An external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst and its preparation method and application

Abstract

This invention discloses a method for preparing and applying a field-enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst. The catalyst uses titanium dioxide as a carrier, a composite oxide of cerium oxide and niobium oxide as the active component, ferrosoferric oxide as a morphology control agent, and a relay-coupled electromagnet as a morphology controller. Based on the carrier mass, the mass percentage of the active component is 10-20%, and the mass percentage of the morphology control agent is 5-10%. The catalyst synthesized by this method has advantages such as high specific surface area, good hydrophobicity, and dust filtration, and can achieve the goal of stationary source low-temperature denitrification and dechlorobenzene.

Description

Technical Field

[0001] The invention relates to an external field enhanced microfluidic ellipsoidal denitration and dechlorobenzene catalyst, a preparation method and application thereof, and belongs to the field of air pollution control. Background Art

[0002] Nitrogen oxides are one of the main pollutants causing air pollution. x The main sources of emissions include industrial boilers, thermal power plants, steel mills, cement plants, etc. Chlorobenzene, as a typical chlorine-containing organic compound, is highly persistent in the environment and easily enters water bodies, soil, and the atmosphere, with serious impacts on the ecological environment and human health. Chlorobenzene and its derivatives can cause chronic toxicity to aquatic organisms, soil organisms, and humans, and their degradation process is slow, easily accumulating in the environment, leading to serious pollution problems. Therefore, the study of efficient degradation and removal methods for chlorobenzene is of great practical significance.

[0003] SCR technology is a method of using ammonia or urea to react with NO x Reaction, through the catalyst to accelerate the reaction process, to achieve efficient removal of NO x This technology can achieve high efficiency removal of NO at lower operating temperature. x , and has low operating costs and wide applicability, so it is widely used in industrial denitrification. As a highly efficient pollutant treatment technology, catalytic oxidation performs well in the degradation of organic matter. Compared with traditional thermal treatment and physical adsorption methods, catalytic oxidation has lower energy consumption, higher efficiency and lower by-product generation. The catalytic oxidation of chlorobenzene is particularly important in environmental pollution control. It can achieve efficient degradation of chlorobenzene at a lower temperature, reduce the concentration of chlorobenzene, and thus reduce its harm to the environment.

[0004] Traditional SCR catalysts usually use titanium-based, niobium-based and molybdenum-based catalysts, but these catalysts are easily affected by poisonous substances such as sulfur, lead, and dust during long-term use at high temperatures, resulting in a decrease in catalyst activity. At the same time, high-temperature SCR means that companies need to heat the exhaust gas, which will further increase corporate governance costs. x and chlorobenzene often exist in industrial waste gas at the same time, so a method that can remove NO x In recent years, researchers have adjusted the composition and structure of the catalyst to enable it to catalyze the simultaneous catalysis of NO x and chlorobenzene. For example, transition metal oxide catalysts have good NO x The reduction performance and organic matter oxidation capacity can achieve denitrification and dechlorobenzene at low temperature. xGas components such as chlorobenzene and chlorinated benzene may poison the catalyst, causing it to fail. Therefore, improving the catalyst's resistance to poisoning and extending its service life are key research topics. Summary of the Invention

[0005] The purpose of the present invention is to address the current status and existing problems of the existing fixed source complex flue gas treatment, and to propose an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst and its preparation method and application.

[0006] A field-enhanced microfluidic ellipsoidal denitration and dechlorobenzene catalyst is characterized in that: the catalyst uses titanium dioxide as a carrier, a composite oxide of cerium oxide and niobium oxide as an active component, ferrosoferric oxide as a morphology control agent, and a relay-coupled electromagnet as a morphology controller; the catalyst is prepared by a solvent thermal growth-field-enhanced microfluidic spinning combined method; wherein, based on the mass of the carrier, the mass percentage of the active component is 10-20%, the mass percentage of the morphology control agent is 5-10%, and the mass ratio of cerium oxide to niobium oxide in the active component is 1:(0.5-2).

[0007] The preparation method of the catalyst is as follows:

[0008] (1) Preparation of active components by solvent thermal growth method

[0009] Weighing cerium salt, niobium salt, iron salt, (R)-3-hydroxypyrrolidine hydrochloride, sodium thiosulfate, and deionized water, mixing them evenly, placing them in a hydrothermal reactor for hydrothermal reaction, filtering and drying after the reaction, and then placing them in a muffle furnace for low-temperature calcination to obtain a mixed powder of the active component and the morphology control agent;

[0010] (2) Preparation of polyacrylonitrile nanofibers by external field enhanced microfluidic spinning

[0011] Weigh polyacrylonitrile and ethyl acetate and add the mixed powder prepared in step (1) and mix evenly to form spinning solution A; weigh polyacrylonitrile and ethyl acetate and add titanium salt and mix evenly to form spinning solution B; connect two syringes to the dual channels of the microfluidic chip respectively; then use the dual channels of the microfluidic chip to respectively introduce spinning solution A and spinning solution B; add a relay coupling electromagnet at the tail end of the microfluidic chip; use the relay to control the electromagnet to form an intermittent magnetic field; finally, spin the mixed spinning solution through a microfluidic electrostatic integrated machine to obtain polyacrylonitrile nanofibers loaded with active components and morphology control agents;

[0012] (3) Preparation of catalyst by calcination

[0013] The polyacrylonitrile nanofibers prepared in step (2) are dried and shaped in an oven at high temperature, and then placed in a muffle furnace and calcined at a rapid temperature to obtain an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst.

[0014] In the technical solution of the present invention: the cerium salt described in step (1) is cerium nitrate hexahydrate or cerium chloride, the niobium salt is niobium pentachloride, the iron salt is ferric nitrate nonahydrate or ferric chloride hexahydrate, and the mass ratio of the cerium salt, (R)-3-hydroxypyrrolidine hydrochloride, sodium thiosulfate, and deionized water is 1: (1-2): (3-4): (100-200).

[0015] In the technical solution of the present invention: the temperature of the hydrothermal reaction in step (1) is 140-180°C, the time of the hydrothermal reaction is 4-8 hours, the temperature of the drying is 80-100°C, the time of the drying is 6-12 hours, the temperature of the low-temperature roasting is 300-400°C, and the time of the low-temperature roasting is 2-4 hours.

[0016] In the technical solution of the present invention: the mass ratio of polyacrylonitrile, ethyl acetate and mixed powder described in step (2) is 1: (6-12): (0.5-1).

[0017] In the technical solution of the present invention: the mass ratio of polyacrylonitrile, ethyl acetate and titanium salt described in step (2) is 1: (6-12): (1-2), and the titanium salt is tetrabutyl titanate or tetraethyl titanate.

[0018] In the technical solution of the present invention: the relay described in step (2) is a solid-state relay, which implements a cyclic instruction of energizing the electromagnet for 0.1~0.5s and then deenergizing it for 5~10s. The electromagnet is an iron wire with a diameter of 2~3mm wound around a metal rod with a diameter of 10~20cm.

[0019] In the technical solution of the present invention: the spinning voltage in step (2) is 15~25kV, and the injection rate of the syringe is 0.5~1.5mL / h.

[0020] In the technical solution of the present invention: the high-temperature drying temperature described in step (3) is 100~130℃, the high-temperature drying time is 4~8h, the rapid heating rate is 10~20℃ / min, the roasting temperature is 500~600℃, and the roasting time is 2~4h.

[0021] In the technical solution of the present invention: the above catalyst is used in fixed source low-temperature denitration and dechlorobenzene.

[0022] In the technical solution of the present invention: the above-mentioned fixed sources specifically refer to coal-fired power plants, waste incineration, steel sintering, and dry cement industry.

[0023] The experimental conditions for evaluating the catalyst activity of the present invention are as follows: 1 mL of a 20-40 mesh catalyst was poured into a 6 mm inner diameter quartz tube, secured with quartz wool and wire mesh. The tube was then placed in a tube furnace, and the actual catalytic reaction temperature was adjusted by controlling the heating temperature of the tube furnace. The inlet gas components included: NO (800 ppm), NH3 (800 ppm), O2 (10 vol.%), chlorobenzene (400 ppm), SO2 (200 ppm), H2O (5 vol.%), and the remainder was N2. The total gas flow rate was 500 mL / min, and the temperature was controlled between 120 and 240°C, with 30-minute dwell times at 30°C. The chlorobenzene concentration was measured by gas chromatography, and the NO concentration was measured by a flue gas analyzer. Within the temperature range of 150-210°C, the catalyst's dechlorobenzene and denitrification efficiencies were both above 90%.

[0024] Beneficial effects:

[0025] (1) In the present invention, sodium thiosulfate is used as a weak reducing agent to partially reduce the iron salt, and then a solvothermal method is used to prepare a magnetic ferroferric oxide morphology control agent powder. At the same time, (R)-3-hydroxypyrrolidine hydrochloride is used as a morphology control agent in the solvothermal method to thermally generate nanosphere particles from cerium salt, niobium salt and iron salt. Cerium oxide, niobium oxide and ferroferric oxide all have excellent redox properties and can catalytically reduce NO at low temperatures. x and catalytic oxidation of chlorobenzene;

[0026] (2) In the present invention, polyacrylonitrile nanofibers are prepared by microfluidic spinning, ethyl acetate is used as a solvent, polyacrylonitrile is used as a template, and titanium salt is fused to prepare a titanium dioxide carrier. At the same time, the dual channels of the microfluidic chip are used to dissolve the mixed powder of cerium oxide, niobium oxide and ferroferric oxide in the spinning solution. The dual channels can promote the uniform mixing of the carrier and the mixed powder, thereby promoting the uniform loading of the active component and the morphology control agent on the titanium dioxide carrier;

[0027] (3) In the present invention, a solid-state relay is used to control an electromagnet to form an intermittent magnetic field. After the relay is coupled to the electromagnet as a morphology controller to generate an intermittent weak magnetic field, the nano-iron tetroxide powder in the spinning solution can be used to form a nano-ellipsoidal structure when the spinning mixture is ejected from the spinning machine. Therefore, the catalyst can form a state in which nanofibers and nano-ellipsoidal structures coexist in the microscopic morphology.

[0028] (4) In the present invention, polyacrylonitrile nanofibers are used as templates to form nanofibers and nano-ellipsoidal structures in the catalyst after calcination. The nanofibers can partially filter dust during the flue gas treatment process, and the ellipsoidal structure can change the microscopic airflow field of the catalyst, thereby avoiding physical poisoning of the catalyst due to excessive deposition of toxic substances such as dust and ammonium bisulfate.

[0029] Therefore, the catalyst prepared by the present invention not only has excellent low-temperature denitration and dechlorobenzene performance, but also has good resistance to sulfur poisoning and a certain dust filtration effect. In addition, the catalyst component is environmentally friendly, has a simple preparation process, low cost, high cost performance, and has strong application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the equipment principle for preparing the catalyst in Example 1;

[0031] Figure 2 This is the SEM image of the catalyst prepared in Example 1;

[0032] Figure 3 This is a graph of the denitration efficiency of the catalysts prepared in Examples 1-3;

[0033] Figure 4 This is a graph showing the dechlorobenzene efficiency of the catalysts prepared in Examples 1-3. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the following examples. The examples are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operating processes. However, the protection scope of the present invention is not limited to the following examples. Example 1

[0035] (1) Preparation of active components by solvent thermal growth method

[0036] 2.523 g of cerium nitrate hexahydrate, 1.016 g of niobium pentachloride, 3.926 g of ferric nitrate nonahydrate, 2.523 g of (R)-3-hydroxypyrrolidine hydrochloride, 7.569 g of sodium thiosulfate, and 252.300 g of deionized water were weighed and mixed evenly, placed in a hydrothermal reactor for hydrothermal reaction at 140°C for 8 h, and after the reaction was completed, filtered and placed in an oven for drying at 80°C for 12 h, and then placed in a muffle furnace for low-temperature roasting at 300°C for 4 h to obtain a mixed powder of the active component and the morphology control agent;

[0037] (2) Preparation of polyacrylonitrile nanofibers by external field enhanced microfluidic spinning

[0038] Weigh 4.500g of polyacrylonitrile and 27.000g of ethyl acetate and add 2.250g of the mixed powder prepared in step (1) and mix them evenly to form spinning solution A. Weigh 63.917g of polyacrylonitrile and 383.502g of ethyl acetate and add 63.917g of tetrabutyl titanate and mix them evenly to form spinning solution B. Figure 1As shown, two syringes were connected to the dual channels of the microfluidic chip respectively, and then the dual channels of the microfluidic chip were used to introduce spinning solution A and spinning solution B respectively. A solid-state relay was added to the tail end of the microfluidic chip to couple the electromagnet (the electromagnet was a 2 mm diameter iron wire wrapped around a 10 cm diameter metal rod). The electromagnet was controlled by the relay to form an intermittent magnetic field (a cycle instruction of powering the electromagnet for 0.1 seconds and then powering off for 5 seconds). Finally, the mixed spinning solution was spun by a microfluidic electrostatic integrated machine (spinning voltage was 15 kV, and the injection rate of the syringe was 0.5 mL / h), obtaining polyacrylonitrile nanofibers loaded with active components and morphology control agents.

[0039] (3) Preparation of catalyst by calcination

[0040] The polyacrylonitrile nanofibers prepared in step (2) were dried in an oven at 100°C for 8 h to set the shape, and then placed in a muffle furnace and rapidly heated to 500°C at a heating rate of 10°C / min and calcined for 4 h to obtain an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component is 10%, the mass percentage of the morphology control agent is 5%, the mass ratio of cerium oxide to niobium oxide in the active component is 1:0.5, and the SEM image of the catalyst is as follows Figure 2 shown);

[0041] (4) Catalytic activity test

[0042] 1 mL of the catalyst (20-40 mesh) was poured into a 6 mm inner diameter quartz tube, secured with quartz wool and wire mesh. The tube was then placed in a tube furnace, and the actual reaction temperature was controlled by controlling the furnace's heating temperature. The inlet gas composition consisted of NO (800 ppm), NH3 (800 ppm), O2 (10 vol.%), chlorobenzene (400 ppm), SO2 (200 ppm), H2O (5 vol.%), and the remainder was N2. The total gas flow rate was 500 mL / min, and the temperature was controlled between 120 and 240°C, with 30-minute dwell times at 30°C intervals. Chlorobenzene concentration was measured by gas chromatography, and NO concentration was measured by flue gas analyzer. Both chlorobenzene removal and denitrification efficiencies of the catalyst were above 90% within the temperature range of 150-210°C. Example 2

[0043] (1) Preparation of active components by solvent thermal growth method

[0044] 0.716 g of cerium chloride, 2.033 g of niobium pentachloride, 2.627 g of ferric chloride hexahydrate, 1.432 g of (R)-3-hydroxypyrrolidine hydrochloride, 2.864 g of sodium thiosulfate, and 143.200 g of deionized water were weighed and mixed evenly, placed in a hydrothermal reactor for hydrothermal reaction at 180° C. for 4 h. After the reaction, the mixture was filtered and dried in an oven at 100° C. for 6 h, and then placed in a muffle furnace for low-temperature roasting at 400° C. for 2 h to obtain a mixed powder of the active component and the morphology control agent;

[0045] (2) Preparation of polyacrylonitrile nanofibers by external field enhanced microfluidic spinning

[0046] Weigh 2.250g of polyacrylonitrile and 27.000g of ethyl acetate and add 2.250g of the mixed powder prepared in step (1) and mix them evenly to form spinning solution A. Weigh 10.711g of polyacrylonitrile and 128.532g of ethyl acetate and add 21.421g of tetraethyl titanate and mix them evenly to form spinning solution B. Connect two syringes to the dual channels of the microfluidic chip respectively, and then use the dual channels of the microfluidic chip to respectively introduce spinning solution A and spinning solution B. Add a solid-state relay coupling electromagnet at the tail end of the microfluidic chip (the electromagnet is a 3mm diameter iron wire wrapped around a 20cm diameter metal rod), use the relay to control the electromagnet to form an intermittent magnetic field (perform a cycle instruction of powering on the electromagnet for 0.5s and then powering off for 10s), and finally spin the mixed spinning solution through a microfluidic electrostatic integrated machine (spinning voltage is 25kV, and the injection rate of the syringe is 1.5mL / h) to obtain polyacrylonitrile nanofibers loaded with active components and morphology control agents;

[0047] (3) Preparation of catalyst by calcination

[0048] The polyacrylonitrile nanofibers prepared in step (2) were dried in an oven at 130°C for 4 h to set the shape, and then placed in a muffle furnace and rapidly heated to 600°C at a heating rate of 20°C / min and calcined for 2 h to prepare an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component was 20%, the mass percentage of the morphology control agent was 10%, and the mass ratio of cerium oxide to niobium oxide in the active component was 1:2);

[0049] (4) Catalytic activity test

[0050] 1 mL of the catalyst (20-40 mesh) was poured into a 6 mm inner diameter quartz tube, secured with quartz wool and wire mesh. The tube was then placed in a tube furnace, and the actual reaction temperature was controlled by controlling the furnace's heating temperature. The inlet gas composition consisted of NO (800 ppm), NH3 (800 ppm), O2 (10 vol.%), chlorobenzene (400 ppm), SO2 (200 ppm), H2O (5 vol.%), and the remainder was N2. The total gas flow rate was 500 mL / min, and the temperature was controlled between 120 and 240°C, with 30-minute dwell times at 30°C intervals. Chlorobenzene concentration was measured by gas chromatography, and NO concentration was measured by flue gas analyzer. Both chlorobenzene removal and denitrification efficiencies of the catalyst were above 90% within the temperature range of 150-210°C. Example 3

[0051] (1) Preparation of active components by solvent thermal growth method

[0052] 1.074 g of cerium chloride, 1.525 g of niobium pentachloride, 3.926 g of ferric nitrate nonahydrate, 1.611 g of (R)-3-hydroxypyrrolidine hydrochloride, 3.759 g of sodium thiosulfate, and 161.100 g of deionized water were weighed and mixed evenly, and then placed in a hydrothermal reactor for hydrothermal reaction at 160° C. for 6 h. After the reaction, the mixture was filtered and dried in an oven at 90° C. for 8 h, and then placed in a muffle furnace for low-temperature calcination at 350° C. for 3 h to obtain a mixed powder of the active component and the morphology control agent.

[0053] (2) Preparation of polyacrylonitrile nanofibers by external field enhanced microfluidic spinning

[0054] 3.222 g of polyacrylonitrile and 32.220 g of ethyl acetate were weighed and added with 2.250 g of the mixed powder prepared in step (1) and mixed evenly to form a spinning solution A. 19.041 g of polyacrylonitrile and 190.410 g of ethyl acetate were weighed and added with 28.561 g of tetraethyl titanate and mixed evenly to form a spinning solution B. Two syringes were connected to the dual channels of the microfluidic chip respectively, and then the dual channels of the microfluidic chip were used to respectively introduce the spinning solution A and the spinning solution B. A solid-state relay-coupled electromagnet was added to the tail end of the microfluidic chip (the electromagnet was a 2.5 mm diameter iron wire wound on a 15 cm diameter metal rod), and the electromagnet was controlled by the relay to form an intermittent magnetic field (a cycle instruction of energizing the electromagnet for 0.3 seconds and then de-energizing for 8 seconds). Finally, the mixed spinning solution was spun by a microfluidic electrostatic integrated machine (the spinning voltage was 20 kV and the injection rate of the syringe was 1.0 mL / h) to obtain polyacrylonitrile nanofibers loaded with active components and morphology control agents.

[0055] (3) Preparation of catalyst by calcination

[0056] The polyacrylonitrile nanofibers prepared in step (2) were dried in an oven at 120°C for 6 h to set the shape, and then placed in a muffle furnace and rapidly heated to 550°C at a heating rate of 15°C / min and calcined for 3 h to obtain an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component was 15%, the mass percentage of the morphology control agent was 7.5%, and the mass ratio of cerium oxide to niobium oxide in the active component was 1:1);

[0057] (4) Catalytic activity test

[0058] 1 mL of the catalyst (20-40 mesh) was poured into a 6 mm inner diameter quartz tube, secured with quartz wool and wire mesh. The tube was then placed in a tube furnace, and the actual reaction temperature was controlled by controlling the furnace's heating temperature. The inlet gas composition consisted of NO (800 ppm), NH3 (800 ppm), O2 (10 vol.%), chlorobenzene (400 ppm), SO2 (200 ppm), H2O (5 vol.%), and the remainder was N2. The total gas flow rate was 500 mL / min, and the temperature was controlled between 120 and 240°C, with 30-minute dwell times at 30°C intervals. Chlorobenzene concentration was measured by gas chromatography, and NO concentration was measured by flue gas analyzer. Both chlorobenzene removal and denitrification efficiencies of the catalyst were above 90% within the temperature range of 150-210°C.

Claims

1. A method for preparing an external field-enhanced microfluidic ellipsoidal denitration and dechlorobenzene catalyst, characterized by: The preparation method of the catalyst is as follows: (1) Preparation of active components by solvent thermal growth method Weighing cerium salt, niobium salt, iron salt, (R)-3-hydroxypyrrolidine hydrochloride, sodium thiosulfate, and deionized water, mixing them evenly, placing them in a hydrothermal reactor for hydrothermal reaction, filtering and drying after the reaction, and then placing them in a muffle furnace for low-temperature calcination to obtain a mixed powder of the active component and the morphology control agent; (2) Preparation of polyacrylonitrile nanofibers by external field enhanced microfluidic spinning Weigh polyacrylonitrile and ethyl acetate and add the mixed powder prepared in step (1) and mix evenly to form spinning solution A; weigh polyacrylonitrile and ethyl acetate and add titanium salt and mix evenly to form spinning solution B; connect two syringes to the dual channels of the microfluidic chip respectively; then use the dual channels of the microfluidic chip to respectively introduce spinning solution A and spinning solution B; add a relay coupling electromagnet at the tail end of the microfluidic chip; use the relay to control the electromagnet to form an intermittent magnetic field; finally, spin the mixed spinning solution through a microfluidic electrostatic integrated machine to obtain polyacrylonitrile nanofibers loaded with active components and morphology control agents; wherein the mass ratio of polyacrylonitrile, ethyl acetate and mixed powder is 1:(6~12):(0.5~1); the mass ratio of polyacrylonitrile, ethyl acetate and titanium salt is 1:(6~12):(1~2), and the titanium salt is tetrabutyl titanate or tetraethyl titanate; (3) Preparation of catalyst by calcination The polyacrylonitrile nanofibers prepared in step (2) are dried in an oven at high temperature to set the shape, and then placed in a muffle furnace and calcined at a rapid temperature to prepare an external field enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst; The catalyst uses titanium dioxide as a carrier, a composite oxide of cerium oxide and niobium oxide as an active component, ferrosoferric oxide as a morphology control agent, and a relay-coupled electromagnet as a morphology controller; it is prepared by a combined method of solvent thermal growth and external field enhanced microfluidic spinning; wherein, based on the mass of the carrier, the mass percentage of the active component is 10-20%, the mass percentage of the morphology control agent is 5-10%, and the mass ratio of cerium oxide to niobium oxide in the active component is 1:(0.5-2).

2. The preparation method according to claim 1, wherein: The cerium salt described in step (1) is cerium nitrate hexahydrate or cerium chloride, the niobium salt is niobium pentachloride, the iron salt is ferric nitrate nonahydrate or ferric chloride hexahydrate, and the mass ratio of the cerium salt, (R)-3-hydroxypyrrolidine hydrochloride, sodium thiosulfate, and deionized water is 1: (1-2): (3-4): (100-200).

3. The preparation method according to claim 1, wherein: The temperature of the hydrothermal reaction in step (1) is 140-180°C, the time of the hydrothermal reaction is 4-8 hours, the temperature of the drying is 80-100°C, the time of the drying is 6-12 hours, the temperature of the low-temperature roasting is 300-400°C, and the time of the low-temperature roasting is 2-4 hours.

4. The preparation method according to claim 1, wherein: The relay described in step (2) is a solid-state relay, which implements a cyclic instruction of energizing the electromagnet for 0.1 to 0.5 seconds and then de-energizing it for 5 to 10 seconds. The electromagnet is an iron wire with a diameter of 2 to 3 mm wound around a metal rod with a diameter of 10 to 20 cm.

5. The preparation method according to claim 1, wherein: The spinning voltage in step (2) is 15-25 kV, and the injection rate of the syringe is 0.5-1.5 mL / h.

6. The preparation method according to claim 1, wherein: The high-temperature drying temperature in step (3) is 100-130°C, the high-temperature drying time is 4-8 hours, the rapid heating rate is 10-20°C / min, the roasting temperature is 500-600°C, and the roasting time is 2-4 hours.

7. Use of the catalyst according to claim 1 in stationary source low-temperature denitration and dechlorobenzene.

8. Use of the catalyst according to claim 7 in stationary source low-temperature denitration and dechlorobenzene, characterized in that: The stationary sources specifically refer to coal-fired power plants, waste incineration, steel sintering, and dry cement industry.

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