A denitration catalyst with K gain and resistance to water and sulfur combined poisoning and a preparation method and application thereof

Abstract

The present application relates to a kind of K gain with anti-water, sulfur complex poisoning denitration catalyst with preparation method and application, belong to environmental protection catalytic material and air pollution control field.The organic solvent is as template agent, with cerium oxide, manganese oxide, tungsten oxide, titanium oxide as active component, and the porous structure, strong acidity cerium manganese tungsten titanium composite oxide active component is prepared by evaporation induced self-assembly method.The catalyst component is environmentally friendly, low cost, simple preparation method, especially suitable for the stable, efficient purification of NO x In complex flue gas of cement industry.

Description

Technical Field

[0001] This invention relates to an SCR denitrification catalyst with K gain at medium and low temperatures and resistance to water and sulfur poisoning, as well as its preparation method and application, belonging to the fields of environmental catalytic materials and air pollution control. Technical Background

[0002] Nitrogen oxides (NO) x NOx is a major pollutant released by human activities. Large-scale emissions can cause smog, acid rain, ozone depletion, and photochemical smog, posing serious harm to the environment and human health. x The control of emissions has been extensively studied. Selective catalytic reduction (SCR) denitrification technology has the advantages of high denitrification efficiency, mature technology and no harmful products, and is the most widely used denitrification technology.

[0003] In practical applications, alkali metals (e.g., K, Na, Ca, Mg) in the flue gas from kilns in various process stages of the cement industry can poison SCR catalysts, leading to catalyst deactivation and deterioration of the SCR purification system. Alkali metal deactivation of SCR catalysts mainly includes physical and chemical deactivation. Physical deactivation is primarily manifested as the deposition of alkali metals (e.g., K, Ca, Mg), which blocks catalyst pores, resulting in a reduction in the catalyst's specific surface area and pore volume. Chemical poisoning mainly affects the catalyst's redox performance and surface acidity, thereby impacting NH3 adsorption and reducing denitrification performance. For vanadium-based and manganese-based catalysts, alkali metals can destroy their Brønsted acid sites, inhibiting NH3 adsorption on the catalyst and reducing oxygen surface adsorption, thus inhibiting the denitrification activity of the SCR catalyst. For copper-based catalysts, isolated Cu... 2+ It is often the main active component of copper-based catalysts. However, the presence of alkali metals can lead to the free state of Cu. 2+ The conversion to other copper species reduces the active components of the catalyst, thereby decreasing its activity. For cerium-based catalysts, the chemically adsorbed oxygen content and Ce... 3+ / (Ce 3+ +Ce 4+The decrease in the ratio of NH3 to nitrogen and the amount of NH3 adsorption are the main reasons for catalyst poisoning and deactivation. For iron-based catalysts, the destruction of Brønsted acid sites and the inhibition of oxygen adsorption capacity by alkali metals are the main causes of catalyst poisoning. In general, alkali metals reduce the acidity and reducibility of the catalyst surface by occupying active sites, thereby reducing the denitrification activity. Among the related technologies of alkali-resistant denitrification catalysts reported at home and abroad, (CN118719048A) prepared a niobium-modified sulfur- and alkali-resistant low-temperature denitrification catalyst by impregnation after preparing manganese-titanium metal oxides by sol-gel method. Its denitrification activity is higher than 80% at 100-300℃, but the activity drops rapidly after alkali poisoning. (CN116637614B) prepared a denitrification catalyst with cerium-manganese composite oxide as active component and silica as support. Its denitrification activity is higher than 80% at 225-350℃, but the activity decreases after loading Na by impregnation method, with the denitrification activity decreasing by more than 10% across the entire temperature range. A γ-Fe2O3 / HZSM-5 denitration catalyst with high low-temperature catalytic activity was prepared (CN114433195B). Its denitration activity was above 80% at 300-400℃, but decreased after Na loading. Furthermore, under actual operating conditions, the presence of H2O and SO2 can poison the catalyst, thus reducing its denitration performance.

[0004] Research on SCR denitrification catalysts aims not only to improve the catalyst's individual resistance to alkali metals, water, and sulfur poisoning, but also to significantly enhance its resistance to complex poisoning under conditions where alkali metals, water, and sulfur coexist. Therefore, developing a highly efficient denitrification catalyst with excellent resistance to sulfur, water, and alkali metal complex poisoning under actual operating conditions is of great significance. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of poor stability of denitrification catalysts in the cement industry against complex poisoning, and to provide a highly efficient denitrification catalyst that can achieve K gain at medium and low temperatures while also being resistant to water and sulfur. Another purpose of this invention is to provide a method for preparing the above-mentioned denitrification catalyst.

[0006] A denitrification catalyst with K-gain and resistance to water and sulfur poisoning is proposed. The catalyst uses F127 as a template agent, potassium nitrate as an alkali metal precursor, and cerium oxide, manganese oxide, tungsten oxide, and titanium oxide as denitrification active components.

[0007] In the above catalyst, the molar ratio of Ce, Mn, W, and Ti is 1:(0.02~0.8):(0.02~0.30):(0.1~0.6). Preferably, the molar ratio of Ce, Mn, W, and Ti is 1:(0.2~0.6):(0.1~0.30):(0.1~0.6).

[0008] A method for preparing the above-mentioned catalyst, comprising the following specific steps:

[0009] (1) Preparation of template agent

[0010] Add F127 to distilled water and stir in an oil bath until completely dissolved to obtain solution A;

[0011] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0012] Add the cerium manganese tungsten titanium oxide precursor to solution A and stir until homogeneous; then dry the sample in an oven and finally calcine it to obtain the cerium manganese tungsten titanium composite oxide catalyst.

[0013] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0014] The alkali metal precursor was added to distilled water and stirred until completely dissolved. Then, the cerium manganese tungsten titanium catalyst was added to the solution and stirred continuously. The sample was then dried in an oven and finally transferred to a muffle furnace for calcination.

[0015] In the above preparation method, the oil bath temperature in step (1) is 30-50℃.

[0016] In the above preparation method, the cerium manganese tungsten titanium oxide precursor in step (2) is cerium nitrate, manganese nitrate, ammonium metatungstate and tetrabutyl titanate.

[0017] In the above preparation method, the mass ratio between the cerium manganese tungsten titanium oxide precursor and F127 in step (2) is 12-17:1-6.

[0018] In the above preparation method, the sample drying temperature in step (2) is 80-100℃ and the drying time is 36-60h; the calcination temperature is 400-700℃ and the calcination time is 1-5h. The calcination is a programmed temperature rise with a heating rate of 3-8℃ / min.

[0019] In the above preparation method, the alkali metal precursor in step (3) is potassium nitrate; the mass ratio of the cerium manganese tungsten titanium composite oxide catalyst to the alkali metal precursor is 100:0.5~3.

[0020] In the above preparation method, the drying temperature in step (3) is 70-110℃ and the drying time is 10-24h; the calcination temperature is 400-700℃ and the calcination time is 1-5h. The calcination adopts a programmed temperature rise with a heating rate of 3-8℃ / min.

[0021] The application of the catalyst in denitrification in the technical solution of this invention.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The catalyst of this invention exhibits excellent denitrification activity and resistance to complex poisoning under conditions of 100–325℃ and the coexistence of alkali metals, water, and sulfur. The CMWT catalyst achieves a denitrification efficiency >80% at 150–325℃, while the CMWT-K catalyst, after loading 1 wt.% K, achieves a denitrification efficiency >80% at 100–325℃ and >90% at 100–300℃. This indicates that the CMWT catalyst prepared by the evaporation-induced self-assembly method shows an increase in activity at low and medium temperatures after K poisoning, suggesting that K has a certain beneficial effect on the catalyst. This is mainly due to the dynamic regulation of the valence state and surface chemical state of the active components by K. + Electrons are donated to Ce, Mn, and Ti, inducing partial reduction of the metals (Ce). 4+ →Ce 3+ Mn 4+ →Mn 3+ Ti 4+ →Ti 3+ Simultaneously, oxygen vacancies are generated, which act as active sites to adsorb and activate NO, lowering the low-temperature reaction energy barrier and enhancing low-temperature redox activity. Furthermore, under conditions of 200℃, 1wt.% K, 5% H2O, and 300ppm SO2, the activity remains above 90% for 12 hours.

[0024] (2) This invention utilizes organic solvents as template agents to introduce porous structures, accelerate ABS decomposition, and improve resistance to water and sulfur. At the same time, the doping of titanium dioxide causes the carboxyl groups to lose protons, thereby providing more Brønsted acid sites, increasing the acidity on the catalyst surface, and thus improving the catalyst's resistance to alkali metal, water, and sulfur poisoning. With a loading of 1 wt.% K, the catalyst achieves a denitrification efficiency of >90% at 200℃, 5 vol.% H2O, and 300 ppm SO2, and its denitrification efficiency stabilizes above 90% after 12 hours.

[0025] (3) The preparation method of the present invention is simple, low cost, low requirements for synthesis equipment, and has the advantages of resisting water and sulfur poisoning in the presence of K at medium and low temperature. It is suitable for flue gas denitrification containing alkali / alkaline earth metal fly ash and SO2, such as waste incinerators, cement kilns, biomass fuel boilers and glass kilns, and can greatly extend the service life of the catalyst in flue gas denitrification. Attached Figure Description

[0026] Figure 1 This invention provides an example of an NH3-SCR method for removing NO at 200°C that is resistant to water, sulfur, and combined poisoning by alkali, water, and sulfur, as well as Comparative Example 1. x Stability plot. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited thereto.

[0028] The method for evaluating the denitrification performance of the catalyst of this invention is as follows: Simulating the composition of exhaust gas, the inlet NO concentration is 1000 ppm, the inlet NH3 concentration is 1000 ppm, the O2 content is 10%, the SO2 concentration is 300 ppm (added during use), the H2O content is 5 vol.% (added during use), and N2 is used as the carrier gas. The catalyst dosage is set to 1.2 ml, and the reaction space velocity (GHSV) is set to 30000 h⁻¹. -1 The reaction temperature range was set to 50–400℃, and NO was monitored online before and after the reaction using a flue gas analyzer. x The concentration change.

[0029] Example 1

[0030] (1) Preparation of template agent

[0031] Add 3g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0032] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0033] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.4, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 2.72 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, which was named M-CMWT-1.

[0034] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0035] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-1.

[0036] (4) Catalyst denitrification performance test

[0037] The fresh catalyst exhibits a denitrification efficiency >90% at 175–275℃. With a K loading of 1 wt.% K, the denitrification efficiency is also >90% at 125–275℃. This indicates that the catalyst with a K loading exhibits a gain effect at low temperatures.

[0038] Example 2

[0039] (1) Preparation of template agent

[0040] Add 4g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0041] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0042] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.4, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 2.72 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, named M-CMWT-2.

[0043] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0044] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-2.

[0045] (4) Catalyst denitrification performance test

[0046] The fresh catalyst exhibits a denitrification efficiency >90% at 175–300℃. With a K loading of 1 wt.% K, the denitrification efficiency also exceeds 90% at 100–300℃, indicating that the 1 wt.% K-loaded catalyst shows a gain effect at low temperatures. The cerium-manganese-tungsten-titanium composite oxide catalyst with a K loading achieves 100% denitrification efficiency at 200℃, 5 vol.% H₂O, and 300 ppm SO₂, and its denitrification efficiency stabilizes above 100% after 12 hours.

[0047] Example 3

[0048] (1) Preparation of template agent

[0049] Add 5g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0050] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0051] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.4, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 2.72 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, which was named M-CMWT-3.

[0052] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0053] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-3.

[0054] (4) Catalyst denitrification performance test

[0055] The fresh catalyst exhibits a denitrification efficiency >90% at 175–275℃. With a K loading of 1 wt.% K, the denitrification efficiency is also >90% at 125–275℃. This indicates that the catalyst with a K loading exhibits a gain effect at low temperatures.

[0056] Example 4

[0057] (1) Preparation of template agent

[0058] Add 4g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0059] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0060] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.2, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 1.36 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, named M-CMWT-4.

[0061] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0062] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-4.

[0063] (4) Catalyst denitrification performance test

[0064] The fresh catalyst exhibits a denitrification efficiency >90% at 150–275℃. With a K loading of 1 wt.% K, the denitrification efficiency is also >90% at 125–275℃. This indicates that the catalyst with a K loading exhibits a gain phenomenon at low temperatures.

[0065] Example 5

[0066] (1) Preparation of template agent

[0067] Add 4g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0068] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0069] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.3, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 2.04 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, which was named M-CMWT-5.

[0070] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0071] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-5.

[0072] (4) Catalyst denitrification performance test

[0073] The fresh catalyst exhibits a denitrification efficiency >90% at 200–300℃. With a K loading of 1 wt.% K, the denitrification efficiency is also >90% at 150–300℃. This indicates that the catalyst with a K loading exhibits a gain phenomenon at low temperatures.

[0074] Example 6

[0075] (1) Preparation of template agent

[0076] Add 4g of F127 to 100ml of distilled water, stir in an oil bath at 40℃ until completely dissolved, and obtain a clear solution A;

[0077] (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0078] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.5, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 3.4 g of tetrabutyl titanate were weighed and added to solution A, and stirred evenly. Then, the above sample was placed in an oven at 90°C and dried for 48 h. After drying, it was placed in a muffle furnace and heated to 600°C at 5°C / min for 3 h to obtain the catalyst, which was named M-CMWT-6.

[0079] (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0080] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. After drying, the sample was placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst KM-CMWT-6.

[0081] (4) Catalyst denitrification performance test

[0082] The fresh catalyst exhibits a denitrification efficiency >90% at 200–300℃. With a K loading of 1 wt.% K, the denitrification efficiency is also >90% at 150–300℃. This indicates that the catalyst with a K loading exhibits a gain phenomenon at low temperatures.

[0083] Comparative Example 1

[0084] (1) Preparation of cerium manganese tungsten titanium composite oxide catalyst

[0085] According to the molar ratio of Ce, Mn, W, and Ti of 1:0.4:0.14:0.4, 8.6844 g of cerium nitrate, 2.8632 g of manganese nitrate, 0.6942 g of ammonium metatungstate, and 3.4 g of tetrabutyl titanate were weighed and added to distilled water, and stirred evenly. Then, ammonia water was added dropwise to adjust the pH to 10. The above sample was then allowed to stand for 24 hours for aging, followed by washing and filtration until neutral. The sample was then placed in an oven at 80°C for 24 hours for drying. After drying, it was placed in a muffle furnace and calcined at 600°C at a rate of 5°C / min for 3 hours to obtain a catalyst named CMWT-2.

[0086] (2) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst

[0087] 0.1g of potassium nitrate was dispersed in 20ml of distilled water, and then 1g of cerium manganese tungsten titanium composite oxide catalyst was added and stirred for 2h. The sample was then placed in an oven at 80℃ and dried for 24h. The dried sample was then placed in a muffle furnace and heated to 600℃ at 5℃ / min for 3h to obtain the alkali metal poisoned catalyst K-CMWT-2.

[0088] (3) Catalyst denitrification performance test

[0089] The fresh catalyst exhibits a denitrification efficiency >90% at 150–300℃. With a 1 wt.% K loading, the denitrification efficiency is also >90% at 200–250℃. No gain phenomenon was observed with the 1 wt.% K-loaded catalyst at low temperatures. The 1 wt.% K-loaded catalyst achieves a denitrification efficiency of 98% at 200℃, 5 vol.% H₂O, and 300 ppm SO₂, and its denitrification efficiency stabilizes above 50% after 12 hours.

[0090] Table 1 shows the denitrification activity of the catalyst prepared in this invention.

[0091]

Claims

1. A denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning, characterized in that, The catalyst uses F127 as a template agent, potassium nitrate as an alkali metal precursor, and cerium oxide, manganese oxide, tungsten oxide, and titanium oxide as denitrification active components. The molar ratio of Ce, Mn, W, and Ti is 1:(0.02~0.8):(0.02~0.30):(0.1~0.6); The preparation steps of this catalyst are as follows: (1) Preparation of template agent Add F127 to distilled water and stir in an oil bath until completely dissolved to obtain solution A; (2) Preparation of cerium manganese tungsten titanium composite oxide catalyst Add the cerium manganese tungsten titanium oxide precursor to solution A and stir until homogeneous; then place the above sample in an oven to dry, and finally calcine to obtain the cerium manganese tungsten titanium composite oxide catalyst; the sample drying temperature in step (2) is 80~100℃ and the drying time is 36~60h. (3) Preparation of alkali metal supported cerium manganese tungsten titanium catalyst The alkali metal precursor was added to distilled water and stirred until completely dissolved. Then, the cerium manganese tungsten titanium catalyst was added to the solution and stirred continuously. The sample was then dried in an oven and finally transferred to a muffle furnace for calcination.

2. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, The molar ratio of Ce, Mn, W, and Ti is 1:(0.2~0.6):(0.1~0.30):(0.1~0.6).

3. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, In step (1), the oil bath temperature is 30~50℃.

4. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, In step (2), the precursors of cerium manganese tungsten titanium oxide are cerium nitrate, manganese nitrate, ammonium metatungstate and tetrabutyl titanate.

5. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, In step (2), the mass ratio between the cerium manganese tungsten titanium oxide precursor and F127 is 12~17:1~6.

6. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, Step (2) The calcination temperature is 400~700℃, the calcination time is 1~5h, the calcination is a programmed temperature rise, and the temperature rise rate is 3~8℃ / min.

7. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, Step (3) The alkali metal precursor is potassium nitrate; the mass ratio of the cerium manganese tungsten titanium composite oxide catalyst to the alkali metal precursor is 100:0.5~3.

8. The denitrification catalyst with K-gain and resistance to water and sulfur composite poisoning as described in claim 1, characterized in that, Step (3) Drying temperature is 70~110℃, drying time is 10~24h; calcination temperature is 400~700℃, calcination time is 1~5h, calcination adopts programmed temperature rise, and the temperature rise rate is 3~8℃ / min.

9. The application of the catalyst according to claim 1 in denitrification.

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