CN112108143A - Ultra-high temperature denitration catalyst - Google Patents
Ultra-high temperature denitration catalyst Download PDFInfo
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- CN112108143A CN112108143A CN202011031006.7A CN202011031006A CN112108143A CN 112108143 A CN112108143 A CN 112108143A CN 202011031006 A CN202011031006 A CN 202011031006A CN 112108143 A CN112108143 A CN 112108143A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 84
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000000843 powder Substances 0.000 claims abstract description 46
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 36
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 30
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 21
- 229920000742 Cotton Polymers 0.000 claims abstract description 20
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 20
- -1 rare earth compound Chemical class 0.000 claims abstract description 19
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 18
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 18
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000008117 stearic acid Substances 0.000 claims abstract description 18
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 17
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 17
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 17
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 17
- 239000012266 salt solution Substances 0.000 claims description 15
- 229910052684 Cerium Inorganic materials 0.000 claims description 12
- 229910052779 Neodymium Inorganic materials 0.000 claims description 12
- 229910052772 Samarium Inorganic materials 0.000 claims description 12
- 229910052746 lanthanum Inorganic materials 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 10
- 230000001376 precipitating effect Effects 0.000 claims description 10
- 239000012716 precipitator Substances 0.000 claims description 10
- 238000004537 pulping Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 7
- 229920001131 Pulp (paper) Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 2
- 239000011541 reaction mixture Substances 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
- 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
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- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
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- 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
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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- 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
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
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- 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
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
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- 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
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
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- 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
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Abstract
The invention relates to the technical field of catalysts, and discloses an ultrahigh-temperature denitration catalyst which comprises the following raw materials in parts by weight: 75-100 parts of titanium dioxide, 9-15 parts of tungsten trioxide, 1.5-3 parts of vanadium pentoxide, 3-6 parts of aramid fiber, 4-6 parts of pulp cotton, 2-5 parts of stearic acid, 4-7 parts of aluminum oxide, 3-8 parts of zirconium dioxide, 5-10 parts of titanium dioxide, 6-12 parts of magnesium oxide and 4-8 parts of rare earth compound; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps: selecting titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, pulp cotton and stearic acid to perform hydrothermal reaction, drying, and roasting at 300-600 ℃ to obtain solid powder; selecting and using alumina. The invention improves the high temperature resistance and the compressive strength of the catalyst, prolongs the service life of the catalyst, improves the catalytic efficiency of the catalyst, and is suitable for popularization and use.
Description
Technical Field
The invention relates to the technical field of catalysts, in particular to an ultrahigh-temperature denitration catalyst.
Background
The denitration catalyst generally refers to a catalyst applied to a denitration system of a power plant, and is a substance which promotes a reducing agent to selectively react with nitrogen oxides in flue gas at a certain temperature in a reaction. When the existing denitration catalyst is used at a high temperature, the catalytic efficiency is poor, the denitration catalyst is invalid due to the high temperature, and in most cases, the used catalyst is a solid catalyst, the high-temperature resistance of the catalyst is poor, and the service life of the catalyst is short, so that the problem is solved by the ultra-high-temperature denitration catalyst.
Disclosure of Invention
The ultrahigh-temperature denitration catalyst provided by the invention solves the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ultrahigh-temperature denitration catalyst comprises the following raw materials in parts by weight: 75-100 parts of titanium dioxide, 9-15 parts of tungsten trioxide, 1.5-3 parts of vanadium pentoxide, 3-6 parts of aramid fiber, 4-6 parts of pulp cotton, 2-5 parts of stearic acid, 4-7 parts of aluminum oxide, 3-8 parts of zirconium dioxide, 5-10 parts of titanium dioxide, 6-12 parts of magnesium oxide and 4-8 parts of rare earth compound; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps:
s1, carrying out hydrothermal reaction on titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, paper pulp cotton and stearic acid, drying, and roasting at 300-600 ℃ to obtain solid powder;
s2, selecting and using 5-10 parts of titanium dioxide, 5-10 parts of aluminum oxide, zirconium dioxide and 6-12 parts of magnesium oxide to be modified by rare earth compounds, uniformly mixing, drying and roasting to obtain first-stage carrier powder, wherein the roasting temperature is 300-;
s3, mixing and pulping the primary carrier powder and a salt solution corresponding to the primary carrier powder, then precipitating the salt solution by using a precipitator, filtering, washing, drying and roasting to obtain secondary carrier powder, wherein the roasting temperature is 500-800 ℃;
s4, mixing and pulping the secondary carrier powder and a salt solution of La, Ce, Nd or Sm, then precipitating the La, Ce, Nd or Sm by using a precipitator, and filtering, washing, drying and calcining to obtain high-temperature-resistant catalyst carrier powder;
s5, dissolving the solid powder obtained in the step S1 to prepare a solution, adding the high-temperature-resistant catalyst carrier powder prepared in the step S4 to dissolve and mix, and drying and roasting to prepare the ultra-high temperature denitration catalyst. .
Preferably, the feed comprises the following raw materials in parts by weight: 80-100 parts of titanium dioxide, 12-15 parts of tungsten trioxide, 2-3 parts of vanadium pentoxide, 4-6 parts of aramid fiber, 4.5-6 parts of pulp cotton, 3-5 parts of stearic acid, 5-7 parts of aluminum oxide, 4-8 parts of zirconium dioxide, 6-10 parts of titanium dioxide, 7-12 parts of magnesium oxide and 5-8 parts of rare earth compound.
Preferably, 75-90 parts of titanium dioxide, 9-12 parts of tungsten trioxide, 1.5-2.5 parts of vanadium pentoxide, 3-5 parts of aramid fiber, 4-5 parts of pulp cotton, 2-4 parts of stearic acid, 4-6 parts of aluminum oxide, 3-7 parts of zirconium dioxide, 5-9 parts of titanium dioxide, 6-10 parts of magnesium oxide and 4-7 parts of rare earth compound.
Preferably, 85 parts of titanium dioxide, 10 parts of tungsten trioxide, 2.5 parts of vanadium pentoxide, 4.5 parts of aramid fiber, 5 parts of pulp cotton, 3.5 parts of stearic acid, 5.5 parts of aluminum oxide, 5 parts of zirconium dioxide, 7.5 parts of titanium dioxide, 9 parts of magnesium oxide and 6 parts of rare earth compound.
Preferably, in S1, the pH of the hydrothermal reaction mixture is 10 to 12.
Preferably, in the S5, the drying temperature is 80-120 ℃, the drying time is 2.3-3h, and the roasting temperature is 200-300 ℃.
Preferably, in the S6, the high-temperature-resistant catalyst carrier is obtained by molding according to the need, and inert gas N2 or He is introduced during calcination, wherein the calcination temperature is 900-1200 ℃.
Preferably, in the step S4, the modifier is obtained by modifying a rare earth compound, and the modifier rare earth elements are rare earth oxides such as La, Ce, Nd, Sm and the like.
The invention has the beneficial effects that:
the catalyst is prepared by mixing the high-temperature-resistant catalyst carrier and the catalyst, so that the catalyst can exert high-efficiency catalytic efficiency in a high-temperature environment, the catalyst is prevented from losing effectiveness, and the service life of the catalyst is prolonged.
The aramid fiber is added into the denitration catalyst, so that the strength and compressive strength of the catalyst are improved, and the service life of the catalyst is prolonged; the porosity of the catalyst is increased by adding the pulp cotton. Thereby improving the catalytic efficiency of the catalyst.
The invention improves the high temperature resistance and the compressive strength of the catalyst, prolongs the service life of the catalyst, improves the catalytic efficiency of the catalyst, and is suitable for popularization and use.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
The ultrahigh-temperature denitration catalyst comprises the following raw materials in parts by weight: 75 parts of titanium dioxide, 9 parts of tungsten trioxide, 1.5 parts of vanadium pentoxide, 3 parts of aramid fiber, 4 parts of pulp cotton, 2 parts of stearic acid, 4 parts of aluminum oxide, 3 parts of zirconium dioxide, 5 parts of titanium dioxide, 6 parts of magnesium oxide and 4 parts of rare earth compounds; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps:
s1, carrying out hydrothermal reaction on titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, paper pulp cotton and stearic acid, drying, and roasting at 300-600 ℃ to obtain solid powder;
s2, selecting and using 5-10 parts of titanium dioxide, 5-10 parts of aluminum oxide, zirconium dioxide and 6-12 parts of magnesium oxide to be modified by rare earth compounds, uniformly mixing, drying and roasting to obtain first-stage carrier powder, wherein the roasting temperature is 300-;
s3, mixing and pulping the primary carrier powder and a salt solution corresponding to the primary carrier powder, then precipitating the salt solution by using a precipitator, filtering, washing, drying and roasting to obtain secondary carrier powder, wherein the roasting temperature is 500-800 ℃;
s4, mixing and pulping the secondary carrier powder and a salt solution of La, Ce, Nd or Sm, then precipitating the La, Ce, Nd or Sm by using a precipitator, and filtering, washing, drying and calcining to obtain high-temperature-resistant catalyst carrier powder;
s5, dissolving the solid powder obtained in the step S1 to prepare a solution, adding the high-temperature-resistant catalyst carrier powder prepared in the step S4 to dissolve and mix, and drying and roasting to prepare the ultra-high temperature denitration catalyst.
Example two
The ultrahigh-temperature denitration catalyst comprises the following raw materials in parts by weight: 85 parts of titanium dioxide, 10 parts of tungsten trioxide, 2.5 parts of vanadium pentoxide, 4.5 parts of aramid fiber, 5 parts of pulp cotton, 3.5 parts of stearic acid, 5.5 parts of aluminum oxide, 5 parts of zirconium dioxide, 7.5 parts of titanium dioxide, 9 parts of magnesium oxide and 6 parts of rare earth compound; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps:
s1, carrying out hydrothermal reaction on titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, paper pulp cotton and stearic acid, drying, and roasting at 300-600 ℃ to obtain solid powder;
s2, selecting and using 5-10 parts of titanium dioxide, 5-10 parts of aluminum oxide, zirconium dioxide and 6-12 parts of magnesium oxide to be modified by rare earth compounds, uniformly mixing, drying and roasting to obtain first-stage carrier powder, wherein the roasting temperature is 300-;
s3, mixing and pulping the primary carrier powder and a salt solution corresponding to the primary carrier powder, then precipitating the salt solution by using a precipitator, filtering, washing, drying and roasting to obtain secondary carrier powder, wherein the roasting temperature is 500-800 ℃;
s4, mixing and pulping the secondary carrier powder and a salt solution of La, Ce, Nd or Sm, then precipitating the La, Ce, Nd or Sm by using a precipitator, and filtering, washing, drying and calcining to obtain high-temperature-resistant catalyst carrier powder;
s5, dissolving the solid powder obtained in the step S1 to prepare a solution, adding the high-temperature-resistant catalyst carrier powder prepared in the step S4 to dissolve and mix, and drying and roasting to prepare the ultra-high temperature denitration catalyst.
EXAMPLE III
The ultrahigh-temperature denitration catalyst comprises the following raw materials in parts by weight: 100 parts of titanium dioxide, 15 parts of tungsten trioxide, 3 parts of vanadium pentoxide, 6 parts of aramid fiber, 6 parts of pulp cotton, 5 parts of stearic acid, 7 parts of aluminum oxide, 8 parts of zirconium dioxide, 10 parts of titanium dioxide, 12 parts of magnesium oxide and 8 parts of rare earth compound; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps:
s1, carrying out hydrothermal reaction on titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, paper pulp cotton and stearic acid, drying, and roasting at 300-600 ℃ to obtain solid powder;
s2, selecting and using 5-10 parts of titanium dioxide, 5-10 parts of aluminum oxide, zirconium dioxide and 6-12 parts of magnesium oxide to be modified by rare earth compounds, uniformly mixing, drying and roasting to obtain first-stage carrier powder, wherein the roasting temperature is 300-;
s3, mixing and pulping the primary carrier powder and a salt solution corresponding to the primary carrier powder, then precipitating the salt solution by using a precipitator, filtering, washing, drying and roasting to obtain secondary carrier powder, wherein the roasting temperature is 500-800 ℃;
s4, mixing and pulping the secondary carrier powder and a salt solution of La, Ce, Nd or Sm, then precipitating the La, Ce, Nd or Sm by using a precipitator, and filtering, washing, drying and calcining to obtain high-temperature-resistant catalyst carrier powder;
s5, dissolving the solid powder obtained in the step S1 to prepare a solution, adding the high-temperature-resistant catalyst carrier powder prepared in the step S4 to dissolve and mix, and drying and roasting to prepare the ultra-high temperature denitration catalyst.
The ultrahigh-temperature catalyst and the common catalyst are put at different temperatures for catalytic reaction, and the catalytic efficiency is detected to obtain the following table:
| sample (I) | Reaction efficiency at 100 DEG C | Reaction efficiency at 500 DEG C |
| Example one | 80％ | 79％ |
| Example two | 85％ | 85％ |
| EXAMPLE III | 83％ | 84％ |
| Ordinary catalyst | 77％ | 20％ |
According to the table, the catalytic efficiency of the ultra-high temperature denitration catalyst prepared by the method is basically unchanged in a high temperature environment, the catalyst has good high temperature resistance, and the service life is long.
The catalyst is prepared by mixing the high-temperature-resistant catalyst carrier and the catalyst, so that the catalyst can exert high-efficiency catalytic efficiency in a high-temperature environment, the catalyst is prevented from losing effectiveness, and the service life of the catalyst is prolonged. The aramid fiber is added into the denitration catalyst, so that the strength and pressure resistance of the catalyst are improved, and the service life of the catalyst is prolonged; the porosity of the catalyst is increased by adding the pulp cotton. Thereby improving the catalytic efficiency of the catalyst.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. The ultrahigh-temperature denitration catalyst is characterized by comprising the following raw materials in parts by weight: 75-100 parts of titanium dioxide, 9-15 parts of tungsten trioxide, 1.5-3 parts of vanadium pentoxide, 3-6 parts of aramid fiber, 4-6 parts of pulp cotton, 2-5 parts of stearic acid, 4-7 parts of aluminum oxide, 3-8 parts of zirconium dioxide, 5-10 parts of titanium dioxide, 6-12 parts of magnesium oxide and 4-8 parts of rare earth compound; the specific preparation method of the ultra-high temperature denitration catalyst comprises the following steps:
s1, carrying out hydrothermal reaction on titanium dioxide, tungsten trioxide, vanadium pentoxide, aramid fiber, paper pulp cotton and stearic acid, drying, and roasting at 300-600 ℃ to obtain solid powder;
s2, selecting and using 5-10 parts of titanium dioxide, 5-10 parts of aluminum oxide, zirconium dioxide and 6-12 parts of magnesium oxide to be modified by rare earth compounds, uniformly mixing, drying and roasting to obtain primary carrier powder, wherein the roasting temperature is 300 ℃ and 500 ℃;
s3, mixing and pulping the primary carrier powder and a salt solution corresponding to the primary carrier powder, then precipitating the salt solution by using a precipitator, filtering, washing, drying and roasting to obtain secondary carrier powder, wherein the roasting temperature is 500-800 ℃;
s4, mixing and pulping the secondary carrier powder and a salt solution of La, Ce, Nd or Sm, then precipitating the La, Ce, Nd or Sm by using a precipitator, and filtering, washing, drying and calcining to obtain high-temperature-resistant catalyst carrier powder;
s5, dissolving the solid powder obtained in the step S1 to prepare a solution, adding the high-temperature-resistant catalyst carrier powder prepared in the step S4 to dissolve and mix, and drying and roasting to prepare the ultra-high temperature denitration catalyst.
2. The ultra-high temperature denitration catalyst of claim 1, which is characterized by comprising the following raw materials in parts by weight: 80-100 parts of titanium dioxide, 12-15 parts of tungsten trioxide, 2-3 parts of vanadium pentoxide, 4-6 parts of aramid fiber, 4.5-6 parts of pulp cotton, 3-5 parts of stearic acid, 5-7 parts of aluminum oxide, 4-8 parts of zirconium dioxide, 6-10 parts of titanium dioxide, 7-12 parts of magnesium oxide and 5-8 parts of rare earth compound.
3. The ultra-high temperature denitration catalyst of claim 1, which is characterized by comprising the following raw materials in parts by weight: 75-90 parts of titanium dioxide, 9-12 parts of tungsten trioxide, 1.5-2.5 parts of vanadium pentoxide, 3-5 parts of aramid fiber, 4-5 parts of paper pulp cotton, 2-4 parts of stearic acid, 4-6 parts of aluminum oxide, 3-7 parts of zirconium dioxide, 5-9 parts of titanium dioxide, 6-10 parts of magnesium oxide and 4-7 parts of rare earth compound.
4. The ultra-high temperature denitration catalyst of claim 1, which is characterized by comprising the following raw materials in parts by weight: 85 parts of titanium dioxide, 10 parts of tungsten trioxide, 2.5 parts of vanadium pentoxide, 4.5 parts of aramid fiber, 5 parts of pulp cotton, 3.5 parts of stearic acid, 5.5 parts of aluminum oxide, 5 parts of zirconium dioxide, 7.5 parts of titanium dioxide, 9 parts of magnesium oxide and 6 parts of rare earth compound.
5. The ultra-high temperature denitration catalyst according to claim 1, wherein in S1, the pH of the hydrothermal reaction mixture is 10-12.
6. The ultra-high temperature denitration catalyst according to claim 1, wherein in S5, the drying temperature is 80-120 ℃, the drying time is 2.3-3h, and the roasting temperature is 200-300 ℃.
7. The ultra-high temperature denitration catalyst as claimed in claim 1, wherein in S6, the high temperature resistant catalyst carrier is obtained by molding as required, and inert gas N2 or He is introduced during calcination, wherein the calcination temperature is 900-1200 ℃.
8. The ultra-high temperature denitration catalyst according to claim 1, wherein in S4, the catalyst is prepared by modifying with a rare earth compound, and the modifier rare earth element is rare earth oxide such as La, Ce, Nd, Sm and the like.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114471599A (en) * | 2022-03-01 | 2022-05-13 | 江苏鲲鹏环保工程技术有限公司 | Denitration catalyst for deep denitration treatment and preparation method thereof |
| CN116351436A (en) * | 2022-12-30 | 2023-06-30 | 江西新科环保股份有限公司 | Intelligent control method for catalyst regeneration and wastewater treatment 5G network |
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| CN116351436B (en) * | 2022-12-30 | 2024-05-31 | 江西新科环保股份有限公司 | Intelligent control method for catalyst regeneration and wastewater treatment 5G network |
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