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

Abstract

The application belongs to the technical field of functional composite filter material, and particularly relates to a dust removal and denitration multifunctional filter material with flower-shaped catalytic interface, a preparation method and application. The preparation raw material of the dust removal and denitration multifunctional filter material comprises an active stock solution and a filter material substrate. The active stock solution comprises, in percentage by mass, 10-45% of active component precursor and 5-15% of morphology aid. The active component precursor comprises titanium salt, chromium salt, manganese salt and lanthanum salt, and the molar ratio of Ti / Cr / Mn / La elements in the active component precursor is 1:(0.5-0.8):(0.3-0.9):(0.1-0.4). The morphology aid comprises bismuth salt, nitrogen salt, cerium salt and molybdenum salt, and the molar ratio of Bi / N / Ce / Mo elements in the morphology aid is 1:(0.1-0.7):(0.3-0.8):(0.1-0.5). The dust removal and denitration multifunctional filter material is composed of the filter material substrate and the flower-shaped catalytic interface wrapped on the surface of the filter material substrate. The application has important significance for the popularization and application of the synergistic dust removal and denitration technology in the ceramic industry and the like.

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 flower-like catalytic interface, its preparation method, and its application. Background Technology

[0002] The ceramics industry is one of my country's long-standing traditional advantageous industries, occupying an important position in the national economy. According to statistics, in 2017, the total amount of flue gas generated by ceramic kilns was approximately 116.74 trillion cubic meters. 3 If measured by emission concentrations meeting standards, the ceramic industry's particulate matter, SO2, and NO... x The annual emissions were approximately 35,000 tons, 58,000 tons, and 210,000 tons respectively, accounting for 0.44%, 0.66%, and 1.67% of the national industrial emissions in those years, indicating a significant emission volume. Therefore, the ceramics industry is a key sector for air pollution control in my country, and its air pollution prevention and control is of great importance. Currently, the focus of air pollutant control in the ceramics industry is on the building ceramics sector, where dust removal and desulfurization technologies are mature and widely adopted, meeting environmental protection requirements. However, denitrification technology remains imperfect. Fluorides, chlorides, and heavy metals in flue gas are currently mainly controlled through the coordinated use of dust removal, desulfurization, and denitrification facilities, as well as optimization of the firing process and raw material control, which generally meets emission standards. Regarding denitrification, the ceramics industry employs two technologies: Selective Non-Catalytic Reduction (SNCR), which has poor effectiveness, with a denitrification efficiency of only 10%-30%, and the reducing agent affects equipment and products. In contrast, Selective Catalytic Reduction (SCR) technology for kilns offers high denitrification efficiency and is a mature technology, achieving a denitrification efficiency of around 80%. However, due to limitations in operating conditions and costs, there are few cases of SCR technology being applied in the ceramics industry.

[0003] Dual-function filter media for dust removal and denitrification can simultaneously remove dust and NO. xHowever, there is no patent for dual-function filter material for dust removal and denitration in the ceramic industry. Among the patents related to dust removal and denitration filter material, patent (CN114699845A) uses polyphenylene sulfide as the base filter material and modifies polyphenylene sulfide with sodium alginate. Excess impregnation method is used to load denitration active component MnO2-CeO2-Co3O4. After the functional polyphenylene sulfide filter material is impregnated, a 5% polytetrafluoroethylene slurry is sprayed to prepare a dust and denitration integrated filter material. Patent (CN112704959A) adds sodium alginate powder to the precursor solution to form a sol system, and uses a blending method or a two-step method to prepare a dust and denitration integrated filter material. The above patents only coat the catalyst on the surface of the filter material. The direct coating method can cause uneven distribution of catalyst particles, easy falling off, and short service life. At the same time, the catalyst is easily poisoned and deactivated by chlorine and fluorine in the ceramic industry flue gas. SUMMARY

[0004] To overcome the shortcomings of the prior art, the present application provides a dust and denitration multifunctional filter material with a flower-shaped catalytic interface, a preparation method and application. The dust and denitration multifunctional filter material with a flower-shaped catalytic interface is composed of a filter material substrate and a flower-shaped catalytic interface wrapped on the surface of the filter material substrate. The flower-shaped catalytic interface has high removal activity when N2 is combined with NOx, and also has excellent resistance to chlorine, fluoride and SO2 poisoning. The multifunctional filter material does not need to modify any equipment when in use, and can be applied to ceramic industrial roller kiln, tunnel kiln, shuttle kiln, etc., and can simultaneously remove dust and NO x In the temperature range of 140-180℃, the denitration rate is ≥98%.

[0005] The object of the present application can be achieved by the following technical solutions:

[0006] A dust and denitration multifunctional filter material with a flower-shaped catalytic interface, the preparation raw materials of the dust and denitration multifunctional filter material with a flower-shaped catalytic interface include an active solution and a filter material substrate;

[0007] The composition of the active solution includes, by mass percentage:

[0008] Active component precursor 10-45%,

[0009] Morphology aid 5-15%;

[0010] The active component precursor includes titanium salt, chromium salt, manganese salt and lanthanum salt, and the molar ratio of Ti / Cr / Mn / La elements in the active component precursor is 1:(0.5-0.8):(0.3-0.9):(0.1-0.4); the morphology assistant includes bismuth salt, nitrogen salt, cerium salt and molybdenum salt, and the molar ratio of Bi / N / Ce / Mo elements in the morphology assistant is 1:(0.1-0.7):(0.3-0.8):(0.1-0.5).

[0011] Preferably, the titanium salt is one of titanium dioxide and titanium tetrachloride, the chromium salt is one of chromium nitrate, chromium chloride and chromium sulfate, the manganese salt is one of manganese nitrate and manganese sulfate, and the lanthanum salt is one of lanthanum chloride and lanthanum nitrate.

[0012] Preferably, the bismuth salt is one of bismuth trichloride and bismuth oxide, the nitrogen salt is one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide, the cerium salt is one of cerium nitrate and cerium sulfate, and the molybdenum salt is molybdenum sulfate.

[0013] Preferably, the filter material substrate is one of PPS fiber filter material, PTFE fiber filter material, glass fiber filter material, P84 filter material or fluorine mises filter material.

[0014] Preferably, the active stock solution further includes, in terms of mass percentage:

[0015] activating coupling agent 10-25%,

[0016] co-solvent 1-15%,

[0017] deionized water 25-74%.

[0018] Preferably, the activating coupling agent is one of sodium hydroxide or sodium hypochlorite; the co-solvent is one of isopropyl alcohol, acetone and ethyl acetate.

[0019] A preparation method of a dust removal and denitration multifunctional filter material with flower-shaped catalytic interface, the preparation method comprising the following steps:

[0020] (1) Preparation of active stock solution

[0021] The active component precursor, the morphology assistant, the activating coupling agent and the co-solvent are added together into the deionized water, constant temperature magnetic stirring is carried out at 20-50°C, the stirring speed is 150-260 revolutions per minute, and each component is completely dissolved in the deionized water to obtain the active stock solution;

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

[0023] The filter material substrate is first immersed in the active stock solution and continuously oscillated and stirred to pretreat the filter material substrate; the pretreated filter material substrate and the active stock solution are then moved into a reaction kettle, and the reaction kettle is fixed on a reactor, so that the filter material substrate and the active stock solution are mechanically mixed in the reactor, so that the active component with a flower-shaped catalytic interface is generated in situ on the surface of the filter material substrate, and the active component with the flower-shaped catalytic interface is wrapped on the surface of the filter material substrate fiber;

[0024] (3), flower-shaped catalytic interface solidification and shaping

[0025] The filter material substrate obtained in step (2) is taken out, first soaked with a curing agent for 3 times to solidify and shape the catalytic interface morphology, and then soaked with deionized water for 3 times to remove surface impurities; finally, after drying, the dust and denitration multifunctional filter material with a flower-shaped catalytic interface is obtained.

[0026] Preferably, when the filter material substrate and the active stock solution are moved into the reaction kettle for reaction in step (2), the reaction kettle needs to be fixed on the rotating support of the reactor; and the reaction temperature in the reaction kettle is set to 90-170 DEG C, the reaction time is 20-30 hours, and the rotating support speed is 240-400 revolutions / minute.

[0027] The drying equipment used in step (3) is a forced air drying oven, and the drying conditions are: first dried at 50-120 DEG C for 40-110 minutes, and then heated to 111-300 DEG C for 60-350 minutes.

[0028] Preferably, the curing agent in step (3) is one of polyurethane, vinyl chloride or ammonium sulfate.

[0029] Preferably, the dust and denitration multifunctional filter material with a flower-shaped catalytic interface is used for adsorbing smoke dust in the ceramic manufacturing industry.

[0030] The beneficial effects of the present application are:

[0031] (1), the present application provides a flower-shaped catalytic interface dust and denitration multifunctional filter material, and the active component loaded on the filter material has a flower-shaped morphology, the flower-shaped catalytic interface N2 selectivity and NO x The active component has high removal activity, and also has excellent resistance to chlorine, fluoride and SO2 poisoning performance;

[0032] (2), the flower-shaped catalytic interface dust and denitration multifunctional filter material provided by the present application is used, and the denitration is greater than or equal to 98% in the temperature range of 140-180 DEG C;

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

[0034] (4), the application has important significance for popularization and application of the gas coordinated dust removal and denitration technology in the building ceramic industry, and can be applicable to industrial scenes such as roller kiln, tunnel kiln and shuttle kiln of the ceramic industry. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 is the SEM image of the dust removal and denitration multifunctional filter material product with flower-shaped catalytic interface in different scales proposed in the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0038] Embodiment 1

[0039] (1), configure the precursor stock solution

[0040] Take 10g (10%) of the active component precursor, 5g (5%) of the morphology aid, 10g (10%) of the activation coupling agent, 1g (1%) of the cosolvent, and 74g (74%) of deionized water. The element molar ratio of Ti / Cr / Mn / La is 1:0.5:0.3:0.1; the element molar ratio of Bi / N / Ce / Mo is 1:0.1:0.3:0.1. The addition amount of the active component precursors titanium dioxide, chromium nitrate, manganese nitrate and lanthanum chloride and the morphology aids bismuth trichloride, 1-methyl-2-pyrrolidone, cerium nitrate and molybdenum sulfate are calculated respectively, and they are dissolved in deionized water; then the corresponding mass of the activation coupling agent sodium hydroxide and the cosolvent isopropanol are weighed and added into the deionized water, and constant temperature magnetic stirring is carried out at 20 DEG C, the stirring speed is 150 revolutions / minute, so that they are completely dissolved.

[0041] (2), in-situ growth of catalytic interface

[0042] The PPS fiber filter material is immersed in the precursor solution stirred in step (1), and is ultrasonically oscillated at 20℃ for 40 minutes, and is continuously stirred at a stirring speed of 100 revolutions per minute; the treated dust removal filter material and the precursor solution are moved into a reactor, and the reactor is fixed on a rotating support of the homogeneous reactor, the homogeneous reaction time is 20 hours, the reaction temperature is 90℃, and the rotating speed of the rotating support is 240 revolutions per minute.

[0043] (3), catalytic interface curing and shaping

[0044] The dust removal filter material obtained in step (2) is taken out, is immersed and washed with a curing agent polyurethane for 3 times, and is immersed and washed with deionized water for 3 times; drying is carried out in a forced air drying oven, first at 50℃ for 50 minutes, and then at 111℃ for 60 minutes, to obtain a flower-shaped catalytic interface dust removal and denitration multifunctional filter material.

[0045] The dust removal and denitration composite multifunctional filter material prepared is subjected to performance determination.

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

[0047] The experimental device is composed of a gas distribution system, a flow control (mass flow meter), a gas mixer, a gas preheater, a catalytic reactor and a flue gas analysis system. The inner diameter is Ф=20mm. The filter cloth is cut into a Ф=20mm round piece and placed in a fixed reactor, and the temperature of the constant temperature zone where the filter cloth is located is controlled, and then the reactor is placed in a fixed tubular reactor. The simulated flue gas composition is: NO (500ppm), NH3 (500ppm), chlorine (100ppm), hydrogen fluoride (100ppm), SO2 (200ppm), O2 (8%) and carrier gas N2, the filtration wind speed is 1m / min, NH3 / NO=1, and the reaction temperature is controlled at 200℃. The flow of each gas is controlled by a mass flow meter. The gas enters the reactor after being mixed by a gas mixer and heated by a heater. The NO x concentration of the gas inlet and outlet is measured by a KM9106 (kane) flue gas analyzer. In order to eliminate the influence of surface adsorption, the system starts to collect the test after running stably for 20-30 minutes.

[0048] The catalytic activity of the catalyst is mainly reflected by the denitration activity of NO x , and the denitration activity of NO x is calculated by the following formula:

[0049]

[0050] In the formula, C0 is the initial concentration, and C is the concentration after flue gas treatment.

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

[0052] The sample filtration performance is tested by using a VDI filter material simulation test device, Pural NF aluminum oxide dust is selected, dust concentration is 5 g / m 3 , filtration air speed is 2 m / min, dust removal pressure difference is 1000 Pa, test area is 0.0154 m 2 , pulse blowing interval is 5 s, tank pressure is 0.5 MPa, humidity is less than 50%, and pulse valve opening time is 60 ms. The dust removal rate is calculated by the following formula:

[0053]

[0054] In the formula, u is the initial concentration, and u0 is the concentration after flue gas treatment.

[0055] NO x Removal efficiency and dust removal efficiency:

[0056] Sample Temperature Denitration activity Dust removal rate Example 1 200℃ 83％ 99％

[0057] Example 2

[0058] (1) Configure precursor stock solution

[0059] Take 15 g (15%) of active component precursor, 7 g (7%) of morphology additive, 15 g (15%) of activation coupling agent, 3 g (3%) of cosolvent, and 60 g (60%) of deionized water. The element molar ratio of Ti / Cr / Mn / La is 1:0.6:0.5:0.2, and the element molar ratio of Bi / N / Ce / Mo is 1:0.2:0.4:0.2. The addition amounts of titanium tetrachloride, chromium chloride, manganese sulfate, lanthanum nitrate, bismuth chloride, N, N-dimethylformamide, cerium sulfate, and molybdenum sulfate are calculated respectively, and they are dissolved in deionized water. Then, the corresponding mass of activation coupling agent sodium hypochlorite and cosolvent propanol are weighed and added to the deionized water. Constant temperature magnetic stirring is carried out at 30°C, the stirring speed is 180 revolutions / minute, and complete dissolution is achieved.

[0060] (2) In-situ growth of catalytic interface

[0061] The P84 filter material is immersed in the precursor solution stirred in step (1) and ultrasonic oscillation is carried out at 30°C for 60 minutes, and constant stirring is carried out at a stirring speed of 100 revolutions / minute. The treated dust removal filter material and the precursor solution are moved into the reactor together, and the reactor is fixed on the rotating support of the homogeneous reactor. The homogeneous reaction time is 23 hours, the reaction temperature is 120°C, and the rotating speed of the rotating support is 280 revolutions / minute.

[0062] (3) Catalytic interface solidification and shaping

[0063] The dust removal filter material obtained in step (2) is taken out, and is soaked and washed with the solidifying agent vinyl chloride for 3 times, and then is soaked and washed with deionized water for 3 times; drying is carried out in a blowing drying box, first at 70 DEG C for 70 minutes, and then at 160 DEG C for 100 minutes, to obtain a flower-shaped catalytic interface dust removal and denitration multifunctional filter material.

[0064] The prepared dust removal and denitration multifunctional filter material is subjected to performance test, and the NO X , the dust removal rate test method is the same as that in example 1.

[0065] The test results are as follows:

[0066] Sample Temperature Denitration activity Dust removal rate Example 2 200℃ 89％ 99％

[0067] Example 3

[0068] (1), configuration of precursor stock solution

[0069] 30 g (30%) of active component precursor, 12 g (12%) of morphology aid, 20 g (20%) of activation coupling agent, 5 g (5%) of cosolvent, and 33 g (33%) of deionized water are weighed. The element molar ratio of Ti / Cr / Mn / La is 1:0.7:0.7:0.3, and the element molar ratio of Bi / N / Ce / Mo is 1:0.5:0.6:0.3. The addition amount of the active component precursors titanium dioxide, chromium nitrate, manganese nitrate, and lanthanum chloride, and the morphology aids bismuth trichloride, 1-methyl-2-pyrrolidone, cerium nitrate, and molybdenum sulfate are calculated respectively, and are dissolved in deionized water; the corresponding mass of the activation coupling agent sodium hydroxide and the cosolvent isopropanol are weighed and added to the deionized water, and constant temperature magnetic stirring is carried out at 40 DEG C, with a stirring speed of 220 revolutions / minute, so that they are completely dissolved.

[0070] (2), in-situ growth of catalytic interface

[0071] The PTFE fiber filter material is immersed in the precursor solution after stirring in step (1), ultrasonic oscillation is carried out at 40 DEG C for 120 minutes, and constant stirring is carried out, with a stirring speed of 300 revolutions / minute; the treated dust removal filter material and the precursor solution are moved into the reactor together, and the reactor is fixed on the rotating support of the homogeneous reactor, the homogeneous reaction time is 26 hours, the reaction temperature is 140 DEG C, and the rotating speed of the rotating support is 350 revolutions / minute.

[0072] (3), solidification and shaping of catalytic interface

[0073] The dust removal filter material obtained in step (2) is taken out, soaked and washed with solidifying agent polyurethane for 3 times, and then soaked and washed with deionized water for 3 times; drying is performed in a blast drying oven, first at 100°C for 80 minutes, and then at 240°C for 280 minutes, to obtain a flower-shaped catalytic interface dust removal and denitration multifunctional filter material.

[0074] The prepared dust removal and denitration multifunctional filter material is subjected to performance testing, and the NO x , and the dust removal rate test method is the same as that in Example 1.

[0075] The test results are as follows:

[0076] Sample Temperature Denitration activity Dust removal rate Example 3 200℃ 98％ 99.9％

[0077] Example 4

[0078] (1) Preparation of precursor solution

[0079] 40 g (40%) of active component precursor, 8 g (8%) of morphology aid, 19 g (19%) of activation coupling agent, 8 g (8%) of cosolvent, and 25 g (25%) of deionized water are weighed. The element molar ratio of Ti / Cr / Mn / La is 1:0.8:0.9:0.4, and the element molar ratio of Bi / N / Ce / Mo is 1:0.7:0.8:0.5. The addition amounts of active component precursors titanium tetrachloride, chromium sulfate, manganese sulfate, and lanthanum nitrate, and the morphology aid bismuth chloride, N, N-dimethylformamide, cerium sulfate, and molybdenum sulfate are calculated respectively, and are dissolved in deionized water. The corresponding mass of activation coupling agent sodium hypochlorite and cosolvent ethyl acetate are weighed and added to the deionized water, and constant temperature magnetic stirring is performed at 50°C, with a stirring speed of 260 revolutions / minute, to completely dissolve them.

[0080] (2) In-situ growth of catalytic interface

[0081] The glass fiber filter material is immersed in the precursor solution after stirring in step (1), ultrasonic oscillation is performed at 50°C for 150 minutes, and constant stirring is performed at a stirring speed of 400 revolutions / minute. The treated dust removal filter material and the precursor solution are moved into the reactor together, and the reactor is fixed on the rotating support of the homogeneous reactor. The homogeneous reaction time is 30 hours, the reaction temperature is 170°C, and the rotating speed of the rotating support is 350 revolutions / minute.

[0082] (3) Catalytic interface solidification and shaping

[0083] The dust removal filter material obtained in step (2) is taken out, soaked and washed with solidifying agent polyurethane for 3 times, and then soaked and washed with deionized water for 3 times; drying is performed in a blast drying oven, first at 100°C for 80 minutes, and then at 240°C for 280 minutes, to obtain a flower-shaped catalytic interface dust removal and denitration multifunctional filter material.

[0084] The prepared dust and denitration multifunctional filter material was tested for performance, NO x , and the dust removal rate test method was the same as in Example 1.

[0085] The test results are as follows:

[0086] Sample Temperature Denitration activity Dust removal rate Example 4 200℃ 91％ 99％

[0087] Comparative Example 1

[0088] (1) Preparation of precursor stock solution

[0089] 12 g (12%) of morphology aid, 20 g (20%) of activation coupling agent, 5 g (5%) of cosolvent, and 63 g (63%) of deionized water were weighed. The element molar ratio of Bi / N / Ce / Mo was 1:0.5:0.6:0.3, and the addition amounts of bismuth trichloride, 1-methyl-2-pyrrolidone, cerium nitrate, and molybdenum sulfate were calculated respectively. The above-mentioned substances were dissolved in deionized water. The corresponding amounts of activation coupling agent sodium hydroxide and cosolvent isopropyl alcohol were weighed and added to the deionized water. Constant temperature magnetic stirring was carried out at 40°C, and the stirring speed was 220 revolutions / minute to make it completely dissolved.

[0090] (2) In-situ growth of catalytic interface

[0091] The PTFE fiber filter material was immersed in the precursor solution stirred in step (1) and ultrasonic oscillation was carried out at 40°C for 120 minutes, and constant stirring was carried out at a stirring speed of 300 revolutions / minute. The treated dust removal filter material and the precursor solution were moved into the reactor together, and the reactor was fixed on the rotating support of the homogeneous reactor. The homogeneous reaction time was 26 hours, the reaction temperature was 140°C, and the rotating speed of the rotating support was 350 revolutions / minute.

[0092] (3) Catalytic interface solidification and shaping

[0093] The dust removal filter material obtained in step (2) was taken out, washed with a curing agent polyurethane for 3 times, and then washed with deionized water for 3 times. Drying was carried out in a forced air drying oven, first at 100°C for 80 minutes, and then at 240°C for 280 minutes, to obtain a flower-shaped catalytic interface dust and denitration multifunctional filter material.

[0094] The prepared dust and denitration multifunctional filter material was tested for performance, NO x , and the dust removal rate test method was the same as in Example 1.

[0095] The test results are as follows:

[0096] Sample Temperature Denitration activity Dust removal rate Comparative Example 1 200℃ 12％ 99％

[0097] Comparative Example 2

[0098] (1) Preparation of precursor solution

[0099] The active component precursor 30 g (30%), the activation coupling agent 20 g (20%), the cosolvent 5 g (5%), and deionized water 45 g (45%) were weighed. The element molar ratio of Ti / Cr / Mn / La was 1:0.7:0.7:0.3. The addition amount of the active component precursor titanium dioxide, chromium nitrate, manganese nitrate, and lanthanum chloride was calculated respectively, and they were dissolved in deionized water. The corresponding mass of the activation coupling agent sodium hydroxide and the cosolvent isopropyl alcohol were weighed and added to the deionized water. The constant temperature magnetic stirring was carried out at 40°C, and the stirring speed was 220 revolutions / minute, so that it was completely dissolved.

[0100] (2) In-situ growth of catalytic interface

[0101] The PTFE fiber filter material was immersed in the precursor solution stirred in step (1) and ultrasonic oscillation was carried out at 40°C for 120 minutes, and constant stirring was carried out at a stirring speed of 300 revolutions / minute. The treated dust removal filter material and the precursor solution were moved into the reactor together, and the reactor was fixed on the rotating support of the homogeneous reactor. The homogeneous reaction time was 26 hours, the reaction temperature was 140°C, and the rotating speed of the rotating support was 350 revolutions / minute.

[0102] (3) Catalytic interface solidification and shaping

[0103] The dust removal filter material obtained in step (2) was taken out, soaked and washed with the curing agent polyurethane for 3 times, and then soaked and washed with deionized water for 3 times. Drying was carried out in a forced air drying oven, first at 100°C for 80 minutes, and then at 240°C for 280 minutes, to obtain a flower-shaped catalytic interface dust removal and denitration multifunctional filter material.

[0104] The performance of the prepared dust removal and denitration multifunctional filter material was tested, and the NO x The dust removal rate test method was the same as that in Example 1.

[0105] The test results are as follows:

[0106] Sample Temperature Denitration activity Dust removal rate Comparative Example 2 200℃ 65％ 99％

[0107] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0108] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations and modifications are intended to be included within the scope of the application as defined in the following claims.

Claims

1. A dust removal and denitration multifunctional filter material with flower-shaped catalytic interface, characterized in that, The preparation raw material of the dust removal and denitration multifunctional filter material with flower-shaped catalytic interface comprises an active solution and a filter material substrate; The composition of the active solution comprises, in percentage by mass: active component precursor 10-45%, morphology aid 5-15%; The active component precursor comprises titanium salt, chromium salt, manganese salt and lanthanum salt, and the molar ratio of Ti / Cr / Mn / La elements in the active component precursor is 1:(0.5-0.8):(0.3-0.9):(0.1-0.4); the titanium salt is one of titanium dioxide and titanium tetrachloride, the chromium salt is one of chromium nitrate, chromium chloride and chromium sulfate, the manganese salt is one of manganese nitrate and manganese sulfate, and the lanthanum salt is one of lanthanum chloride and lanthanum nitrate; The morphology aid comprises bismuth salt, nitrogen salt, cerium salt and molybdenum salt, and the molar ratio of Bi / N / Ce / Mo elements in the morphology aid is 1:(0.1-0.7):(0.3-0.8):(0.1-0.5); the bismuth salt is one of bismuth trichloride and bismuth oxide, the nitrogen salt is one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide, the cerium salt is one of cerium nitrate and cerium sulfate, and the molybdenum salt is molybdenum sulfate.

2. The dust removal and denitration multifunctional filter material with flower-shaped catalytic interface according to claim 1, characterized in that: The filter material substrate is one of PPS fiber filter material, PTFE fiber filter material, glass fiber filter material, P84 filter material or fluorine mises filter material.

3. The dust removal and denitration multifunctional filter material with flower-shaped catalytic interface according to claim 1, characterized in that: The composition of the active solution further comprises, in percentage by mass: active coupling agent 10-25%, co-solvent 1-15%, deionized water 25-74%.

4. The dust removal and denitration multifunctional filter material with flower-shaped catalytic interface according to claim 3, characterized in that: The active coupling agent is one of sodium hydroxide or sodium hypochlorite; the co-solvent is one of isopropyl alcohol, acetone and ethyl acetate.

5. The method for preparing the dust removal and denitration multifunctional filter material with flower-shaped catalytic interface according to any one of claims 1-4, characterized in that: The preparation method comprises the following steps: (1) Preparation of active solution The active component precursor, the morphology aid, the active coupling agent and the co-solvent are added into the deionized water, and constant temperature magnetic stirring is carried out at 20-50 DEG C, the stirring speed is 150-260 r / min, so that each component is completely dissolved in the deionized water to obtain the active solution; (2) In-situ growth of catalytic interface The filter material substrate is immersed in the active solution and continuously oscillation stirring is carried out to pretreat the filter material substrate; then the pretreated filter material substrate and the active solution are moved into the reaction kettle, and the reaction kettle is fixed on the reactor, so that the filter material substrate and the active solution are mechanically mixed in the reactor, so that the active component with flower-shaped catalytic interface is generated in-situ on the surface of the filter material substrate, and the active component with flower-shaped catalytic interface is wrapped on the surface of the filter material substrate fiber; (3) Solidification and shaping of flower-shaped catalytic interface The filter material substrate obtained in step (2) is taken out, first soaked and washed with the solidifying agent for 3 times to solidify and shape the catalytic interface morphology, and then soaked and washed with deionized water for 3 times to remove the surface impurities; finally, drying is carried out to obtain the dust removal and denitration multifunctional filter material with flower-shaped catalytic interface.

6. The method of claim 5, wherein: In step (2), the filter material substrate and the active solution are moved into the reactor for reaction, and the reactor is fixed on the rotating support of the reactor; the reaction temperature in the reactor is set to 90-170℃, the reaction time is 20-30 hours, and the rotating speed of the rotating support is 240-400 rpm; In step (3), the drying equipment is a forced air drying oven, and the drying conditions are: first drying at 50-120℃ for 40-110 minutes, and then drying at 111-300℃ for 60-350 minutes.

7. The method of claim 5, wherein: In step (3), the curing agent is one of polyurethane, vinyl chloride or ammonium sulfate.

8. The application of the dust removal and denitration multifunctional filter material with flower-shaped catalytic interface according to any one of claims 1-4 or the dust removal and denitration multifunctional filter material with flower-shaped catalytic interface prepared by the preparation method according to any one of claims 5-7 in the adsorption of smoke dust in the ceramic manufacturing industry.

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