CN115400760A - Honeycomb type SCR denitration catalyst and preparation method thereof - Google Patents
Honeycomb type SCR denitration catalyst and preparation method thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 152
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 38
- 239000002105 nanoparticle Substances 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 26
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 24
- FWPIDFUJEMBDLS-UHFFFAOYSA-L tin(II) chloride dihydrate Chemical compound O.O.Cl[Sn]Cl FWPIDFUJEMBDLS-UHFFFAOYSA-L 0.000 claims description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 17
- 210000001161 mammalian embryo Anatomy 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 14
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 12
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 12
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 12
- 229960001484 edetic acid Drugs 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- GJKFIJKSBFYMQK-UHFFFAOYSA-N lanthanum(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GJKFIJKSBFYMQK-UHFFFAOYSA-N 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 11
- QGAVSDVURUSLQK-UHFFFAOYSA-N ammonium heptamolybdate Chemical compound N.N.N.N.N.N.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Mo].[Mo].[Mo].[Mo].[Mo].[Mo].[Mo] QGAVSDVURUSLQK-UHFFFAOYSA-N 0.000 claims description 11
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims description 10
- 239000004408 titanium dioxide Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- 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 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 239000004480 active ingredient Substances 0.000 claims description 5
- 230000002431 foraging effect Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims 2
- 229910021641 deionized water Inorganic materials 0.000 claims 2
- 239000004615 ingredient Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 238000001914 filtration Methods 0.000 abstract description 7
- 230000032683 aging Effects 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 description 29
- 230000000694 effects Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 239000010425 asbestos Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052895 riebeckite Inorganic materials 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- QZRHHEURPZONJU-UHFFFAOYSA-N iron(2+) dinitrate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QZRHHEURPZONJU-UHFFFAOYSA-N 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229920000834 poly(ferrocenylene) polymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
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- 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
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- 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
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/85—Chromium, molybdenum or tungsten
- B01J23/88—Molybdenum
- B01J23/887—Molybdenum containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/8877—Vanadium, tantalum, niobium or polonium
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- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B01J23/888—Tungsten
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Abstract
The invention relates to a honeycomb type SCR denitration catalyst and a preparation method thereof, belonging to the technical field of catalyst preparation. The production process comprises the steps of catalyst slurry preparation, aging, filtration, extrusion molding, drying and roasting. The catalyst slurry additive Sn-La-Fe-Li-Si quinary composite oxide nanoparticles are added during preparation of the catalyst slurry, so that the drying process can be shortened to 5-6 days, the highest temperature in the roasting process is reduced to 400 ℃, the production period of the honeycomb type denitration catalyst is shortened, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of catalyst preparation, and particularly relates to a honeycomb type SCR denitration catalyst and a preparation method thereof.
Background
In the SCR denitration catalyst used in the field of industrial flue gas denitration at present, the honeycomb catalyst still accounts for the highest proportion in the denitration catalyst market due to the advantages of high denitration activity, small use volume, mature production technology and the like.
In recent years, under the influence of the international market, the prices of various raw materials required for producing the denitration catalyst have been greatly increased, which is undoubtedly a very serious challenge for the manufacturers of the denitration catalyst. Under the intense market competition environment, the production cost and the product quality directly relate to the market competitiveness and the vitality of enterprises, so how to reduce the production cost and improve the product quality is the most important topic faced by all denitration catalyst production enterprises nowadays. The production process of the honeycomb SCR denitration catalyst is similar and different, mainly comprises the procedures of pug preparation, aging, extrusion molding, drying, roasting and the like, and the adopted equipment is basically the same. The raw materials of the carrier, the active ingredient, the active assistant, the forming assistant and the like selected by different manufacturers are basically the same, so that the material cost and the product quality of different manufacturers are not much different. Therefore, reducing the production process consumption will be the key point for cost control of denitration catalysts in the future. For improving the product quality, the mechanical strength of the catalyst is improved by adding special auxiliary agents, which is one of the most common ways at present.
Chinese patent CN201510401510.4 discloses a honeycomb SCR denitration catalyst and a preparation method thereof, and the method uses diatomite and a molecular sieve to replace a large amount of titanium dioxide as a carrier, thereby reducing the production cost of the catalyst. Meanwhile, a polymer reducing agent polyferrocenes is added to improve the denitration activity of the catalyst. Chinese patent CN201810903216.7 discloses a honeycomb type low-temperature denitration catalyst and a preparation process thereof, the process takes a waste SCR catalyst as a raw material, the waste is cleaned and then ground, the obtained powder is taken as a carrier to load active ingredients of cobalt, manganese and cerium, then a forming auxiliary agent and a proper amount of water are added to mix to prepare honeycomb catalyst mud, and then the low-cost honeycomb type SCR denitration catalyst is prepared through the steps of filtering, extrusion forming, drying, roasting and the like. The production process for reducing the cost of the honeycomb catalyst which is proposed at present is mostly waste material doped or low-price carrier used, and although part of the production cost can be reduced, the mechanical strength and denitration activity of the catalyst are sacrificed at the same time, so that the product quality competitiveness is obviously reduced.
Disclosure of Invention
The invention provides a honeycomb type SCR denitration catalyst with shortened production period and reduced energy consumption and a preparation method thereof, aiming at solving the problem that the mechanical strength and denitration activity of the catalyst are reduced by adopting a method of doping waste materials or using a low-price carrier in order to reduce the production cost of the existing honeycomb type SCR catalyst.
The invention adopts the following technical scheme: the honeycomb type SCR denitration catalyst is obtained by extrusion forming, drying and roasting of catalyst slurry, wherein anatase type TiO is adopted in the catalyst slurry 2 As a carrier, sn-La-Fe-Li-Si quinary composite oxide nano particles are used as a catalyst slurry additive, V 2 O 5 As an active ingredient of the catalyst, WO 3 Or MoO 3 As a co-agent 。
Furthermore, each component in the catalyst slurry auxiliary agent Sn-La-Fe-Li-Si quinary composite oxide nano-particles exists in the form of oxide, and the mass percentage of each oxide is as follows: 1.8-3:1-2.5:7-9:0.2-0.5:87.3-87.7.
Furthermore, the catalyst slurry auxiliary agent Sn-La-Fe-Li-Si five-membered composite oxide nano-particles have the particle size range of 3-10 nm and the specific surface area of more than 150 m 2 /g。
Furthermore, the catalyst slurry auxiliary agent Sn-La-Fe-Li-Si five-element composite oxide nano particles occupy TiO carrier 2 6-10% of the mass.
Further, the active ingredient V in the catalyst 2 O 5 Quality of0.8-1.5 percent of the total mass of the catalyst and active auxiliary agent WO 3 Or MoO 3 The mass of the catalyst is 2-4% of the total mass of the catalyst.
Further, the catalyst slurry also comprises a forming assistant with the mass ratio of 3.5-11.5%, wherein the forming assistant comprises the following components in percentage by mass: 40 to 45 percent of kaolin, 30 to 35 percent of 9 mm glass fiber, 2 to 4 percent of paper fiber, 4 to 8 percent of hydroxypropyl methyl cellulose, 4 to 8 percent of polyvinyl alcohol and 4 to 8 percent of stearic acid.
The preparation method of the honeycomb type SCR denitration catalyst comprises the following steps:
(1) Preparation of an auxiliary agent: weighing stannous chloride dihydrate, lanthanum nitrate hexahydrate, ferric nitrate nonahydrate, lithium chloride, tetraethyl silicate and ethylenediamine tetraacetic acid according to a proportion, respectively dissolving the stannous chloride dihydrate with water, and dissolving the lanthanum nitrate hexahydrate, the ferric nitrate nonahydrate and the lithium chloride with water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, continuously stirring, transferring the paste into a roasting vessel when the solution becomes viscous paste, heating to 300 ℃ by using a trolley furnace, preserving heat, and obtaining the Sn-La-Fe-Li-Si five-membered composite oxide nanoparticle auxiliary agent after roasting;
(2) Preparation of catalyst slurry: weighing ammonium metavanadate, ammonium metatungstate or ammonium heptamolybdate according to a proportion, adding the ammonium metavanadate into hot water at the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium metatungstate or ammonium heptamolybdate, and continuously stirring until the ammonium metatungstate or ammonium heptamolybdate is completely dissolved to obtain an active solution; weighing titanium dioxide and the nanoparticle auxiliary agent prepared in the step 1 according to a proportion, adding the titanium dioxide and the nanoparticle auxiliary agent into a mixing roll for premixing, then sequentially adding the prepared active solution, stirring for 1 h, adding the forming auxiliary agent, stirring, and adjusting the pH value of the pug to 8.0-9.0; completing the preparation of the catalyst mud material, collecting and wrapping the mixed mud material, and aging the mud material in a room temperature environment;
(3) Extruding and molding the catalyst: installing a filter screen at the outlet of the extruder, and filtering the aged pug; installing a specific die at the outlet of the extruder, molding by using filtered pug to obtain a honeycomb catalyst wet blank body, and wrapping the honeycomb wet blank body cut to a fixed length by using a thick paper shell;
(4) Drying the catalyst: drying and dewatering the wrapped honeycomb wet embryo body, gradually raising the temperature of a drying room within 25-80 ℃, and finishing drying when the water content of the honeycomb wet embryo body is less than 5%;
(5) Roasting the catalyst: and (3) carrying out sectional roasting in a trolley type resistance furnace, slowly cooling after roasting is finished, wherein the cooling rate is not more than 3 ℃/min, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature is reduced to below 45 ℃.
Further, when the step (5) is carried out by the sectional roasting: the temperature raising program comprises four stages, wherein the first stage is raising the temperature to 100 ℃ within 2 h, keeping the temperature for 2 h, the second stage is raising the temperature from 100 ℃ to 200 ℃ within 3 h, keeping the temperature for 3 h, the third stage is raising the temperature from 200 ℃ to 300 ℃ within 4 h, keeping the temperature for 3 h, and the fourth stage is raising the temperature from 300 ℃ to 400 ℃ within 4 h, and keeping the temperature for 3 h.
The advantages of the invention are as follows:
(1) The production energy consumption is reduced by shortening the drying time: adding Sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent into the catalyst slurry, wherein SiO is 2 The plasticity of the wet honeycomb embryo body can be reduced, the shrinkage and deformation of the wet embryo body in the drying process can be weakened, the volatilization of water can be accelerated, the water content of the wet embryo can be reduced to be below 5% within 5-6 days on the premise that the wet embryo does not crack, the drying time is shortened to be 3-4 days, the energy consumption in the drying process is reduced, and the production cost of an enterprise is reduced;
(2) And (3) reduction of roasting temperature: the method comprises the steps of decomposing components such as ammonium metavanadate, ammonium metatungstate and the like in a common SCR catalyst, wherein the highest temperature in the roasting process of a honeycomb SCR denitration catalyst is usually 550-600 ℃, and after the Sn-La-Fe-Li-Si quinary composite oxide nanoparticle assistant is added, lanthanum oxide can be uniformly coated on the surfaces of titanium dioxide, ammonium metavanadate, ammonium metatungstate and ammonium heptamolybdate powder, so that the bonding effect among powder particles can be enhanced at a high temperature, the ammonium metavanadate can be completely decomposed at the roasting temperature of 400 ℃, and meanwhile, a carrier can obtain better mechanical strength at the roasting temperature. The lower roasting temperature reduces the energy consumption in the process production and the catalysisCracking rate of the agent, improved product qualification rate, and SiO 2 The addition of the (2) can reduce the roasting deformation of the blank, so that the yield of the roasting process reaches more than 97%;
(3) Has stronger mechanical strength: in the invention, sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent is added, wherein Li 2 O can promote the migration rate of powder under the high-temperature condition, and improve the particle fluidity, so that the catalyst has better compactness on the premise of not generating obvious lattice distortion, and further has stronger mechanical strength.
(4) The denitration activity is good: the Sn-La-Fe-Li-Si quinary composite oxide nanoparticle assistant is added, and the specific surface area can reach 150 m 2 The adsorption capacity of the catalyst to reactants can be improved, the activity of the catalyst is enhanced, meanwhile, tin oxide in the auxiliary agent can promote the catalyst to form lattice defects, so that the catalyst has strong oxygen storage and release capacity, the SCR reaction is promoted, iron oxide can prevent the catalyst from being excessively sintered and distorted in crystal form, the size of crystal grains is effectively reduced, the specific surface area of the catalyst is increased, the amount of active oxygen on the surface of the catalyst can be increased, and the denitration activity of the catalyst is further improved.
Drawings
FIG. 1 is a graph showing the results of comparative tests of denitration activities at 250 ℃ in examples 1 to 4 of the present invention and comparative examples 1 to 4.
FIG. 2 is a graph showing the results of comparative tests of denitration activities at 350 ℃ in examples 1 to 4 of the present invention and comparative examples 1 to 4.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be embodied in other specific forms than those described herein, and it will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention.
Example 1: a preparation method of a honeycomb type SCR catalyst comprises the following steps:
(1) Preparing the Sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent: respectively weighing 2.7 kg of stannous chloride dihydrate, 3.99 kg of lanthanum nitrate hexahydrate, 21.21 kg of ferric nitrate nonahydrate, 0.09 kg of lithium chloride, 181.85 kg of tetraethyl silicate and 21 kg of ethylene diamine tetraacetic acid, respectively dissolving the stannous chloride dihydrate with 2.5 kg of water, and dissolving the lanthanum nitrate hexahydrate, the ferric nitrate nonahydrate and the lithium chloride with 60 kg of water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, and continuously stirring until the solution becomes viscous paste; transferring the paste into a roasting vessel, heating to 300 ℃ using a car-bottom oven and holding for 3 h, obtaining 3% Sn-2.5% La-7% Fe-0.2% Li-87.5% Si five-membered composite oxide nanoparticle auxiliary;
(2) Preparing catalyst slurry: adding 600 kg of titanium dioxide and 60 kg of nano-particle auxiliary agent into a mixing roll, and starting the mixing roll to stir uniformly; weighing 7.71 kg of ammonium metavanadate and 36.14 kg of ammonium metatungstate according to the proportion, adding the ammonium metavanadate into hot water with the mass of 300 kg and the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium metatungstate, continuously stirring until the ammonium metavanadate is completely dissolved, adding the prepared solution into the mixed powder, and stirring for 1 hour; then adding 29.5 kg of kaolin, 24.5 kg of glass fiber, 2.1 kg of paper fiber, 4.2 kg of hydroxypropyl methyl cellulose, 4.2 kg of polyvinyl alcohol and 5.6 kg of stearic acid, continuously stirring for 2 hours, and finally adding ammonia water to adjust the pH value of the pug to 8.5; collecting and wrapping the mixed pug, and placing the pug indoors for ageing for 48 hours;
(3) Extruding and molding the catalyst: installing a filter screen at the outlet of the extruder, and filtering the aged pug; installing a 25-hole honeycomb catalyst die at the outlet of the extruder, extruding and molding the filtered mud to obtain a honeycomb catalyst wet blank body, cutting the wet blank body to the length of 1000 mm, and wrapping the wet blank body by using a thick paper shell;
(4) Drying a catalyst wet blank: conveying the wrapped honeycomb wet embryo body into a drying room for drying and dewatering, wherein the temperature in the drying room is sequentially set to be 25 ℃ for heat preservation for 48h, 35 ℃ for heat preservation for 36 h,50 ℃ for heat preservation for 24 h,60 ℃ for heat preservation for 24 h, and 80 ℃ for 12 h, and the water content of the honeycomb embryo body after drying is 3.9% (6 days);
(5) Roasting: uniformly placing the dried honeycomb catalyst blank on a roasting bracket, using asbestos ropes to block the contact part of the bottom of the catalyst and the bracket and the catalyst bodies on the upper layer and the lower layer, and sending the honeycomb catalyst blank into a trolley type resistance furnace for roasting after the placement is finished, wherein the temperature rise procedure is 2 h to 100 ℃, the heat preservation is 2 h,3 h is carried out from 100 ℃ to 200 ℃, the heat preservation is 3 h,4 h is carried out from 200 ℃ to 300 ℃, the heat preservation is 3 h,4 h is carried out from 300 ℃ to 400 ℃, and the heat preservation is 3 h; and (4) slowly cooling after the baking and sintering, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature in the furnace reaches 40 ℃.
Preparation to obtain V 2 O 5 Content of 0.8%, WO 3 The content is 4%, the thickness of the inner wall is 0.9 mm, the thickness of the outer wall is 1.2 mm, and the length is 1000 mm.
Example 2: a preparation method of a honeycomb type SCR catalyst comprises the following steps:
(1) Preparing the Sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent: respectively weighing 0.97 kg of stannous chloride dihydrate, 0.96 kg of lanthanum nitrate hexahydrate, 16.36 kg of iron nitrate nonahydrate, 0.13 kg of lithium chloride, 109.61 kg of tetraethyl silicate and 19.2 kg of ethylenediamine tetraacetic acid, respectively dissolving the stannous chloride dihydrate with 0.9 kg of water, and dissolving the lanthanum nitrate hexahydrate, the iron nitrate nonahydrate and the lithium chloride with 49 kg of water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, and continuously stirring until the solution becomes viscous paste; transferring the paste into a roasting vessel, heating to 300 ℃ using a car-top oven and holding for 3 h, to obtain 1.8% Sn-1% La-9% Fe-0.5% Li-87.7% Si penta-complex oxide nanoparticle assistant;
(2) Preparing catalyst slurry: adding 600 kg of titanium dioxide and 36 kg of nano-particle auxiliary agent into a mixing roll, and starting the mixing roll to stir uniformly; weighing 9.08 kg of ammonium metavanadate and 30.27 kg of ammonium heptamolybdate according to the proportion, adding the ammonium metavanadate into hot water with the mass of 360 kg and the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium heptamolybdate, continuously stirring until the ammonium metavanadate is completely dissolved, adding the prepared solution into the mixed powder, and stirring for 1 hour; then adding 17.15 kg of kaolin, 11.44 kg of glass fiber, 1.5 kg of paper fiber, 2.67 kg of hydroxypropyl methyl cellulose, 2.29 kg of polyvinyl alcohol and 3.05 kg of stearic acid, continuously stirring for 2 hours, and finally adding ammonia water to adjust the pH value of the pug to 9.0; collecting and wrapping the kneaded pug, and placing the pug indoors for aging for 48 hours;
(3) Extruding and molding the catalyst: installing a filter screen at the outlet of the extruder, and filtering the aged pug; installing a 30-hole honeycomb catalyst die at the outlet of the extruder, extruding and molding the filtered mud to obtain a honeycomb catalyst wet blank body, cutting the wet blank body to the length of 900 mm, and wrapping the wet blank body by using a thick paper shell;
(4) Drying a catalyst wet blank: conveying the wrapped honeycomb wet embryo body into a drying room for drying and dewatering, wherein the temperature in the drying room is sequentially set to be 25 ℃ for heat preservation for 48 hours, 40 ℃ for heat preservation for 24 hours, 50 ℃ for heat preservation for 24 hours, 60 ℃ for heat preservation for 24 hours, 80 ℃ for heat preservation for 24 hours, and (6 days) the water content of the honeycomb embryo body after drying is 4.1%;
(5) Roasting: uniformly placing the dried honeycomb catalyst blank on a roasting bracket, blocking the contact part of the bottom of the catalyst and the bracket and the catalyst on the upper layer and the lower layer by using asbestos ropes, and roasting the catalyst in a trolley type resistance furnace after the placement is finished, wherein the temperature rise procedure is 2 h to 100 ℃, the heat preservation is 2 h,3 h is carried out from 100 ℃ to 200 ℃, the heat preservation is 3 h,4 h is carried out from 200 ℃ to 300 ℃, the heat preservation is 3 h,4 h is carried out from 300 ℃ to 400 ℃, and the heat preservation is 3 h; and (4) slowly cooling after the baking and sintering, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature in the furnace reaches 35 ℃.
Preparation to obtain V 2 O 5 Content of 1%, moO 3 The content of the catalyst is 3.5%, the thickness of the inner wall of the catalyst is 0.8 mm, the thickness of the outer wall of the catalyst is 1.1 mm, and the length of the catalyst is 900 mm.
Example 3: a preparation method of a honeycomb type SCR catalyst comprises the following steps:
(1) Preparing the Sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent: respectively weighing 1.80 kg of stannous chloride dihydrate, 3.19 kg of lanthanum nitrate hexahydrate, 24.24 kg of ferric nitrate nonahydrate, 0.13 kg of lithium chloride, 182.68 kg of tetraethyl silicate and 26.51 kg of ethylenediamine tetraacetic acid, respectively dissolving the stannous chloride dihydrate with 1.7 kg of water, and dissolving the lanthanum nitrate hexahydrate, the ferric nitrate nonahydrate and the lithium chloride with 48.7 kg of water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, and continuously stirring until the solution becomes viscous paste; transferring the paste into a roasting vessel, heating to 300 ℃ using a trolley oven and holding for 3 h, to obtain a 2% Sn-2% La-8% Fe-0.3% by weight Li-87.7% Si penta-complex oxide nanoparticle auxiliary;
(2) Preparing catalyst slurry: adding 600 kg of titanium dioxide and 60 kg of nano-particle auxiliary agent into a mixing roll, and starting the mixing roll to stir uniformly; weighing 9.26 kg of ammonium metavanadate and 28.92 kg of ammonium metatungstate according to a ratio, adding the ammonium metavanadate into hot water with the mass of 360 kg and the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium metatungstate, continuously stirring until the ammonium metavanadate is completely dissolved, adding the prepared solution into the mixed powder, and stirring for 1 hour; then adding 61.2 kg of kaolin, 47.6 kg of glass fiber, 2.72 kg of paper fiber, 10.88 kg of hydroxypropyl methyl cellulose, 5.44 kg of polyvinyl alcohol and 8.16 kg of stearic acid, continuously stirring for 2 hours, and finally adding ammonia water to adjust the pH value of the pug to 9.0; collecting and wrapping the kneaded pug, and placing the pug indoors for aging for 48 hours;
(3) Extruding and molding the catalyst: installing a filter screen at the outlet of the extruder, and filtering the aged pug; installing an 18-hole honeycomb catalyst die at the outlet of the extruder, extruding and molding the filtered mud to obtain a honeycomb catalyst wet blank body, cutting the wet blank body to the length of 850 mm, and wrapping the wet blank body with a thick paper shell;
(4) Drying a catalyst wet blank: conveying the wrapped honeycomb wet embryo body into a drying room for drying and dewatering, wherein the temperature in the drying room is sequentially set as 25 ℃ for 36 h,30 ℃ for 36 h,50 ℃ for 24 h and 60 ℃ for 24 h, and the water content of the honeycomb embryo body is 4.7% after drying (5 days);
(5) Roasting: uniformly placing the dried honeycomb catalyst blank on a roasting bracket, blocking the contact part of the bottom of the catalyst and the bracket and the catalyst on the upper layer and the lower layer by using asbestos ropes, and roasting the catalyst in a trolley type resistance furnace after the placement is finished, wherein the temperature rise procedure is 2 h to 100 ℃, the heat preservation is 2 h,3 h is carried out from 100 ℃ to 200 ℃, the heat preservation is 3 h,4 h is carried out from 200 ℃ to 300 ℃, the heat preservation is 3 h,4 h is carried out from 300 ℃ to 400 ℃, and the heat preservation is 3 h; and slowly cooling after the baking and sintering process, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature in the furnace reaches 45 ℃.
Preparation to obtain V 2 O 5 Content of 0.9%, WO 3 The content is 3%, the thickness of the inner wall is 1.1 mm, the thickness of the outer wall is 1.5 mm, and the length is 850 mm.
Example 4: a preparation method of a honeycomb type SCR catalyst comprises the following steps:
(1) Preparing an Sn-La-Fe-Li-Si quinary composite oxide nanoparticle auxiliary agent: respectively weighing 2.02 kg of stannous chloride dihydrate, 2.15 kg of lanthanum nitrate hexahydrate, 23.18 kg of ferric nitrate nonahydrate, 0.08 kg of lithium chloride, 163.66 kg of tetraethyl silicate and 21.02 kg of ethylene diamine tetraacetic acid, respectively dissolving the stannous chloride dihydrate with 2 kg of water, and dissolving the lanthanum nitrate hexahydrate, the ferric nitrate nonahydrate and the lithium chloride with 58 kg of water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, and continuously stirring until the solution becomes viscous paste; transferring the paste into a roasting vessel, heating to 300 ℃ using a car oven and holding for 3 h, to obtain a 2.5% Sn-1.5% La-8.5% Fe-0.2% Li-87.3% Si penta-composite oxide nanoparticle auxiliary;
(2) Preparing catalyst slurry: adding 600 kg of titanium dioxide and 54 kg of nano-particle auxiliary agent into a mixing roll, and starting the mixing roll to stir uniformly; weighing 14.84 kg of ammonium metavanadate and 28.27 kg of ammonium heptamolybdate according to the proportion, adding the ammonium metavanadate into hot water with the mass of 310 kg and the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium heptamolybdate, continuously stirring until the ammonium metavanadate is completely dissolved, adding the prepared solution into the mixed powder, and stirring for 1 hour; then adding 38.55 kg of kaolin, 33.73 kg of glass fiber, 2.89 kg of paper fiber, 7.71 kg of hydroxypropyl methyl cellulose, 7.71 kg of polyvinyl alcohol and 5.78 kg of stearic acid, continuously stirring for 2 hours, and finally adding ammonia water to adjust the pH value of the pug to 8.5; collecting and wrapping the kneaded pug, and placing the pug indoors for aging for 48 hours;
(3) Extruding and molding the catalyst: installing a filter screen at the outlet of the extruder, and filtering the aged pug; installing a 25-hole honeycomb catalyst die at the outlet of the extruder, extruding and molding the filtered mud to obtain a honeycomb catalyst wet blank body, cutting the wet blank body to the length of 950 mm, and wrapping the wet blank body with a thick paper shell;
(4) Drying a catalyst wet blank: conveying the wrapped honeycomb wet embryo body into a drying room for drying and dewatering, wherein the temperature in the drying room is sequentially set to be 25 ℃, 36 h for heat preservation at 35 ℃, 36 h for heat preservation at 55 ℃, 24 h for heat preservation at 65 ℃, 12 h for heat preservation at 80 ℃, and the water content of the honeycomb embryo body after drying is 3.3 percent (6 days);
(5) Roasting: uniformly placing the dried honeycomb catalyst blank on a roasting bracket, using asbestos ropes to block the contact part of the bottom of the catalyst and the bracket and the catalyst bodies on the upper layer and the lower layer, and sending the honeycomb catalyst blank into a trolley type resistance furnace for roasting after the placement is finished, wherein the temperature rise procedure is 2 h to 100 ℃, the heat preservation is 2 h,3 h is carried out from 100 ℃ to 200 ℃, the heat preservation is 3 h,4 h is carried out from 200 ℃ to 300 ℃, the heat preservation is 3 h,4 h is carried out from 300 ℃ to 400 ℃, and the heat preservation is 3 h; and (4) slowly cooling after the baking and sintering, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature in the furnace reaches 40 ℃.
V 2 O 5 Content of 1.5%, moO 3 The content is 3%, the thickness of the inner wall is 0.9 mm, the thickness of the outer wall is 1.2 mm, and the length is 950 mm.
Four commercial honeycomb type SCR denitration catalysts are selected as comparative examples and are respectively compared with the catalysts of examples 1-4 of the invention in compressive strength and denitration activity.
Comparative example 1: v 2 O 5 Content of 0.9%, WO 3 The content is 4.5 percent, the number of the holes is 25, the thickness of the inner wall is 0.9 mm, the thickness of the outer wall is 1.3 mm,
comparative example 2: v 2 O 5 Content of 1%, moO 3 The content is 4 percent, the number of the holes is 30, the thickness of the inner wall is 0.8 mm, the thickness of the outer wall is 1.2 mm,
comparative example 3: v 2 O 5 Content 1.1%, WO 3 The content is 3.5 percent, the number of holes is 18,the thickness of the inner wall is 1.0 mm, the thickness of the outer wall is 1.5 mm,
comparative example 4: v 2 O 5 Content of MoO is 1.6% 3 The content is 3.5%, the number of holes is 25, the thickness of the inner wall is 0.9 mm, and the thickness of the outer wall is 1.3 mm.
The four catalysts were subjected to compressive strength test according to the test method in the standard "honeycomb type flue gas denitration catalyst" (GB/T31587-2015), and the test results are shown in table 1.
TABLE 1 compression Strength comparison test results
As can be seen from Table 1, in the four groups of test results, the compressive strength of the catalyst of the embodiment of the invention is superior to that of the comparative example, and the axial compressive strength and the radial compressive strength can respectively reach more than 4.0 MPa and more than 1.5 MPa. Through the comparison, compared with a commercial honeycomb SCR denitration catalyst with similar formula, hole number and wall thickness, the honeycomb catalyst provided by the invention has better mechanical strength.
According to NO concentration 450 mg/m 3 Ammonia nitrogen ratio of 1.0, SO 2 The concentration is 3000 mg/m 3 、O 2 Content 4% H 2 The O content is 8 percent, and the airspeed is 6000 h -1 The denitration activity of the catalysts of the comparative example and the example is tested under the conditions of 250 ℃ and 350 ℃ by setting a simulated flue gas, and the test results are shown in figures 1 and 2.
As can be seen from fig. 1 and 2, the denitration activities of the catalysts of the examples are better than those of the catalysts of the comparative examples under different test temperature conditions, i.e., the honeycomb catalyst provided by the present invention has excellent denitration activity, and the activity is not lower than that of the commercial catalysts of similar formulations.
Claims (8)
1. A honeycomb formula SCR denitration catalyst which characterized in that: the catalyst is obtained by extrusion forming, drying and roasting of catalyst slurry, wherein anatase type TiO is adopted in the catalyst slurry 2 As a carrier, sn-La-Fe-Li-Si quinary composite oxide nano particles are used as a catalyst slurry additive, V 2 O 5 As a catalystActive ingredient, WO 3 Or MoO 3 Is a coagent.
2. The honeycomb SCR denitration catalyst of claim 1, wherein: the catalyst slurry additive Sn-La-Fe-Li-Si five-element composite oxide nano-particles comprise the following components in oxide form, wherein the mass ratio of the oxides is as follows: 1.8-3:1-2.5:7-9:0.2-0.5:87.3-87.7.
3. The honeycomb SCR denitration catalyst of claim 1, wherein: the catalyst slurry auxiliary agent Sn-La-Fe-Li-Si five-membered composite oxide nano-particles have the particle size range of 3-10 nm, and the specific surface area of the catalyst slurry auxiliary agent is more than 150 m 2 /g。
4. The honeycomb SCR denitration catalyst of claim 1, wherein: the catalyst slurry auxiliary agent Sn-La-Fe-Li-Si five-element composite oxide nano particles occupy TiO carrier 2 6-10% of the mass.
5. The honeycomb SCR denitration catalyst of claim 1, wherein: active ingredient V in the catalyst 2 O 5 The mass of the catalyst slurry is 0.8-1.5% of the total mass of the catalyst slurry, and the active auxiliary agent WO 3 Or MoO 3 The mass of the catalyst slurry is 2-4% of the total mass of the catalyst slurry.
6. The honeycomb SCR denitration catalyst of any one of claims 1 to 5, wherein: the catalyst slurry also comprises a forming assistant accounting for 3.5-11.5% by mass, wherein the forming assistant comprises the following components in percentage by mass: 40 to 45 percent of kaolin, 30 to 35 percent of glass fiber, 2 to 4 percent of paper fiber, 4 to 8 percent of hydroxypropyl methyl cellulose, 4 to 8 percent of polyvinyl alcohol and 4 to 8 percent of stearic acid.
7. The preparation method of the honeycomb type SCR denitration catalyst is characterized by comprising the following steps: the method comprises the following steps:
(1) Preparation of an auxiliary agent: weighing stannous chloride dihydrate, lanthanum nitrate hexahydrate, ferric nitrate nonahydrate, lithium chloride, tetraethyl silicate and ethylenediamine tetraacetic acid according to a proportion, firstly dissolving the stannous chloride dihydrate by using deionized water, and then mixing and dissolving the three substances of the lanthanum nitrate hexahydrate, the ferric nitrate nonahydrate and the lithium chloride by using the deionized water; mixing the two solutions, adding tetraethyl silicate and ethylene diamine tetraacetic acid, heating the mixed solution to 95 ℃, continuously stirring, transferring the paste into a roasting vessel when the solution becomes viscous paste, heating to 300 ℃ by using a trolley furnace, roasting, keeping the temperature, and obtaining the Sn-La-Fe-Li-Si five-membered composite oxide nanoparticle auxiliary agent after roasting;
(2) Preparation of catalyst slurry: weighing ammonium metavanadate, ammonium metatungstate or ammonium heptamolybdate according to a proportion, firstly adding the ammonium metavanadate into hot water at the temperature of 95 ℃, slowly adding ethanolamine to completely dissolve the ammonium metavanadate, then adding the ammonium metatungstate or ammonium heptamolybdate, and continuously stirring until the ammonium metavanadate and the ammonium heptamolybdate are completely dissolved to obtain an active solution; weighing titanium dioxide and Sn-La-Fe-Li-Si pentabasic composite oxide nanoparticle auxiliary agent according to a proportion, adding the titanium dioxide and the Sn-La-Fe-Li-Si pentabasic composite oxide nanoparticle auxiliary agent into a mixing roll for premixing, sequentially adding the prepared active solution, stirring for 1 hour, adding the forming auxiliary agent, stirring, and adjusting the pH value of the pug to be 8.0-9.0; collecting and wrapping the pug, and then placing the pug in a room temperature environment for aging;
(3) Extruding and molding the catalyst: installing a mould at the outlet of the extruder, extruding and molding the filtered mud to obtain a honeycomb catalyst wet blank, and wrapping the honeycomb wet blank cut to a fixed length by a thick paper shell;
(4) Drying the catalyst: drying and dewatering the honeycomb wet embryo body, gradually raising the temperature of a drying room within 25-80 ℃, and finishing the drying when the water content of the honeycomb wet embryo body reaches below 5%;
(5) Roasting the catalyst: and (3) carrying out sectional roasting in a trolley type resistance furnace, slowly cooling after roasting is finished, wherein the cooling rate is not more than 3 ℃/min, and opening the furnace to take out the prepared honeycomb type SCR denitration catalyst when the temperature is reduced to below 45 ℃.
8. The method of preparing a honeycomb SCR denitration catalyst according to claim 7, characterized in that: when the step (5) is carried out by stage roasting: the temperature raising program comprises four stages, wherein the first stage is raising the temperature to 100 ℃ within 2 h, keeping the temperature for 2 h, the second stage is raising the temperature from 100 ℃ to 200 ℃ within 3 h, keeping the temperature for 3 h, the third stage is raising the temperature from 200 ℃ to 300 ℃ within 4 h, keeping the temperature for 3 h, and the fourth stage is raising the temperature from 300 ℃ to 400 ℃ within 4 h, and keeping the temperature for 3 h.
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| CN115970689A (en) * | 2022-12-30 | 2023-04-18 | 南京环福新材料科技有限公司 | CH using waste vanadium-titanium denitration catalyst as raw material 4 -SCR catalyst and method for producing the same |
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| JP2004018361A (en) * | 2002-06-20 | 2004-01-22 | Toshiba Corp | Metal grain-supporting compound oxide sintered compact and method of producing the same |
| CN110639504A (en) * | 2019-11-06 | 2020-01-03 | 山东博霖环保科技发展有限公司 | Honeycomb type low-temperature flue gas denitration catalyst and preparation method thereof |
| CN111013620A (en) * | 2019-12-18 | 2020-04-17 | 夏丽丹 | Wear-resistant mixed metal oxide catalyst and preparation method thereof |
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| CA1194850A (en) * | 1981-11-24 | 1985-10-08 | Tetsuji Ono | Method for manufacture of honeycomb catalyst |
| JP2004018361A (en) * | 2002-06-20 | 2004-01-22 | Toshiba Corp | Metal grain-supporting compound oxide sintered compact and method of producing the same |
| CN110639504A (en) * | 2019-11-06 | 2020-01-03 | 山东博霖环保科技发展有限公司 | Honeycomb type low-temperature flue gas denitration catalyst and preparation method thereof |
| CN111013620A (en) * | 2019-12-18 | 2020-04-17 | 夏丽丹 | Wear-resistant mixed metal oxide catalyst and preparation method thereof |
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