Cubic catalytic interface dust removal denitration multifunctional filter material, preparation method and application thereof

Abstract

The present application relates to air pollution control and catalytic material technical field, specifically relates to a kind of cubic catalytic interface dust removal denitration multifunctional filter material, preparation method and application;The preparation raw material of the dust removal denitration multifunctional filter material includes active stock solution and filter substrate;The composition of active stock solution includes: active component precursor 9-18% by mass fraction;Morphology additive 5-13%;Active component precursor includes manganese salt, niobium salt, cerium salt, samarium salt and chromium salt, and the molar ratio of Mn / Nb / Ce / Sm / Cr element in active component precursor is 1:(0.1-1):(0.75-1.5):(0.5-1):(0.5-1);Morphology additive includes iron salt, nickel salt, lanthanum salt and copper salt, and the element molar ratio of Fe / Ni / La / Cu in morphology additive is 1:(0.1-1):(0.1-1):(0.1-0.5).The cubic catalytic interface of morphology can be more closely combined with filter fiber, and has the characteristics of high NO x Removal rate, high N2 selectivity;The present application has important significance for the popularization and application of gas synergistic dust removal denitration technology in cement industry.

Description

Technical Field

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

[0002] The cement industry also uses coal as its primary fuel, which is a source of PM2.5. 2.5 and NO x Ammonia is one of the largest sources of emissions, yet the cement industry lacks mature denitrification technology. Currently, the cement industry generally uses baghouse dust collectors for dust removal and selective non-catalytic reduction (SNCR) technology for denitrification. However, SNCR technology is prone to causing excessive ammonia escape and has low denitrification efficiency. Selective catalytic reduction (SCR) technology, as the mainstream NOx removal technology, is applied in 98% of power plants, but for the cement industry, due to its complex operating conditions and lack of additional space to operate denitrification reactors, SCR technology cannot be used. Therefore, there is an urgent need for a stable and efficient new technology to meet the cement industry's needs for nitrogen oxide removal.

[0003] Dual-function filter media for dust removal and denitrification can simultaneously remove NO from flue gas. x While dust removal and denitrification filter media technology is widely used, there are currently few patents specifically for its application in the cement industry. Among the existing domestic patents for dust removal and denitrification filter media, patent (CN103463871A) first impregnates and dries glass fiber with a denitrification catalyst, then performs high-temperature hot-pressing coating with a polytetrafluoroethylene (PTFE) surface film to produce a dual-function filter media. Patent (CN114699845A) first modifies polyphenylene sulfide with sodium alginate, then uses an excessive impregnation method to load the denitrification active components MnO2-CeO2-Co3O4; finally, it sprays PTFE slurry to obtain the same dual-function filter media. Both of these patents use an impregnation method to load the SCR catalyst onto the filter media substrate, which can lead to uneven loading of the active components and a tendency for them to pulverize and detach. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a multifunctional filter media for dust removal and denitrification with a cubic catalytic interface, its preparation method, and its application. This filter media with a cubic catalytic interface consists of a filter media substrate and a cubic catalytic interface wrapped around the surface of the substrate. This cubic catalytic interface can more tightly bond with the filter media fibers and possesses NO... x It features high removal efficiency and high N2 selectivity. This filter media requires no equipment modification during use and can simultaneously remove dust and NO in a dust collector. x Within 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 industries such as cement.

[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 cubic 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] 9-18% of the active component precursor;

[0009] Morphology aids 5-13%;

[0010] The active component precursor includes manganese salt, niobium salt, cerium salt, samarium salt and chromium salt, and the molar ratio of Mn / Nb / Ce / Sm / Cr elements in the active component precursor is 1:(0.1-1):(0.75-1.5):(0.5-1):(0.5-1); the morphology aid includes iron salt, nickel salt, lanthanum salt and copper salt, and the molar ratio of Fe / Ni / La / Cu elements in the morphology aid is 1:(0.1-1):(0.1-1):(0.1-0.5).

[0011] Preferably, the manganese salt is one of manganese nitrate and manganese chloride, the cerium salt is one of cerium nitrate and cerium chloride, the samarium salt is one of samarium nitrate and samarium chloride, the chromium salt is chromium nitrate, and the niobium salt is niobium oxalate.

[0012] Preferably, the iron salt is ferric nitrate, the nickel salt is one of nickel nitrate and nickel acetate, the lanthanum salt is one of lanthanum acetate and lanthanum sulfate, and the copper salt is one of copper sulfate and copper chloride.

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

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

[0015] Dispersant 0.5-1%,

[0016] Activator 9-21%,

[0017] Deionized water 50%-75%.

[0018] Preferably, the dispersant is at least one of fatty alcohol polyoxyethylene ether and sodium dinaphthylmethane disulfonate; the activator is either ammonia or potassium hydroxide.

[0019] A method for preparing a multifunctional filter media for dust removal and denitrification with a cubic catalytic interface, the method comprising the following steps:

[0020] (1) Preparation of active stock solution

[0021] The active component precursor, morphology aid, dispersant and activator are added together to deionized water and magnetically stirred at 20-30℃ with a stirring speed of 100-250 rpm to completely dissolve all components in deionized water to obtain the active stock solution.

[0022] (2) In-situ growth of catalytic interface

[0023] 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 cubic catalytic interfaces on the surface of the filter media substrate, and the active components with cubic catalytic interfaces are coated on the surface of the filter media substrate fibers.

[0024] (3) Cubic catalytic interface solidification and shaping

[0025] Take out the filter material substrate obtained in step (2), soak and wash it with curing agent at least 3 times to solidify and shape the cubic 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 cubic catalytic interface for dust removal and denitrification.

[0026] 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 160-210°C, the reaction time is 11-15 hours, and the rotation speed of the rotating support is 150-300 rpm.

[0027] The equipment used for drying in step (3) is a forced-air drying oven. The drying conditions are: first dry at 60-150℃ for 30-200 minutes, then raise the temperature to 151-300℃ and dry for 60-500 minutes.

[0028] Preferably, the curing agent is one of ethanol or polyethylene glycol 400.

[0029] Preferably, the multifunctional filter material for dust removal and denitrification with a cubic catalytic interface is used in the cement manufacturing industry for adsorbing dust.

[0030] The beneficial effects of this invention are:

[0031] (1) In the cubic catalytic interface dust removal and denitrification multifunctional filter material provided by the present invention, the cubic catalytic interface can be more tightly bonded to the filter material fiber. After a 1200-hour purging test at a flow rate of 2 m / min, the catalyst wear rate does not exceed 1%; and it has NO x It features high removal rate and high N2 selectivity;

[0032] (2) Using the cubic 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℃;

[0033] (3) The preparation method of the present invention is simple and has high production feasibility;

[0034] (4) This invention is of great significance for the promotion and application of gas-assisted dust removal and denitrification technology in the cement industry. Attached Figure Description

[0035] 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.

[0036] Figure 1 These are SEM images of the finished multifunctional filter material with cubic catalytic interface for dust removal and denitrification proposed in this invention at different scales. Detailed Implementation

[0037] 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.

[0038] Example 1

[0039] 1. Preparation of active stock solution

[0040] Weigh 18g (18%) of the active component precursor, 5g (5%) of the morphology aid, 1g (1%) of the dispersant, 21g (21%) of the activator, and 55g (55%) of the deionized water. Based on the elemental molar ratio of Mn / Nb / Ce / Sm / Cr being 1:0.1:1.5:1:0.5 and the elemental molar ratio of Fe / Ni / La / Cu being 1:0.1:1:0.1, calculate the amount of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as the morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate, and dissolve them in the deionized water. Then weigh the corresponding mass of the dispersant fatty alcohol polyoxyethylene ether and the activator ammonia water, add them together to the deionized water, and perform constant temperature magnetic stirring at 30°C and a stirring speed of 100 rpm to ensure complete dissolution.

[0041] 2. In-situ growth at the catalytic interface

[0042] The P84 dust collector filter material was immersed in the activated stock solution stirred in step 1, and ultrasonically vibrated at 40°C for 120 minutes with continuous stirring at a speed of 800 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 11 hours, the reaction temperature was 210°C, and the rotation speed of the rotating support was 150 rpm.

[0043] 3. Cubic catalytic interface solidification and shaping

[0044] Take out the dust removal filter material obtained in step 2, soak and wash it three times with curing agent ethanol, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 150℃ for 30 minutes, and then at 300℃ for 60 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0045] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0046] sample temperature Denitrification rate Dust removal rate Wear rate Example 1 200℃ 95％ 99％ 1％

[0047] NO x The removal efficiency test method is as follows:

[0048] 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.

[0049] The catalytic activity of the catalyst is determined by NO x The removal efficiency 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:

[0050] NO x Removal rate = [(c0-c) / c0] × 100%

[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] The catalyst loading strength test method is as follows:

[0056] The catalyst loading strength testing device consists of a gas source, a flow controller, and a self-made stainless steel sleeve. Using the gas source and flow controller, N2 is introduced into the stainless steel sleeve to purge the composite filter media for 1200 hours. The catalyst wear rate is then calculated to characterize the bonding strength between the active component and the filter media. The composite filter media for testing catalyst loading strength is fixed in a 30mm outer diameter stainless steel tube. Nitrogen gas is used to simulate flue gas at a flow rate of 2m / min to purge the filter media.

[0057] Catalyst wear rate is calculated by the following formula:

[0058]

[0059] Example 2

[0060] 1. Preparation of active stock solution

[0061] Weigh 9g (9%) of the active component precursor, 13g (13%) of the morphology aid, 0.75g (0.75%) of the dispersant, 15g (15%) of the activator, and 62.25g (62.25%) of deionized water. Based on the elemental molar ratio of Mn / Nb / Ce / Sm / Cr being 1:1:0.75:0.75:1 and the elemental molar ratio of Fe / Ni / La / Cu being 1:1:0.55:0.5, calculate the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as the morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate, and dissolve them in deionized water. Then weigh the corresponding masses of the dispersant sodium dinaphthylmethane disulfonate and the activator potassium hydroxide, add them together to the deionized water, and perform constant temperature magnetic stirring at 20°C and a stirring speed of 250 rpm to ensure complete dissolution.

[0062] 2. In-situ growth at the catalytic interface

[0063] Immerse the chlorinated dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 45°C for 10 minutes while continuously stirring at a speed of 100 rpm. Transfer the treated dust collector filter material and activated stock solution into a reaction vessel and fix the reaction vessel on a rotating support of the reactor. The reaction time is 13 hours and the reaction temperature is 160°C. The rotation speed of the rotating support is 300 rpm.

[0064] 3. Cubic catalytic interface solidification and shaping

[0065] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent polyethylene glycol 400, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 60℃ for 200 minutes, and then at 151℃ for 500 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0066] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0067] sample temperature Denitrification rate Dust removal rate Wear rate Example 2 200℃ 96％ 99％ 0.8％

[0068] NO x The methods for testing removal efficiency, dust removal efficiency, and catalyst loading strength are the same as in Example 1.

[0069] Example 3

[0070] 1. Preparation of active stock solution

[0071] Weigh 13.5g (13.5%) of the active component precursor, 9g (9%) of the morphology aid, 0.75g (0.75%) of the dispersant, 15g (15%) of the activator, and 61.75g ​​(61.75%) of the deionized water. Based on the elemental molar ratios of Mn / Nb / Ce / Sm / Cr being 1:0.55:1.125:0.75:0.75 and Fe / Ni / La / Cu being 1:0.55:0.55:0.3, the amounts of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as the morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate, were calculated and dissolved in deionized water. Then, the corresponding masses of the dispersant sodium dinaphthylmethane disulfonate and the activator potassium hydroxide were weighed and added to the deionized water. The mixture was then subjected to constant-temperature magnetic stirring at 25°C and a stirring speed of 175 rpm to ensure complete dissolution.

[0072] 2. In-situ growth at the catalytic interface

[0073] Immerse the PE dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 45°C for 65 minutes while continuously stirring at a speed of 450 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 13 hours and the reaction temperature is 185°C. The rotation speed of the rotating support is 225 rpm.

[0074] 3. Cubic catalytic interface solidification and shaping

[0075] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent polyethylene glycol 400, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 105℃ for 115 minutes, and then at 225℃ for 280 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0076] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0077] sample temperature Denitrification rate Dust removal rate Wear rate Example 3 200℃ 99％ 99％ 0.1％

[0078] NO x The methods for testing removal efficiency, dust removal efficiency, and catalyst loading strength are the same as in Example 1.

[0079] Example 4

[0080] 1. Preparation of active stock solution

[0081] Weigh 13.5g (13.5%) of the active component precursor, 10g (10%) of the morphology aid, 0.5g (0.5%) of the dispersant, 9g (9%) of the activator, and 67g (67%) of the deionized water. Based on the elemental molar ratio of Mn / Nb / Ce / Sm / Cr of 1:0.55:1.125:0.5:0.75 and the elemental molar ratio of Fe / Ni / La / Cu of 1:0.55:0.1:0.1, calculate the amount of the active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as the morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate, and dissolve them in the deionized water. Then weigh the corresponding mass of the dispersant sodium dinaphthylmethane disulfonate and the activator potassium hydroxide, add them together to the deionized water, and perform constant temperature magnetic stirring at 20°C and a stirring speed of 200 rpm to ensure complete dissolution.

[0082] 2. In-situ growth at the catalytic interface

[0083] Immerse the PPS dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 50°C for 10 minutes while continuously stirring at a speed of 450 rpm. Transfer the treated dust collector filter material and activated stock solution together into a reaction vessel, and fix the reaction vessel on a rotating support of the reactor. The reaction time is 15 hours, the reaction temperature is 150°C, and the rotation speed of the rotating support is 150 rpm.

[0084] 3. Cubic catalytic interface solidification and shaping

[0085] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent polyethylene glycol 400, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 100℃ for 100 minutes, and then at 200℃ for 500 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0086] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0087] sample temperature Denitrification rate Dust removal rate Wear rate Example 4 200℃ 97％ 99％ 0.5％

[0088] NO x The methods for testing removal efficiency, dust removal efficiency, and catalyst loading strength are the same as in Example 1.

[0089] Comparative Example 1

[0090] 1. Preparation of active stock solution

[0091] Weigh 9g (9%) of active morphology aid, 0.75g (0.75%) of dispersant, 15g (15%) of activator, and 75.35g (75.35%) of deionized water. Based on the elemental molar ratio of Mn / Nb / Ce / Sm / Cr being 1:0.55:1.125:0.75:0.75 and the elemental molar ratio of Fe / Ni / La / Cu being 1:0.55:0.55:0.3, calculate the amount of active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate to be added, and dissolve them in deionized water. Then weigh the corresponding mass of dispersant sodium dinaphthylmethane disulfonate and activator potassium hydroxide, add them together to the deionized water, and perform constant temperature magnetic stirring at 25°C and a stirring speed of 175 rpm to ensure complete dissolution.

[0092] 2. In-situ growth at the catalytic interface

[0093] Immerse the PE dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 45°C for 65 minutes while continuously stirring at a speed of 450 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 13 hours and the reaction temperature is 185°C. The rotation speed of the rotating support is 225 rpm.

[0094] 3. Cubic catalytic interface solidification and shaping

[0095] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent polyethylene glycol 400, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 105℃ for 115 minutes, and then at 225℃ for 280 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0096] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0097] sample temperature Denitrification rate Dust removal rate Wear rate Comparative Example 1 200℃ 9％ 99％ 10％

[0098] NO x The methods for testing removal efficiency, dust removal efficiency, and catalyst loading strength are the same as in Example 1.

[0099] Comparative Example 2

[0100] 1. Preparation of active stock solution

[0101] Weigh 13.5g (13.5%) of the active component precursor, 0.75g (0.75%) of the dispersant, 15g (15%) of the activator, and 70.75g (70.75%) of deionized water. Based on the elemental molar ratio of Mn / Nb / Ce / Sm / Cr of 1:0.55:1.125:0.75:0.75 and the elemental molar ratio of Fe / Ni / La / Cu of 1:0.55:0.55:0.3, calculate the amount of active component precursors manganese nitrate, cerium nitrate, niobium oxalate, samarium nitrate, and chromium nitrate, as well as the morphology aids ferric nitrate, nickel acetate, copper nitrate, and lanthanum nitrate, and dissolve them in deionized water. Then weigh the corresponding mass of the dispersant sodium dinaphthylmethane disulfonate and the activator potassium hydroxide, add them together to the deionized water, and perform constant temperature magnetic stirring at 25°C and a stirring speed of 175 rpm to ensure complete dissolution.

[0102] 2. In-situ growth at the catalytic interface

[0103] Immerse the PE dust collector filter material in the activated stock solution stirred in step 1, and ultrasonically vibrate it at 45°C for 65 minutes while continuously stirring at a speed of 450 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 13 hours and the reaction temperature is 185°C. The rotation speed of the rotating support is 225 rpm.

[0104] 3. Cubic catalytic interface solidification and shaping

[0105] Take out the dust removal filter material obtained in step 2, soak and wash it three times with the curing agent polyethylene glycol 400, and then soak and wash it three times with deionized water; then dry it in a forced-air drying oven, first at 105℃ for 115 minutes, and then at 225℃ for 280 minutes to obtain a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface.

[0106] NO x Removal efficiency, dust removal efficiency, and wear rate:

[0107] sample temperature Denitrification rate Dust removal rate Wear rate Comparative Example 2 200℃ 89％ 99％ 9％

[0108] NO x The methods for testing removal efficiency, dust removal efficiency, and catalyst loading strength are the same as in Example 1.

[0109] 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.

[0110] 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 cubic catalytic interface, characterized in that, The raw materials for preparing the multifunctional dust removal and denitrification filter media include an active raw liquid and a filter media substrate. The filter media substrate is one of PPS fiber filter media, PE filter media, aromatic polyamide fiber filter media, PTFE fiber filter media, glass fiber filter media, P84 filter media, or fluoropolymer filter media. The active stock solution comprises, by mass percentage: 9-18% of the active component precursor; Morphology aids 5-13%; The active component precursor includes manganese salt, niobium salt, cerium salt, samarium salt, and chromium salt, and the molar ratio of Mn / Nb / Ce / Sm / Cr elements in the active component precursor is 1:(0.1-1):(0.75-1.5):(0.5-1):(0.5-1); the morphology aid includes iron salt, nickel salt, lanthanum salt, and copper salt, and the molar ratio of Fe / Ni / La / Cu elements in the morphology aid is 1:(0.1-1):(0.1-1):(0.1-0.5). The preparation method includes the following steps: (1) Preparation of active stock solution The active component precursor, morphology aid, dispersant and activator are added together to deionized water and magnetically stirred at 20-30℃ with a stirring speed of 100-250 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 to carry out a hydrothermal reaction. The reaction temperature in the reaction vessel is set to 160-210℃ and the reaction time is 11-15 hours, so that the active component with cubic morphology catalytic interface is generated in situ on the surface of the filter media substrate and the active component with cubic morphology catalytic interface is coated on the surface of the filter media substrate fiber. (3) Cubic catalytic interface solidification and shaping 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 cubic catalytic interface; then soak and wash it with deionized water at least 3 times to remove the residual curing agent, wherein the curing agent is one of ethanol or polyethylene glycol 400; finally, after drying, a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface can be obtained. The drying conditions are as follows: first dry at 60-150℃ for 30-200 minutes, then raise the temperature to 151-300℃ and dry for 60-500 minutes.

2. The method for preparing a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface according to claim 1, characterized in that: The manganese salt is one of manganese nitrate and manganese chloride, the cerium salt is one of cerium nitrate and cerium chloride, the samarium salt is one of samarium nitrate and samarium chloride, the chromium salt is chromium nitrate, and the niobium salt is niobium oxalate.

3. The method for preparing a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface according to claim 1, characterized in that: The iron salt is ferric nitrate, the nickel salt is one of nickel nitrate and nickel acetate, the lanthanum salt is one of lanthanum acetate and lanthanum sulfate, and the copper salt is one of copper sulfate and copper chloride.

4. The method for preparing a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface according to claim 1, characterized in that: The active stock solution also includes, by mass percentage: Dispersant 0.5-1%, Activator 9-21%, Deionized water 50%-75%.

5. The method for preparing a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface according to claim 1, characterized in that: The dispersant is at least one of fatty alcohol polyoxyethylene ether and sodium dinaphthylmethane disulfonate; the activator is either ammonia or potassium hydroxide.

6. The method for preparing a multifunctional filter material for dust removal and denitrification with a cubic catalytic interface according to claim 1, characterized in that: In step (2), when the filter material 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 rotation speed of the rotating support is 150 to 300 rpm. The drying equipment used in step (3) is a blower drying oven.

7. The multifunctional filter material for dust removal and denitrification with a cubic catalytic interface prepared by the method described in any one of claims 1-6 is used for adsorbing dust in the cement manufacturing industry.

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