Denitration catalyst production process and carbon footprint accounting method in production process thereof

Abstract

The invention discloses a denitration catalyst production process and a carbon footprint accounting method in the production process of the denitration catalyst production process. The method comprises the following steps of 1, defining a system boundary; step 2, stage division: further refining the accounting process into a raw material and auxiliary material acquisition stage, a raw material and auxiliary material transportation stage and a catalyst forming stage in a system boundary; 3, according to the production process of the denitration catalyst, a corresponding list data list is formulated, and collection of denitration catalyst production data is completed; 4, carbon emission sources and emission factors of the three stages are determined respectively, carbon footprint accounting models of the different stages are constructed, and carbon emission accounting of all the stages and the whole process is completed. And a corresponding carbon footprint accounting model is constructed, so that accurate accounting of the carbon footprint in the denitration catalyst production process is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of catalysts, in particular to the technical field of denitration catalysts. Background Art

[0002] Denitrification process is an important part of pollution reduction and carbon reduction, but while achieving efficient pollution reduction, it also generates a large amount of material and energy consumption. For example, the production and regeneration process of the catalyst consumes a large amount of raw materials and energy. In order to better promote the synergy of pollution reduction and carbon reduction, the low-carbon development of the denitrification process is the general trend. Therefore, it is necessary to simultaneously improve the denitrification performance of the denitrification catalyst and reduce its carbon footprint, that is, to develop high-performance, low-carbon footprint denitrification catalysts. Compared with the widely carried out research on the performance of denitrification catalysts, there is currently less research on the production carbon footprint assessment of denitrification catalysts, and a comprehensive and accurate accounting method has not yet been established.

[0003] The carbon footprint of denitrification catalyst production should calculate the total greenhouse gas emissions released during the entire life cycle of the total product production process, usually in carbon dioxide equivalent (kgCO2e) as the quantitative unit; however, the current research boundaries and inventory compilation of the carbon footprint of the denitrification catalyst production process are not comprehensive. Most of the research content is limited to carbon emissions caused by direct energy consumption or simplifies it, resulting in a certain impact on the accuracy of the carbon footprint calculation of the corresponding denitrification catalyst; for example, Liang Zengying et al. evaluated the energy consumption and environmental impact of the selective catalytic reduction (SCR) system throughout its entire life cycle (Zengying Liang, Xiaoqian Ma, Hai Lin, Yuting Tang. The energy consumption and environmental impacts of SCR technology in China[J]. Applied Energy, 2011, 88(4): p.1120-1129), including the production and transportation of manufacturing materials, installation and operation of SCR technology, etc. However, in the calculation, the catalyst module is simplified into steel and TiO2, that is, the catalyst is simplified as TiO2, ignoring the consumption of catalyst active components and additives, as well as the consumption of auxiliary materials and energy in the catalyst molding process, resulting in a large deviation in the final calculation results.

[0004] The defects of the prior art are: (1) Carbon footprint accounting for denitrification catalysts has been seldom carried out, and simplified treatments are often used for their production processes, resulting in incomplete demarcation of the production process system boundaries and large deviations in the accounting results; (2) The production process list for the honeycomb denitrification catalyst carbon accounting was not complete enough and failed to include all processes and all raw materials, auxiliary materials, energy and working fluids used; (3) There has been no relevant research that comprehensively considers the denitrification performance and carbon emission performance of denitrification catalysts, and the overall environmental impact of denitrification catalysts has not been adequately demonstrated. As a result, corresponding high-performance, low-carbon footprint denitrification catalysts have not been developed.

[0005] In summary, in order to develop high-performance, low-carbon footprint deNOx catalysts, it is necessary to reduce their carbon footprint while improving their deNOx efficiency. The latter currently requires ensuring the comprehensiveness and accuracy of the carbon emission assessment of deNOx catalyst production. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to propose a denitration catalyst production process and a carbon footprint accounting method during its production process, which can solve the above problems.

[0007] To achieve the above object, the present invention proposes a production process for a denitration catalyst, comprising the following steps: S0: Carrier preparation: Add TiO2 powder into a mixer, then add acidic silica sol and sulfuric acid, mix well and then take out and calcine in a high temperature furnace; S1: mixing; S2: Aging: The obtained mud is left to stand for 12-24 hours to allow the water to diffuse evenly; S3: Filtration and pre-extrusion: Place the clay in the pre-extruder to remove large particles and impurities in the clay to ensure the consistency and fluidity of the clay; S4: Extrusion molding: The filtered mud is fed into an extruder and extruded through a die into a honeycomb-shaped catalyst embryo; S5: Primary drying: Place the catalyst embryo into the drying chamber for preliminary drying; S6: Secondary drying: performing secondary drying on the catalyst embryo after primary drying; S7: Calcination: Calcination of the catalyst embryo after secondary drying to obtain the final denitration catalyst; S8: Cutting: Cut the calcined catalyst into modules of specific sizes according to requirements.

[0008] Preferably, the S1 comprises the following steps: S1.1: Dissolve the precursors of V and W in water to form a transparent solution; S1.2: Add TiO2 powder into the mixer and mix at high speed; S1.3: Add W solution and V solution in sequence; S1.4: Add silica fume, glass fiber, ammonia and other auxiliary materials, adjust the pH to 7 and stir until the moisture content is appropriate.

[0009] Preferably, in step S0, the calcination temperature is 500° C. and the calcination time is 6 hours.

[0010] Preferably, in step S0, the mass ratio of H2SO4 to TiO2 is 1:10.

[0011] Preferably, the denitration catalyst has V2O5 and WO3 as active components and TiO2-SiO2 as a composite carrier, and the expression is V2O5-WO3 / TiO2-SiO2, wherein the mass ratio of TiO2 to SiO2 is 3:7.

[0012] H2SO4 is introduced as a regulator during the preparation of the denitrification catalyst. On the one hand, it etches TiO2 to increase its surface irregularity, increase the specific surface area, and increase the contact between TiO2 and SiO2 to form more Ti-O-Si structures to enhance the acidity of the catalyst; on the other hand, the introduction of SO4 2- Stabilize the catalyst surface and reduce the agglomeration of the catalyst during the calcination process.

[0013] The present invention also proposes a method for calculating the carbon footprint of a denitration catalyst, comprising the following steps: Step 1: Define the system boundaries to ensure that all relevant aspects are taken into consideration; Step 2: Stage division: within the system boundary, further refine the accounting process into the raw material and auxiliary material acquisition stage, the raw material and auxiliary material transportation stage, and the catalyst formation stage; Step 3: Based on the above production process, formulate the corresponding inventory data list and complete the collection of denitration catalyst production data; Step 4: Determine the carbon emission sources and emission factors for the three stages respectively, build carbon footprint accounting models for different stages, and complete the carbon emission accounting for each stage and the entire process.

[0014] Preferably, in step 4, the carbon footprint quantification formula for the raw material and auxiliary material acquisition stage is as follows: (1), Where: C1 is the carbon footprint of the raw materials and auxiliary materials acquisition stage, in tons of carbon dioxide equivalent (tCO2e); n The total number of raw materials and auxiliary materials; M 1i For the i The amount of material obtained, in tons (t) or cubic meters (m 3 ) or liter (L); e 1i For the iThe carbon dioxide emission factor for the material acquisition stage is expressed in tons of carbon dioxide equivalent per ton (tCO2e / t) or tons of carbon dioxide equivalent per cubic meter (tCO2e / m 3 ) or tons of carbon dioxide equivalent per liter (tCO2e / L).

[0015] Preferably, in step 4, the carbon footprint quantification formula for the transportation of raw materials and auxiliary materials is as follows: (2), Where: C 2 is the carbon footprint of the transportation of raw materials and auxiliary materials, in tons of carbon dioxide equivalent (tCO2e); n The total number of raw materials and auxiliary materials; M 1i For the i The total amount of transported materials in tons (t) or cubic meters (m 3 ) or liters (L), which is theoretically basically the same as the raw material consumption; e 1i is the carbon dioxide emission factor corresponding to the mode of transport, in tons of carbon dioxide equivalent per ton (tCO2e / (t×km)); D 1i For the i The transportation distance of the material is in kilometers (km).

[0016] Preferably, in step 4, the carbon footprint quantification formula of the catalyst forming stage is as follows: (3), Where: C 3 is the carbon footprint of the catalyst forming stage, in tons of carbon dioxide equivalent (tCO2e); n The total number of substances and energy types consumed in the catalyst forming stage; M 3i The first stage of catalyst formation i The total amount of a substance or energy consumed, in tons (t) or cubic meters (m 3 ) or liter (L) or kilowatt-hour (kWh); e 3i The first iThe carbon dioxide emission factor of a substance or energy source is expressed in tons of carbon dioxide equivalent per ton (tCO2e / t) or tons of carbon dioxide equivalent per cubic meter (tCO2e / m 3 ) or tonnes of carbon dioxide equivalent per litre (tCO2e / L) or tonnes of carbon dioxide equivalent per megawatt-hour (tCO2e / MWh).

[0017] Beneficial effects of the present invention: The present invention designs a high-performance, low-carbon footprint denitration catalyst, which is modified on the basis of a conventional denitration catalyst to improve the denitration efficiency while reducing carbon emissions during the catalyst production process; In terms of the carbon emission performance of the catalyst, a method for calculating carbon emissions from the production process of honeycomb denitrification catalysts was first proposed. This method comprehensively analyzed the entire production process of honeycomb catalysts, from raw material acquisition and mixing to catalyst forming, roasting, cutting and packaging, and constructed a corresponding carbon footprint calculation model to achieve accurate calculation of the carbon footprint of the denitrification catalyst production process. In terms of catalyst performance, the denitrification efficiency of the catalysts before and after modification was tested under the same conditions, verifying the excellent catalytic performance of the modified catalysts. The present invention constructs a high-performance, low-carbon footprint denitrification catalyst, which provides technical support for the comprehensive development of high-efficiency, low-carbon footprint denitrification technology and helps achieve coordinated pollution reduction and carbon reduction.

[0018] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a production life cycle system boundary diagram of the denitration catalyst of the present invention; Figure 2 This is a production process flow chart of the denitration catalyst of the present invention; Figure 3 This is a schematic diagram comparing the carbon footprints of the production processes of conventional and low-carbon formula denitrification catalysts; Figure 4 This is a schematic diagram comparing the catalytic performance of conventional and low-carbon formula denitrification catalyst production processes. DETAILED DESCRIPTION

[0020] The present invention improves the denitration catalyst, using V2O5 and WO3 as active components and TiO2-SiO2 as a composite carrier, expressed as V2O5-WO3 / TiO2-SiO2, wherein the mass ratio of TiO2 to SiO2 is 3:7.

[0021] Based on the conventional V2O5-WO3 / TiO2 catalyst, the present invention introduces the acidic additive SiO2 to replace part of the carrier TiO2 to form a TiO2-SiO2 composite carrier, enhances the acidity of the carrier, and adds H2SO4 to etch the surface to increase the acidity of the catalyst and maintain the specific surface area during the calcination process.

[0022] The present invention introduces H2SO4 as a regulator, and the mass ratio of H2SO4 to TiO2 is 1:10. On the one hand, H2SO4 etches TiO2 to increase its surface irregularity, increase the specific surface area, and increase the contact between TiO2 and SiO2 to form more Ti-O-Si structures to enhance the acidity of the catalyst; on the other hand, the introduction of SO4 2- Stabilize the catalyst surface and reduce the agglomeration of the catalyst during the calcination process.

[0023] The production process of the denitration catalyst includes the following steps: S0: Support preparation: TiO2 powder was added into a mixer, followed by the addition of acidic silica sol and sulfuric acid. After mixing evenly, the mixture was taken out and calcined in a high-temperature furnace at 500°C for 6 h. S1: Mixing: ① Dissolve the precursors of V and W in water to form a transparent solution; ② Add TiO2 powder to the mixer and mix at high speed; ③ Add W solution and V solution in sequence; ④ Add auxiliary materials such as silicon powder, glass fiber, and ammonia water, adjust the pH to 7, and stir until the water content is appropriate; S2: Aging: The obtained mud is left to stand for 12-24 hours to allow the water to diffuse evenly; S3: Filtration and pre-extrusion: Place the clay in the pre-extruder to remove large particles and impurities in the clay to ensure the consistency and fluidity of the clay; S4: Extrusion molding: The filtered mud is fed into an extruder and extruded through a die into a honeycomb-shaped catalyst embryo; S5: Primary drying: Place the catalyst embryo into the drying chamber for preliminary drying; S6: Secondary drying: performing secondary drying on the catalyst embryo after primary drying; S7: Calcination: Calcination of the catalyst embryo after secondary drying at 550°C to obtain the final denitration catalyst; S8: Cutting: Cut the calcined catalyst into modules of specific sizes according to requirements.

[0024] In order to conveniently distinguish the two denitrification catalysts, the catalyst before modification is called conventional formula, and the catalyst after modification is called low-carbon formula.

[0025] Carbon footprint calculation method: i. Define the system boundaries to ensure that all relevant links are taken into consideration. The system boundary diagram of the denitrification catalyst production life cycle is as follows: Figure 1shown.

[0026] ii. Stage division: within the system boundary, the accounting process is further divided into the raw material and auxiliary material acquisition stage, the raw material and auxiliary material transportation stage, and the catalyst formation stage; iii. Based on the production process of honeycomb denitrification catalyst, formulate the corresponding inventory data list and complete the collection of denitrification catalyst production data; iv. Determine the carbon emission sources and emission factors for the three stages respectively, construct carbon footprint accounting models for different stages, and complete the carbon emission accounting for each stage and the entire process.

[0027] As mentioned above, the production process of deNOx catalysts can be further divided into the raw material and auxiliary material acquisition stage, the raw material and auxiliary material transportation stage, and the catalyst forming stage, and carbon footprint accounting can be carried out in stages and throughout the process.

[0028] a) Raw material and auxiliary material acquisition stage: This stage begins with the mining of natural resources. Subsequently, through a series of high-tech and environmentally friendly processes, these raw materials are converted into the raw materials required for the production of denitrification catalysts. Taking the unmodified V2O5-WO3 / TiO2 catalyst as an example, the raw materials include vanadium salts, tungsten salts and titanium dioxide and auxiliary materials such as deionized water, ammonia water, methyl cellulose, polyethylene oxide and glass fiber.

[0029] b) Raw materials and auxiliary materials transportation stage: This stage focuses on the transportation process of the substances required in the production process of deNOx catalysts, that is, the process of transporting the relevant raw materials and auxiliary materials from the place of production to the catalyst production location through corresponding transportation methods (such as trains, trucks, etc.).

[0030] c) Catalyst forming stage: This stage focuses on the forming process of the denitrification catalyst, including the material / energy consumption during mixing, aging, filtration and pre-extrusion, extrusion molding, primary drying, secondary drying, roasting, cutting, etc., mainly water consumption and electricity consumption.

[0031] Carbon emissions at each stage are calculated using the following formula; a) The carbon footprint quantification of the raw material and auxiliary material acquisition stages is shown in Formula 1: (1), Where: C1 - Carbon footprint of raw materials and auxiliary materials acquisition stage, in tons of carbon dioxide equivalent (tCO2e); n — the total number of types of raw and auxiliary materials; M 1i ——No. i The amount of material obtained, in tons (t) or cubic meters (m 3 ) or liter (L); e 1i ——No. i The carbon dioxide emission factor for the material acquisition stage is expressed in tons of carbon dioxide equivalent per ton (tCO2e / t) or tons of carbon dioxide equivalent per cubic meter (tCO2e / m 3 ) or tons of carbon dioxide equivalent per liter (tCO2e / L).

[0032] b) Quantification of carbon footprint of raw materials and auxiliary materials transportation stage is shown in Formula 2: (2), Where: C 2——Carbon footprint of the transportation of raw materials and auxiliary materials, in tons of carbon dioxide equivalent (tCO2e); n — the total number of types of raw and auxiliary materials; M 1i ——No. i The total amount of transported materials in tons (t) or cubic meters (m 3 ) or liters (L), which is theoretically basically the same as the raw material consumption; e 1i - the CO2 emission factor corresponding to the mode of transport, in tons of CO2 equivalent per ton (tCO2e / (t×km)); D 1i ——No. i The transportation distance of the material, in kilometers (km); c) Quantification of carbon footprint of catalyst formation stage is shown in Equation 3: (3) Where: C 3 - Carbon footprint of the catalyst formation stage, in tons of carbon dioxide equivalent (tCO2e); n —The total number of substances and energy types consumed in the catalyst forming stage; M 3i ——Catalyst forming stage i The total amount of a substance or energy consumed, in tons (t) or cubic meters (m 3 ) or liter (L) or kilowatt-hour (kWh); e 3i ——The first iThe carbon dioxide emission factor of a substance or energy source is expressed in tons of carbon dioxide equivalent per ton (tCO2e / t) or tons of carbon dioxide equivalent per cubic meter (tCO2e / m 3 ) or tonnes of carbon dioxide equivalent per litre (tCO2e / L) or tonnes of carbon dioxide equivalent per megawatt-hour (tCO2e / MWh); 2) Data Collection The carbon emissions of the denitrification catalyst before and after modification were calculated based on actual data. The original data came from the production process of a honeycomb denitrification catalyst manufacturer in Zhejiang Province. The manufacturer can simultaneously realize the mixing and molding process, and there is no intermediate mud transportation process. Its production system includes the following processes: raw material dissolution, mixing, aging, filtration pre-extrusion, extrusion, primary drying, secondary drying, roasting, cutting, etc. The flow chart is as follows Figure 2 shown.

[0033] Table 1 shows the on-site production data of the denitrification catalyst manufacturer before and after modification (per ton of catalyst produced).

[0034] Table 1

[0035]

[0036]

[0037] Carbon footprint accounting: Regular recipe: C1= 0.013×1.7832 + 0.064×16.8944 + 0.027×17.206 + 0.88×5.6459 +0.07×0.003126 + 1.75×4.22×10 -5 + 0.088×3.7197 + 0.040×2.750 + 0.002×4.6962 + 0.002×1.832 = 7.02 tCO2eq; C2= (0.013×1500 + 0.064×1500 + 0.027×200 + 0.88×500 + 0.07×150 +1.75×100 + 0.088×100 + 0.040×200 + 0.002×300 + 0.002×150) × 0.0892 / 1000= 0.068 tCO2eq; C3= 4.24×1.028568 + 0.1×0.00302 = 4.36 tCO2eq; C = 7.02 + 0.068 + 4.36 = 11.45 tCO2eq / t; Low carb recipe: C1= 0.013×1.7832 + 0.064×16.8944 + 0.027×17.206 + 0.264×2.2577 +0.062×-0.2998 + 0.616×5.6459 + 0.07×0.003126 + 1.75×4.22×10 -5 + 0.104×3.7197 + 0.040×2.750 + 0.002×4.6962 + 0.002×1.832 = 6.13 tCO2eq; C2= (0.013×1500 + 0.064×1500 + 0.027×200 + 0.616×500 + 0.264×500+ 0.062×200 + 20.07×150 + 1.75×100 + 0.088×100 + 0.040×200 + 0.002×300+ 0.002×150) × 0.0892 / 1000 = 0.069 tCO2eq; C3= 4.24×1.028568 + 0.1×0.00302 = 4.36 tCO2eq; C = 6.13 + 0.069 + 4.36 = 10.56 tCO2eq / t; Carbon reduction efficiency: (C 常规 -C 低碳 ) / C 常规 = 7.78%; The carbon footprint of the production process of the improved denitration catalyst of the present invention is reduced by 7.78%, greatly improving low carbonization.

[0038] Comparison results of catalysts before and after improvement are as follows: Figure 3 shown.

[0039] (3) Denitrification performance 1) Test conditions 0.20 g of the catalyst was placed in a fixed bed quartz tube reactor with an inner diameter of 8 mm. The simulated flue gas flow rate was 500 mL / min, containing 700 ppm NO, 700 ppm NH3, 5% O2, and N2 as the balance gas. The reaction space velocity was 125,000 h -1 , the reaction temperature is 250-400 °C, and the gas composition is detected online by Antaris IGS gas analyzer.

[0040] 2) Catalytic performance Under the test conditions of 250-400℃, the experimental results of the catalyst before and after improvement are as follows: Figure 4As shown, it can be concluded that the activity of the low-carbon formula denitrification catalyst is better than that of the conventional formula denitrification catalyst; combined with the carbon emission performance calculation results, the present invention successfully developed a high-performance low-carbon footprint denitrification catalyst.

[0041] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A method for calculating the carbon footprint of a denitration catalyst, characterized in that: The following steps are involved: Step 1: Define the system boundaries to ensure that all relevant aspects are taken into consideration; Step 2: Stage division: within the system boundary, further refine the accounting process into the raw material and auxiliary material acquisition stage, the raw material and auxiliary material transportation stage, and the catalyst formation stage; Step 3: Based on the production process of denitrification catalyst, formulate the corresponding inventory data list and complete the collection of denitrification catalyst production data; Step 4: Determine the carbon emission sources and emission factors for the three stages respectively, build carbon footprint accounting models for different stages, and complete the carbon emission accounting for each stage and the entire process.

2. The carbon footprint calculation method of a denitration catalyst according to claim 1, wherein: In step 4, the carbon footprint quantification formula for the raw material and auxiliary material acquisition stage is as follows: （1）， Where: C1 is the carbon footprint of the raw materials and auxiliary materials acquisition stage, in tons of carbon dioxide equivalent; n The total number of raw materials and auxiliary materials; M 1i For the i The amount of material obtained, in tons or cubic meters or liters; e 1i For the i The carbon dioxide emission factor during the material acquisition stage is expressed in tons of carbon dioxide equivalent per ton, tons of carbon dioxide equivalent per cubic meter, or tons of carbon dioxide equivalent per liter.

3. The carbon footprint calculation method of a denitration catalyst according to claim 1, wherein: In step 4, the carbon footprint quantification formula for the transportation of raw materials and auxiliary materials is as follows: （2）， Where: C 2 is the carbon footprint of the transportation of raw materials and auxiliary materials, in tons of carbon dioxide equivalent; n The total number of raw materials and auxiliary materials; M 1i For the i The total amount of material transported, in tons or cubic meters or liters, which is theoretically consistent with the raw material consumption; e 1i is the CO2 emission factor corresponding to the mode of transport, in tons of CO2 equivalent per ton; D 1i For the i The transportation distance of the material in kilometers.

4. The carbon footprint calculation method of a denitration catalyst according to claim 1, wherein: In step 4, the carbon footprint quantification formula of the catalyst forming stage is as follows: （3）， Where: C 3 is the carbon footprint of the catalyst forming stage, in tons of carbon dioxide equivalent; n The total number of substances and energy types consumed in the catalyst forming stage; M 3i The first stage of catalyst formation i The total amount of consumption of a substance or energy, in tons or cubic meters or liters or kilowatt-hours; e 3i The first i The carbon dioxide emission factor of a substance or energy is expressed in tons of carbon dioxide equivalent per ton, tons of carbon dioxide equivalent per cubic meter, tons of carbon dioxide equivalent per litre, or tons of carbon dioxide equivalent per megawatt-hour.

5. A production process for a denitration catalyst, characterized in that: The following steps are involved: S0: Carrier preparation: Add TiO2 powder into a mixer, then add acidic silica sol and sulfuric acid, mix well and then take out and calcine in a high temperature furnace; S1: mixing; S2: Aging: The obtained mud is left to stand for 12-24 hours to allow the water to diffuse evenly; S3: Filtration and pre-extrusion: Place the clay in the pre-extruder to remove large particles and impurities in the clay to ensure the consistency and fluidity of the clay; S4: Extrusion molding: The filtered mud is fed into an extruder and extruded through a die into a honeycomb-shaped catalyst embryo; S5: Primary drying: Place the catalyst embryo into the drying chamber for preliminary drying; S6: Secondary drying: performing secondary drying on the catalyst embryo after primary drying; S7: Calcination: Calcination of the catalyst embryo after secondary drying to obtain the final denitration catalyst; S8： Cutting: The calcined catalyst is cut into modules of specific sizes according to requirements.

6. The production process of the denitration catalyst according to claim 5, characterized in that: Said S1 comprises the following steps: S1.1: Dissolve the precursors of V and W in water to form a transparent solution; S1.2: Add TiO2 powder into the mixer and mix well; S1.3: Add W solution and V solution in sequence; S1.4: Add silica fume, glass fiber, ammonia and other auxiliary materials, adjust the pH to 7 and stir until the moisture content is appropriate.

7. The production process of the denitration catalyst according to claim 5, characterized in that: In the step S0, the calcination temperature is 500° C. and the calcination time is 6 hours.

8. The production process of the denitration catalyst according to claim 5, characterized in that: In the step S0, the mass ratio of H2SO4 to TiO2 is 1:

10.

9. The production process of the denitration catalyst according to claim 5, characterized in that: The denitration catalyst has V2O5 and WO3 as active components and TiO2-SiO2 as a composite carrier, and the expression is V2O5-WO3 / TiO2-SiO2, wherein the mass ratio of TiO2 to SiO2 is 3:7.

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