CN110586073B

CN110586073B - A kind of catalyst used for catalytic oxidation to eliminate dioxin in kiln flue gas and preparation method thereof

Info

Publication number: CN110586073B
Application number: CN201911009509.1A
Authority: CN
Inventors: 唐志诚; 赵海军; 张国栋; 韩维亮; 董芳
Original assignee: Lanzhou Institute of Chemical Physics LICP of CAS
Current assignee: Lanzhou Institute of Chemical Physics LICP of CAS
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2022-03-25
Anticipated expiration: 2039-10-23
Also published as: CN110586073A

Abstract

本发明提供了一种用于垃圾焚烧炉、危险废弃物焚烧炉、医疗废物焚烧炉、钢铁烧结炉、燃煤电厂、殡仪馆和化工厂窑炉烟气和废气中二噁英类污染物催化氧化消除的催化剂及制备方法。该催化剂以工业钛白粉为载体，SnO₂‑V₂O₅‑WO₃复合氧化物为活性组分，La₂O₃、MoO₃、CeO₂、Nb₂O₅、CuO、Pr₆O₁₁和Sb₂O₃为助剂。本发明制备的催化剂中，活性组分在有机胺络合作用下均匀分散于载体表面，催化剂助剂在氨水条件下均匀沉淀于载体表面，使得催化剂比表面高，具有高的热稳定性和较强的抗氯中毒能力，可以连续长期运行而不需要活化，在二噁英类污染物消除中起活温度低，二噁英分解效率高。The invention provides a method for catalytic oxidation of dioxin pollutants in the kiln flue gas and waste gas of garbage incinerators, hazardous waste incinerators, medical waste incinerators, iron and steel sintering furnaces, coal-fired power plants, funeral homes and chemical plants. Eliminated catalyst and preparation method. The catalyst uses industrial titanium dioxide as the carrier, SnO ₂ ‑V ₂ O ₅ ‑WO ₃ composite oxide as the active component, La ₂ O ₃ , MoO ₃ , CeO ₂ , Nb ₂ O ₅ , CuO, Pr ₆ O ₁₁ and Sb ₂ O ₃ is an auxiliary agent. In the catalyst prepared by the invention, the active components are uniformly dispersed on the surface of the carrier under the complexation of organic amines, and the catalyst assistant is uniformly precipitated on the surface of the carrier under the condition of ammonia water, so that the catalyst has a high specific surface, high thermal stability and relatively high temperature stability. Strong anti-chlorine poisoning ability, can run continuously for a long time without activation, low activation temperature in the elimination of dioxin pollutants, and high dioxin decomposition efficiency.

Description

Catalyst for removing dioxin in kiln flue gas through catalytic oxidation and preparation method thereof

Technical Field

The invention relates to a catalyst for eliminating dioxin and a preparation method thereof, in particular to a catalyst for eliminating dioxin in kiln flue gas through catalytic oxidation and a preparation method thereof, and belongs to the field of catalysts and the field of environmental protection.

Background

Dioxin has the characteristics of stable chemical property, good thermal stability, difficult biodegradation and the like, can be accumulated in the environment for a long time, and causes serious harm to organisms and the environment. Dioxin is mainly derived from various human living and production activities, including household garbage incineration, hazardous waste and medical waste incineration, animal carcass incineration treatment, steel sintering (pelletizing) plants, non-ferrous metal smelting, paper pulp and paper making, chemical products, pesticide production and other industries.

Dioxin treatment techniques are numerous and include adsorption, condensation, membrane separation, direct combustion, plasma, photocatalytic, biological, and catalytic oxidation. Among them, the activated carbon adsorption technique in the adsorption method is currently widely used industrially due to its simple operation mode and low single investment cost. However, the activated carbon adsorption technology has the defects of high long-term operation cost and incomplete low-concentration dioxin treatment, so that the activated carbon adsorption technology is redundant and insufficient to the existing standard. In addition, the activated carbon adsorption only seals pollutants such as dioxin in the activated carbon pore canal, so that the dioxin is not really eliminated from the environment, and the activated carbon adsorbing the dioxin has the risk of secondary pollution.

Compared with the activated carbon adsorption technology, the method for eliminating dioxin through catalytic oxidation is to directly decompose and convert dioxin in flue gas into water, carbon dioxide and hydrogen chloride which are non-toxic or have small toxicity, and the method for eliminating dioxin through catalytic oxidation has the characteristics of high treatment efficiency, low later-stage operation cost, easiness in engineering and the like, and is the next generation dioxin elimination technology which is hopeful to replace activated carbon adsorption. The catalysts used for removing dioxin by the catalytic oxidation method mainly comprise three types of noble metal catalysts, molecular sieve catalysts and transition metal oxide catalysts (CN 101693198A, CN101733107 and CN 105107517). CN104226301 discloses a rare earth-based composite multi-component denitration and dioxin removal catalyst. CN102068905 discloses a catalyst for removing dioxin of VWTi honeycomb monomer by vanadium oxalate secondary impregnation, and the preparation of the catalyst needs secondary impregnation, secondary drying and roasting. In addition, CN106732544 reports a dioxin removal catalyst using montmorillonite and titanium dioxide as carriers. However, the dioxin removal catalysts reported in these patents are converted from selective catalytic reduction removal catalysts for nitrogen oxides, and when used for dioxin removal, there are problems that the decomposition temperature of dioxin is high or the emission content of dioxin after treatment does not reach the national standard. In other patents, noble metals or other substances are used as or sexual components, the preparation cost of the catalyst is high, or the reported preparation method of the catalyst is complicated, so that the industrial production and application cannot be really carried out.

Disclosure of Invention

The invention aims to provide a catalyst for removing dioxin pollutants through catalytic oxidation, which has high low-temperature activity and good stability and is easy to industrially produce, and a preparation method thereof, aiming at solving the problems that the existing catalyst for removing dioxin pollutants has high decomposition temperature and low decomposition efficiency and is difficult to industrially produce.

The catalyst for eliminating dioxin in kiln flue gas by catalytic oxidation comprises a catalyst carrier, an active component and an auxiliary agent, wherein the catalyst carrier is industrial titanium dioxide and accounts for 74-91% of the total mass of the catalyst; the active component of the catalyst is SnO₂-V₂O₅-WO₃The composite oxide accounts for 5.5-23% of the total mass of the catalyst; the catalyst auxiliary agent is La₂O₃、MoO₃、CeO₂、Nb₂O₅、CuO、Pr₆O₁₁And Sb₂O₃At least one of them, and accounts for 0.1-3.0% of the total mass of the catalyst.

The active component SnO of the catalyst₂-V₂O₅-WO₃In the composite oxide, SnO₂Accounts for 0.5-4.0% of the total mass of the catalyst, and V₂O₅2.0-9.0% of the total mass of the catalyst, and WO₃Accounting for 3.0-10.0% of the total mass of the catalyst.

The preparation method of the catalyst for eliminating dioxin in kiln flue gas by catalytic oxidation comprises the following steps:

(1) completely dissolving precursors of active components of tin, vanadium and tungsten of the catalyst in a deionized water-organic amine mixed solution under vigorous stirring, and marking the solution as A solution; the tin precursor is stannous chloride or stannic chloride, and the vanadium precursor is ammonium metavanadate, vanadyl oxalate or vanadyl sulfate; the tungsten precursor is ammonium metatungstate or ammonium paratungstate. The mass of the deionized water is 5.0-15.0 times of that of the precursors of tin, vanadium and tungsten; the organic amine is one or more of monoethanolamine, diethanolamine, triethanolamine or formamide, and the mass of the organic amine is 0.5-4.5 times that of the precursors of tin, vanadium and tungsten;

(2) adding the catalyst carrier industrial titanium dioxide into the solution A, stirring the mixture fully and uniformly, and marking the mixture as a solution B;

(3) the catalyst promoter was dissolved in deionized water and labeled as solution C. The using amount of the deionized water is 1.0-8.0 times of the total mass of the precursors of the tin, the vanadium and the tungsten;

(4) and slowly adding the solution C and ammonia water into the solution B under vigorous stirring to uniformly mix, and marking as a solution D. Wherein the adding amount of ammonia water is 0.1-3.0 times of the total mass of the precursors of tin, vanadium and tungsten;

(5) heating the solution D in a water bath to 30-60 ℃, and stirring for 2-8 hours to form paste; and drying the paste, and then calcining the paste in a muffle furnace at high temperature to obtain the catalyst. Drying is carried out in a forced air drying oven at the temperature of 80-100 ℃ for 12-24 hours; the calcination is carried out at 300-600 ℃ for 3-10 hours.

Compared with the prior art, the invention has the following advantages:

1. in the catalyst prepared by the invention, the active component is uniformly dispersed on the surface of the carrier under the complexing action of organic amine, and the catalyst auxiliary agent is uniformly precipitated on the surface of the carrier under the condition of ammonia water, so that the catalyst has high specific surface, high thermal stability and strong chlorine poisoning resistance, and can continuously run for a long time without activation;

2. the catalyst has low activation temperature and high decomposition efficiency of dioxin during the elimination of dioxin pollutants, can treat dioxin with different concentrations, and has the dioxin content in a flue gas outlet lower than 0.1 ng TEQ/Nm³；

3. The catalyst is easy to form and can be prepared into honeycomb, granular and clover forms according to the use requirement;

4. the catalyst does not contain noble metal, and the raw materials are cheap and easy to obtain; the preparation method is simple, has lower cost and is easy to implement in industrial production;

5. the catalyst of the invention can be used for the catalytic oxidation elimination of dioxin pollutants and the removal of other chlorine-containing volatile organic pollutants in flue gas, so that the content of dioxin pollutants at the outlet of the flue gas or waste gas is lower than the national emission standard when the catalyst is used for the treatment of the flue gas or waste gas.

Drawings

FIG. 1 is a graph showing catalytic oxidation elimination activity of dioxin analog o-dichlorobenzene on the catalysts of examples 1 to 3.

FIG. 2 is a graph showing the catalytic oxidation elimination activity of the dioxin analog o-dichlorobenzene on the catalysts of examples 4 to 7.

FIG. 3 is a graph showing the catalytic oxidation elimination activity of the dioxin analog o-dichlorobenzene on the catalysts of examples 8 to 10.

Detailed Description

The composition and preparation of the catalyst of the invention are further illustrated by the following specific examples.

Example 1

(1) Fully dissolving 0.64g of ammonium metavanadate, 0.54 g of ammonium metatungstate and 0.35 g of stannic chloride in a mixed solution of 10 g of deionized water and 3 g of monoethanolamine, and marking as a solution A;

(2) adding 8.75 g of titanium dioxide into the solution A, and fully and uniformly dispersing to obtain a solution B;

(3) adding 0.12 g of ammonium molybdate into 3 g of deionized water, and stirring to fully dissolve the ammonium molybdate to obtain a solution C;

(4) slowly adding the solution C and 0.5 g of ammonia water into the solution B at the same time under vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 5 hours under the condition of water bath at the temperature of 40 ℃; after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 100 ℃ for 12 hours;

(6) calcining the dried blocks in a muffle furnace at 400 ℃, at the heating rate of 2 ℃/min and for 5 hours to obtain the catalyst; the catalyst was tableted and sieved to form 40-60 mesh catalyst particles, designated catalyst 1. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 1.

Example 2

(1) Fully dissolving 1.15 g of ammonium metavanadate, 0.54 g of ammonium metatungstate and 0.08 g of stannous chloride in a mixed solution of 15 g of deionized water and 2 g of monoethanolamine, and marking as a solution A;

(2) adding 8.5 g of titanium dioxide into the solution A, and fully and uniformly dispersing to obtain a solution marked as solution A;

(3) adding 0.13 g of cerium nitrate into 3 g of deionized water, and stirring to fully dissolve the cerium nitrate to obtain a solution C;

(4) slowly adding the solution C and 1.0 g of ammonia water into the solution B at the same time under vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 4 hours under the condition of water bath at 50 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 80 ℃ for 20 hours;

(6) calcining the dried blocks in a muffle furnace at 500 ℃, at the heating rate of 2 ℃/min for 3 hours to obtain a catalyst; the catalyst was tableted and sieved to form 40-60 mesh catalyst particles, designated catalyst 2. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 1.

Example 3

(1) Fully dissolving 1.02 g of ammonium metavanadate, 0.37 g of ammonium paratungstate and 0.23 g of stannic chloride in a mixed solution of 20 g of deionized water and 1 g of monoethanolamine, and marking as a solution A;

(2) adding 8.7 g of titanium dioxide into the solution A, and stirring to fully dissolve the titanium dioxide to obtain a solution B;

(3) adding 0.26 g of lanthanum nitrate into 5g of deionized water, and stirring to fully dissolve the lanthanum nitrate to obtain a solution C;

(4) slowly adding the solution C and 1.5 g of ammonia water into the solution B at the same time under vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 7 hours under the condition of water bath at the temperature of 30 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 80 ℃ for 15 hours;

(6) placing the dried blocks in a muffle furnace for calcining at 600 ℃, wherein the heating rate is 2 ℃/min, and the calcining time is 7 hours to obtain a catalyst; the catalyst was tableted and sieved to form catalyst particles of 40-60 mesh size and designated catalyst 3. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 1.

Example 4

(1) Fully dissolving 0.80 g of vanadyl oxalate, 0.97 g of ammonium metatungstate and 0.47 g of stannic chloride in a mixed solution of 25 g of deionized water and 1.5 g of diethanolamine, and marking as a solution A;

(2) adding 8.5 g of titanium dioxide into the solution A, and fully and uniformly dispersing to obtain a solution B;

(3) adding 0.30 g of copper nitrate into 3 g of deionized water, and stirring to fully dissolve the copper nitrate to obtain a solution C;

(4) slowly adding the solution C and 2.0 g of ammonia water into the solution B at the same time under vigorous stirring, and marking as a solution D;

(5) continuously stirring the solution D for 5 hours under the condition of water bath at 40 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 100 ℃ for 12 hours;

(6) and (3) calcining the dried blocks in a muffle furnace at 400 ℃, at the heating rate of 2 ℃/min for 5 hours to obtain a catalyst, tabletting and sieving the catalyst to form 40-60-mesh catalyst particles, and marking as catalyst 4. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 2.

Example 5

(1) Fully dissolving 0.90 g of ammonium metavanadate, 0.54 g of ammonium metatungstate and 0.12 g of stannic chloride in a mixed solution of 15 g of deionized water and 6 g of monoethanolamine, and marking as a solution A;

(2) adding 8.7 g of titanium dioxide into the solution A, fully and uniformly dispersing, and marking as a solution B;

(3) adding 0.13 g of praseodymium nitrate into 5g of deionized water, and stirring to fully dissolve the praseodymium nitrate to obtain a solution C;

(4) slowly adding the solution C and 4.6 g of ammonia water into the solution B at the same time under the condition of vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 3 hours under the condition of water bath at 50 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 100 ℃ for 12 hours;

(6) and (3) calcining the dried blocks in a muffle furnace at 400 ℃, at the heating rate of 2 ℃/min for 3 hours to obtain a catalyst, tabletting and sieving the catalyst to form catalyst particles of 40-60 meshes, and marking as catalyst 5. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 2.

Example 6

(1) Dissolving 1.39 g of vanadyl sulfate, 0.86 g of ammonium metatungstate and 0.45 g of stannous chloride in a mixed solution of 10 g of deionized water and 8 g of monoethanolamine, and marking as solution A;

(2) adding 8.35 g of titanium dioxide into the solution A, fully and uniformly dispersing, and marking as a solution B;

(3) adding 0.2 g of niobium oxalate into 7 g of deionized water, and stirring to fully dissolve the niobium oxalate to obtain a solution C;

(4) slowly adding the solution C and 4.0 g of ammonia water into the solution B at the same time under vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 8 hours under the condition of water bath at 40 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 90 ℃ for 15 hours;

(6) and (3) placing the dried blocks into a muffle furnace for calcining at 500 ℃, at the heating rate of 2 ℃/min for 7 hours to obtain a catalyst, tabletting and sieving the catalyst to form catalyst particles of 40-60 meshes, and marking as a catalyst 6. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 2.

Example 7

(1) Fully dissolving 0.64g of ammonium metavanadate, 0.62 g of ammonium paratungstate and 0.93 g of stannic chloride in a mixed solution of 15 g of deionized water and 8 g of triethanolamine, and marking as a solution A;

(2) adding 8.55g of titanium dioxide into the solution A, and fully and uniformly dispersing to obtain a solution B;

(3) adding 0.106 g of antimony acetate into 15 g of deionized water, stirring to fully dissolve the antimony acetate, and marking as a solution C;

(4) slowly adding the solution C and 3.5 g of ammonia water into the solution B at the same time under violent stirring to obtain a solution D;

(5) continuously stirring the solution D for 5 hours under the condition of water bath at 60 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 80 ℃ for 24 hours;

(6) and calcining the dried block in a muffle furnace at 600 ℃, at the heating rate of 2 ℃/min for 3 hours to obtain a catalyst, tabletting and sieving the catalyst to form 40-60-mesh catalyst particles, and marking as catalyst 7. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 2.

Example 8

(1) Fully dissolving 0.51 g of ammonium metavanadate, 0.54 g of ammonium metatungstate and 0.47 g of stannic chloride in a mixed solution of 21 g of deionized water and 6 g of formamide, and marking as a solution A;

(2) adding 8.8 g of titanium dioxide into the solution A, and fully and uniformly dispersing to obtain a solution B;

(3) adding 0.13 g of cerium nitrate and 0.2 g of niobium oxalate into 6.0 g of deionized water, stirring and fully dissolving to obtain a solution C;

(4) slowly adding the solution C and 3 g of ammonia water into the solution B at the same time under violent stirring to obtain a solution D;

(5) continuously stirring the solution D for 5 hours under the condition of water bath at the temperature of 60 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 80 ℃ for 20 hours;

(6) and calcining the dried block in a muffle furnace at 500 ℃, at the heating rate of 2 ℃/min for 8 hours to obtain a catalyst, tabletting and sieving the catalyst to form catalyst particles of 40-60 meshes, and marking as the catalyst 8. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 3.

Example 9

(1) Fully dissolving 2.15 g of vanadyl oxalate, 0.97 g of ammonium metatungstate and 0.82 g of stannic chloride in a mixed solution of 30 g of deionized water and 10 g of monoethanolamine, and marking as a solution A;

(2) adding 7.8 g of titanium dioxide into the solution A, fully and uniformly dispersing, and marking as a solution B;

(3) adding 0.13 g of cerium nitrate and 0.27 g of lanthanum nitrate into 4.0 g of deionized water, and stirring to fully dissolve the cerium nitrate and the lanthanum nitrate to obtain a solution C;

(4) slowly adding the solution B and 0.8 g of ammonia water into the solution C at the same time under vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 7 hours under the condition of water bath at 50 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 80 ℃ for 24 hours;

(6) and (3) calcining the dried blocks in a muffle furnace at 400 ℃, at the heating rate of 2 ℃/min for 8 hours to obtain a catalyst, tabletting and sieving the catalyst to form catalyst particles of 40-60 meshes, and marking as catalyst 9. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 3.

Example 10

(1) Fully dissolving 0.25 g of ammonium metavanadate, 0.43 g of ammonium metatungstate and 0.23 g of stannic chloride in a mixed solution of 9 g of deionized water and 4g of monoethanolamine, and marking as a solution A;

(2) adding 9.1 g of titanium dioxide into the solution A, fully and uniformly dispersing, and marking as a solution B;

(3) adding 0.4 g of niobium oxalate and 0.21 g of antimony acetate into 7 g of deionized water, and stirring to fully dissolve the niobium oxalate and the antimony acetate to obtain a solution C;

(4) slowly adding the solution C and 0.6 g of ammonia water into the solution B at the same time under the condition of vigorous stirring to obtain a solution D;

(5) continuously stirring the solution D for 8 hours under the condition of water bath at 60 ℃, after the water in the mixed solution is evaporated and dried to form a pasty mixture, further drying the mixture in a forced air drying oven at the drying temperature of 90 ℃ for 15 hours;

(6) and calcining the dried block in a muffle furnace at 600 ℃, at the heating rate of 2 ℃/min for 7 hours to obtain a catalyst, tabletting and sieving the catalyst to form catalyst particles of 40-60 meshes, and marking as the catalyst 10. The performance test of the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene is carried out in a fixed bed, and the test result of the catalyst performance is shown in figure 3.

From the above examples, it can be seen that the catalyst prepared by the catalyst composition and the preparation method of the present invention has better reaction activity in the catalytic oxidation elimination of the dioxin analogue o-dichlorobenzene. Under the conditions of high ortho-dichlorobenzene concentration (1000 ppm) and space velocity of 15000 ml/(h.g), the elimination rate of ortho-dichlorobenzene can reach 98% when the temperature of the catalyst prepared in examples 1-3 is 210 ℃; when the space velocity is 25000 ml/(h.g), and the temperature of the catalyst prepared in examples 4-7 is 220 ℃, the elimination rate of o-dichlorobenzene can reach 99 percent; when the space velocity is 35000 ml/(h.g), and the temperature of the catalyst prepared in examples 8-10 is 230 ℃, the elimination rate of ortho-dichlorobenzene can reach 98%. Therefore, when the catalyst is applied to the catalytic oxidation elimination of dioxin analogue o-dichlorobenzene, the removal efficiency is equivalent to or better than that of the existing catalyst.

Claims

1. A preparation method of a catalyst for removing dioxin in kiln flue gas through catalytic oxidation comprises the following steps:

(1) completely dissolving precursors of active components of tin, vanadium and tungsten of the catalyst in a deionized water-organic amine mixed solution under vigorous stirring, and marking the solution as A solution;

(3) dissolving one or more of lanthanum nitrate, ammonium molybdate, cerium nitrate, niobium oxalate, copper nitrate, praseodymium nitrate or antimony acetate catalyst promoter precursors into deionized water, and marking the solution as a solution C;

(4) slowly adding the solution C and ammonia water into the solution B under vigorous stirring to uniformly mix, and marking as a solution D;

(5) heating the solution D in a water bath to 30-60 ℃, and stirring for 2-8 hours to form paste; drying the paste, and then calcining at high temperature in a muffle furnace to obtain a catalyst;

the obtained catalyst consists of a catalyst carrier, an active component and an auxiliary agent, wherein the catalyst carrier is industrial titanium dioxide and accounts for 74-91% of the total mass of the catalyst; the active component of the catalyst is SnO₂-V₂O₅-WO₃The composite oxide accounts for 5.5-23% of the total mass of the catalyst; the catalyst auxiliary agent is La₂O₃、MoO₃、CeO₂、Nb₂O₅、CuO、Pr₆O₁₁And Sb₂O₃At least one of the components (a) and (b) accounts for 0.1-3.0% of the total mass of the catalyst; SnO as active component of catalyst₂-V₂O₅-WO₃In the composite oxide, SnO₂Accounts for 0.5-4.0% of the total mass of the catalyst, and V₂O₅2.0-9.0% of the total mass of the catalyst, and WO₃Accounting for 3.0-10.0% of the total mass of the catalyst.

2. The preparation method of the catalyst for catalytic oxidation elimination of dioxin in kiln flue gas according to claim 1, characterized by comprising the following steps: the tin precursor is stannous chloride or stannic chloride; the vanadium precursor is ammonium metavanadate, vanadyl oxalate or vanadyl sulfate; the tungsten precursor is ammonium metatungstate or ammonium paratungstate.

3. The preparation method of the catalyst for catalytic oxidation elimination of dioxin in kiln flue gas according to claim 1, characterized by comprising the following steps: in the step (1), the organic amine is one or more of monoethanolamine, diethanolamine, triethanolamine or formamide.

4. The preparation method of the catalyst for catalytic oxidation elimination of dioxin in kiln flue gas according to claim 1, characterized by comprising the following steps: in the step (1), the mass of the deionized water is 5.0-15.0 times of that of the precursors of tin, vanadium and tungsten; the mass of the organic amine is 0.5-4.5 times of that of the precursors of tin, vanadium and tungsten.

5. The preparation method of the catalyst for catalytic oxidation elimination of dioxin in kiln flue gas according to claim 1, characterized by comprising the following steps: in the step (3), the amount of the deionized water is 1.0-8.0 times of the total mass of the precursors of tin, vanadium and tungsten.

6. The preparation method of the catalyst for eliminating dioxin in kiln gas by catalytic oxidation according to claim 1, characterized by comprising the following steps: in the step (4), the adding amount of ammonia water is 0.1-3.0 times of the total mass of the precursors of tin, vanadium and tungsten.

7. The preparation method of the catalyst for eliminating dioxin in kiln gas by catalytic oxidation according to claim 1, characterized by comprising the following steps: in the step (5), the drying is carried out in a forced air drying oven at the temperature of 80-100 ℃ for 12-24 hours.

8. The preparation method of the catalyst for eliminating dioxin in kiln gas by catalytic oxidation according to claim 1, characterized by comprising the following steps: in the step (5), the calcination is carried out at 300-600 ℃ for 3-10 hours.