CN114130119A - Preparation method and application of filtering material with dust removal, denitration and dioxin removal functions - Google Patents
Preparation method and application of filtering material with dust removal, denitration and dioxin removal functions Download PDFInfo
- Publication number
- CN114130119A CN114130119A CN202111213692.4A CN202111213692A CN114130119A CN 114130119 A CN114130119 A CN 114130119A CN 202111213692 A CN202111213692 A CN 202111213692A CN 114130119 A CN114130119 A CN 114130119A
- Authority
- CN
- China
- Prior art keywords
- dioxin
- polytetrafluoroethylene
- solution
- denitration
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8659—Removing halogens or halogen compounds
- B01D53/8662—Organic halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a preparation method of a filtering material with functions of dedusting, denitrating and dioxin removing, which comprises the following steps: preparation and treatment of polytetrafluoroethylene fiber needled felt and preparation of denitration and dioxin-removal catalyst precursor solution, and specifically adopts Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing an O crystal, polytetrafluoroethylene emulsion and deionized water into a solution, preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water into a solution, uniformly mixing the two mixed solutions, adding a silane coupling agent, stirring in a magnetic stirrer, preparing into a denitration and dioxin-removal catalyst precursor solution, dipping the catalyst precursor solution and baking at high temperature, and preparing the filtering material with the functions of dedusting, denitration and dioxin-removal. The filtering material prepared by the method disclosed by the invention is uniform in loading capacity and obvious in denitration and dioxin removal effects.
Description
Technical Field
The invention relates to the field of filter material processing, in particular to a preparation method and application of a filter material with functions of dust removal, denitration and dioxin removal.
Background
At present, the main modes of harmless treatment of domestic garbage of various countries in the world comprise landfill, composting and incineration. The household garbage incineration power generation can save a large amount of land resources, reduce possible secondary pollution and realize energy resource utilization of garbage.
During the process of burning garbage, a large amount of fly ash, nitrogen oxides and dioxin are generated, which not only harm the environment, but also seriously harm the life health of people. The generated smoke particles can cause particle pollution and haze; nitrogen oxides can cause acid rain, photochemical smog and the like; dioxins can seriously harm the environment and ecosystem. Especially dioxins, have carcinogenic, teratogenic, mutagenic and reproductive hazards.
GB 18485 and 2014 domestic waste incineration pollution control Standard stipulates that the emission concentration of dioxin is 0.1ng TEQ/Nm3Is 10 times more stringent than the prior discharge standard.
The prior art is basically to remove dust, denitrate and remove dioxinAnd (4) carrying out split treatment. Filtering the flue gas by using a dust removal filter bag to remove dust particles; treating the nitrogen oxides by an SCR denitration catalyst or an SNCR technology; solid dioxin molecules are adsorbed by activated carbon injection and a cloth bag, but the removal rate of gaseous dioxin is low. For the proposed integration of dust removal and dioxin removal or the integration technology of dust removal, denitration and dioxin removal, the basic route is to use V2O5Or WO3Or V2O5-WO3The powder is loaded on the surface of the dedusting filter material by the modes of dipping, suction filtration or foaming and the like. The method is not only complicated in process, but also difficult to control the load density and load uniformity, and the surface of the prepared filter material can be attached with a catalyst with larger particles, so that the appearance and the air permeability are influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a filter material with functions of dedusting, denitration and dioxin removal.
The invention solves the technical problems through the following technical scheme:
a preparation method of a filtering material with the functions of dust removal, denitration and dioxin removal is characterized by comprising the following steps:
(1) preparing and treating a polytetrafluoroethylene fiber needled felt:
putting the polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, opening the polytetrafluoroethylene fibers by a fine opener, and carding, cross lapping and needling the fibers to obtain a polytetrafluoroethylene fiber needled felt;
cutting the obtained polytetrafluoroethylene fiber needled felt into pieces with an area of 100cm2Putting the wafer into 0.01mol/L sodium dodecyl benzene sulfonate solution, and performing ultrasonic dispersion for 40-60min to obtain a polytetrafluoroethylene needled felt wafer;
(2) preparing a precursor solution of a denitration and dioxin removal catalyst:
adding Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing O crystal, polytetrafluoroethylene emulsion and deionized water into solution, and stirring in a magnetic stirrer 30-40min for standby;
preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water into a solution, and putting the solution into a magnetic stirrer at the temperature of 60 ℃ to stir for 60-90min until the ammonium metavanadate and the ammonium metatungstate are dissolved;
uniformly mixing the two mixed solutions, adding a silane coupling agent, stirring in a magnetic stirrer, and preparing into a precursor solution of the denitration and dioxin removal catalyst;
(3) impregnation of the catalyst precursor solution:
soaking the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the denitration and dioxin-removal catalyst precursor solution prepared in the step (2);
(4) high-temperature baking:
and (4) placing the impregnated polytetrafluoroethylene needled felt wafer in the step (3) into an oven for gradient drying to obtain the filtering material with the functions of dedusting, denitration and dioxin removal.
Preferably, the fibers loosened in the step (1) enter a carding machine to be carded into a single fiber net, then the single fiber net is subjected to cross lapping and layering, the single fiber net is firstly needled into a bottom surface by a needling machine, then base cloth is put in, the steps are repeated to prepare a top surface, a complete needled felt is formed, and the needling density, the needling frequency and the needling depth of the needling machine are adjusted to ensure that the needled felt is soft.
Preferably, the gram weight of the polytetrafluoroethylene fiber needled felt obtained in the step (1) is controlled to be 850g/m2, and the air permeability is controlled to be 15-10m3/m2/min
Preferably, in the step (3), the polytetrafluoroethylene needled felt wafer prepared in the step (1) is placed into the precursor solution prepared in the step (2) for dipping, and ultrasonic oscillation is performed for 1-2h in the dipping process,
after ultrasonic treatment, excess liquid is rolled out by a compression roller, and the rolling residual rate is controlled to be kept at 150% by modulating the pressure of the compression roller.
Preferably, the gradient drying manner in the step (4) is as follows:
oven drying at 250 deg.C for 5min, heating to 300 deg.C for 5min, heating to 350 deg.C for 5min, and heating to 400 deg.C for 5 min.
Preferably, the Mn (NO)3)2The solution was 50 wt% Mn (NO)3)2And (3) solution.
Preferably, the step (2) is put into a magnetic stirrer to be stirred for 20-30 min.
Preferably, in the step (2), the two mixed solutions are uniformly mixed according to the mass ratio of 1: 1.
Preferably, Mn (NO) is added in the step (2)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing the O crystal, the polytetrafluoroethylene emulsion and the deionized water into a solution according to the mass ratio of (8-10) to (4-5) to (0.8-1) to (4-5);
preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water into a solution according to the mass ratio of (1-2) to (2-3) to (1-2) to (0.8-1) to (3-4).
The invention also discloses application of the preparation method of the filter material with the functions of dedusting, denitrating and dioxin removing in preparation of the filter material.
Compared with the prior art, the invention has the following advantages:
the invention discloses a preparation method of a filter material with dust removal, denitration and dioxin removal functions. The method has the advantages of simple process, uniform loading of the prepared material, and obvious effects of denitration and dioxin removal.
Drawings
FIG. 1 is a schematic diagram of denitration and dioxin removal catalytic performances of a Mn-V-W-Ce-Co-Ox/PTFE filter material in an embodiment of the invention, wherein denitration and dioxin removal catalytic reactions are performed on a fixed reaction bed.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1 preparation method of filter material with dust removal, denitration and dioxin removal functions
The preparation method comprises the following steps:
1. production and treatment of polytetrafluoroethylene fiber needled felt
Putting the wrapped polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, further opening the polytetrafluoroethylene fibers by a fine opener, carding the opened fibers into a single fiber net by a carding machine, crossly lapping and layering the single fiber net, needling the single fiber net into a bottom surface by a needle loom, putting the bottom surface into a base fabric, and repeating the steps to prepare a top surface so as to form the needled felt with a complete sandwich structure. The needling density, the needling frequency and the needling depth of the needling machine are adjusted, so that the needled felt is softer and not compact. Controlling the gram weight of the polytetrafluoroethylene fiber needled felt to be 850g/m2Air permeability of 10m3/m2/min。
Cutting the prepared needled felt into a 100cm area2The round piece is put into 0.01mol/L sodium dodecyl benzene sulfonate solution and is dispersed for 60min by ultrasonic.
2. Preparation of precursor solution of denitration and dioxin removal catalyst
Mixing 50 wt% Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing the O crystal, the polytetrafluoroethylene emulsion and the deionized water into a solution according to the mass ratio of 8:4:4:0.8: 4. Stirring in a magnetic stirrer for 30 min.
The preparation method comprises the steps of preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water according to the mass ratio of 2:3:2:2:1:4, and stirring the mixture in a magnetic stirrer at the temperature of 60 ℃ for 90min until the ammonium metavanadate and the ammonium metatungstate are dissolved.
And (2) uniformly mixing the two mixed solutions according to the mass ratio of 1:1, adding a small amount of silane coupling agent, increasing the coupling effect among different components, placing the mixture into a magnetic stirrer, and stirring for 30min to prepare the precursor solution of the denitration and dioxin removal catalyst.
In the above formulation, 50 wt% Mn (NO)3)2The solution is reduced into MnOx, and mainly plays a role in denitration catalysis; ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal is reduced into CeOx and CoOx, which is mainly used for catalysis promotion and is used for removing dioxin by concerted catalysis, and in addition, the Ce-Co-Ox (cerium and cobalt oxide) has certain sulfur resistance and can prevent the filter material from being caused by SO in the actual use process2And the resulting pasting of the bag; the ammonium metavanadate and the ammonium metatungstate are reduced into VOx and WOx which can act synergistically, so that the catalyst has good denitration and dioxin removal catalytic performance; the polytetrafluoroethylene emulsion mainly has the functions of thickening and increasing the load binding power of the catalyst; monoethanolamine and oxalic acid mainly act to dissolve ammonium metavanadate and ammonium metatungstate.
3. Impregnation of catalyst precursor solution
And (3) putting the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the precursor solution prepared in the step (2), and carrying out ultrasonic oscillation for 1h to fully impregnate the precursor solution into the needled felt. Then, the excessive liquid is rolled out by a compression roller, and the rolling residual ratio is kept at 150% by adjusting the compression roller pressure.
4. High temperature baking
And (4) putting the polytetrafluoroethylene needled felt circular sheet padded in the step (3) into a high-temperature air-blast oven. Because the polytetrafluoroethylene fiber needled felt cannot tolerate ultrahigh temperature, the gradient temperature needs to be set, part of catalyst precursor is converted into a catalyst finished product, the needled felt is protected, and then the temperature is raised for baking. The temperature setting program is: 250 deg.C (5min) -300 deg.C (5min) -350 deg.C (5min) -400 deg.C (5 min). After baking, the catalyst precursor is reduced into a Mn-V-W-Ce-Co-Ox multi-element catalyst, and the filter material (Mn-V-W-Ce-Co-Ox/PTFE filter material) with the functions of dedusting, denitrating and dioxin removing is obtained.
Example 2 preparation method of Filter Material having dust removal, denitration and dioxin removal functions
The preparation method comprises the following steps:
1. production and treatment of polytetrafluoroethylene fiber needled felt
Putting the wrapped polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, further opening the polytetrafluoroethylene fibers by a fine opener, carding the opened fibers into a single fiber net by a carding machine, crossly lapping and layering the single fiber net, needling the single fiber net into a bottom surface by a needle loom, putting the bottom surface into a base fabric, and repeating the steps to prepare a top surface so as to form the needled felt with a complete sandwich structure. The needling density, the needling frequency and the needling depth of the needling machine are adjusted, so that the needled felt is softer and not compact. Controlling the gram weight of the polytetrafluoroethylene fiber needled felt to be 850g/m2Air permeability of 10m3/m2/min。
Cutting the prepared needled felt into a 100cm area2The round piece is put into 0.01mol/L sodium dodecyl benzene sulfonate solution and is dispersed for 60min by ultrasonic.
2. Preparation of precursor solution of denitration and dioxin removal catalyst
Mixing 50 wt% Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal, the polytetrafluoroethylene emulsion and the deionized water are prepared into a solution according to the mass ratio of 10:5:5:1: 5. Stirring in a magnetic stirrer for 40 min.
The preparation method comprises the steps of preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water according to the mass ratio of 1:2:1:1:0.8:3, and stirring the mixture in a magnetic stirrer at the temperature of 60 ℃ for 60min until the ammonium metavanadate and the ammonium metatungstate are dissolved.
And (2) uniformly mixing the two mixed solutions according to the mass ratio of 1:1, adding a small amount of silane coupling agent, increasing the coupling effect among different components, and stirring in a magnetic stirrer for 20-30min to prepare the precursor solution of the denitration and dioxin removal catalyst.
In the above formulation, 50 wt% Mn (NO)3)2The solution is reduced into MnOx, and mainly plays a role in denitration catalysis; ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal is reduced into CeOx and CoOx, which is mainly used for catalysis promotion and is used for removing dioxin by concerted catalysis, and in addition, the Ce-Co-Ox (cerium and cobalt oxide) has certain sulfur resistance and can prevent the filter material from being caused by SO in the actual use process2And the resulting pasting of the bag; the ammonium metavanadate and the ammonium metatungstate are reduced into VOx and WOx which can act synergistically, so that the catalyst has good denitration and dioxin removal catalytic performance; the polytetrafluoroethylene emulsion mainly has the functions of thickening and increasing the load binding power of the catalyst; monoethanolamine and oxalic acid mainly act to dissolve ammonium metavanadate and ammonium metatungstate.
3. Impregnation of catalyst precursor solution
And (3) putting the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the precursor solution prepared in the step (2), and carrying out ultrasonic oscillation for 2 hours to fully impregnate the precursor solution into the needled felt. Then, the excessive liquid is rolled out by a compression roller, and the rolling residual ratio is kept at 150% by adjusting the compression roller pressure.
4. High temperature baking
And (4) putting the polytetrafluoroethylene needled felt circular sheet padded in the step (3) into a high-temperature air-blast oven. Because the polytetrafluoroethylene fiber needled felt cannot tolerate ultrahigh temperature, the gradient temperature needs to be set, part of catalyst precursor is converted into a catalyst finished product, the needled felt is protected, and then the temperature is raised for baking. The temperature setting program is: 250 deg.C (5min) -300 deg.C (5min) -350 deg.C (5min) -400 deg.C (5 min). After baking, the catalyst precursor is reduced into a Mn-V-W-Ce-Co-Ox multi-element catalyst, and the filter material (Mn-V-W-Ce-Co-Ox/PTFE filter material) with the functions of dedusting, denitrating and dioxin removing is obtained.
Example 3 preparation method of Filter Material having dust removal, denitration and dioxin removal Functions
The preparation method comprises the following steps:
1. production and treatment of polytetrafluoroethylene fiber needled felt
Putting the wrapped polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, further opening the polytetrafluoroethylene fibers by a fine opener, carding the opened fibers into a single fiber net by a carding machine, crossly lapping and layering the single fiber net,firstly, the felt is needled into a bottom surface by a needling machine, then base cloth is put in the bottom surface, and the steps are repeated to prepare a top surface, so that the needled felt with a complete sandwich structure is formed. The needling density, the needling frequency and the needling depth of the needling machine are adjusted, so that the needled felt is softer and not compact. Controlling the gram weight of the polytetrafluoroethylene fiber needled felt to be 850g/m2Air permeability of 12m3/m2/min。
Cutting the prepared needled felt into a 100cm area2The round piece is put into 0.01mol/L sodium dodecyl benzene sulfonate solution and is dispersed for 50min by ultrasonic.
2. Preparation of precursor solution of denitration and dioxin removal catalyst
Mixing 50 wt% Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing the O crystal, the polytetrafluoroethylene emulsion and the deionized water into a solution according to the mass ratio of 9:4.2:4.5:0.9: 4.2. Stirring in a magnetic stirrer for 30-40 min.
Preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water according to the mass ratio of 1.5:2.5:1.5:1.5:1:3.5, and stirring the mixture in a magnetic stirrer at the temperature of 60 ℃ for 70min until the ammonium metavanadate and the ammonium metatungstate are dissolved.
And (2) uniformly mixing the two mixed solutions according to the mass ratio of 1:1, adding a small amount of silane coupling agent, increasing the coupling effect among different components, and stirring in a magnetic stirrer for 25min to prepare the precursor solution of the denitration and dioxin removal catalyst.
In the above formulation, 50 wt% Mn (NO)3)2The solution is reduced into MnOx, and mainly plays a role in denitration catalysis; ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal is reduced into CeOx and CoOx, which is mainly used for catalysis promotion and is used for removing dioxin by concerted catalysis, and in addition, the Ce-Co-Ox (cerium and cobalt oxide) has certain sulfur resistance and can prevent the filter material from being caused by SO in the actual use process2And the resulting pasting of the bag; ammonium metavanadate and ammonium metatungstate are reduced into VOx and WOx which can cooperateThe catalyst has good catalytic performance of denitration and dioxin removal; the polytetrafluoroethylene emulsion mainly has the functions of thickening and increasing the load binding power of the catalyst; monoethanolamine and oxalic acid mainly act to dissolve ammonium metavanadate and ammonium metatungstate.
3. Impregnation of catalyst precursor solution
And (3) putting the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the precursor solution prepared in the step (2), and carrying out ultrasonic oscillation for 1-2h to fully impregnate the precursor solution into the needled felt. Then, the excessive liquid is rolled out by a compression roller, and the rolling residual ratio is kept at 150% by adjusting the compression roller pressure.
4. High temperature baking
And (4) putting the polytetrafluoroethylene needled felt circular sheet padded in the step (3) into a high-temperature air-blast oven. Because the polytetrafluoroethylene fiber needled felt cannot tolerate ultrahigh temperature, the gradient temperature needs to be set, part of catalyst precursor is converted into a catalyst finished product, the needled felt is protected, and then the temperature is raised for baking. The temperature setting program is: 250 deg.C (5min) -300 deg.C (5min) -350 deg.C (5min) -400 deg.C (5 min). After baking, the catalyst precursor is reduced into a Mn-V-W-Ce-Co-Ox multi-element catalyst, and the filter material (Mn-V-W-Ce-Co-Ox/PTFE filter material) with the functions of dedusting, denitrating and dioxin removing is obtained.
Example 4 preparation method of Filter Material having dust removal, denitration and Dioxin removal Functions
The preparation method comprises the following steps:
1. production and treatment of polytetrafluoroethylene fiber needled felt
Putting the wrapped polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, further opening the polytetrafluoroethylene fibers by a fine opener, carding the opened fibers into a single fiber net by a carding machine, crossly lapping and layering the single fiber net, needling the single fiber net into a bottom surface by a needle loom, putting the bottom surface into a base fabric, and repeating the steps to prepare a top surface so as to form the needled felt with a complete sandwich structure. The needling density, the needling frequency and the needling depth of the needling machine are adjusted, so that the needled felt is softer and not compact. Controlling the gram weight of the polytetrafluoroethylene fiber needled felt to be 850g/m2Air permeability of 9m3/m2/min。
Cutting the prepared needled felt into a 100cm area2The round piece is put into 0.01mol/L sodium dodecyl benzene sulfonate solution and is dispersed for 55min by ultrasonic.
2. Preparation of precursor solution of denitration and dioxin removal catalyst
Mixing 50 wt% Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal, the polytetrafluoroethylene emulsion and the deionized water are prepared into a solution according to the mass ratio of 9.5:5:5:0.81: 4.2. Stirring in a magnetic stirrer for 35 min.
The preparation method comprises the steps of preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water according to the mass ratio of 2:3:2:1:1:3, and stirring the mixture in a magnetic stirrer at the temperature of 60 ℃ for 88min until the ammonium metavanadate and the ammonium metatungstate are dissolved.
And (2) uniformly mixing the two mixed solutions according to the mass ratio of 1:1, adding a small amount of silane coupling agent, increasing the coupling effect among different components, and stirring in a magnetic stirrer for 20-30min to prepare the precursor solution of the denitration and dioxin removal catalyst.
In the above formulation, 50 wt% Mn (NO)3)2The solution is reduced into MnOx, and mainly plays a role in denitration catalysis; ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal is reduced into CeOx and CoOx, which is mainly used for catalysis promotion and is used for removing dioxin by concerted catalysis, and in addition, the Ce-Co-Ox (cerium and cobalt oxide) has certain sulfur resistance and can prevent the filter material from being caused by SO in the actual use process2And the resulting pasting of the bag; the ammonium metavanadate and the ammonium metatungstate are reduced into VOx and WOx which can act synergistically, so that the catalyst has good denitration and dioxin removal catalytic performance; the polytetrafluoroethylene emulsion mainly has the functions of thickening and increasing the load binding power of the catalyst; monoethanolamine and oxalic acid mainly act to dissolve ammonium metavanadate and ammonium metatungstate.
3. Impregnation of catalyst precursor solution
And (3) putting the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the precursor solution prepared in the step (2), and carrying out ultrasonic oscillation for 2 hours to fully impregnate the precursor solution into the needled felt. Then, the excessive liquid is rolled out by a compression roller, and the rolling residual ratio is kept at 150% by adjusting the compression roller pressure.
4. High temperature baking
And (4) putting the polytetrafluoroethylene needled felt circular sheet padded in the step (3) into a high-temperature air-blast oven. Because the polytetrafluoroethylene fiber needled felt cannot tolerate ultrahigh temperature, the gradient temperature needs to be set, part of catalyst precursor is converted into a catalyst finished product, the needled felt is protected, and then the temperature is raised for baking. The temperature setting program is: 250 deg.C (5min) -300 deg.C (5min) -350 deg.C (5min) -400 deg.C (5 min). After baking, the catalyst precursor is reduced into a Mn-V-W-Ce-Co-Ox multi-element catalyst, and the filter material (Mn-V-W-Ce-Co-Ox/PTFE filter material) with the functions of dedusting, denitrating and dioxin removing is obtained.
Example 5 preparation method of Filter Material having dust removal, denitration and Dioxin removal Functions
The preparation method comprises the following steps:
1. production and treatment of polytetrafluoroethylene fiber needled felt
Putting the wrapped polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, further opening the polytetrafluoroethylene fibers by a fine opener, carding the opened fibers into a single fiber net by a carding machine, crossly lapping and layering the single fiber net, needling the single fiber net into a bottom surface by a needle loom, putting the bottom surface into a base fabric, and repeating the steps to prepare a top surface so as to form the needled felt with a complete sandwich structure. The needling density, the needling frequency and the needling depth of the needling machine are adjusted, so that the needled felt is softer and not compact. Controlling the gram weight of the polytetrafluoroethylene fiber needled felt to be 850g/m2Air permeability of 11m3/m2/min。
Cutting the prepared needled felt into a 100cm area2The round piece is put into 0.01mol/L sodium dodecyl benzene sulfonate solution and is dispersed for 55min by ultrasonic.
2. Preparation of precursor solution of denitration and dioxin removal catalyst
Mixing 50 wt% Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing the O crystal, the polytetrafluoroethylene emulsion and the deionized water into a solution according to the mass ratio of (8-10) to (4-5) to (0.8-1) to (4-5). Stirring in a magnetic stirrer for 40 min.
The preparation method comprises the steps of preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water according to the mass ratio of 2:2:1:1:0.8:3, and stirring the mixture in a magnetic stirrer at the temperature of 60 ℃ for 70min until the ammonium metavanadate and the ammonium metatungstate are dissolved.
And (2) uniformly mixing the two mixed solutions according to the mass ratio of 1:1, adding a small amount of silane coupling agent, increasing the coupling effect among different components, and stirring in a magnetic stirrer for 20min to prepare the precursor solution of the denitration and dioxin removal catalyst.
In the above formulation, 50 wt% Mn (NO)3)2The solution is reduced into MnOx, and mainly plays a role in denitration catalysis; ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal is reduced into CeOx and CoOx, which is mainly used for catalysis promotion and is used for removing dioxin by concerted catalysis, and in addition, the Ce-Co-Ox (cerium and cobalt oxide) has certain sulfur resistance and can prevent the filter material from being caused by SO in the actual use process2And the resulting pasting of the bag; the ammonium metavanadate and the ammonium metatungstate are reduced into VOx and WOx which can act synergistically, so that the catalyst has good denitration and dioxin removal catalytic performance; the polytetrafluoroethylene emulsion mainly has the functions of thickening and increasing the load binding power of the catalyst; monoethanolamine and oxalic acid mainly act to dissolve ammonium metavanadate and ammonium metatungstate.
3. Impregnation of catalyst precursor solution
And (3) putting the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the precursor solution prepared in the step (2), and carrying out ultrasonic oscillation for 1-2h to fully impregnate the precursor solution into the needled felt. Then, the excessive liquid is rolled out by a compression roller, and the rolling residual ratio is kept at 150% by adjusting the compression roller pressure.
4. High temperature baking
And (4) putting the polytetrafluoroethylene needled felt circular sheet padded in the step (3) into a high-temperature air-blast oven. Because the polytetrafluoroethylene fiber needled felt cannot tolerate ultrahigh temperature, the gradient temperature needs to be set, part of catalyst precursor is converted into a catalyst finished product, the needled felt is protected, and then the temperature is raised for baking. The temperature setting program is: 250 deg.C (5min) -300 deg.C (5min) -350 deg.C (5min) -400 deg.C (5 min). After baking, the catalyst precursor is reduced into a Mn-V-W-Ce-Co-Ox multi-element catalyst, and the filter material (Mn-V-W-Ce-Co-Ox/PTFE filter material) with the functions of dedusting, denitrating and dioxin removing is obtained.
Comparative example
And (3) performance testing:
the Mn-V-W-Ce-Co-Ox/PTFE filter material prepared in the example 1 is subjected to filtration efficiency and denitration and dioxin removal tests.
The filtering performance of the Mn-V-W-Ce-Co-Ox/PTFE filter material with the dedusting, denitration and dioxin removal catalytic functions is tested on a static particulate matter filter. The test results are shown in table 1:
TABLE 1 static particulate matter filtration efficiency
As can be seen from Table 1:
the PM2.5 filtering efficiency of the Mn-V-W-Ce-Co-Ox/PTFE filtering material reaches 99.99 percent, which is higher than that of the common Polytetrafluoroethylene (PTFE) fiber needled felt, because the catalyst powder is fixed on the surface of the fiber, the pores between the fiber are reduced, and further the penetration of dust particles is prevented.
The denitration and dioxin removal catalytic performances of the Mn-V-W-Ce-Co-Ox/PTFE filter material are subjected to denitration and dioxin removal catalytic reactions on a fixed reaction bed, and the reaction mode is shown as the following figure 1.
Wherein, the dioxin is used for replacing the simulation test by chlorobenzene. The denitration catalytic efficiency takes the NO conversion rate as an index, the dioxin removal catalytic efficiency takes the chlorobenzene conversion rate as an index, and the test results are shown in table 2:
TABLE 2 denitration and dioxin removal catalytic efficiency
As can be seen from Table 2:
the highest NO removal efficiency is 92.6 percent (200 ℃), and the highest chlorobenzene removal efficiency is 81.3 percent (240 ℃).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A preparation method of a filtering material with the functions of dust removal, denitration and dioxin removal is characterized by comprising the following steps:
(1) preparing and treating a polytetrafluoroethylene fiber needled felt:
putting the polytetrafluoroethylene fibers into a bale opener, fully and uniformly mixing the polytetrafluoroethylene fibers by a cotton mixing box, opening the polytetrafluoroethylene fibers by a fine opener, and carding, cross lapping and needling the fibers to obtain a polytetrafluoroethylene fiber needled felt;
cutting the obtained polytetrafluoroethylene fiber needled felt into pieces with an area of 100cm2Putting the wafer into 0.01mol/L sodium dodecyl benzene sulfonate solution, and performing ultrasonic dispersion for 40-60min to obtain a polytetrafluoroethylene needled felt wafer;
(2) preparing a precursor solution of a denitration and dioxin removal catalyst:
adding Mn (NO)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2Preparing the O crystal, the polytetrafluoroethylene emulsion and the deionized water into a solution, and putting the solution into a magnetic stirrer to stir for 30-40min for later use;
preparing ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water into a solution, and putting the solution into a magnetic stirrer to stir for 60-90min until the ammonium metavanadate and the ammonium metatungstate are dissolved;
uniformly mixing the two mixed solutions, adding a silane coupling agent, stirring in a magnetic stirrer, and preparing into a precursor solution of the denitration and dioxin removal catalyst;
(3) impregnation of the catalyst precursor solution:
soaking the polytetrafluoroethylene needled felt wafer prepared in the step (1) into the denitration and dioxin-removal catalyst precursor solution prepared in the step (2);
(4) high-temperature baking:
and (4) placing the impregnated polytetrafluoroethylene needled felt wafer in the step (3) into an oven for gradient drying to obtain the filtering material with the functions of dedusting, denitration and dioxin removal.
2. The method for preparing the filter material with the functions of dedusting, denitrating and removing dioxin according to claim 1, characterized in that the fibers loosened in the step (1) are carded into single fiber nets by a carding machine, then are crossly lapped and layered, are firstly needled into a bottom surface by a needling machine, then are put into a base fabric, the steps are repeated to prepare a top surface, so that a complete needled felt is formed, and the needling density, the needling frequency and the needling depth of the needling machine are adjusted to ensure that the needled felt is soft.
3. The method for preparing the filter material with the functions of dedusting, denitrifying and removing dioxin in claim 2, characterized in that the gram weight of the polytetrafluoroethylene fiber needled felt obtained in the step (1) is controlled to be 850g/m2, and the air permeability is controlled to be 15-10m3/m2/min
4. The preparation method of the filter material with the functions of dedusting, denitrating and dioxin removing in the claim 1 is characterized in that in the step (3), the polytetrafluoroethylene needled felt wafer prepared in the step (1) is put into the precursor solution prepared in the step (2) for dipping, and ultrasonic vibration is carried out for 1-2h in the dipping process,
after ultrasonic treatment, excess liquid is rolled out by a compression roller, and the rolling residual rate is controlled to be kept at 150% by modulating the pressure of the compression roller.
5. The preparation method of the filter material with the functions of dedusting, denitrifying and removing dioxin in claim 1 is characterized in that the gradient drying mode in the step (4) is as follows:
oven drying at 250 deg.C for 5min, heating to 300 deg.C for 5min, heating to 350 deg.C for 5min, and heating to 400 deg.C for 5 min.
6. The method for preparing a filter material with functions of dedusting, denitrifying and removing dioxin according to claim 1, characterized in that the Mn (NO) is3)2The solution was 50 wt% Mn (NO)3)2And (3) solution.
7. The method for preparing the filter material with the functions of dedusting, denitrifying and removing dioxin in the claim 1, characterized in that the step (2) is put into a magnetic stirrer to be stirred for 20-30 min.
8. The method for preparing the filter material with the functions of removing dust, removing nitrate and removing dioxin in the claim 7 is characterized in that in the step (2), two mixed solutions are uniformly mixed according to the mass ratio of 1: 1.
9. The method for preparing a filter material with functions of dust removal, denitration and dioxin removal according to claim 1, wherein Mn (NO) is added in the step (2)3)2Solution, Ce (NO)3)3·6H2O crystal, CoCl2·6H2The O crystal, the polytetrafluoroethylene emulsion and the deionized water are as follows according to the mass ratio: (8-10) to (4-5) to (0.8-1) to (4-5) to prepare a solution;
ammonium metavanadate powder, ammonium metatungstate powder, monoethanolamine, oxalic acid, polytetrafluoroethylene emulsion and deionized water are mixed according to the mass ratio: (1-2): (2-3): 1-2): 0.8-1): 3-4.
10. The application of the preparation method of the filter material with the functions of dedusting, denitrifying and removing dioxin in any one of claims 1 to 9 in the preparation of the filter material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111213692.4A CN114130119B (en) | 2021-10-19 | 2021-10-19 | Preparation method and application of filter material with dust removal, denitration and dioxin removal functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111213692.4A CN114130119B (en) | 2021-10-19 | 2021-10-19 | Preparation method and application of filter material with dust removal, denitration and dioxin removal functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114130119A true CN114130119A (en) | 2022-03-04 |
| CN114130119B CN114130119B (en) | 2023-10-03 |
Family
ID=80394440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111213692.4A Active CN114130119B (en) | 2021-10-19 | 2021-10-19 | Preparation method and application of filter material with dust removal, denitration and dioxin removal functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114130119B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115006990A (en) * | 2022-06-15 | 2022-09-06 | 安徽元琛环保科技股份有限公司 | Preparation method of dedusting and dioxin-removing filter material |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340282A (en) * | 2002-05-22 | 2003-12-02 | Osaka Gas Co Ltd | Low temperature denitration catalyst, and low temperature denitration method for exhaust gas |
| CN104841489A (en) * | 2015-05-29 | 2015-08-19 | 山东爱亿普环保科技有限公司 | Rare-earth-based composite multi-component denitration and dioxin-removing catalyst and preparation method thereof |
| CN104998467A (en) * | 2015-07-02 | 2015-10-28 | 辽宁鸿盛环境技术集团股份有限公司 | Filter material with denitration and dioxin-removal effects and preparation method thereof |
| CN105013249A (en) * | 2015-07-02 | 2015-11-04 | 辽宁鸿盛环境技术集团股份有限公司 | Nitre and dioxin-removal PPS composite felt functional filtering material and preparation method thereof |
| CN105442305A (en) * | 2015-11-17 | 2016-03-30 | 安徽省元琛环保科技有限公司 | Preparation method of glass fiber filtering material with V-Mo-Ti denitration system |
| CN107876043A (en) * | 2017-11-24 | 2018-04-06 | 李建州 | A kind of ceramic catalytic filter core and flue gas integration desulfurization denitration dust removal method for gas cleaning |
| CN109876798A (en) * | 2019-03-12 | 2019-06-14 | 华侨大学 | A kind of V-Mn base low temperature SCR denitration catalyst and preparation method thereof |
| CN110841376A (en) * | 2019-11-27 | 2020-02-28 | 南通大学 | Ternary low-temperature catalytic denitration, desulfurization and dust removal integrated high-efficiency filter material and production method thereof |
| CN111714964A (en) * | 2020-06-29 | 2020-09-29 | 浙江严牌过滤技术股份有限公司 | Dedusting and dioxin removing integrated filter material and preparation method thereof |
| CN112169583A (en) * | 2020-09-22 | 2021-01-05 | 西安热工研究院有限公司 | Flue gas denitration method for waste incineration power plant |
| CN112704959A (en) * | 2020-11-23 | 2021-04-27 | 安徽元琛环保科技股份有限公司 | Preparation method of denitration and dedusting integrated filter material and prepared filter material |
| CN112717556A (en) * | 2020-11-30 | 2021-04-30 | 安徽元琛环保科技股份有限公司 | Preparation method of filtering material with functions of denitration and dioxin removal |
| US20220362746A1 (en) * | 2019-11-12 | 2022-11-17 | Nanjing Tech University | Integrated filter material and preparation method and application thereof |
-
2021
- 2021-10-19 CN CN202111213692.4A patent/CN114130119B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340282A (en) * | 2002-05-22 | 2003-12-02 | Osaka Gas Co Ltd | Low temperature denitration catalyst, and low temperature denitration method for exhaust gas |
| CN104841489A (en) * | 2015-05-29 | 2015-08-19 | 山东爱亿普环保科技有限公司 | Rare-earth-based composite multi-component denitration and dioxin-removing catalyst and preparation method thereof |
| CN104998467A (en) * | 2015-07-02 | 2015-10-28 | 辽宁鸿盛环境技术集团股份有限公司 | Filter material with denitration and dioxin-removal effects and preparation method thereof |
| CN105013249A (en) * | 2015-07-02 | 2015-11-04 | 辽宁鸿盛环境技术集团股份有限公司 | Nitre and dioxin-removal PPS composite felt functional filtering material and preparation method thereof |
| CN105442305A (en) * | 2015-11-17 | 2016-03-30 | 安徽省元琛环保科技有限公司 | Preparation method of glass fiber filtering material with V-Mo-Ti denitration system |
| CN107876043A (en) * | 2017-11-24 | 2018-04-06 | 李建州 | A kind of ceramic catalytic filter core and flue gas integration desulfurization denitration dust removal method for gas cleaning |
| CN109876798A (en) * | 2019-03-12 | 2019-06-14 | 华侨大学 | A kind of V-Mn base low temperature SCR denitration catalyst and preparation method thereof |
| US20220362746A1 (en) * | 2019-11-12 | 2022-11-17 | Nanjing Tech University | Integrated filter material and preparation method and application thereof |
| CN110841376A (en) * | 2019-11-27 | 2020-02-28 | 南通大学 | Ternary low-temperature catalytic denitration, desulfurization and dust removal integrated high-efficiency filter material and production method thereof |
| CN111714964A (en) * | 2020-06-29 | 2020-09-29 | 浙江严牌过滤技术股份有限公司 | Dedusting and dioxin removing integrated filter material and preparation method thereof |
| CN112169583A (en) * | 2020-09-22 | 2021-01-05 | 西安热工研究院有限公司 | Flue gas denitration method for waste incineration power plant |
| CN112704959A (en) * | 2020-11-23 | 2021-04-27 | 安徽元琛环保科技股份有限公司 | Preparation method of denitration and dedusting integrated filter material and prepared filter material |
| CN112717556A (en) * | 2020-11-30 | 2021-04-30 | 安徽元琛环保科技股份有限公司 | Preparation method of filtering material with functions of denitration and dioxin removal |
Non-Patent Citations (2)
| Title |
|---|
| "国家鼓励发展的重大环保技术装备目录(2011年版)", 设备管理与维修, no. 04 * |
| 张春粦等: "《垃圾焚烧发电应用技术及其安全分析》", 31 December 2019, pages: 178 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115006990A (en) * | 2022-06-15 | 2022-09-06 | 安徽元琛环保科技股份有限公司 | Preparation method of dedusting and dioxin-removing filter material |
| CN115006990B (en) * | 2022-06-15 | 2023-11-10 | 安徽元琛环保科技股份有限公司 | Preparation method of dedusting and dioxin removing filter material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114130119B (en) | 2023-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111318157B (en) | Preparation method, product and application of modified carbide slag desulfurization and denitrification agent | |
| CN110508274A (en) | Modification biological charcoal low-temperature denitration catalyst and its application | |
| CN114130119B (en) | Preparation method and application of filter material with dust removal, denitration and dioxin removal functions | |
| CN111229209B (en) | Lotus leaf source charcoal-loaded manganese oxide low-temperature SCR (selective catalytic reduction) flue gas denitration catalyst and preparation method and application thereof | |
| CN113083320A (en) | Low-temperature SCR denitration catalyst and preparation method thereof | |
| CN110508236A (en) | A kind of microwave cooperating processing waste residue prepares high-efficiency sintered flue gas adsorbent and method | |
| CN108355665A (en) | Energy simultaneous SO_2 and NO removal has spinel structure catalyst and its preparation method and application | |
| CN108479744A (en) | A kind of preparation method and applications of desulphurization catalyst | |
| CN113663416B (en) | Load type PTFE fiber filter material and preparation method thereof | |
| CN106731234B (en) | A kind of preparation method of binary denitration sulfur resistant catalyst composite filtering material | |
| CN114558449A (en) | Preparation method and application of flue gas denitration agent | |
| CN106925034B (en) | A kind of preparation method of denitration function polyphenylene sulfide composite filtering material | |
| CN110961114A (en) | Desulfurization and denitrification catalyst and preparation method thereof | |
| CN109762624A (en) | A kind of high activity coal combustion catalyst and preparation method thereof | |
| CN108262049B (en) | Modified low-temperature SCO denitration catalyst and preparation method thereof | |
| CN109762623A (en) | A kind of and demercuration coal combustion catalyst and preparation method thereof | |
| CN112044176B (en) | NO catalytic oxidation filter bag for rapid SCR reaction and preparation method thereof | |
| CN101767041A (en) | Preparation method of flue gas denitration catalyst | |
| CN114130118A (en) | Preparation method and application of three-in-one filtering material for denitration, dioxin removal and dust removal | |
| CN112604694A (en) | Novel low-temperature water-resistant sulfur-resistant NH taking low-cost fly ash as carrier3-SCR catalyst | |
| CN105195153B (en) | A kind of method that desulphurization catalyst is prepared using peanut shell | |
| CN109647385A (en) | Carbon monoxide catalyst and preparation method thereof in a kind of removing flue gas | |
| CN113332954B (en) | Sintered flue gas denitration adsorbent and preparation method and application thereof | |
| CN117563631B (en) | Hydrolysis catalyst for blast furnace gas fine desulfurization, preparation method and application | |
| CN115770571A (en) | Copper-based catalyst-loaded sludge activated carbon and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |