Dust removal and denitration multifunctional filter material with rod-shaped catalytic interface, preparation method and application

Abstract

The present application belongs to the technical field of functional composite filter material, and particularly relates to a dust and denitration multifunctional filter material with rod-shaped catalytic interface, a preparation method and application; the dust and denitration filter material is prepared from active stock solution and filter material substrate; the active stock solution comprises, by mass percentage, 10-20% of active component precursor, and 6-12% of morphology additive; the active component precursor comprises manganese salt, tin salt, cerium salt and niobium salt, and the molar ratio of Mn / Sn / Ce / Nb elements in the active component precursor is 1:(0.1-0.5):(0.9-1.8):(0.5-1); the morphology additive comprises iron salt, cobalt salt, molybdenum salt and nitrogen salt, and the molar ratio of Fe / Co / N / Mo elements in the morphology additive is 1:(0.1-1):(0.5-1):(0.1-0.5). The dust and denitration filter material has excellent SO2 resistance and high humidity (flue gas moisture content > 15%) resistance; and without modification of any equipment, the dust and NO x x can be simultaneously removed in the dust collector during use; the present application has important significance for popularization and application of the gas coordinated dust and denitration technology in the steel manufacturing industry.

Description

Technical Field

[0001] This invention belongs to the field of functional composite filter material technology, specifically relating to a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface, its preparation method, and its application. Background Technology

[0002] Coal, as my country's primary energy source now and in the future, is a crucial fuel for the steel manufacturing and power generation industries. However, coal combustion produces large amounts of nitrogen oxides and dust, which, if directly released into the air, will cause serious environmental damage. The steel industry, as the fourth largest source of nitrogen oxide emissions after thermal power generation, motor vehicles, and the cement industry, generates large amounts of sintering flue gas during its essential sintering process. This flue gas contains significant amounts of nitrogen oxides, dust, water vapor, and sulfur dioxide, among other pollutants. Dust easily clogs the pores of SCR catalysts, while water vapor and SO2 easily poison and deactivate them, thus reducing catalyst activity and severely shortening their lifespan. These factors make it difficult for the steel industry to apply existing commercial SCR denitrification technologies, and currently, highly efficient denitrification technologies are still lacking.

[0003] Dual-function filter media for dust removal and denitrification can utilize existing dust collectors as denitrification reactors, eliminating the need for new denitrification equipment. However, there are currently few technologies specifically designed for the steel industry to apply this type of filter media. Among domestic patents related to dual-function filter media for dust removal and denitrification, patent (CN104941319A) describes preparing a manganese oxide suspension from powder and then loading the manganese oxide onto pretreated viscous filter media using an impregnation method to obtain the dual-function filter media for dust removal and denitrification. Patent (CN105315000A) uses a TiO2-ZrO2-CeO2 composite oxide as the active component and similarly employs an impregnation method to load it onto ceramic filter media to obtain the dual-function filter media for dust removal and denitrification. The aforementioned patents all employ an impregnation method to load the active components onto the filter media. However, this method can lead to uneven loading, instability, and easy detachment of the active components. Furthermore, neither the active components nor the filter media have undergone any improvements in their resistance to sulfur and high humidity, which can result in the catalyst's active components being easily poisoned and deactivated. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a multifunctional dust removal and denitrification filter media with a rod-shaped catalytic interface, its preparation method, and its application. This filter media consists of a filter media substrate and a rod-shaped catalytic interface wrapped around the surface of the substrate. The rod-shaped catalytic interface allows for a tighter bond with the filter media fibers and exhibits excellent resistance to SO2 and high humidity (flue gas moisture content > 15%). This filter media requires no equipment modification during use and can simultaneously remove dust and NO in a dust collector. xWithin the temperature range of 140-200℃, the denitrification rate is >95%. This invention is of great significance for the promotion and application of gas-assisted dust removal and denitrification technology in the steel manufacturing industry.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface, wherein the raw materials for preparing the multifunctional filter material include an active raw liquid and a filter material substrate;

[0007] The active stock solution comprises, by mass percentage:

[0008] 10-20% of the active ingredient precursor;

[0009] Morphology aids 6-12%;

[0010] The active component precursor includes manganese salt, tin salt, cerium salt and niobium salt, and the molar ratio of Mn / Sn / Ce / Nb elements in the active component precursor is 1:(0.1-0.5):(0.9-1.8):(0.5-1); the morphology aid includes iron salt, cobalt salt, molybdenum salt and nitrogen salt, and the molar ratio of Fe / Co / N / Mo elements in the morphology aid is 1:(0.1-1):(0.5-1):(0.1-0.5).

[0011] Preferably, the manganese salt is at least one of manganese nitrate and manganese chloride, the niobium salt is niobium oxalate, the cerium salt is at least one of cerium nitrate and cerium chloride, and the tin salt is tin tetrachloride.

[0012] Preferably, the iron salt is ferric nitrate, the molybdenum salt is molybdenum sulfate, the cobalt salt is at least one of cobalt nitrate and cobalt acetate, and the nitrogen salt is at least one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide.

[0013] Preferably, the filter media substrate is one of PPS fiber filter media, PE filter media, glass fiber filter media or P84 filter media.

[0014] Preferably, the active stock solution further comprises, by mass percentage:

[0015]

[0016]

[0017] Preferably, the activator is one of sodium carbonate, potassium hydroxide, or ammonia water; the dispersant is at least one of fatty alcohol polyoxyethylene ether and sodium dinaphthylmethane disulfonate; and the coupling agent is one of vinyltris(β-methoxyethoxy)silane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and γ-aminopropylmethyldiethoxysilane.

[0018] A method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface, the method comprising the following steps:

[0019] (1) Preparation of active stock solution

[0020] The active component precursor, morphology aid, dispersant, coupling agent and activator are added to deionized water and magnetically stirred at 20-40℃ with a stirring speed of 150-260 rpm to completely dissolve all components in deionized water to obtain the active stock solution.

[0021] (2) In-situ growth of catalytic interface

[0022] First, the filter media substrate is immersed in the active stock solution and continuously agitated to pretreat the filter media substrate. Then, the pretreated filter media substrate and the active stock solution are transferred together into a reaction vessel, where the filter media substrate and the active stock solution undergo a hydrothermal reaction. This results in the in-situ generation of active components with rod-shaped catalytic interfaces on the surface of the filter media substrate, and the active components with rod-shaped catalytic interfaces are coated on the surface of the filter media substrate fibers.

[0023] (3) Solidification and shaping of rod-shaped catalytic interface

[0024] Take out the filter material substrate obtained in step (2), soak and wash it with a curing agent at least 3 times to solidify and shape the rod-shaped catalytic interface; then soak and wash it with deionized water at least 3 times to remove the residual curing agent; finally, dry it to obtain a multifunctional filter material with rod-shaped catalytic interface for dust removal and denitrification.

[0025] Preferably, in step (2), when the filter substrate and the active stock solution are transferred together into the reactor for reaction, the reactor needs to be fixed on the rotating support of the reactor; and the reaction temperature in the reactor is set to 90-150°C, the reaction time is 20-28 hours, and the rotation speed of the rotating support is 200-400 rpm.

[0026] In step (3), the drying equipment used is a forced-air drying oven. The drying conditions are: first dry at 60-100℃ for 50-100 minutes, then raise the temperature to 101-290℃ and dry for 50-300 minutes.

[0027] Preferably, the curing agent is one of anhydrous ethanol or isopropanol.

[0028] Preferably, the multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface is used in the adsorption of flue gas in the steel manufacturing industry.

[0029] The beneficial effects of this invention are:

[0030] (1) In the multifunctional filter material for dust removal and denitrification with rod-shaped catalytic interface provided by the present invention, the catalytic interface with rod shape is tightly bonded to the filter material fiber and has excellent SO2 resistance and high humidity resistance, which can effectively extend the service life of the filter material.

[0031] (2) Using the rod-shaped catalytic interface dust removal and denitrification multifunctional filter material provided by the present invention, the denitrification rate is >95% and the dust removal rate is >99% within the temperature range of 140-200℃;

[0032] (3) The preparation method of the present invention is simple and has high production feasibility;

[0033] (4) This invention is of great significance for the promotion and application of synergistic dust removal and denitrification technology in the steel industry. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0035] Figure 1 These are SEM images of the finished product of the multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface proposed in this invention at different scales. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] 1. Preparation of active stock solution

[0039] Weigh 10g (10%) of the active component precursor, 12g (12%) of the morphology aid, 1g (1%) of the dispersant, 0.5g (0.5%) of the coupling agent, 21g (21%) of the activator, and 55.5g (55.5%) of the deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.1:1.8:1 and Fe / Co / N / Mo being 1:0.1:1:0.1, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt nitrate, 1-methyl-2-pyrrolidone, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, the coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and the activator ammonia were weighed and added to the deionized water. The mixture was then subjected to constant temperature magnetic stirring at 40°C and a stirring speed of 150 rpm to ensure complete dissolution.

[0040] 2. In-situ growth at the catalytic interface

[0041] Immerse the PE dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 40°C for 100 minutes while continuously stirring at a speed of 600 rpm. Transfer the treated dust collector filter material and activated stock solution together into a reactor, and fix the reactor on a rotating support of the reactor. The reaction time is 20 hours, the reaction temperature is 150°C, and the rotation speed of the rotating support is 400 rpm.

[0042] 3. Rod-shaped catalyst interface solidification and shaping

[0043] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent isopropanol, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 60℃ for 75 minutes, and then at 101℃ for 175 minutes, thus obtaining a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0044] NO x Removal efficiency and dust removal efficiency:

[0045] sample reaction temperature Denitrification rate Sulfur resistance, water resistance, and denitrification rate Dust removal efficiency Example 1 200℃ 96％ 90％ 99％

[0046] NO x The removal efficiency test method is as follows:

[0047] The experimental setup consists of a gas distribution system, flow control (mass flow meter), gas mixer, gas preheater, catalytic reactor, and flue gas analysis system. Filter media is installed in the reactor, which is then placed in a fixed tubular furnace reactor. The simulated flue gas composition is: NO (600 ppm), NH3 (600 ppm), O2 (8%), and carrier gas N2. The filtration velocity is 1 m / min, and the reaction temperature is controlled at 200℃. The flow rates of each gas are controlled by the mass flow meter. Before entering the reactor, the gas is mixed in the gas mixer and then heated by the heater. The NO flow rates at the inlet and outlet are... x Concentrations were measured using a KM9106 (Kane) flue gas analyzer. To eliminate the influence of surface adsorption, data collection and testing began 20–30 minutes after the system had been running stably.

[0048] The catalytic activity of the catalyst is determined by NO x The denitrification activity is reflected by C0, which represents the intake NO. x The concentration of NO in the gaseous gas, c represents the concentration of NO in the gaseous gas. x Concentration, NO x The removal rate is calculated by the following formula:

[0049] Denitrification rate = [(c0-c) / c0] × 100%

[0050] When conducting SO2 and high humidity resistance tests, an additional 600ppm SO2 and 15% water vapor (H2O enters the preheater via a horizontal flow pump) need to be introduced during air intake. After 24 hours of air intake, the denitrification rate is tested.

[0051] The test method for flue gas dust removal efficiency is as follows:

[0052] The filtration performance of the samples was tested using a VDI filter media simulation testing device, with Pural NF alumina dust selected at a concentration of 5 g / m³. 3 Filtration velocity 2 m / min, dust removal pressure difference 1000 Pa, test area 0.0154 m² 2 The pulse jet interval is 5s, the tank pressure is 0.5MPa, the humidity is <50%, and the pulse valve opening time is 60ms.

[0053] The dust removal rate is calculated by the following formula:

[0054]

[0055] Example 2

[0056] 1. Preparation of active stock solution

[0057] Weigh 20g (20%) of active component precursor, 6g (6%) of morphology aid, 0.6g (0.6%) of dispersant, 1g (1%) of coupling agent, 15g (15%) of activator, and 57.4g (57.4%) of deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.5:0.9:0.5 and Fe / Co / N / Mo being 1:0.1:0.5:0.5, the amounts of the active component precursors manganese chloride, cerium chloride, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt nitrate, 1-methyl-2-pyrrolidone, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, coupling agent γ-aminopropylmethyldiethoxysilane, and activator sodium carbonate were weighed and added to the deionized water. The mixture was then subjected to constant-temperature magnetic stirring at 20°C and a stirring speed of 260 rpm until completely dissolved.

[0058] 2. In-situ growth at the catalytic interface

[0059] The PPS dust collector filter material was immersed in the activated stock solution stirred in step 1, and ultrasonically vibrated at 30°C for 100 minutes with continuous stirring at a stirring speed of 200 rpm. The treated dust collector filter material and activated stock solution were then transferred into a reaction vessel, and the reaction vessel was fixed on a rotating support of the reactor. The reaction time was 28 hours, the reaction temperature was 90°C, and the rotation speed of the rotating support was 200 rpm.

[0060] 3. Rod-shaped catalyst interface solidification and shaping

[0061] Take out the dust removal filter material obtained in step 2, soak and wash it three times with anhydrous ethanol as a curing agent, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 60°C for 100 minutes, and then at 290°C for 50 minutes to obtain a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0062] NO x Removal efficiency and dust removal efficiency:

[0063] sample reaction temperature Denitrification rate Sulfur resistance, water resistance, and denitrification rate Dust removal efficiency Example 2 200℃ 97％ 90％ 99％

[0064] NO x The testing methods for removal efficiency and dust removal efficiency are the same as in Example 1.

[0065] Example 3

[0066] 1. Preparation of active stock solution

[0067] Weigh 15g (15%) of the active component precursor, 12g (12%) of the morphology aid, 0.3g (0.3%) of the dispersant, 1.9g (1.9%) of the coupling agent, 23g (23%) of the activator, and 47.8g (47.8%) of the deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.1:1.8:1 and Fe / Co / N / Mo being 1:0.1:1:0.1, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt nitrate, 1-methyl-2-pyrrolidone, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, the coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and the activator ammonia were weighed and added to the deionized water. The mixture was then subjected to constant temperature magnetic stirring at 40°C and a stirring speed of 200 rpm to ensure complete dissolution.

[0068] 2. In-situ growth at the catalytic interface

[0069] Immerse the fiberglass dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 50°C for 20 minutes while continuously stirring at a speed of 600 rpm. Transfer the treated dust collector filter material and activated stock solution together into a reactor and fix the reactor on a rotating support. The reaction time is 24 hours, the reaction temperature is 150°C, and the rotation speed of the rotating support is 300 rpm.

[0070] 3. Rod-shaped catalyst interface solidification and shaping

[0071] Take out the dust removal filter material obtained in step 2, soak and wash it three times with anhydrous ethanol as a curing agent, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 100℃ for 50 minutes, and then at 180℃ for 300 minutes to obtain a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0072] NO x Removal efficiency and dust removal efficiency:

[0073] sample reaction temperature Denitrification rate Sulfur resistance, water resistance, and denitrification rate Dust removal efficiency Example 3 200℃ 95％ 90％ 99％

[0074] NO x The testing methods for removal efficiency and dust removal efficiency are the same as in Example 1.

[0075] Example 4

[0076] 1. Preparation of active stock solution

[0077] Weigh 15g (15%) of the active component precursor, 9g (9%) of the morphology aid, 0.65g (0.65%) of the dispersant, 1.2g (1.2%) of the coupling agent, 19g (19%) of the activator, and 55.15g (55.15%) of the deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.3:1.35:0.75 and Fe / Co / N / Mo being 1:0.55:0.75:0.0.3, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt acetate, N,N-dimethylformamide, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, the coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and the activator ammonia were weighed and added to the deionized water. The mixture was then subjected to constant-temperature magnetic stirring at 30°C and a stirring speed of 210 rpm until completely dissolved.

[0078] 2. In-situ growth at the catalytic interface

[0079] The P84 dust collector filter material was immersed in the activated stock solution stirred in step 1, and ultrasonically vibrated at 40°C for 60 minutes with continuous stirring at a speed of 400 rpm. The treated dust collector filter material and activated stock solution were then transferred into a reaction vessel, and the reaction vessel was fixed on a rotating support of the reactor. The reaction time was 24 hours, the reaction temperature was 120°C, and the rotation speed of the rotating support was 300 rpm.

[0080] 3. Rod-shaped catalyst interface solidification and shaping

[0081] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent isopropanol, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 80℃ for 75 minutes, and then at 200℃ for 170 minutes, thus obtaining a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0082] NO x Removal efficiency and dust removal efficiency:

[0083]

[0084]

[0085] NO x The testing methods for removal efficiency and dust removal efficiency are the same as in Example 1.

[0086] Comparative Example 1

[0087] 1. Preparation of active stock solution

[0088] Weigh 12g (12%) of morphology aid, 0.3g (0.3%) of dispersant, 1.9g (1.9%) of coupling agent, 23g (23%) of activator, and 62.8g (62.8%) of deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.1:1.8:1 and Fe / Co / N / Mo being 1:0.1:1:0.1, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt nitrate, 1-methyl-2-pyrrolidone, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, the coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and the activator ammonia were weighed and added to the deionized water. The mixture was then subjected to constant temperature magnetic stirring at 40°C and a stirring speed of 200 rpm to ensure complete dissolution.

[0089] 2. In-situ growth at the catalytic interface

[0090] Immerse the fiberglass dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 50°C for 20 minutes while continuously stirring at a speed of 600 rpm. Transfer the treated dust collector filter material and activated stock solution together into a reactor and fix the reactor on a rotating support. The reaction time is 24 hours, the reaction temperature is 150°C, and the rotation speed of the rotating support is 300 rpm.

[0091] 3. Rod-shaped catalyst interface solidification and shaping

[0092] Take out the dust removal filter material obtained in step 2, soak and wash it three times with anhydrous ethanol as a curing agent, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 100℃ for 50 minutes, and then at 180℃ for 300 minutes to obtain a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0093] NO x Removal efficiency and dust removal efficiency:

[0094] sample reaction temperature Denitrification rate Sulfur resistance, water resistance, and denitrification rate Dust removal efficiency Comparative Example 1 200℃ 9％ 7％ 99％

[0095] NO x The testing methods for removal efficiency and dust removal efficiency are the same as in Example 1.

[0096] Comparative Example 2

[0097] 1. Preparation of active stock solution

[0098] Weigh 15g (15%) of the active component precursor, 0.3g (0.3%) of the dispersant, 1.9g (1.9%) of the coupling agent, 23g (23%) of the activator, and 59.8g (59.8%) of the deionized water. Based on the elemental molar ratios of Mn / Sn / Ce / Nb being 1:0.1:1.8:1 and Fe / Co / N / Mo being 1:0.1:1:0.1, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, and tin tetrachloride, as well as the morphology aids ferric nitrate, cobalt nitrate, 1-methyl-2-pyrrolidone, and molybdenum sulfate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant fatty alcohol polyoxyethylene ether, the coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and the activator ammonia were weighed and added to the deionized water. The mixture was then subjected to constant temperature magnetic stirring at 40°C and a stirring speed of 200 rpm to ensure complete dissolution.

[0099] 2. In-situ growth at the catalytic interface

[0100] Immerse the fiberglass dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 50°C for 20 minutes while continuously stirring at a speed of 600 rpm. Transfer the treated dust collector filter material and activated stock solution together into a reactor and fix the reactor on a rotating support. The reaction time is 24 hours, the reaction temperature is 150°C, and the rotation speed of the rotating support is 300 rpm.

[0101] 3. Rod-shaped catalyst interface solidification and shaping

[0102] Take out the dust removal filter material obtained in step 2, soak and wash it three times with anhydrous ethanol as a curing agent, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 100℃ for 50 minutes, and then at 180℃ for 300 minutes to obtain a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface.

[0103] NO x Removal efficiency and dust removal efficiency:

[0104] sample reaction temperature Denitrification rate Sulfur resistance, water resistance, and denitrification rate Dust removal efficiency Comparative Example 2 200℃ 81％ 65％ 99％

[0105] NO x The testing methods for removal efficiency and dust removal efficiency are the same as in Example 1.

[0106] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0107] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface, characterized in that: The raw materials for preparing the dust removal and denitrification multifunctional filter material include an active raw liquid and a filter material substrate; The active stock solution comprises, by mass percentage: 10-20% of the active ingredient precursor; Morphology aids 6-12%; The active component precursor includes manganese salt, tin salt, cerium salt, and niobium salt, and the molar ratio of Mn / Sn / Ce / Nb elements in the active component precursor is 1:(0.1-0.5):(0.9-1.8):(0.5-1); the morphology aid includes iron salt, cobalt salt, molybdenum salt, and nitrogen salt, and the molar ratio of Fe / Co / N / Mo elements in the morphology aid is 1:(0.1-1):(0.5-1):(0.1-0.5); The preparation method includes the following steps: (1) Preparation of active stock solution The active component precursor, morphology aid, dispersant, coupling agent and activator are added to deionized water and magnetically stirred at 20-40℃ with a stirring speed of 150-260 rpm to completely dissolve all components in deionized water to obtain the active stock solution. (2) In-situ growth of catalytic interface First, the filter media substrate is immersed in the active stock solution and continuously agitated to pretreat the filter media substrate. Then, the pretreated filter media substrate and the active stock solution are transferred together into a reaction vessel, where the filter media substrate and the active stock solution undergo a hydrothermal reaction. This results in the in-situ generation of active components with rod-shaped catalytic interfaces on the surface of the filter media substrate, and the active components with rod-shaped catalytic interfaces are coated on the surface of the filter media substrate fibers. (3) Solidification and shaping of rod-shaped catalytic interface Take out the filter material substrate obtained in step (2), soak and wash it with a curing agent at least 3 times to solidify and shape the rod-shaped catalytic interface; then soak and wash it with deionized water at least 3 times to remove the residual curing agent; finally, dry it to obtain a multifunctional filter material with rod-shaped catalytic interface for dust removal and denitrification.

2. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: The manganese salt is at least one of manganese nitrate and manganese chloride, the niobium salt is niobium oxalate, the cerium salt is at least one of cerium nitrate and cerium chloride, and the tin salt is tin tetrachloride.

3. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: The iron salt is ferric nitrate, the molybdenum salt is molybdenum sulfate, the cobalt salt is at least one of cobalt nitrate and cobalt acetate, and the nitrogen salt is at least one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide.

4. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: The filter media substrate is one of PPS fiber filter media, PE filter media, glass fiber filter media or P84 filter media.

5. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: The active stock solution also includes, by mass percentage: Activator 15-23%; Dispersant 0.3-1%; Coupling agent 0.5-1.9%; Deionized water 45-65%.

6. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: The activator is one of sodium carbonate, potassium hydroxide, or ammonia water; the dispersant is at least one of fatty alcohol polyoxyethylene ether and sodium dinaphthylmethane disulfonate; the coupling agent is one of vinyltris(β-methoxyethoxy)silane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and γ-aminopropylmethyldiethoxysilane.

7. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 1, characterized in that: In step (2), when the filter substrate and the active stock solution are transferred into the reactor for reaction, the reactor needs to be fixed on the rotating support of the reactor; and the reaction temperature in the reactor is set to 90-150℃, the reaction time is 20-28 hours, and the rotation speed of the rotating support is 200-400 rpm. In step (3), the drying equipment used is a forced-air drying oven. The drying conditions are: first dry at 60-100℃ for 50-100 minutes, then raise the temperature to 101-290℃ and dry for 50-300 minutes.

8. The method for preparing a multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface according to claim 7, characterized in that: The curing agent is either anhydrous ethanol or isopropanol.

9. The application of the multifunctional filter material for dust removal and denitrification with a rod-shaped catalytic interface prepared by any one of the preparation methods described in claims 1-8 in the adsorption of flue gas in the steel manufacturing industry.

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