Ellipsoidal rare-earth-based denitration and chlorobenzene removal catalyst as well as preparation method and application thereof

Abstract

The invention discloses a preparation method and application of an ellipsoidal rare-earth-based denitration and chlorobenzene removal catalyst. The catalyst takes nano ellipsoidal titanium dioxide as a carrier and takes a composite oxide of cerium oxide and cobalt oxide as an active component; on the basis of the mass of the carrier, the mass percentage of the active component is 10-20%. The catalyst synthesized by the method has the advantages of high low-temperature activity, large specific surface area, high active site exposure ratio and the like, and can realize the goal of denitration and chlorobenzene removal of complex flue gas in non-electric industries.

Description

Technical Field

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

[0002] The non-electricity industry needs to conduct research and development in the field of air pollution control in two directions:

[0003] (1) High-efficiency low-temperature catalysts. The flue gas temperature in the non-power industry is generally low. If medium- and high-temperature denitrification catalysts are used, the company needs to heat the flue gas, which increases additional costs. At low temperatures, the catalysts are easily poisoned and deactivated due to the complex composition of the flue gas in the non-power industry.

[0004] (2) Collaborative treatment of multiple pollutants. Single treatment of different components in flue gas will increase the cost of enterprise treatment. Collaborative treatment of multiple pollutants can not only integrate the treatment process of multiple pollutants into the same equipment or system, reducing the purchase, installation and maintenance costs of multiple equipment, but also reduce the generation of secondary pollutants, ensuring that the treatment process is more environmentally friendly.

[0005] At present, researchers have developed a series of simultaneous denitrification and dechlorobenzene technologies: (1) SCR and dechlorobenzene technology are combined to develop a new type of bifunctional catalyst that can simultaneously catalyze NO x For example, some metal oxides or noble metal catalysts react with NO under certain conditions. x It has good catalytic activity with chlorobenzene and can treat two pollutants simultaneously in the same reactor; (2) Activated carbon adsorption is combined with SCR. Activated carbon can adsorb chlorobenzene substances, while SCR technology can effectively remove NO x By combining these two technologies, multiple pollutants can be treated simultaneously in one system, especially when treating industrial emissions with high temperature and high concentration of gases. (3) Photocatalytic technology, by using ultraviolet light to irradiate the catalyst, can simultaneously activate NO x and chlorobenzene degradation reactions. Studies have shown that certain photocatalysts (such as TiO 2 ) can effectively decompose NO under ultraviolet light x and chlorobenzene, achieving a synergistic removal effect. The advantages of photocatalytic technology are that it is simple to operate, environmentally friendly, and can be carried out at room temperature and pressure, but the challenges it faces are the stability and cost of the catalyst; (4) Wet scrubbing and adsorption combined technology, the combination of wet scrubbing and adsorption is also an effective synergistic treatment method. Wet scrubbing can effectively remove NO in the gas. x , and the adsorption method can be used to treat chlorobenzene substances. By adjusting the pH value of the washing liquid, the selection of the adsorbent and the conditions of use, NO xand chlorobenzene.

[0006] Among the above-mentioned technologies, the development of new bifunctional catalysts is the technology with the most cost and technical advantages, mainly because the non-electric industry currently generally uses SCR technology for denitrification. Therefore, the development and application of bifunctional catalysts do not require companies to modify related equipment, but only need to replace related catalysts. Therefore, the development of low-cost, non-toxic and efficient new denitrification and dechlorobenzene catalysts is of great significance, especially when dealing with complex flue gas conditions in the non-electric industry. Summary of the invention

[0007] The purpose of the present invention is to propose an ellipsoidal rare earth-based denitration and dechlorobenzene catalyst and its preparation method and application in view of the current status and existing problems of simultaneous denitration and dechlorobenzene in the existing non-electricity industry.

[0008] An ellipsoidal rare earth-based denitration and dechlorobenzene catalyst, characterized in that: the catalyst uses nano-ellipsoidal titanium dioxide as a carrier, a composite oxide of cerium oxide and cobalt oxide as an active component, and is prepared by a microfluidic interface confined assembly-flame spray pyrolysis combined method; wherein, based on the mass of the carrier, the mass percentage of the active component is 10-20%, and the mass ratio of cerium oxide to cobalt oxide in the active component is 1:(0.1-0.4).

[0009] The preparation method of the catalyst is as follows:

[0010] (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method

[0011] Titanium salt and isopropanol are weighed and mixed evenly to form a microfluidic stock solution A, and a surfactant, isopropanol and deionized water are mixed evenly to form a microfluidic stock solution B, and then two syringes are respectively connected to the double channels of the Y-type microfluidic chip, and the microfluidic stock solution A and the microfluidic stock solution B are respectively introduced through the double channels of the Y-type microfluidic chip, and then the droplets after the reaction are collected by a microfluidic electrostatic integrated machine, and then dried and high-temperature calcined to obtain nano-ellipsoidal titanium dioxide powder;

[0012] (2) Preparation of catalyst by flame spray pyrolysis

[0013] Anhydrous ethanol is weighed and placed in a stainless steel beaker for later use; cerium salt, cobalt salt, deionized water, ethanol, and the nano-ellipsoidal titanium dioxide powder obtained in step (1) are weighed and mixed evenly to obtain a mixed solution, which is placed in an ultrasonic humidifier; the anhydrous ethanol in the stainless steel beaker is ignited to generate a flame, and the mixed solution is atomized by the ultrasonic humidifier, the atomization port of the ultrasonic humidifier is aligned with the stainless steel beaker, the atomized mixed solution is flame-roasted and rapidly pyrolyzed, and finally the pyrolyzed catalyst powder is filtered and collected to obtain a nano-ellipsoidal rare earth-based denitration and dechlorobenzene catalyst.

[0014] In the technical solution of the present invention: the titanium salt described in step (1) is tetrabutyl titanate or tetraethyl titanate, and the mass ratio of the titanium salt to isopropanol is 1:(10-20).

[0015] In the technical solution of the present invention: the surfactant described in step (1) is hexadecyltrimethylammonium bromide, and the mass ratio of the surfactant, isopropanol and deionized water is 1:(3-5):(20-40).

[0016] In the technical solution of the present invention: the injection rates of the two syringes described in step (1) are both 1-3 mL / h, and the voltage applied by the microfluidic electrostatic integrated machine when the stock solution is passed into the Y-shaped microfluidic chip is 15-25 kV.

[0017] In the technical solution of the present invention: the drying temperature in step (1) is 80-100° C., the drying time is 4-8 hours, the high-temperature roasting temperature is 500-700° C., and the high-temperature roasting time is 2-4 hours.

[0018] In the technical scheme of the present invention: the volume of the stainless steel beaker described in step (2) is 500-700 mL, the amount of anhydrous ethanol added to the stainless steel beaker is 200-400 mL, the cerium salt is hexahydrated cerium nitrate or cerium chloride, the cobalt salt is cobalt nitrate or cobalt chloride, and the mass ratio of the cerium salt, deionized water, and ethanol is 1:(20-40):(60-80).

[0019] In the technical solution of the present invention: the atomization power of the ultrasonic humidifier in step (2) is 10 to 30W.

[0020] In the technical solution of the present invention: the above catalyst is used in the denitration and dechlorobenzene removal of complex flue gas in non-electricity industries.

[0021] In the technical solution of the present invention: the above-mentioned non-electricity industry specifically refers to steel sintering, dry cement and chemical industries.

[0022] The experimental conditions for evaluating the activity of the catalyst of the present invention are as follows: 1 mL of a 20-40 mesh catalyst is poured into a quartz tube with an inner diameter of 6 mm, fixed with quartz wool and wire mesh, and the quartz tube is placed in a tube furnace. The actual temperature of the catalytic reaction is adjusted by controlling the heating temperature of the tube furnace. Intake gas components: NO (500 ppm), NH 3 (500ppm), O 2 (11 vol.%), chlorobenzene (400 ppm), SO 2 (200ppm), the rest are N 2The total gas flow rate was 500 mL / min, the temperature was controlled at 120-240°C, and it stayed stable for 30 min every 30°C. The chlorobenzene concentration was determined by gas chromatography, and the NO concentration was determined by flue gas analyzer. In the temperature range of 150-240°C, the catalyst dechlorobenzene efficiency and denitrification efficiency were both higher than 90%.

[0023] Beneficial effects:

[0024] (1) The present invention utilizes a microfluidic interface confined assembly method to prepare a nano-ellipsoidal titanium dioxide carrier. The ellipsoidal nanostructure not only has a large specific surface area, but also allows the carrier surface to contact more reactants, which helps to improve the efficiency and rate of the catalytic reaction. In addition, compared with conventional spherical or other morphological carriers, the nano-titanium dioxide with an ellipsoidal structure has a more uniform microscopic surface energy distribution, which makes it more stable and helps to extend the service life of the catalyst in practical applications. In addition, the nano-ellipsoidal structure can improve the distribution of active sites in the catalytic reaction, which is beneficial to the migration of electrons and ions, thereby promoting the reaction rate and enhancing the low-temperature catalytic effect of the catalyst. Finally, the present invention utilizes a microfluidic interface confined assembly method to prepare the carrier, which can continuously prepare the carrier and has a simple process, thereby avoiding the problem that the conventional solvent thermal method cannot be continuously produced.

[0025] (2) The present invention uses a simplified flame spray pyrolysis method to prepare the catalyst. The atomized precursor undergoes rapid pyrolysis, gasification and condensation in a high-temperature flame, and finally forms solid particles of nanometer size. This can not only improve production efficiency by taking advantage of the rapid reaction, but also enable the active components to be uniformly loaded on the surface of the carrier to form a core-shell structure, thereby avoiding the problem of active component agglomeration in the impregnation method or the change of the microscopic morphology of the carrier in the solvothermal method. At the same time, the simplified flame spray pyrolysis method of the present invention is simple to operate and does not require the use of complex and expensive equipment in the conventional flame spray pyrolysis method, and is more suitable for large-scale industrial production;

[0026] (3) The present invention uses titanium dioxide as a carrier and a composite oxide of cerium oxide and cobalt oxide as an active component, which can utilize the high specific surface area of ​​titanium dioxide and the excellent redox performance of cerium oxide and cobalt oxide. At the same time, cerium oxide and cobalt oxide can form a solid solution to further increase the oxygen vacancies of the catalyst, and titanium dioxide and cerium oxide can form a solid acid to increase the surface acidity of the catalyst, thereby ultimately ensuring the low-temperature catalytic reduction of NO by the catalyst. x and the properties of chlorobenzene oxide;

[0027] Therefore, the catalyst prepared by the present invention not only has excellent low-temperature denitration and dechlorobenzene performance, but also 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

[0028] Figure 1 This is the SEM image of the catalyst prepared in Example 1;

[0029] Figure 2 The denitration efficiency diagram of the catalyst prepared in Examples 1-3 and Comparative Example 1;

[0030] Figure 3 This is a graph showing the dechlorobenzene efficiency of the catalysts prepared in Examples 1-3 and Comparative Example 1. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with examples. The examples are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating processes are given, but the protection scope of the present invention is not limited to the following examples.

[0032] Example 1

[0033] (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method

[0034] Weigh 10g of tetrabutyl titanate and 200g of isopropanol and mix them evenly to form a microfluidic stock solution A, 3g of hexadecyltrimethylammonium bromide, 9g of isopropanol, and 60g of deionized water and mix them evenly to form a microfluidic stock solution B, then connect two syringes to the dual channels of the Y-type microfluidic chip respectively, use the dual channels of the Y-type microfluidic chip to respectively introduce microfluidic stock solution A and microfluidic stock solution B (the injection rate of the two syringes is 1mL / h), and then collect the droplets after the reaction through a microfluidic electrostatic integrated machine (the applied voltage is 15kV), dry at 80°C for 8h, and then calcine at 500°C for 4h to obtain nano-ellipsoidal titanium dioxide powder;

[0035] (2) Preparation of catalyst by flame spray pyrolysis

[0036] 200 mL of anhydrous ethanol was weighed and placed in a 500 mL stainless steel beaker for later use. 0.459 g of cerium nitrate hexahydrate, 0.044 g of cobalt nitrate, 9.180 g of deionized water, 27.540 g of ethanol, and 2 g of the nano-ellipsoidal titanium dioxide powder obtained in step (1) were weighed and mixed evenly to obtain a mixed solution, which was placed in an ultrasonic humidifier. The anhydrous ethanol in the stainless steel beaker was ignited to generate a flame, and the mixed solution was atomized using an ultrasonic humidifier (the atomization power was 10 W). The atomization port of the ultrasonic humidifier was aligned with the stainless steel beaker, and the atomized mixed solution was flame-roasted and rapidly pyrolyzed. Finally, the pyrolyzed catalyst powder was filtered and collected to obtain a nano-ellipsoidal rare earth-based denitration and dechlorobenzene catalyst (based on the carrier mass, the mass percentage of the active component was 10%, the mass ratio of cerium oxide to cobalt oxide in the active component was 1:0.1, and the SEM image of the catalyst was as shown in FIG. Figure 1 shown);

[0037] (3) Catalytic activity test

[0038] Take 1 mL of 20-40 mesh catalyst, pour it into a quartz tube with an inner diameter of 6 mm, fix it with quartz wool and wire mesh, put the quartz tube in a tube furnace, and adjust the actual temperature of the catalytic reaction by controlling the heating temperature of the tube furnace. Intake components: NO (500ppm), NH 3 (500ppm), O 2 (11 vol.%), chlorobenzene (400 ppm), SO 2 (200ppm), the rest are N 2 The total gas flow rate was 500 mL / min, the temperature was controlled at 120-240°C, and it stayed stable for 30 min every 30°C. The chlorobenzene concentration was determined by gas chromatography, and the NO concentration was determined by flue gas analyzer. In the temperature range of 150-240°C, the catalyst dechlorobenzene efficiency and denitrification efficiency were both higher than 90%.

[0039] Example 2

[0040] (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method

[0041] Weigh 10g of tetrabutyl titanate and 150g of isopropanol and mix them evenly to form a microfluidic stock solution A, 3g of hexadecyltrimethylammonium bromide, 12g of isopropanol, and 90g of deionized water and mix them evenly to form a microfluidic stock solution B, then connect two syringes to the dual channels of the Y-type microfluidic chip respectively, use the dual channels of the Y-type microfluidic chip to respectively introduce microfluidic stock solution A and microfluidic stock solution B (the injection rate of the two syringes is 2mL / h), and then collect the droplets after the reaction through a microfluidic electrostatic integrated machine (the applied voltage is 20kV), dry at 90°C for 6h, and then calcine at 600°C for 3h to obtain nano-ellipsoidal titanium dioxide powder;

[0042] (2) Preparation of catalyst by flame spray pyrolysis

[0043] Weigh 300 mL of anhydrous ethanol and place it in a 600 mL stainless steel beaker for later use, weigh 0.584 g of cerium nitrate hexahydrate, 0.087 g of cobalt chloride, 17.520 g of deionized water, 40.880 g of ethanol, and 2 g of the nano-ellipsoidal titanium dioxide powder obtained in step (1), mix them evenly to obtain a mixed solution, and place it in an ultrasonic humidifier, then ignite the anhydrous ethanol in the stainless steel beaker to generate a flame, and use the ultrasonic humidifier to atomize the mixed solution (the atomization power is 20 W), and the atomization port of the ultrasonic humidifier is aimed at the stainless steel beaker, so that the atomized mixed solution is flame-roasted and rapidly pyrolyzed, and finally filter and collect the pyrolyzed catalyst powder to obtain a nano-ellipsoidal rare earth-based denitration and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component is 15%, and the mass ratio of cerium oxide to cobalt oxide in the active component is 1:0.2);

[0044] (3) Catalytic activity test

[0045] Take 1 mL of 20-40 mesh catalyst, pour it into a quartz tube with an inner diameter of 6 mm, fix it with quartz wool and wire mesh, put the quartz tube in a tube furnace, and adjust the actual temperature of the catalytic reaction by controlling the heating temperature of the tube furnace. Intake components: NO (500ppm), NH 3 (500ppm), O 2 (11 vol.%), chlorobenzene (400 ppm), SO 2 (200ppm), the rest are N 2 The total gas flow rate was 500 mL / min, the temperature was controlled at 120-240°C, and it stayed stable for 30 min every 30°C. The chlorobenzene concentration was determined by gas chromatography, and the NO concentration was determined by flue gas analyzer. In the temperature range of 150-240°C, the catalyst dechlorobenzene efficiency and denitrification efficiency were both higher than 90%.

[0046] Example 3

[0047] (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method

[0048] Weigh 10g of tetrabutyl titanate and 100g of isopropanol and mix them evenly to form a microfluidic stock solution A, 3g of hexadecyltrimethylammonium bromide, 15g of isopropanol, and 120g of deionized water and mix them evenly to form a microfluidic stock solution B, then connect two syringes to the dual channels of the Y-type microfluidic chip respectively, use the dual channels of the Y-type microfluidic chip to respectively introduce microfluidic stock solution A and microfluidic stock solution B (the injection rate of the two syringes is 3mL / h), and then collect the droplets after the reaction through a microfluidic electrostatic integrated machine (the applied voltage is 25kV), dry at 100°C for 4h, and then calcine at 700°C for 2h to obtain nano-ellipsoidal titanium dioxide powder;

[0049] (2) Preparation of catalyst by flame spray pyrolysis

[0050] Weigh 400 mL of anhydrous ethanol and place it in a 700 mL stainless steel beaker for later use, weigh 0.410 g of cerium chloride, 0.198 g of cobalt chloride, 16.400 g of deionized water, 32.800 g of ethanol, and 2 g of the nano-ellipsoidal titanium dioxide powder obtained in step (1), mix them evenly to obtain a mixed solution, and place it in an ultrasonic humidifier, then ignite the anhydrous ethanol in the stainless steel beaker to generate a flame, and use the ultrasonic humidifier to atomize the mixed solution (the atomization power is 30 W), and the atomization port of the ultrasonic humidifier is aimed at the stainless steel beaker, so that the atomized mixed solution is flame-roasted and rapidly pyrolyzed, and finally filter and collect the pyrolyzed catalyst powder to obtain a nano-ellipsoidal rare earth-based denitration and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component is 20%, and the mass ratio of cerium oxide to cobalt oxide in the active component is 1:0.4);

[0051] (3) Catalytic activity test

[0052] Take 1 mL of 20-40 mesh catalyst, pour it into a quartz tube with an inner diameter of 6 mm, fix it with quartz wool and wire mesh, put the quartz tube in a tube furnace, and adjust the actual temperature of the catalytic reaction by controlling the heating temperature of the tube furnace. Intake components: NO (500ppm), NH 3 (500ppm), O 2 (11 vol.%), chlorobenzene (400 ppm), SO 2 (200ppm), the rest are N 2 The total gas flow rate was 500 mL / min, the temperature was controlled at 120-240°C, and it stayed stable for 30 min every 30°C. The chlorobenzene concentration was determined by gas chromatography, and the NO concentration was determined by flue gas analyzer. In the temperature range of 150-240°C, the catalyst dechlorobenzene efficiency and denitrification efficiency were both higher than 90%.

[0053] Comparative Example 1

[0054] (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method

[0055] Weigh 10g of tetrabutyl titanate and 150g of isopropanol and mix them evenly to form a microfluidic stock solution A, 3g of hexadecyltrimethylammonium bromide, 12g of isopropanol, and 90g of deionized water and mix them evenly to form a microfluidic stock solution B, then connect two syringes to the dual channels of the Y-type microfluidic chip respectively, use the dual channels of the Y-type microfluidic chip to respectively introduce microfluidic stock solution A and microfluidic stock solution B (the injection rate of the two syringes is 2mL / h), and then collect the droplets after the reaction through a microfluidic electrostatic integrated machine (the applied voltage is 20kV), dry at 90°C for 6h, and then calcine at 600°C for 3h to obtain nano-ellipsoidal titanium dioxide powder;

[0056] (2) Preparation of catalyst by impregnation and calcination method

[0057] Weigh 0.584 g of cerium nitrate hexahydrate, 0.087 g of cobalt chloride, 17.520 g of deionized water, 40.880 g of ethanol, and 2 g of the nano-ellipsoidal titanium dioxide powder obtained in step (1), mix them evenly to obtain a mixed solution, then place them in an oven to dry at 60° C. and calcine them at 500° C. for 2 h to obtain a rare earth-based denitration and dechlorobenzene catalyst (based on the mass of the carrier, the mass percentage of the active component is 15%, and the mass ratio of cerium oxide to cobalt oxide in the active component is 1:0.2);

[0058] (3) Catalytic activity test

[0059] Take 1 mL of 20-40 mesh catalyst, pour it into a quartz tube with an inner diameter of 6 mm, fix it with quartz wool and wire mesh, put the quartz tube in a tube furnace, and adjust the actual temperature of the catalytic reaction by controlling the heating temperature of the tube furnace. Intake components: NO (500ppm), NH 3 (500ppm), O 2 (11 vol.%), chlorobenzene (400 ppm), SO 2 (200ppm), the rest are N 2 The total gas flow rate was 500 mL / min, the temperature was controlled at 120-240°C, and the temperature was kept stable for 30 min at every 30°C. The chlorobenzene concentration was determined by gas chromatography, and the NO concentration was determined by flue gas analyzer. The denitrification efficiency at 150°C was 61.8%, and the dechlorobenzene efficiency was 19.8%;

[0060] (4) Contrast effect

[0061] Compared with Example 1, the catalyst is prepared by conventional impregnation and calcination instead of flame spray pyrolysis. The active components may agglomerate on the carrier surface, resulting in the inability to form a core-shell nano-ellipsoidal core-shell structure, which leads to a significant decrease in its catalytic activity.

Claims

1. An ellipsoidal rare earth-based denitration and dechlorobenzene catalyst, characterized in that: The catalyst uses nano-ellipsoidal titanium dioxide as a carrier and a composite oxide of cerium oxide and cobalt oxide as an active component, and is prepared by a combined method of microfluidic interface confined assembly and flame spray pyrolysis; wherein, based on the mass of the carrier, the mass percentage of the active component is 10-20%, and the mass ratio of cerium oxide to cobalt oxide in the active component is 1:(0.1-0.4).

2. A method for preparing the catalyst according to claim 1, characterized in that: The preparation method of the catalyst is as follows: (1) Preparation of nano-ellipsoidal titanium dioxide by microfluidic interface confined assembly method Titanium salt and isopropanol are weighed and mixed evenly to form a microfluidic stock solution A, and a surfactant, isopropanol and deionized water are mixed evenly to form a microfluidic stock solution B, and then two syringes are respectively connected to the double channels of the Y-type microfluidic chip, and the microfluidic stock solution A and the microfluidic stock solution B are respectively introduced through the double channels of the Y-type microfluidic chip, and then the droplets after the reaction are collected by a microfluidic electrostatic integrated machine, and then dried and high-temperature calcined to obtain nano-ellipsoidal titanium dioxide powder; (2) Preparation of catalyst by flame spray pyrolysis Anhydrous ethanol is placed in a container for later use; cerium salt, cobalt salt, deionized water, ethanol, and the nano-ellipsoidal titanium dioxide powder prepared in step (1) are mixed evenly to prepare a mixed solution, and the mixed solution is placed in an ultrasonic humidifier; the anhydrous ethanol in a stainless steel beaker is ignited to generate a flame, and the mixed solution is atomized by the ultrasonic humidifier, the atomizing port of the ultrasonic humidifier is aligned with the stainless steel beaker, the atomized mixed solution is flame-roasted and rapidly pyrolyzed, and finally the pyrolyzed catalyst powder is filtered and collected to prepare a nano-ellipsoidal rare earth-based denitration and dechlorobenzene catalyst.

3. The preparation method according to claim 1, characterized in that: The titanium salt described in step (1) is tetrabutyl titanate or tetraethyl titanate, and the mass ratio of the titanium salt to isopropanol is 1:(10-20).

4. The preparation method according to claim 2, characterized in that: The surfactant described in step (1) is hexadecyltrimethylammonium bromide, and the mass ratio of the surfactant, isopropanol and deionized water is 1:(3-5):(20-40).

5. The preparation method according to claim 1, characterized in that: The injection rates of the two syringes described in step (1) are both 1-3 mL / h, and the voltage applied by the microfluidic electrostatic integrated machine when the stock solution is passed into the Y-shaped microfluidic chip is 15-25 kV.

6. The preparation method according to claim 2, characterized in that: The drying temperature in step (1) is 80-100° C., the drying time is 4-8 hours, the high-temperature roasting temperature is 500-700° C., and the high-temperature roasting time is 2-4 hours.

7. The preparation method according to claim 2, characterized in that: In step (2), the cerium salt is cerium nitrate hexahydrate or cerium chloride, the cobalt salt is cobalt nitrate or cobalt chloride, and the mass ratio of the cerium salt, deionized water and ethanol is 1: (20-40): (60-80).

8. The preparation method according to claim 2, characterized in that: The atomization power of the ultrasonic humidifier in step (2) is 10 to 30 W.

9. Application of the catalyst according to claim 1 in denitration and dechlorobenzene removal of complex flue gas in non-power industries.

10. The non-electricity industry described in claim 9 specifically refers to steel sintering, dry cement and chemical industries.

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