this technical solution, in step S3, the precursor of titanium includes any one or both of tetrabutyl titanate and isopropyl titanate; the precursor of silicon includes any one or more of tetraethyl silicate, tetrabutyl orthosilicate and methyl orthosilicate.

[0035] As a preferred embodiment of this technical solution, in step S4, the present invention does not strictly limit the conditions for standing. Specifically, during standing, the temperature can be controlled at 25-45℃ and the time at 2-5h.

[0036] As a preferred embodiment of this technical solution, in step S6, the calcination temperature is preferably 450-650℃, and the time can be selected as 2-8h.

[0037] The anti-arsenic poisoning denitrification catalyst and its preparation method of the present invention have at least the following beneficial effects:

[0038] 1. This invention constructs the target hybrid material through a self-assembly method, and then prepares a multi-component composite oxide denitration catalyst, which effectively inhibits the adsorption and enrichment of As2O3 in the catalyst channels and greatly reduces the deposition of arsenic on the catalyst surface.

[0039] 2. In this invention, iron oxide in the active component can increase the adsorption sites of As2O3 on the catalyst, and niobium and strontium oxide can preferentially react with arsenic oxide, thereby inhibiting the poisoning of other components by arsenic and maintaining the activity of the catalyst.

[0040] 3. The synergistic construction of antimony with organic acids, organic amines and nonionic surfactants in the co-catalyst of this invention enables antimony to be uniformly embedded or loaded in the mesoporous channels of the support. At the same time, under the synergistic effect of vanadium, iron, niobium and strontium composite oxides, the reduction performance and acid performance of the catalyst can be significantly improved, the adsorption of As2O3 and SO2 by the catalyst can be inhibited, and the catalyst can have excellent anti-arsenic poisoning performance, low SO2 oxidation rate and high N2 selectivity while maintaining high denitrification activity.

[0041] 4. Compared with the prior art, the present invention can deeply inhibit the poisoning of catalysts by arsenic and maintain excellent denitrification activity in high arsenic and high dust flue gas for a long time. It can be widely used in coal-fired power plants, metallurgical industry, etc. Detailed Implementation

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] The mass ratio of active component, cocatalyst and support is 7.5:4:100. Among them, the mass ratio of titanium dioxide to silicon dioxide in the support is 100:12; the mass ratio of vanadium, iron, niobium and strontium oxides in the active component is 10:1.5:1.5:0.3; and the mass ratio of organic acid, organic amine, surfactant and antimony trichloride in the cocatalyst preparation is 1:0.2:1.0:4.5.

[0047] S1. Dissolve a mixture of polyacrylic acid, dimethylformamide and diisopropanolamine (mass ratio 1:1), F127 and antimony trichloride in anhydrous ethanol to prepare solution A;

[0048] S2. Dissolve vanadium oxalate, ferric nitrate, niobium oxalate, and strontium nitrate in aminosulfonic acid solution to prepare solution B;

[0049] S3. Dissolve tetrabutyl titanate and tetrabutyl orthosilicate in anhydrous ethanol to prepare solution C;

[0050] S4. Slowly add solution B to solution C and let it stand at 32°C for 3.5 hours to obtain sol D;

[0051] S5. Slowly add solution A to sol D, stir evenly, transfer to a polytetrafluoroethylene reactor, and react at 133℃ for 18 hours to obtain the target hybrid material.

[0052] S6. The target hybrid material is calcined in oxygen-enriched conditions at 450-650℃ for 2-8 hours to obtain a mesoporous composite oxide denitration catalyst resistant to high arsenic poisoning.

[0053] Example 2

[0054] The mass ratio of active component, co-catalyst and support is 2:2:100, wherein the mass ratio of titanium dioxide and silicon dioxide is 100:10; in the active component, the mass ratio of vanadium, iron, niobium and strontium oxide is 10:1:0.5:0.1; in the co-catalyst, the mass ratio of organic acid, organic amine, surfactant and antimony trichloride is 1:0.1:0.8:2.

[0055] S1. Dissolve polymethacrylic acid, hexamethyleneimine, PEG-12 polydimethylsiloxane crosslinked polymer and antimony trichloride in anhydrous ethanol to prepare solution A;

[0056] S2. Dissolve vanadium sulfate, ferric chloride, niobium pentachloride, and strontium chloride in oxalic acid solution to prepare solution B;

[0057] S3. Dissolve tetrabutyl titanate and tetraethyl silicate in anhydrous ethanol to prepare solution C;

[0058] S4. Slowly add solution B to solution C and let it stand at 25°C for 4 hours to obtain sol D;

[0059] S5. Slowly add solution A to sol D, stir evenly, transfer to a polytetrafluoroethylene reactor, and react at 120°C for 12 hours to obtain the target hybrid material.

[0060] S6. The target hybrid material is calcined in oxygen-enriched conditions at 450-650℃ for 2-8 hours to obtain a mesoporous composite oxide denitration catalyst resistant to high arsenic poisoning.

[0061] Example 3

[0062] The mass ratio of active component, co-catalyst and support is 10:5:100. Among them, the mass ratio of titanium dioxide and silicon dioxide in the support is 100:35. The mass ratio of vanadium, iron, niobium and strontium oxides in the active component is 10:5:2:1. The mass ratio of organic acid, organic amine, surfactant and antimony trichloride in the co-catalyst is 1:0.5:1.5:6.

[0063] S1. Dissolve polyacrylic acid, dimethylformamide, polyethylene glycol-400 and antimony trichloride in anhydrous ethanol to prepare solution A;

[0064] S2. Dissolve ammonium metavanadate, ferric nitrate, niobium oxalate and strontium nitrate in aminosulfonic acid solution to prepare solution B;

[0065] S3. Dissolve isopropyl titanate and tetrabutyl orthosilicate in anhydrous ethanol to prepare solution C;

[0066] S4. Slowly add solution B to solution C and let it stand at 45°C for 2 hours to obtain sol D;

[0067] S5. Slowly add solution A to sol D, stir evenly, transfer to a polytetrafluoroethylene reactor, and react at 170℃ for 24 hours to obtain the target hybrid material.

[0068] S6. The target hybrid material is calcined in oxygen-enriched conditions at 450-650℃ for 2-8 hours to obtain a mesoporous composite oxide denitration catalyst resistant to high arsenic poisoning.

[0069] Example 4

[0070] The mass ratio of active component, co-catalyst and support is 5:3:100. Among them, the mass ratio of titanium dioxide and silicon dioxide in the support is 100:20. The mass ratio of vanadium, iron, niobium and strontium oxide in the active component is 10:5:1.2:0.8. The mass ratio of organic acid, organic amine, surfactant and antimony trichloride in the co-catalyst is 1:0.3:1.2:3.

[0071] S1. Dissolve a mixture of polyacrylic acid, dimethylformamide and diisopropanolamine (mass ratio 1:1), F127 and antimony trichloride in anhydrous ethanol to prepare solution A;

[0072] S2. Dissolve ammonium metavanadate, ferric sulfate, niobium oxalate, and strontium nitrate in citric acid solution to prepare solution B;

[0073] S3. Tetrabutyl titanate and methyl orthosilicate are dissolved in anhydrous ethanol to prepare solution C;

[0074] S4. Slowly add solution B to solution C and let it stand at 30°C for 3 hours to obtain sol D;

[0075] S5. Slowly add solution A to sol D, stir evenly, transfer to a polytetrafluoroethylene reactor, and react at 145℃ for 16 hours to obtain the target hybrid material.

[0076] S6. The target hybrid material is calcined in oxygen-enriched environment at 450-650℃ for 2-8 hours to obtain a mesoporous composite oxide denitration catalyst resistant to high arsenic poisoning.

[0077] Example 5

[0078] The mass ratio of active component, co-catalyst and support is 3:5:100. Among them, the mass ratio of titanium dioxide and silicon dioxide in the support is 100:30. The mass ratio of vanadium, iron, niobium and strontium oxide in the active component is 10:1.2:0.7:1.6. The mass ratio of organic acid, organic amine, surfactant and antimony trichloride in the co-catalyst is 1:0.3:1.1:5.

[0079] S1. Dissolve polymethacrylic acid, diisopropanolamine, polyethylene glycol-400, and antimony trichloride in anhydrous ethanol to prepare mixed solution A;

[0080] S2. Dissolve ammonium metavanadate, ferric sulfate, niobium pentachloride, and strontium nitrate in oxalic acid solution to prepare mixed solution B;

[0081] S3. Tetrabutyl titanate and methyl orthosilicate are dissolved in anhydrous ethanol to prepare a mixed solution C;

[0082] S4. Slowly add solution B to solution C and let it stand at 35°C for 3.5 hours to obtain sol D;

[0083] S5. Slowly add solution A to sol D, stir evenly, and then transfer it to a polytetrafluoroethylene reactor to react at 165°C for 13 hours to obtain the target hybrid material.

[0084] S6. The target hybrid material is calcined in oxygen-enriched environment at 450-650℃ for 2-8 hours to obtain a mesoporous composite oxide denitration catalyst resistant to high arsenic poisoning.

[0085] Compare with Example 1

[0086] Conventional arsenic poisoning-resistant denitrification catalyst, formulation 2V10Mo / TiO2;

[0087] Compare with Example 2

[0088] Mesoporous anatase carbon dioxide and mesoporous silica powder were selected as carriers.

[0089] The formula and preparation process are the same as in Example 1.

[0090] Compare with Example 3

[0091] No co-catalyst added;

[0092] The formula and preparation process are the same as in Example 1.

[0093] Compare with Example 4

[0094] In the active components, the mass ratio of vanadium, iron, niobium, and strontium oxides is 10:0.5:0.1:0.05;

[0095] The formula and preparation process are the same as in Example 1.

[0096] Compare with Example 5

[0097] In the active component, iron is replaced with cobalt;

[0098] The formula and preparation process are the same as in Example 1.

[0099] Compare with Example 6

[0100] In the co-catalyst, antimony is replaced with molybdenum;

[0101] The formula and preparation process are the same as in Example 1.

[0102] To investigate the activity of the denitrification catalysts prepared in the above embodiments and control examples, their denitrification efficiency was tested at flue gas temperatures of 280-500℃. The test results are shown in Table 1.

[0103] The test conditions are as follows:

[0104] The test temperature was 250-450℃, the NH3 volume concentration was 500ppm, the NH3 / NO ratio was 1, the SO2 volume concentration was 400ppm, the H2O volume concentration was 8%, and the GHSV was 120000h. -1 .

[0105] Table 1 Catalyst Denitrification Efficiency

[0106]

[0107]

[0108] As shown in Table 1, the arsenic poisoning-resistant denitrification catalyst prepared by the method of the present invention has high denitrification efficiency and excellent denitrification performance in the temperature range of 250-22500℃.

[0109] The present invention further investigated the denitrification activity (1% As2O3 loading), catalyst surface area and As2O3 deposition amount, SO2 / SO3 conversion rate and N2 selectivity of the denitrification catalysts prepared in the above embodiments and control examples at 350℃, SO2 / SO3 conversion rate and N2 selectivity. The test results are shown in Table 2.

[0110] The test conditions are as follows:

[0111] The denitrification catalyst is placed in a fixed-bed reactor. An arsenic-containing solution is injected into the preheater via a peristaltic pump, and after heating, it forms gaseous As2O3. A N2 / O2 mixture is used as a carrier gas to carry the gaseous As2O3 into the reactor and deposit it on the catalyst. By controlling parameters such as the concentration of the arsenic-containing solution, the flow rate of the peristaltic pump, and the temperature of the preheater, the loading of As2O3 on the catalyst is accurately achieved.

[0112] Test method: SO2 / SO3 oxidation rate was tested according to industry standard DL / T2279-2021 "Test method for sulfur dioxide oxidation rate of denitrification catalyst in flue gas of thermal power plant (powder method)".

[0113] Table 2 Performance of Denitrification Catalysts

[0114]

[0115]

[0116] In summary, the denitrification catalyst prepared by this invention still exhibits good denitrification activity (up to 88.3%) when the flue gas temperature is 350℃ and 1% As2O3 is loaded. The SO2 / SO3 conversion rate is only between 1.2%, the N2 selectivity is as high as 98.5%, and the As2O3 deposition on the catalyst surface is only 0.23% after 100 hours, demonstrating good resistance to arsenic poisoning and greatly reducing the deposition of As2O3 on the catalyst surface.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 denitrification catalyst resistant to high arsenic poisoning, characterized in that, It includes a support, an active component, and a co-catalyst, wherein the mass ratio of the active component, the co-catalyst, and the support is (2-10):(2-5):100; Wherein, the support is an oxide of titanium and silicon, the active component is an oxide of vanadium, iron, niobium and strontium, and the co-catalyst is an antimony oxide; The preparation method of the anti-arsenic poisoning denitrification catalyst includes the following steps: S1. Dissolve organic acid, organic amine, surfactant and antimony trichloride in an organic solvent to prepare solution A; S2. Dissolve vanadium source, iron source, niobium source and strontium source in acidic solution to prepare solution B; S3. Dissolve the precursors of titanium and silicon in an organic solvent to prepare solution C; S4. Slowly add solution B to solution C, let stand, and obtain sol D; S5. Slowly add solution A to sol D, stir until homogeneous, and react in a reactor at 120-170℃ for 12-24 hours to obtain the target hybrid material; S6. The target hybrid material is calcined in an oxygen-rich environment to obtain a denitrification catalyst resistant to high arsenic poisoning. There is no restriction on the order of steps S1, S2 and S3.

2. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In the carrier, the mass ratio of titanium dioxide to silicon dioxide is 100:(10-35).

3. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, The mass ratio of vanadium, iron, niobium and strontium oxides in the active components is 10:(1-5):(0.5-2):(0.1-1).

4. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S1, the organic acid includes any one or both of polymethacrylic acid and polyacrylic acid; The organic amine includes any one or more of hexamethyleneimine, dimethylformamide, diisopropanolamine, and polyethyleneimine; The surfactant includes any one or more of nonionic polyethylene glycol-400, PEG-12 polydimethylsiloxane crosslinked polymer and F127; The organic solvent includes anhydrous ethanol.

5. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S1, the mass ratio of the organic acid, the organic amine, the surfactant, and the antimony trichloride is 1:(0.1-0.5):(0.8-1.5):(2-6).

6. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S2, the vanadium source includes any one or more of vanadium oxysulfate, ammonium metavanadate, and vanadium oxyoxalate. The iron source includes any one or more of ferric chloride, ferric nitrate, and ferric sulfate; The niobium source includes any one or more of niobium pentachloride and niobium oxalate; The strontium source includes any one or more of strontium chloride and strontium nitrate; The acidic solution is any one or more of oxalic acid, citric acid, and aminosulfonic acid.

7. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S3, the titanium precursor includes any one or both of tetrabutyl titanate and isopropyl titanate. The silicon precursor includes any one or more of tetraethyl orthosilicate, butyl orthosilicate, and methyl orthosilicate.

8. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S4, during the settling period, the temperature is controlled at 25-45℃ and the time is 2-5 hours.

9. The anti-arsenic poisoning denitrification catalyst according to claim 1, characterized in that, In step S6, the calcination temperature is controlled at 450-650℃ and the time is 2-8h.

Images