CN110639503A - SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof - Google Patents

SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof Download PDF

Info

Publication number
CN110639503A
CN110639503A CN201910923248.8A CN201910923248A CN110639503A CN 110639503 A CN110639503 A CN 110639503A CN 201910923248 A CN201910923248 A CN 201910923248A CN 110639503 A CN110639503 A CN 110639503A
Authority
CN
China
Prior art keywords
scr
wire mesh
mesh
dimensional hollow
tio
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.)
Pending
Application number
CN201910923248.8A
Other languages
Chinese (zh)
Inventor
翟旭
高明
李艳秋
王琛
陈红瑞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Car Environmental Technology Co Ltd
Original Assignee
China Car Environmental Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Car Environmental Technology Co Ltd filed Critical China Car Environmental Technology Co Ltd
Priority to CN201910923248.8A priority Critical patent/CN110639503A/en
Publication of CN110639503A publication Critical patent/CN110639503A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • 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
    • 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
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/30—Tungsten
    • 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
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

Abstract

The invention provides an SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and a preparation method thereof, and relates to the field of SCR catalysts. Comprises a metal wire mesh, a carrier and an active component loaded on the carrier; the wire mesh is of a three-dimensional transparent structure, and the carrier is Al2O3And TiO2The active component is V2O5And WoO3(ii) a The active component accounts for 1-10% of the mass of the carrier. The catalyst has the advantages of good catalytic performance, low cost, good thermal shock resistance, good mass transfer performance and quick thermal response.

Description

SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof
Technical Field
The invention relates to the technical field of SCR catalysts, in particular to an SCR special-shaped three-dimensional hollow screen catalyst and a preparation method thereof.
Background
Pollution of the atmosphere by nitrogen oxides (NOx) is a worldwide environmental problem, and its effects on the atmosphere are mainly acid rain and high ground ozone concentrations. The NOx emission in China is estimated to be more than 1000 million tons, and the NOx emission will continuously increase along with the continuous increase of economic development. Methods for NOx pollution control in industrial waste gases can be divided into two broad categories: preventing the generation of NOx and removing the NOx. Common methods for preventing NOx generation are low NOx combustion technology and boiler retrofit technology. Common approaches to NOx removal are selective non-catalytic reduction (SNCR) and Selective Catalytic Reduction (SCR), where SCR process technology is one of the mainstream technologies for future NOx control due to high efficiency, high selectivity and high economy.
At present, the commonly used catalysts in the SCR process technology comprise a powder catalyst and a honeycomb cordierite catalyst, but the problems of poor thermal shock resistance, poor mass transfer performance and slow thermal response exist, and the catalyst is easy to be deactivated by blocking a pore channel by dust and fly ash, so that the catalytic performance is poor and the treatment cost is increased.
Disclosure of Invention
In view of the above problems and disadvantages, the present invention provides an SCR irregular three-dimensional hollow screen catalyst and a method for preparing the same.
In order to achieve the purpose, the invention provides the following technical scheme:
SCR heterotypic three-dimensional hollow screen cloth catalyst, its characterized in that: comprises a metal wire mesh, a carrier and an active component loaded on the carrier; the metal wire mesh is of a three-dimensional transparent structure, and the carrier is Al2O3And TiO2The active component is V2O5And WoO3(ii) a The active component accounts for 1-10% of the mass of the carrier.
Further, Al in the carrier2O3And TiO2The weight ratio of (A) to (B) is 10-25: 75-90.
Further, said V in the catalyst2O5And WoO3The molar ratio is 1-4: 3-12.
The preparation method of the SCR special-shaped three-dimensional hollow screen catalyst comprises the following steps:
s1, mixing 500-1000 parts by mass of absolute ethyl alcohol, 0.2-1 part by mass of aluminum isopropoxide and 5-12 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 4-5 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 1-5 min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for not less than 10h, sintering at 700-900 ℃ in nitrogen atmosphere for 8-12 h, cooling to room temperature in a furnace, taking out, roasting at 400-600 ℃ in air atmosphere for 6-10 h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3Wire mesh on TiO2Dipping and pulling the sol for 1 to 8 times, drying the sol at the temperature of between 80 and 100 ℃, and roasting the dried sol at the temperature of between 400 and 600 ℃ for 4 to 8 hours to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3The method comprises the steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the mesh into a mixed solution composed of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1-2: 4-6: 100-200, dipping and lifting for 1-8 times, taking out the mesh, drying the mesh at room temperature for 24 hours, and roasting the mesh at 400-600 ℃ for 4-8 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
Further, before S1, S01, respectively pretreating the wire mesh and the pure aluminum powder;
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 80-90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃; the pretreatment removes stains and grease from the surface of the wire mesh and imparts roughness to the surface of the wire.
And (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying. The pretreatment removes the oxide layer of pure aluminum powder.
Further, in S1, 550 parts by mass of absolute ethyl alcohol, 1 part by mass of aluminum isopropoxide and 10 parts by mass of pure aluminum powder were mixed, and subjected to ultrasonic oscillation for 4.5 hours to obtain an electrophoretic fluid.
Further, in S3, the cathode is taken out after deposition, dried at room temperature for 12h, sintered at 800 ℃ in nitrogen atmosphere for 10h, cooled to room temperature in the furnace and taken out, baked at 500 ℃ in air atmosphere for 8h, cooled to room temperature in the furnace and taken out to obtain Al2O3A wire mesh.
Further, in S4, Al is added2O3Wire mesh on TiO2Dipping and lifting the sol for 5 times, drying the sol at 90 ℃, and roasting the dried sol at 500 ℃ for 6 hours to obtain TiO2/Al2O3A wire mesh.
Further, in S5, TiO is added2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1.8: 4.5: 100 for dipping and pulling for 4 times, taking out the metal screen mesh, drying the metal screen mesh at room temperature for 24 hours, and roasting the metal screen mesh at the temperature of 500 ℃ for 5 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
Further, in S5, TiO is added2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1.2: 5.5: 200 for dipping and pulling for 2 times, taking out the metal screen mesh, drying the metal screen mesh at room temperature for 24 hours, and roasting the metal screen mesh at the temperature of 500 ℃ for 6 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
Further, in S5, the mass concentration of the oxalic acid solution is 4-6%. Preferably, the oxalic acid solution has a mass concentration of 5%.
The SCR special-shaped three-dimensional hollow screen catalyst and the preparation method thereof have the beneficial effects that: the metal wire mesh is a stainless steel wire mesh, has a three-dimensional transparent structure and geometric deformability, and the prepared catalyst has a three-dimensional structure, so that the pore passage is not easily blocked by dust and fly ash, the catalytic performance is good, and the treatment cost is low. Secondly, the invention applies an electrophoretic deposition method to prepare Al on a stainless steel wire mesh substrate2O3Of carriersThe method has the advantages of high vanadium-based species concentration in the catalyst component, high heat transfer efficiency of the stainless steel wire mesh, difficulty in blocking and the like, so that the final catalytic performance is improved, the thermal shock resistance is improved by 30-50%, the mass transfer performance is improved by 20-45%, and the thermal response is rapid.
In addition, because the catalyst takes the stainless steel mesh as a substrate, Al is fully utilized2O3Surface area provided to disperse the catalytically active material, TiO2The loading and the concentration of catalytically active species determine the catalytic performance. In the catalyst TiO2In anatase form, the active component is present in amorphous or small crystalline form, the ratio of the adsorbed oxygen to the lattice oxygen content being close to 1: 1, the catalyst has good heat dispersibility on a carrier, is uniformly distributed in a single layer, and obtains high catalytic activity, so the catalyst has the characteristics of low cost, small pressure drop, good mass transfer performance, quick thermal response and the like. The SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and can remove 95% of NO at the maximum under the condition of 350 ℃ through testing.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment of the invention, the SCR heterotype three-dimensional hollow screen catalyst comprises a metal wire mesh, a carrier and an active component loaded on the carrier; the wire mesh is of a three-dimensional transparent structure, and the carrier is Al2O3And TiO2The active component is V2O5And WoO3(ii) a The active component accounts for 1-10% of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 10-25: 75-90. The above V in the catalyst2O5And WoO3The molar ratio is 1-4: 3-12.
In another embodiment of the present invention, a method for preparing the SCR heterotype three-dimensional hollow screen catalyst is provided, which comprises the following steps:
s01, respectively pretreating the wire mesh and the pure aluminum powder;
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 80-90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃; the pretreatment removes stains and grease from the surface of the wire mesh and imparts roughness to the surface of the wire.
And (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying. The pretreatment removes the oxide layer of pure aluminum powder.
S1, mixing 500-1000 parts by mass of absolute ethyl alcohol, 0.2-1 part by mass of aluminum isopropoxide and 5-12 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 4-5 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 1-5 min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for not less than 10h, sintering at 700-900 ℃ in nitrogen atmosphere for 8-12 h, cooling to room temperature in a furnace, taking out, roasting at 400-600 ℃ in air atmosphere for 6-10 h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3Wire mesh on TiO2Dipping and pulling the sol for 1 to 8 times, taking out and drying the sol, and roasting the sol for 4 to 8 hours at the temperature of between 400 and 600 ℃ to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3Weaving a metal wire mesh into a honeycomb-shaped metal screen mesh, and placing the metal screen mesh in a solution prepared from ammonium metavanadate, ammonium tungstate and oxalic acidDipping and pulling the mixed solution in a mass ratio of 1-2: 4-6: 100-200 for 1-8 times, wherein the mass concentration of the oxalic acid solution is 4-6%, taking out, drying at room temperature for 24h, and roasting at 400-600 ℃ for 4-8 h to obtain the SCR special-shaped three-dimensional hollow screen catalyst.
The invention is further illustrated by the following specific examples.
Example 1
In this embodiment, the preparation method of the SCR special-shaped three-dimensional hollow screen catalyst includes the following steps:
s01, respectively preprocessing the wire mesh and the pure aluminum powder;
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃; the pretreatment removes stains and grease on the surface of the metal wire mesh and makes the surface of the metal wire have roughness;
and (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying. The pretreatment removes the oxide layer of pure aluminum powder.
S1, mixing 1000 parts by mass of absolute ethyl alcohol, 1 part by mass of aluminum isopropoxide and 12 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 4 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 1min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for 12h, sintering at 800 ℃ in nitrogen atmosphere for 10h, cooling to room temperature in the furnace, taking out, roasting at 500 ℃ in air atmosphere for 8h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3MetalScreen on TiO2Dipping and pulling the sol for 2 times, taking out the sol, drying the sol at 90 ℃, and then roasting the sol for 6 hours at 600 ℃ to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 15: 100 for dipping and pulling for 1 time, taking out the metal screen mesh, drying the metal screen mesh at room temperature for 24 hours, and then roasting the metal screen mesh at 500 ℃ for 5 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
In the SCR special-shaped three-dimensional hollow screen catalyst obtained in the embodiment, the active component accounts for 4% of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 15: 80. The above V in the catalyst2O5And WoO3The molar ratio is 2: 5. The thermal shock resistance is improved by 46.5 percent and the mass transfer performance is improved by 43.2 percent through tests; the obtained SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and 88% of NO can be removed under the condition of 350 ℃ through tests.
Example 2
In this embodiment, the preparation method of the SCR special-shaped three-dimensional hollow screen catalyst includes the following steps:
s01, respectively preprocessing the wire mesh and the pure aluminum powder;
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃; the pretreatment removes stains and grease on the surface of the metal wire mesh and makes the surface of the metal wire have roughness;
and (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying. The pretreatment removes the oxide layer of pure aluminum powder.
S1, mixing 550 parts by mass of absolute ethyl alcohol, 1 part by mass of aluminum isopropoxide and 10 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 4.5 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 2min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for 12h, sintering at 700 ℃ in nitrogen atmosphere for 12h, cooling to room temperature in the furnace, taking out, roasting at 600 ℃ in air atmosphere for 6h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3Wire mesh on TiO2Dipping and lifting the sol for 5 times, drying the sol at 90 ℃, and roasting the dried sol at 500 ℃ for 8 hours to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1.2: 5.5: 200 for dipping and pulling for 2 times, taking out the metal screen mesh, drying the metal screen mesh at room temperature for 24 hours, and roasting the metal screen mesh at the temperature of 500 ℃ for 4 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
In the SCR special-shaped three-dimensional hollow screen catalyst obtained in the embodiment, the active component accounts for 5% of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 18: 85. The above V in the catalyst2O5And WoO3The molar ratio is 3: 7. The thermal shock resistance is improved by 47.5 percent and the mass transfer performance is improved by 44.8 percent through tests; the obtained SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and tests show that 95% of NO can be removed under the condition of 350 ℃.
Example 3
In this embodiment, the preparation method of the SCR special-shaped three-dimensional hollow screen catalyst includes the following steps:
s01, respectively preprocessing the wire mesh and the pure aluminum powder;
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃; the pretreatment removes stains and grease on the surface of the metal wire mesh and makes the surface of the metal wire have roughness;
and (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying. The pretreatment removes the oxide layer of pure aluminum powder.
S1, mixing 800 parts by mass of absolute ethyl alcohol, 0.8 part by mass of aluminum isopropoxide and 12 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 5 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 5min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for 12h, sintering at 900 ℃ in nitrogen atmosphere for 8h, cooling to room temperature in the furnace, taking out, roasting at 4000 ℃ in air atmosphere for 10h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3Wire mesh on TiO2Dipping and lifting the sol for 6 times, drying the sol at 90 ℃, and roasting the dried sol at 400 ℃ for 8 hours to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1.4: 4.8: 150 for dipping and pulling for 4 times, taking out the metal screen mesh, drying the metal screen mesh at room temperature for 24 hours, and then placing the metal screen mesh at 600 ℃ for roasting for 4 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
The SCR special-shaped three-dimensional hollow screen catalyst obtained in the exampleThe mass of the active component is 8 percent of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 20: 85. The above V in the catalyst2O5And WoO3The molar ratio is 4: 10. The thermal shock resistance is improved by 44.5 percent and the mass transfer performance is improved by 45.2 percent through tests; the obtained SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and tests show that 92% of NO can be removed under the condition of 350 ℃.
Example 4
In the preparation method of this example:
in S1, 650 parts by mass of absolute ethyl alcohol, 0.45 part by mass of aluminum isopropoxide and 7 parts by mass of pure aluminum powder are mixed, and the mixture is subjected to ultrasonic oscillation for 5 hours to obtain an electrophoresis solution;
in S5, adding TiO2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and an oxalic acid solution according to the mass ratio of 1.6: 6: 180, dipping and lifting for 5 times, taking out the oxalic acid solution with the mass concentration of 4.5%, drying the solution at room temperature for 24 hours, and then placing the dried solution at 600 ℃ for roasting for 6 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
The rest of the procedure was the same as in example 2.
In the SCR special-shaped three-dimensional hollow screen catalyst obtained in the embodiment, the active component accounts for 2% of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 23: 90. The above V in the catalyst2O5And WoO3The molar ratio is 1: 4. The thermal shock resistance is improved by 44.5 percent and the mass transfer performance is improved by 45.2 percent through tests; the obtained SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and 85% of NO can be removed under the condition of 350 ℃ through tests.
Example 5
In the preparation method of this example:
in S1, 900 parts by weight of absolute ethyl alcohol, 0.3 part by weight of aluminum isopropoxide and 10 parts by weight of pure aluminum powder are mixed, and the mixture is subjected to ultrasonic oscillation for 5 hours to obtain an electrophoresis solution;
in S5, adding TiO2/Al2O3The method comprises the following steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the metal screen mesh into a mixed solution consisting of ammonium metavanadate, ammonium tungstate and an oxalic acid solution according to the mass ratio of 2: 4.5: 130, dipping and lifting for 4 times, taking out the oxalic acid solution with the mass concentration of 4%, drying the oxalic acid solution at room temperature for 24 hours, and roasting the oxalic acid solution at 500 ℃ for 8 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
The rest of the procedure was the same as in example 2.
In the SCR special-shaped three-dimensional hollow screen catalyst obtained in the embodiment, the active component accounts for 2% of the mass of the carrier. Al in carrier2O3And TiO2The weight ratio of (A) to (B) is 17: 80. The above V in the catalyst2O5And WoO3The molar ratio is 2: 9. The thermal shock resistance is improved by 44.5 percent and the mass transfer performance is improved by 45.2 percent through tests; the obtained SCR special-shaped three-dimensional hollow screen catalyst is used in the SCR process technology, and 90% of NO can be removed under the condition of 350 ℃ through tests.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a three-dimensional hollow screen cloth catalyst of SCR abnormal shape which characterized in that: comprises a metal wire mesh, a carrier and an active component loaded on the carrier; the metal wire mesh is of a three-dimensional transparent structure, and the carrier is Al2O3And TiO2The active component is V2O5And WoO3(ii) a The active component accounts for 1-10% of the mass of the carrier.
2. The SCR profiled three-dimensional hollow mesh catalyst of claim 1, wherein: al in carrier2O3And TiO2The weight ratio of (A) to (B) is 10-25: 75-90.
3. The SCR profiled three-dimensional hollow screen catalyst according to claim 1 or 2, characterized in that: said V in the catalyst2O5And WoO3The molar ratio is 1-4: 3-12.
4. The method for preparing an SCR heterotype three-dimensional hollow screen catalyst according to any one of claims 1 to 3, comprising the steps of:
s1, mixing 500-1000 parts by mass of absolute ethyl alcohol, 0.2-1 part by mass of aluminum isopropoxide and 5-12 parts by mass of pure aluminum powder, and performing ultrasonic oscillation for 4-5 hours to obtain an electrophoresis solution;
s2, injecting the electrophoretic solution into an electrophoresis tank, carrying out electrophoretic deposition for 1-5 min by taking a metal wire mesh as a cathode and graphite as an anode, wherein the distance between the two electrodes is 10 mm;
s3, taking out the cathode after deposition, drying at room temperature for not less than 10h, sintering at 700-900 ℃ in nitrogen atmosphere for 8-12 h, cooling to room temperature in a furnace, taking out, roasting at 400-600 ℃ in air atmosphere for 6-10 h, cooling to room temperature in the furnace, and taking out to obtain Al2O3A wire mesh;
s4, mixing Ti (OC)4H9)4、C2H5OH and H2Mixing O according to the volume ratio of 4: 16: 1 to obtain TiO2Sol and then adding Al2O3Wire mesh on TiO2Dipping and pulling the sol for 1 to 8 times, drying the sol at the temperature of between 80 and 100 ℃, and roasting the dried sol at the temperature of between 400 and 600 ℃ for 4 to 8 hours to obtain TiO2/Al2O3A wire mesh;
s5, mixing TiO2/Al2O3The method comprises the steps of weaving a metal wire mesh into a honeycomb metal screen mesh, then placing the mesh into a mixed solution composed of ammonium metavanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1-2: 4-6: 100-200, dipping and lifting for 1-8 times, taking out the mesh, drying the mesh at room temperature for 24 hours, and roasting the mesh at 400-600 ℃ for 4-8 hours to obtain the SCR irregular three-dimensional hollow screen mesh catalyst.
5. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: before S1, the method further comprises S01 that the wire mesh and the pure aluminum powder are respectively pretreated:
h with the mass concentration of 10% is adopted for the wire mesh2SO4Cleaning the solution at 80-90 ℃, then washing the wire mesh with deionized water until the pH value of effluent water is 7, and drying for 1h at 100 ℃;
and (3) cleaning the pure aluminum powder by using a 1 wt% ammonia solution, then washing the pure aluminum powder by using deionized water until the pH value of effluent water is 7, and naturally drying.
6. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: in S1, 550 parts by mass of absolute ethyl alcohol, 1 part of aluminum isopropoxide and 10 parts of pure aluminum powder are mixed, and subjected to ultrasonic oscillation for 4.5 hours to obtain an electrophoretic fluid.
7. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: in S3, the cathode is taken out after deposition, dried for 12h at room temperature, sintered for 10h at 800 ℃ in nitrogen atmosphere, cooled to room temperature in furnace and taken out, baked for 8h at 500 ℃ in air atmosphere and cooled to room temperature in furnace and taken out to obtain Al2O3A wire mesh.
8. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: in S4, Al is added2O3Wire mesh on TiO2Dipping and lifting the sol for 5 times, drying the sol at 90 ℃, and roasting the dried sol at 500 ℃ for 6 hours to obtain TiO2/Al2O3A wire mesh.
9. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: in S5, adding TiO2/Al2O3Weaving metal wire mesh into honeycomb metal screen mesh, and placing the metal screen mesh on a deflection plateDipping and pulling for 2 times in a mixed solution consisting of ammonium vanadate, ammonium tungstate and oxalic acid solution according to the mass ratio of 1.2: 5.5: 200, taking out, drying at room temperature for 24 hours, and roasting at 500 ℃ for 6 hours to obtain the SCR special-shaped three-dimensional hollow screen catalyst.
10. The method for preparing the SCR heterotype three-dimensional hollow screen catalyst according to the claim 4, characterized in that: in S5, the mass concentration of the oxalic acid solution is 4-6%.
CN201910923248.8A 2019-09-27 2019-09-27 SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof Pending CN110639503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910923248.8A CN110639503A (en) 2019-09-27 2019-09-27 SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910923248.8A CN110639503A (en) 2019-09-27 2019-09-27 SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof

Publications (1)

Publication Number Publication Date
CN110639503A true CN110639503A (en) 2020-01-03

Family

ID=68992890

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910923248.8A Pending CN110639503A (en) 2019-09-27 2019-09-27 SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof

Country Status (1)

Country Link
CN (1) CN110639503A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010004452A1 (en) * 1998-05-29 2001-06-21 Wieland Mathes Method for cleaning diesel engine exhaust gas
CN1792431A (en) * 2006-01-13 2006-06-28 清华大学 Integral denitration catalyst using double-oxide as composite carrier and its prepn. method
CN101391214A (en) * 2008-11-07 2009-03-25 哈尔滨工业大学 Cellular metal screen catalyst for selective catalytic reduction of nitrogen oxide and preparation method thereof
CN102166515A (en) * 2011-03-01 2011-08-31 大连理工大学 Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof
CN102284283A (en) * 2010-06-18 2011-12-21 上海牛翼新能源科技有限公司 Flue gas denitrification titanium oxide load-type vanadium-tungsten composite oxide integral-type catalyst

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010004452A1 (en) * 1998-05-29 2001-06-21 Wieland Mathes Method for cleaning diesel engine exhaust gas
CN1792431A (en) * 2006-01-13 2006-06-28 清华大学 Integral denitration catalyst using double-oxide as composite carrier and its prepn. method
CN101391214A (en) * 2008-11-07 2009-03-25 哈尔滨工业大学 Cellular metal screen catalyst for selective catalytic reduction of nitrogen oxide and preparation method thereof
CN102284283A (en) * 2010-06-18 2011-12-21 上海牛翼新能源科技有限公司 Flue gas denitrification titanium oxide load-type vanadium-tungsten composite oxide integral-type catalyst
CN102166515A (en) * 2011-03-01 2011-08-31 大连理工大学 Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof

Similar Documents

Publication Publication Date Title
CN102974368B (en) Deactivated SCR denitration catalyst regeneration method
CN110354914B (en) Recycling method of inactivated SCR denitration catalyst
CN108620058B (en) Wide-temperature range denitration catalyst and preparation method thereof
CN105214647A (en) Coating type V is prepared by slurry impregnation 2o 5-WO 3-TiO 2-SiO 2the method of catalyst
WO2019076090A1 (en) Supported vocs catalytic combustion catalyst and preparation method therefor
CN101804344A (en) Manganese/carbon nanotube denitrification catalytic reduction catalyst and preparation method thereof
CN105688888A (en) High-performance vanadium, cerium and titanium composite oxide catalyst for flue gas denitration and preparation method thereof
CN103611535A (en) Preparation method of copper-foam-based hierarchical composite oxide monolithic denitrification catalyst
CN103801325A (en) Co-precipitation preparation method of composite oxide denitration catalyst
CN111001430A (en) Adsorption/catalysis material for waste gas treatment and preparation method thereof
CN103433081B (en) Regeneration method for honeycomb type SCR (Selective Catalytic Reduction) denitration catalyst
CN110918094A (en) Halogenated volatile organic compound catalytic combustion powder catalyst, preparation method thereof and preparation method of honeycomb ceramic monolithic catalyst
CN108187665B (en) Denitration catalyst and preparation method thereof
CN110354915B (en) Recycling method of alkali metal poisoned SCR denitration catalyst
CN101391214A (en) Cellular metal screen catalyst for selective catalytic reduction of nitrogen oxide and preparation method thereof
CN109894108A (en) A kind of efficient cryogenic SCR denitration
CN110639503A (en) SCR (Selective catalytic reduction) special-shaped three-dimensional hollow screen catalyst and preparation method thereof
CN108579731A (en) A kind of preparation method of low-temperature denitration carbon-supported catalysts
CN105148961A (en) SCR flue gas denitrification catalyst and preparation method therefor
CN108671965B (en) Semicoke low-temperature SCR denitration catalyst and preparation method thereof
CN108262049B (en) Modified low-temperature SCO denitration catalyst and preparation method thereof
CN106378201A (en) Preparation method of denitration catalyst adopting active carbon-TiO2 as carrier
CN104043449B (en) Based on new type low temperature SCR catalyst and the preparation method of cubic phase zircite carrier
CN113578333B (en) Low-temperature denitration catalyst and preparation method and application thereof
CN205760612U (en) The preparation system of denitrating catalyst

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
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200103