CN113117667B - Preparation method of integral honeycomb denitration catalyst - Google Patents
Preparation method of integral honeycomb denitration catalyst Download PDFInfo
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- CN113117667B CN113117667B CN202110385861.6A CN202110385861A CN113117667B CN 113117667 B CN113117667 B CN 113117667B CN 202110385861 A CN202110385861 A CN 202110385861A CN 113117667 B CN113117667 B CN 113117667B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 18
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910003447 praseodymium oxide Inorganic materials 0.000 claims abstract description 9
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 55
- 238000001035 drying Methods 0.000 claims description 45
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 31
- 239000002243 precursor Substances 0.000 claims description 30
- 230000032683 aging Effects 0.000 claims description 28
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 28
- 229910003437 indium oxide Inorganic materials 0.000 claims description 23
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 23
- 229910001868 water Inorganic materials 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 229910021389 graphene Inorganic materials 0.000 claims description 22
- 229920002472 Starch Polymers 0.000 claims description 21
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 21
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 21
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 21
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 21
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 21
- 239000008107 starch Substances 0.000 claims description 21
- 235000019698 starch Nutrition 0.000 claims description 21
- 235000021355 Stearic acid Nutrition 0.000 claims description 20
- 239000003365 glass fiber Substances 0.000 claims description 20
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 20
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 20
- 239000008117 stearic acid Substances 0.000 claims description 20
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical group [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- BVTBRVFYZUCAKH-UHFFFAOYSA-L disodium selenite Chemical group [Na+].[Na+].[O-][Se]([O-])=O BVTBRVFYZUCAKH-UHFFFAOYSA-L 0.000 claims description 16
- YWECOPREQNXXBZ-UHFFFAOYSA-N praseodymium(3+);trinitrate Chemical group [Pr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YWECOPREQNXXBZ-UHFFFAOYSA-N 0.000 claims description 16
- 229960001471 sodium selenite Drugs 0.000 claims description 16
- 235000015921 sodium selenite Nutrition 0.000 claims description 16
- 239000011781 sodium selenite Substances 0.000 claims description 16
- XURCIPRUUASYLR-UHFFFAOYSA-N Omeprazole sulfide Chemical group N=1C2=CC(OC)=CC=C2NC=1SCC1=NC=C(C)C(OC)=C1C XURCIPRUUASYLR-UHFFFAOYSA-N 0.000 claims description 14
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000007580 dry-mixing Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003546 flue gas Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052815 sulfur oxide Inorganic materials 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 18
- 239000007789 gas Substances 0.000 description 16
- 230000003197 catalytic effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 229910052738 indium Inorganic materials 0.000 description 9
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 9
- 229910052716 thallium Inorganic materials 0.000 description 9
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 239000004408 titanium dioxide Substances 0.000 description 7
- 229910005965 SO 2 Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 208000005374 Poisoning Diseases 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000572 poisoning Toxicity 0.000 description 4
- 230000000607 poisoning effect Effects 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000012495 reaction gas Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 229940091258 selenium supplement Drugs 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000026015 thallium poisoning Diseases 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 206010057190 Respiratory tract infections Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 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
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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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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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
A preparation method of an integral honeycomb denitration catalyst is characterized in that the catalyst mainly comprises manganese oxide, selenium oxide and praseodymium oxide as active components and TiO 2 The catalyst is composed of a catalyst carrier, the surface of the integral honeycomb denitration catalyst is adsorbed with an anti-sulfur active component, the specific surface area of the honeycomb denitration catalyst is more than 200m < 2 >/g, mesopores are intensively distributed between 3 nm and 5nm, the axial strength of the catalyst is 2.27 Mpa to 2.34Mpa, the radial strength is 0.62 Mpa to 0.71Mpa, and the conversion rate of NOx is maintained at 80% to 85% under the condition of flue gas containing sulfur oxides.
Description
Technical Field
The invention belongs to the technical field of denitration catalysts, and relates to a preparation method of a sulfur poisoning resistant honeycomb catalyst for flue gas denitration.
Background
Nitrogen oxides, one of the major atmospheric pollutants, have adverse effects on both the environment and human health: the soil and river may be polluted by acid rain, and the growth of crops is damaged; can cause human respiratory tract infection, aggravate the illness state of patients, cause various uncomfortable feeling and the like. The source of nitrogen oxides is wide, and the nitrogen oxides are mainly from tail gas of industrial boilers/kilns of thermal power plants, steel plants, garbage incineration plants, cement plants and the like. GB13223-2011 'emission Standard of atmospheric pollutants for thermal Power plants' prescribes that the emission concentration of nitrogen oxides in the tail gas of a newly built coal-fired boiler is not more than 100mg/Nm3, and the emission concentration of nitrogen oxides in the tail gas of a gas turbine unit is not more than 50mg/Nm3.GB 13271-2014 'emission Standard of atmospheric pollutants for boilers' prescribes that the emission concentration of nitrogen oxides in the tail gas of newly built coal-fired boiler is not more than 300mg/Nm 3 The emission concentration of nitrogen oxides in the tail gas of the newly built gas boiler is not more than 200mg/Nm 3 . According to the actual conditions, the emission standard of local atmospheric pollutants established under the condition of meeting national standard of nitrogen oxide emission is aimed at all places, and the emission concentration of nitrogen oxide in tail gas of coal-fired/gas-fired boiler is required to be not more than 50mg/Nm in certain areas 3 。
At present, the SCR denitration technology is used as the most widely applied and mature effective flue gas denitration technologyA kind of electronic device is disclosed. The SCR denitration device of the coal-fired power plant is mainly arranged between an economizer and an air preheater and contains a large amount of fly ash and high-concentration SO 2 After 24000 hours of operation, the SCR catalyst is deactivated and replaced to be abandoned due to the problems of poisoning, ash blockage, abrasion and the like. Among them, the problem of catalyst poisoning is common, and the main substances causing poisoning are as follows: alkali metals, heavy metals, H2O and SO 2 Etc.
In order to control the emission concentration of nitrogen oxides to be kept below the relevant national standard and local standard, the tail gas denitration generally adopts SNCR or SCR or SNCR and SCR combined denitration. Wherein SCR denitration is NO in flue gas X And NH 3 In the process of converting into water and N2 under the catalysis of the denitration catalyst, the denitration activity is high, the chemical life is long, the ammonia escape rate is low, and SO is low 2 Low oxidation rate and the like, and is widely applied to denitration of tail gas of industrial kilns/boilers. The conventional SCR denitration catalyst has higher denitration activity at medium temperature (280-420 ℃), but has lower denitration activity at low temperature (160-280 ℃), the denitration rate at low temperature 160 ℃ is about 79%, the denitration efficiency at 200 ℃ is about 84%, and the denitration efficiency is not ideal.
In addition, when water and SO are added to the feed gas 2 When the catalytic activity of the catalyst is obviously reduced, the conversion rate is rapidly reduced, and as disclosed in CN202010755439, the catalyst is used for denitration of cement kiln flue gas and thallium poisoning resistance of core-shell honeycomb and a preparation method thereof. The catalyst is a core-shell catalyst, and V-W/TiO with thallium-resistant auxiliary agent added 2 The metal oxide film is used as a shell structure; the thallium resistant aid includes elemental gallium and/or elemental indium. The thallium poisoning resistance of the denitration catalyst prepared by the invention is 2-3 times higher than that of the existing catalyst, the denitration efficiency is stably maintained above 90%, and the breakthrough of the denitration catalyst technology under the condition of thallium-containing flue gas of a cement kiln is realized. The catalyst of the invention can prolong the service life of the SCR denitration catalyst, reduce the use cost of a denitration system, improve the adaptability of the SCR denitration catalyst under the condition of thallium-containing flue gas, reduce the production cost of denitration operation management, and have great economic value. The catalyst has the following problems that the preparation method of the catalyst comprises the following steps: ammonium metavanadate and metavanadateMixing ammonium tungstate, thallium-resistant auxiliary agent (indium nitrate) and water, stirring, heating for dissolution, mixing with titanium dioxide powder to obtain slurry, and drying to obtain V-W/TiO of the thallium-resistant auxiliary agent 2 The powder, i.e. simple mixing, because of the confinement of the preparation process, the indium nitrate active component therein is obviously protected from the inside of the catalyst and practically cannot be contacted with the reaction gas, especially when the surface area of the catalyst is first, the channels are not rich, the indium active component is more difficult to exert its thallium resistance, and furthermore, the indium active component in said patent is mainly used for thallium resistance, but in practice thallium is not necessarily present in the flue gas, if at all, its content is very small.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of an integral honeycomb denitration catalyst, which can obtain a catalyst with high specific surface area, active sulfur-resistant components are dispersed on the surface of the catalyst, and the indium active components are found to have extremely high sulfur-resistant activity, so that the industrial problems of poor sulfur-resistant activity, rapid denitration efficiency reduction, low strength, short service life and the like of the denitration catalyst in the prior art are overcome, and the integral honeycomb denitration catalyst can realize industrial application.
A preparation method of a honeycomb denitration catalyst comprises the following steps:
(1) Uniformly mixing precursors of manganese oxide, selenium oxide and praseodymium oxide with deionized water, and adding TiO 2 Mixing the obtained mixture A;
(2) Carrying out dry mixing on stearic acid, glass fiber and graphene oxide to obtain a mixed material B;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing; then adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste;
(4) Aging and forming;
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying;
(8) Impregnating an indium oxide precursor;
(9) Secondary drying;
(10) And (5) roasting.
In some embodiments of the invention, the manganese oxide precursor is manganese nitrate, the selenium oxide precursor is sodium selenite, and the praseodymium oxide precursor is praseodymium nitrate.
In some embodiments of the invention, the mass ratio of the manganese oxide, the selenium oxide and the praseodymium oxide is 7:1-3:1-2, and the total mass usage of the manganese oxide, the selenium oxide and the praseodymium oxide is equal to that of TiO 2 The mass and consumption ratio of (2) is 1: (5-6).
In some embodiments of the invention, the mass ratio of stearic acid, glass fibers, graphene oxide to titanium oxide is (0.03-0.05): (0.05-0.07): (0.02-0.04): 1.
In some embodiments of the invention, the mass ratio of hydroxypropyl methylcellulose, silica sol, starch to titanium oxide is (0.03-0.05): 0.04-0.5): 0.03-0.05): 1.
In some embodiments of the invention, the amount of water used in step (1) and step (3) is adjusted; the aging time and the aging temperature of the step (4) are such that the molding of the mixed material obtained by the aging molding is 9-11, the water content is 20-30%, the aging molding treatment temperature is 30+/-2 ℃ and the aging molding treatment time is 20-25h.
In some embodiments of the invention, the primary mixing time is 10-15min, the secondary mixing time is 30-40min,
in some embodiments of the invention, the primary drying is performed at a temperature of 60-70 ℃ for 24-48 hours, the secondary drying is performed at a temperature of 1-2 ℃/min up to 50-60 ℃ for 3-4 hours, then 1-2 ℃/min up to 90-100 ℃ for 10-12 hours, then 1-2 ℃/min up to 200-220 ℃ for 24-48 hours.
In some embodiments of the invention, the indium oxide precursor is 3-5wt.% indium nitrate, and the time for the auxiliary vacuum pump to suck during the soaking process is until no obvious bubbles overflow, and the temperature is normal temperature.
In some embodiments of the invention, the firing is followed by a secondary drying step at 15-6deg.C/min up to 500-600deg.C for 3-4 hours.
Wherein Mn is a main active component for providing an active site for catalytic reaction, selenium and praseodymium are main promoter components for improving the SCR reaction activity, and graphene is used for improving the specific surface area of the honeycomb catalyst; after primary drying and forming, the indium active component is immersed before secondary drying, so that the problem that the indium active component is buried and cannot be contacted with the raw material gas due to direct mixing is avoided.
By optimizing the preparation process and adjusting process parameters such as temperature programming parameters, the mechanical strength of the catalyst is effectively improved, and the industrial requirement is met as shown in figure 1.
The number of pores for preparing the catalyst is (16-20) ×16-20, and the specific surface area is greater than 200g/cm 2 。
Beneficial technical effects
(1) By increasing the graphene material, the specific surface area of the catalyst is effectively increased, the contact of the reaction raw material gas and the active components is facilitated, particularly the contact of the active components in the whole catalyst is facilitated, the catalytic activity of the catalyst is improved, and the active sites are increased.
(2) By introducing selenium and praseodymium promoters, the catalytic activity is significantly improved.
(3) The bulk catalyst of the honeycomb denitration catalyst has higher mechanical strength and meets the industrial requirement.
(4) The sulfur-resistant activity of the catalyst is effectively ensured by controlling the loading position of the indium on the catalyst, and the sulfur-resistant activity of the catalyst is increased while the use amount of the indium is obviously reduced.
Drawings
FIG. 1 is a pictorial view of a honeycomb catalyst of the present invention.
FIG. 2 is a chart of BET-BJH for gas adsorption and desorption in comparative examples 1-3, according to example 1 of the present invention.
FIG. 3 is a graph showing the water and sulfur resistance test at 175℃for the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Example 1
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:1:1, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is 0.03:0.05:0.02:1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 10min; adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is 0.03:0.04:0.03:1, and the secondary mixing time is 30min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 20 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the primary drying temperature is 60 ℃ and the time is 24 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 3 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is that the temperature is 1 ℃/min to 50 ℃ at normal temperature, the temperature is kept for 3 hours, then 1 ℃/min to 90 ℃, the temperature is kept for 10 hours, then 1 ℃/min to 200 ℃, and the temperature is kept for 24 hours.
(10) Roasting, namely raising the temperature to 500 ℃ at 5 ℃/min, maintaining for 3 hours, and naturally cooling.
Example 2
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:1.5:1.5, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.04): 0.06): 0.03): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 65 ℃ and the time is 36 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 4 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is carried out at the normal temperature of 1.5 ℃/min to 55 ℃, the temperature is kept for 3.5 hours, then 1.5 ℃/min to 95 ℃, the temperature is kept for 11 hours, and then 1.5 ℃/min to 210 ℃ and the temperature is kept for 36 hours.
(10) Roasting, namely raising the temperature to 550 ℃ at 5.5 ℃/min, maintaining for 3.5 hours, and naturally cooling.
Example 3
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:3:2, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is (6) times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.05): 0.07): 0.04): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 15min; then adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.05) to 1, and the secondary mixing time is 40min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 25 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 70 ℃ and the time is 48 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 5 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is that the temperature is increased to 60 ℃ at the normal temperature of 2 ℃/min, the temperature is kept for 4 hours, then the temperature is increased to 100 ℃ at the speed of 2 ℃/min, the temperature is kept for 12 hours, then the temperature is increased to 220 ℃ at the speed of 2 ℃/min, and the temperature is kept for 48 hours.
(10) Roasting, namely raising the temperature to 600 ℃ at the speed of 6 ℃/min, keeping for 4 hours, and naturally cooling.
Comparative example 1.
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:1.5:1.5, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid and glass fiber to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the titanium oxide is (0.04): (0.06): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 65 ℃ and the time is 36 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 4 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is carried out at the normal temperature of 1.5 ℃/min to 55 ℃, the temperature is kept for 3.5 hours, then 1.5 ℃/min to 95 ℃, the temperature is kept for 11 hours, and then 1.5 ℃/min to 210 ℃ and the temperature is kept for 36 hours.
(10) Roasting, namely raising the temperature to 550 ℃ at 5.5 ℃/min, maintaining for 3.5 hours, and naturally cooling.
Comparative example 2.
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) After evenly mixing manganese nitrate with deionized water, adding TiO 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of that of manganese nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.04): 0.06): 0.03): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 65 ℃ and the time is 36 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 4 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is carried out at the normal temperature of 1.5 ℃/min to 55 ℃, the temperature is kept for 3.5 hours, then 1.5 ℃/min to 95 ℃, the temperature is kept for 11 hours, and then 1.5 ℃/min to 210 ℃ and the temperature is kept for 36 hours.
(10) Roasting, namely raising the temperature to 550 ℃ at 5.5 ℃/min, maintaining for 3.5 hours, and naturally cooling.
Comparative example 3.
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:1.5:1.5, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.04): 0.06): 0.03): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 65 ℃ and the time is 36 hours,
(8) Impregnating an indium oxide precursor; the indium oxide precursor is indium nitrate of 4 wt%, and the vacuum pump is assisted to suck the indium oxide precursor in the soaking process until no obvious bubbles overflow, and the temperature is normal temperature.
(9) Secondary drying; the secondary drying is carried out at the normal temperature of 5 ℃/min to 210 ℃ and is kept for 36 hours.
(10) Roasting, namely raising the temperature to 550 ℃ at 10 ℃/min, maintaining for 3.5h, and naturally cooling.
TABLE 1
As shown in Table 1 above, by carrying out the specific surface area test of the above-mentioned example 2 and comparative examples 1,2,3, as shown in FIG. 2, a honeycomb catalyst having a specific surface area significantly greater than 200 g/m was obtained by the production method of the present invention 2 The major contribution to specific surface area is in the doped graphene component, which is burned off during calcination leaving mesoporous channels with a most probable pore diameter of 3.27nm, which is not significantly changed to 3.61nm compared to comparative example 2, but has a smaller specific surface area than example 2, mainly because the reduction of the auxiliaries reduces the interfacial adjacent channels between different oxides, resulting in a reduction of the specific surface area of comparative example 2 by 161g/m 2 As the graphene oxide is not contained in the comparative document 1, the specific surface area is obviously reduced to 71g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Comparative example 3 mainly examined the contribution of the firing temperature to the mechanical strength, and the firing temperature of comparative document 3 was not properly controlled, so that the mechanical strength was extremely lowered, far less than the mechanical strength of the catalyst of the embodiment of the present invention, in which the axial strength was 2.27 to 2.34Mpa and the radial strength was 0.62 to 0.71Mpa, and in addition, if the hydroxypropyl methylcellulose, silica sol, starch binder of the embodiment 2 was eliminated, the honeycomb catalyst could not be molded and was easily crushed.
Comparative example 4.
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) After evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and 4wt.% indium nitrate deionized water with the mass ratio of 7:1.5:1.5, adding TiO 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.04): 0.06): 0.03): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of primary drying is 65 ℃, the time is 36h, and the temperature is reduced;
(8) Secondary drying; the secondary drying is carried out at the normal temperature of 1.5 ℃/min to 55 ℃, the temperature is kept for 3.5 hours, then 1.5 ℃/min to 95 ℃, the temperature is kept for 11 hours, and then 1.5 ℃/min to 210 ℃ and the temperature is kept for 36 hours.
(9) Roasting, namely raising the temperature to 550 ℃ at 5.5 ℃/min, maintaining for 3.5 hours, and naturally cooling.
Comparative example 5.
The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Evenly mixing manganese nitrate, sodium selenite, praseodymium nitrate and deionized water in a mass ratio of 7:1.5:1.5, and then adding TiO (titanium dioxide) 2 Mixing the obtained mixture A and the TiO 2 The mass dosage of the catalyst is 5.5 times of the total dosage of manganese nitrate, sodium selenite and praseodymium nitrate;
(2) Dry-mixing stearic acid, glass fiber and graphene oxide to obtain a mixed material B, wherein the mass ratio of the stearic acid to the glass fiber to the graphene oxide to the titanium oxide is (0.04): 0.06): 0.03): 1;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing for 12.5min;
adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste, wherein the mass ratio of the hydroxypropyl methylcellulose to the silica sol to the starch to the titanium oxide is (0.04): (0.045): (0.04): 1, and the secondary mixing time is 35min;
(4) Aging and forming; the temperature of the aging forming treatment is 30+/-2 ℃ and the time is 22.5 hours.
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying; the temperature of the primary drying is 65 ℃ and the time is 36 hours,
(8) Secondary drying; the secondary drying is carried out at the normal temperature of 1.5 ℃/min to 55 ℃, the temperature is kept for 3.5 hours, then 1.5 ℃/min to 95 ℃, the temperature is kept for 11 hours, and then 1.5 ℃/min to 210 ℃ and the temperature is kept for 36 hours.
(9) Roasting, namely raising the temperature to 550 ℃ at 5.5 ℃/min, maintaining for 3.5 hours, and naturally cooling.
Catalytic activity testing was performed on example 2, comparative example 4, comparative example 5: the test temperature range was 175 ℃. The reaction gas contains 500 ppm NO, 500 ppm NH 3 、5 vol. % O 2 、5 vol. % H 2 O (on demand), 200 ppm SO 2 (on demand) and N 2 As a balance gas. NH (NH) 3 The SCR test has a total flow rate of 100 ml/min and a space velocity (GHSV) of 30000 h -1 。
As shown in figure 3, the denitration catalyst obtained by the subsequent indium oxide loading has higher denitration catalytic activity, and SO is not introduced into boiled water 2 Full conversion example 2 can fully convert NO X The catalyst of comparative example 4 was a mixture of indium nitrate with a major co-active component, which was almost completely purified of NO at 175℃ X The catalyst in comparative example 5 was free of indium nitrate, and at 175 ℃ the conversion was 93.8%, which demonstrates that indium nitrate also works as an auxiliary agent to synergistically raise anhydrous SO-free 2 Catalytic activity under conditions, but this is not the focus of the study of the present invention.
Introducing steam into the raw material gas, H 2 O and NH in the reaction gas 3 Competitive adsorption of/NO on the active site of the catalyst surface resulted in a decrease in catalytic activity of example 2 and comparative examples 4-5, further incorporation of SO 2 After that, the catalytic activity is extremely obviously reducedFor comparative example 4, the sulfur and water resistance properties of the catalytically active component, especially indium, are significantly consistent as the cerium nitrate is mixed with the primary co-active component, when water and SO are withdrawn 2 And then, the denitration catalytic activity is improved to a certain extent. As can be seen from FIG. 3, in the presence of both water and SO 2 After that, the catalyst prepared by the invention has extremely high catalytic activity, and the catalytic conversion rate of NOx is more than 80 percent and less than 85 percent.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (9)
1. The preparation method of the honeycomb denitration catalyst is characterized by comprising the following steps of:
(1) Uniformly mixing precursors of manganese oxide, selenium oxide and praseodymium oxide with deionized water, and adding TiO 2 Mixing the obtained mixture A; the mass ratio of the manganese oxide, the selenium oxide and the praseodymium oxide is 7:1-3:1-2, and the total mass dosage of the manganese oxide, the selenium oxide and the praseodymium oxide and the TiO 2 The mass and consumption ratio of (2) is 1: (5-6);
(2) Carrying out dry mixing on stearic acid, glass fiber and graphene oxide to obtain a mixed material B;
(3) Adding the mixture B into a mixer containing the mixture A, and performing primary mixing; then adding a mixed binder consisting of hydroxypropyl methylcellulose, silica sol, starch and water into a mixer, and performing secondary mixing to obtain paste;
(4) Aging and forming;
(5) Pugging;
(6) Extrusion molding;
(7) Primary drying;
(8) Impregnating an indium oxide precursor;
(9) Secondary drying;
(10) And (5) roasting.
2. The method for preparing a honeycomb denitration catalyst as claimed in claim 1, wherein the manganese oxide precursor is manganese nitrate, the selenium oxide precursor is sodium selenite, and the praseodymium oxide precursor is praseodymium nitrate.
3. The preparation method of the honeycomb denitration catalyst as claimed in claim 1, wherein the mass ratio of stearic acid, glass fiber, graphene oxide and titanium oxide is (0.03-0.05): (0.05-0.07): (0.02-0.04):1.
4. The method for preparing a honeycomb denitration catalyst as claimed in claim 1, wherein the mass ratio of the hydroxypropyl methylcellulose, the silica sol, the starch and the titanium oxide is (0.03-0.05): (0.04-0.5): (0.03-0.05):1.
5. The method for preparing a honeycomb denitration catalyst as claimed in claim 1, wherein the amount of water used in the step (1) and the step (3) is adjusted; the aging time and the aging temperature of the step (4) are such that the molding of the mixed material obtained by the aging molding is 9-11, the water content is 20-30%, the aging molding treatment temperature is 30+/-2 ℃ and the aging molding treatment time is 20-25h.
6. The method for preparing a honeycomb denitration catalyst according to claim 1, wherein the primary mixing time is 10-15min, and the secondary mixing time is 30-40min.
7. The method for preparing a honeycomb denitration catalyst as claimed in claim 1, wherein the primary drying is carried out at a temperature of 60-70 ℃ for 24-48 hours, the secondary drying is carried out at a temperature of 1-2 ℃/min up to 50-60 ℃ for 3-4 hours, then 1-2 ℃/min up to 90-100 ℃ for 10-12 hours, then 1-2 ℃/min up to 200-220 ℃ for 24-48 hours.
8. The method for preparing a honeycomb denitration catalyst according to claim 1, wherein the indium oxide precursor is indium nitrate in an amount of 3-5 wt%, and the time for the auxiliary vacuum pump suction treatment in the soaking process is up to no obvious bubble overflow, and the temperature is normal temperature.
9. The method for preparing a honeycomb denitration catalyst as claimed in claim 1, wherein the calcination is carried out by a secondary drying step, heating to 500-600 ℃ at 5-6 ℃/min, maintaining for 3-4h, and naturally cooling.
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