CN105148904A - Flue gas denitration catalyst applied at a low temperature and preparation method thereof - Google Patents
Flue gas denitration catalyst applied at a low temperature and preparation method thereof Download PDFInfo
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- CN105148904A CN105148904A CN201510540321.5A CN201510540321A CN105148904A CN 105148904 A CN105148904 A CN 105148904A CN 201510540321 A CN201510540321 A CN 201510540321A CN 105148904 A CN105148904 A CN 105148904A
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Abstract
The invention relates to a catalyst and a preparation method thereof, in particular to a flue gas denitration catalyst applied at a low temperature and a preparation method thereof. TiO2 doped with one or multiple of Al2O3, SiO2 or ZrO2 is taken as a carrier, glass fiber is taken as a skeleton, and vanadium compounded with one or multiple of tungsten, molybdenum, cerium, manganese, niobium or phosphorus is taken as an active component. The flue gas denitration catalyst comprises the carrier, active precursor aqueous solution, glass fiber, stearic acid, lactic acid, wood pulp, monoethanolamine, polyoxyethylene, methylcellulose, ammonia water and water. The catalyst has good low-temperature denitration activity; and within the temperature of 150-300 DEG C, denitration efficiency of the catalyst is up to 85% or above. The catalyst has high sulfur-poisoning resistance and water-poisoning resistance capacity, and long-term use of the catalyst at a low temperature is guaranteed. Further, the catalyst can be applied to fields such as glass production, coking, cement, industrial kilns, waste incineration and chemical engineering widely. The invention further provides a preparation method of the catalyst, which is reasonable in processing.
Description
Technical field
The present invention relates to a kind of Catalysts and its preparation method, be specifically related to a kind of for catalyst for denitrating flue gas under cryogenic conditions and preparation method thereof.
Background technology
Along with the increasingly stringent of environmental requirement, except coal fired power plant, glass, coking, cement, Industrial Stoves, the waste gas of the industry such as waste incineration and chemical plant discharge also needs to carry out denitration process.In numerous method of denitration, SCR (SCR) technology is widely adopted well because denitration efficiency is high, selective.This technology, mainly under denitrating catalyst existent condition, adopts NH
3as reducing agent, by NOx (mainly NO and NO in flue gas
2) be reduced to N
2, generate H simultaneously
2o.Wherein most crucial parts are denitrating catalysts, determine that the key of these technology success or failure is activity of denitrating catalyst under operating condition, the selective and life-span.
Because the denitration transformation of China takes the lead in from coal fired power plant, domestic the denitrating catalyst introduced or develop is mainly for the flue gas situation of coal fired power plant.The features such as the flue gas of coal fired power plant has temperature high (300 ~ 420 DEG C), stable, and in flue gas impurity content is few, denitrating catalyst is active high, selective good under this operating mode, long service life.Compared to coal fired power plant, glass, coking, cement, Industrial Stoves, the flue-gas temperature of the industry such as waste incineration and chemical plant discharge lower (often through flue gas that waste heat boiler gives off), temperature range concentrates between 150 ~ 300 DEG C (note: the decline of the activity with temperature of denitrating catalyst and reduce), SO
2and H
2o concentration is high, run fluctuation large (fluctuation of operation can cause the fluctuation of flue-gas temperature larger), the denitrating catalyst of current extensive use is difficult to adapt to this kind of operating mode, therefore under developing a kind of cryogenic conditions, (150 ~ 300 DEG C) are active high, and the catalyst that sulfur resistive water resistant poisoning capability is strong is necessary.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of for the catalyst for denitrating flue gas under cryogenic conditions, in 150 ~ 300 DEG C of temperature ranges, denitration efficiency all can reach more than 85%, and sulfur resistive water resistant poisoning capability is strong, can Long-Time Service under ensureing low temperature.
Of the present invention for the catalyst for denitrating flue gas under cryogenic conditions, with TiO
2doped with Al
2o
3, SiO
2or ZrO
2in one or more be carrier, take glass fibre as skeleton, with one or more in vanadium composite tungsten, molybdenum, cerium, manganese, niobium or phosphorus for active component.
Wherein:
The weight fraction that preferred vanadium accounts for active component is 5-20%; Carrier is preferably TiO
2composite S iO
2or ZrO
2in one or both, when carrier is TiO
2composite S iO
2time, TiO
2with SiO
2weight ratio be 99.5 ~ 98:0.5 ~ 2; When carrier is TiO
2compound ZrO
2time, TiO
2with ZrO
2weight ratio be 99.5 ~ 95:0.5 ~ 5; When carrier is TiO
2composite S iO
2and ZrO
2time, TiO
2, SiO
2, ZrO
2weight ratio be 99 ~ 93:0.5 ~ 2:0.5 ~ 5.
Of the present invention for the catalyst for denitrating flue gas under cryogenic conditions, comprise the composition of following parts by weight: carrier 550-600 weight portion, skeleton 20-40 weight portion and active component 30-80 weight portion.
Described for the catalyst for denitrating flue gas under cryogenic conditions, comprise the raw material of following parts by weight: carrier 550-600 weight portion, active component precursor water solution and glass fibre 20-40 weight portion, in active component in active component precursor water solution, weight content is 30-80 weight portion; Active component precursor water solution preferred mass concentration is 10 ~ 50%.Also comprise the raw material of following parts by weight: stearic acid 1-3 weight portion, lactic acid 5-8 weight portion, wood pulp 2-5 weight portion, MEA 5-15 weight portion, polyethylene glycol oxide 3-7 weight portion, methylcellulose 3-7 weight portion, concentration are ammoniacal liquor 50-90 weight portion and the water 200-270 weight portion of 15-25%.
Preparation method for the catalyst for denitrating flue gas under cryogenic conditions of the present invention, comprise batch mixing, batch mixing comprises the following steps:
Step 1: Component Vectors is added powerful mixing roll, then adds stearic acid, ammoniacal liquor that lactic acid, moiety concentrations are 15-25% and part water carries out mixing;
Step 2: again Component Vectors and part water are joined carry out in powerful mixing roll mixing;
Step 3: again the ammoniacal liquor of remaining carrier, part 15-25% and remaining water are joined carry out in powerful mixing roll mixing, when pug temperature reaches more than 95 DEG C, discharge the gas that mixing pug produces, the moisture in pug reaches 26.5-28.5%, end step 3;
Step 4: again glass fibre, wood pulp and active component precursor water solution are joined carry out in powerful mixing roll mixing, when the moisture in pug reaches 30-32%, end step 4;
Step 5: again methylcellulose and polyethylene glycol oxide are joined carry out in powerful mixing roll mixing;
Step 6: the ammoniacal liquor being 15-25% by methylcellulose and polyethylene glycol oxide and remaining concentration again joins and carries out mixing in powerful mixing roll, when the moisture of pug reaches 28-29%, terminates mixing.
As a kind of preferred version, batch mixing comprises the following steps:
Step 1: the carrier of 340-360 weight portion is added powerful mixing roll, then adds the stearic acid of 1-3 weight portion, the lactic acid of 5-8 weight portion, the water of 190-250 weight portion, the ammoniacal liquor of 40-60 weight portion 15-25%, mixing time is 10-20 minute, and the temperature of pug is greater than 70 DEG C;
Step 2: joined by the water of the carrier of 100-120 weight portion and 10-20 weight portion and carry out mixing in powerful mixing roll, mixing time is 15-30 minute;
Step 3: again by the carrier of 110-120 weight portion, the ammoniacal liquor of the 15-25% of 5-15 weight portion join carry out in powerful mixing roll mixing, when pug temperature reaches 95 DEG C, discharge the gas that mixing pug produces, the moisture that step 3 terminates in rear pug reaches 26.5-28.5%;
Step 4: again by the wood pulp of the glass fibre of 20-40 weight portion, 2-5 weight portion and containing the active component precursor water solution of MEA join carry out in powerful mixing roll mixing, wherein: active component weight content is 30-80 weight portion, MEA weight content is 10-15 part, when the moisture in pug reaches 30-32%, end step 4;
Step 5: again the polyethylene glycol oxide of the methylcellulose of 1.5-3.5 weight portion and 1.5-3.5 weight portion is joined carry out in powerful mixing roll mixing, mixing 15 minutes;
Step 6: again the ammoniacal liquor of the methylcellulose of 1.5-3.5 weight portion and the polyethylene glycol oxide of 1.5-3.5 weight portion and the 15-25% of 5-15 weight portion is joined and carry out mixing in powerful mixing roll, when the moisture of pug reaches 28-29%, terminate mixing.
Preparation method for the catalyst for denitrating flue gas under cryogenic conditions of the present invention, comprises the following steps:
(1) batch mixing
(2) mediate
The pug mixed is put into Dual-screw kneader mediate, the time is 30-60 minute;
(3) filter
Add kneaded pug to filter hopper, screen cloth is equipped with in filter outlet, carries out combing to pug;
(4) pressed compact
Pug after filtration joins the preformed of pre-extruded machine, and preformed pug is cut into square stripping and slicing by steel wire on pre-extruded conveyer;
(5) extrude
Extruding the stage, the pug of pre-extruded is extruded as honeycomb ceramics by extruder;
(6) dry
The product extruded is carried out drying;
(7) calcine
Calcined by the product obtained after drying, the control of calcining heat is within 500-650 DEG C, and calcination time controls at 25-33 hour.
Wherein:
Step (6) drying is primary drying and redrying, and dry humidity, for be warming up to 60 DEG C by 20 DEG C, is down to 20% by 80% by primary drying, and the time is 10-15 days; The temperature of redrying is 50-65 DEG C, and the time is 40-48 hour.
In step (7), calcining is for be placed on the guipure of mesh-belt kiln by dried product, and orientation is consistent with the direction that guipure runs.
In sum, the present invention has the following advantages:
(1) to have good low-temperature denitration active for catalyst of the present invention, and in 150 ~ 300 DEG C of temperature ranges, denitration efficiency all can reach more than 85%, and this catalyst sulfur resistive water resistant poisoning capability is strong, can ensure Long-Time Service under low temperature; This catalyst can be widely used in glass, coking, cement, Industrial Stoves, the industry such as waste incineration and chemical industry.
(2) the present invention also provides its preparation method, rational technology.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
For the catalyst for denitrating flue gas under cryogenic conditions, with TiO
2composite S iO
2and ZrO
2for carrier, TiO
2, SiO
2, ZrO
2weight ratio be 95:1:2, take glass fibre as skeleton, with vanadium compound manganese for active component, the weight fraction that vanadium accounts for active component is 10%.
Preparation method is:
(1) batch mixing
Step 1: the carrier of 350 weight portions is added powerful mixing roll, then adds the stearic acid of 2 weight portions, the lactic acid of 5 weight portions, the water of 220 weight portions, the ammoniacal liquor of 50 weight portions 20%, and mixing time is 15 minutes, and the temperature of pug is greater than 70 DEG C;
Step 2: joined by the water of the carrier of 110 weight portions and 15 weight portions and carry out mixing in powerful mixing roll, mixing time is 20 minutes;
Step 3: by the carrier of 110 weight portions, 5 weight portions 25% ammoniacal liquor join carry out in powerful mixing roll mixing, when pug temperature reaches 95 DEG C, discharge mixing pug produce gas, the moisture that step 3 terminates in rear pug reaches 27.5%;
Step 4: by the wood pulp of the glass fibre of 30 weight portions, 3 weight portions and containing the active component precursor water solution of MEA join carry out in powerful mixing roll mixing, wherein: active component weight content is 50 weight portions, MEA weight content is 12 parts, when the moisture in pug reaches 31%, end step 4;
Step 5: the polyethylene glycol oxide of the methylcellulose of 2 weight portions and 2 weight portions is joined carry out in powerful mixing roll mixing, mixing 15 minutes;
Step 6: the ammoniacal liquor of the methylcellulose of 2 weight portions and the polyethylene glycol oxide of 2 weight portions and 20% of 10 weight portions is joined and carries out mixing in powerful mixing roll, when the moisture of pug reaches 28.5%, terminate mixing.
(2) mediate
The pug mixed is put into Dual-screw kneader mediate, the time is 40 minutes;
(3) filter
Add kneaded pug to filter hopper, screen cloth is equipped with in filter outlet, carries out combing to pug;
(4) pressed compact
Pug after filtration joins the preformed of pre-extruded machine, and preformed pug is cut into square stripping and slicing by steel wire on pre-extruded conveyer;
(5) extrude
Extruding the stage, the pug of pre-extruded is extruded as honeycomb ceramics by extruder;
(6) dry
Step (6) drying is primary drying and redrying, and dry humidity, for be warming up to 60 DEG C by 20 DEG C, is down to 20% by 80% by primary drying; The temperature of redrying is 55 DEG C, and the time is 44 hours;
(7) calcine
Calcined by the product obtained after drying, the control of calcining heat is within 600 DEG C, and calcination time controlled at 30 hours.
Be used for by catalyst prepared by embodiment 1 in the fume treatment of certain coke-oven plant discharge, flue-gas temperature is 200 ± 10 DEG C, and in flue gas, water content is 10%, SO
2concentration is 5000mg/Nm
3(wet basis, actual oxygen), after catalyst treatment prepared by embodiment 1, denitration efficiency is 88%, and long-play is stablized.
Embodiment 2
For the catalyst for denitrating flue gas under cryogenic conditions, with TiO
2composite S iO
2for carrier, TiO
2with SiO
2weight ratio be 99.5:2, take glass fibre as skeleton, with vanadium composite tungsten, molybdenum and cerium for active component, the weight fraction that vanadium accounts for active component is 5%.
Preparation method is:
Step 1: the carrier of 340 weight portions is added powerful mixing roll, then adds the stearic acid of 1 weight portion, the lactic acid of 7 weight portions, the water of 190 weight portions, the ammoniacal liquor of 40 weight portions 25%, and mixing time is 10 minutes, and the temperature of pug is greater than 70 DEG C;
Step 2: joined by the water of the carrier of 120 weight portions and 20 weight portions and carry out mixing in powerful mixing roll, mixing time is 30 minutes;
Step 3: by the carrier of 120 weight portions, 15 weight portions 15% ammoniacal liquor join carry out in powerful mixing roll mixing, when pug temperature reaches 95 DEG C, discharge mixing pug produce gas, the moisture that step 3 terminates in rear pug reaches 26.5%;
Step 4: by the wood pulp of the glass fibre of 30 weight portions, 3 weight portions and containing the active component precursor water solution of MEA join carry out in powerful mixing roll mixing, wherein: active component weight content is 30 weight portions, MEA weight content is 10 parts, when the moisture in pug reaches 30%, end step 4;
Step 5: the polyethylene glycol oxide of the methylcellulose of 1.5 weight portions and 3.5 weight portions is joined carry out in powerful mixing roll mixing, mixing 15 minutes;
Step 6: the ammoniacal liquor of the methylcellulose of 1.5 weight portions and the polyethylene glycol oxide of 3.5 weight portions and 25% of 5 weight portions is joined and carries out mixing in powerful mixing roll, when the moisture of pug reaches 29%, terminate mixing.
(2) mediate
The pug mixed is put into Dual-screw kneader mediate, the time is 30 minutes;
(3) filter
Add kneaded pug to filter hopper, screen cloth is equipped with in filter outlet, carries out combing to pug;
(4) pressed compact
Pug after filtration joins the preformed of pre-extruded machine, and preformed pug is cut into square stripping and slicing by steel wire on pre-extruded conveyer;
(5) extrude
Extruding the stage, the pug of pre-extruded is extruded as honeycomb ceramics by extruder;
(6) dry
Step (6) drying is primary drying and redrying, and dry humidity, for be warming up to 60 DEG C by 20 DEG C, is down to 20% by 80% by primary drying; The temperature of redrying is 50 DEG C, and the time is 48 hours;
(7) calcine
Calcined by the product obtained after drying, the control of calcining heat is within 650 DEG C, and calcination time controlled at 25 hours.
Be used for by catalyst prepared by embodiment 2 in the fume treatment of certain garbage burning factory discharge, flue-gas temperature is 280 ± 10 DEG C, and in flue gas, water content is 15%, SO
2concentration is 3500mg/Nm
3(wet basis, actual oxygen), after catalyst treatment prepared by embodiment 2, denitration efficiency is 90%, and long-play is stablized.
Embodiment 3
For the catalyst for denitrating flue gas under cryogenic conditions, with TiO
2compound ZrO
2for carrier, TiO
2with ZrO
2weight ratio be 95:5, take glass fibre as skeleton, with vanadium composite niobium for active component, the weight fraction that vanadium accounts for active component is 20%.
Preparation method is:
Step 1: the carrier of 360 weight portions is added powerful mixing roll, then adds the stearic acid of 3 weight portions, the lactic acid of 8 weight portions, the water of 250 weight portions, the ammoniacal liquor of 60 weight portions 15%, and mixing time is 20 minutes, and the temperature of pug is greater than 70 DEG C;
Step 2: joined by the water of the carrier of 100 weight portions and 10 weight portions and carry out mixing in powerful mixing roll, mixing time is 15 minutes;
Step 3: by the carrier of 115 weight portions, 10 weight portions 20% ammoniacal liquor join carry out in powerful mixing roll mixing, when pug temperature reaches 95 DEG C, discharge mixing pug produce gas, the moisture that step 3 terminates in rear pug reaches 28.5%;
Step 4: by the wood pulp of the glass fibre of 30 weight portions, 3 weight portions and containing the active component precursor water solution of MEA join carry out in powerful mixing roll mixing, wherein: active component weight content is 80 weight portions, MEA weight content is 15 parts, when the moisture in pug reaches 32%, end step 4;
Step 5: the polyethylene glycol oxide of the methylcellulose of 3.5 weight portions and 1.5 weight portions is joined carry out in powerful mixing roll mixing, mixing 15 minutes;
Step 6: the ammoniacal liquor of the methylcellulose of 3.5 weight portions and the polyethylene glycol oxide of 1.5 weight portions and 15% of 15 weight portions is joined and carries out mixing in powerful mixing roll, when the moisture of pug reaches 28%, terminate mixing.
(2) mediate
The pug mixed is put into Dual-screw kneader mediate, the time is 60 minutes;
(3) filter
Add kneaded pug to filter hopper, screen cloth is equipped with in filter outlet, carries out combing to pug;
(4) pressed compact
Pug after filtration joins the preformed of pre-extruded machine, and preformed pug is cut into square stripping and slicing by steel wire on pre-extruded conveyer;
(5) extrude
Extruding the stage, the pug of pre-extruded is extruded as honeycomb ceramics by extruder;
(6) dry
Step (6) drying is primary drying and redrying, and dry humidity, for be warming up to 60 DEG C by 20 DEG C, is down to 20% by 80% by primary drying; The temperature of redrying is 65 DEG C, and the time is 40 hours;
(7) calcine
Calcined by the product obtained after drying, the control of calcining heat is within 500 DEG C, and calcination time controlled at 33 hours.
Be used in the fume treatment of certain chemical plant emission by catalyst prepared by embodiment 3, flue-gas temperature is 170 ± 10 DEG C, and in flue gas, water content is 8.5%, SO
2concentration is 2300mg/Nm
3(wet basis, actual oxygen), after catalyst treatment prepared by embodiment 3, denitration efficiency is 86%, and long-play is stablized.
Claims (10)
1. for the catalyst for denitrating flue gas under cryogenic conditions, it is characterized in that: with TiO
2doped with Al
2o
3, SiO
2or ZrO
2in one or more be carrier, take glass fibre as skeleton, with one or more in vanadium composite tungsten, molybdenum, cerium, manganese, niobium or phosphorus for active component.
2. according to claim 1 for the catalyst for denitrating flue gas under cryogenic conditions, it is characterized in that: the weight fraction that vanadium accounts for active component is 5-20%; Carrier is TiO
2composite S iO
2or ZrO
2in one or both.
3. according to claim 1 for the catalyst for denitrating flue gas under cryogenic conditions, it is characterized in that: the composition comprising following parts by weight: carrier 550-600 weight portion, skeleton 20-40 weight portion and active component 30-80 weight portion.
4. according to claim 1 for the catalyst for denitrating flue gas under cryogenic conditions, it is characterized in that: the raw material comprising following parts by weight: carrier 550-600 weight portion, active component precursor water solution and glass fibre 20-40 weight portion, in active component in active component precursor water solution, weight content is 30-80 weight portion.
5. according to claim 4 for the catalyst for denitrating flue gas under cryogenic conditions, it is characterized in that: the raw material also comprising following parts by weight: stearic acid 1-3 weight portion, lactic acid 5-8 weight portion, wood pulp 2-5 weight portion, MEA 5-15 weight portion, polyethylene glycol oxide 3-7 weight portion, methylcellulose 3-7 weight portion, concentration are ammoniacal liquor 50-90 weight portion and the water 200-270 weight portion of 15-25%.
6. the arbitrary described preparation method for the catalyst for denitrating flue gas under cryogenic conditions of claim 1-5, it is characterized in that: comprise batch mixing, batch mixing comprises the following steps:
Step 1: Component Vectors is added powerful mixing roll, then adds stearic acid, ammoniacal liquor that lactic acid, moiety concentrations are 15-25% and part water carries out mixing;
Step 2: again Component Vectors and part water are joined carry out in powerful mixing roll mixing;
Step 3: again the ammoniacal liquor of remaining carrier, part 15-25% and remaining water are joined carry out in powerful mixing roll mixing, when pug temperature reaches more than 95 DEG C, discharge the gas that mixing pug produces, the moisture in pug reaches 26.5-28.5%, end step 3;
Step 4: again glass fibre, wood pulp and active component precursor water solution are joined carry out in powerful mixing roll mixing, when the moisture in pug reaches 30-32%, end step 4;
Step 5: again methylcellulose and polyethylene glycol oxide are joined carry out in powerful mixing roll mixing;
Step 6: the ammoniacal liquor being 15-25% by methylcellulose and polyethylene glycol oxide and remaining concentration again joins and carries out mixing in powerful mixing roll, when the moisture of pug reaches 28-29%, terminates mixing.
7. the preparation method for the catalyst for denitrating flue gas under cryogenic conditions according to claim 6, is characterized in that: batch mixing comprises the following steps:
Step 1: the carrier of 340-360 weight portion is added powerful mixing roll, then adds the stearic acid of 1-3 weight portion, the lactic acid of 5-8 weight portion, the water of 190-250 weight portion, the ammoniacal liquor of 40-60 weight portion 15-25%, mixing time is 10-20 minute, and the temperature of pug is greater than 70 DEG C;
Step 2: joined by the water of the carrier of 100-120 weight portion and 10-20 weight portion and carry out mixing in powerful mixing roll, mixing time is 15-30 minute;
Step 3: again by the carrier of 110-120 weight portion, the ammoniacal liquor of the 15-25% of 5-15 weight portion join carry out in powerful mixing roll mixing, when pug temperature reaches 95 DEG C, discharge the gas that mixing pug produces, the moisture that step 3 terminates in rear pug reaches 26.5-28.5%;
Step 4: again by the wood pulp of the glass fibre of 20-40 weight portion, 2-5 weight portion and containing the active component precursor water solution of MEA join carry out in powerful mixing roll mixing, wherein: active component weight content is 30-80 weight portion, MEA weight content is 10-15 part, when the moisture in pug reaches 30-32%, end step 4;
Step 5: again the polyethylene glycol oxide of the methylcellulose of 1.5-3.5 weight portion and 1.5-3.5 weight portion is joined carry out in powerful mixing roll mixing, mixing 15 minutes;
Step 6: again the ammoniacal liquor of the methylcellulose of 1.5-3.5 weight portion and the polyethylene glycol oxide of 1.5-3.5 weight portion and the 15-25% of 5-15 weight portion is joined and carry out mixing in powerful mixing roll, when the moisture of pug reaches 28-29%, terminate mixing.
8. the preparation method for the catalyst for denitrating flue gas under cryogenic conditions according to claim 7, is characterized in that: comprise the following steps:
(1) batch mixing
(2) mediate
The pug mixed is put into Dual-screw kneader mediate, the time is 30-60 minute;
(3) filter
Add kneaded pug to filter hopper, screen cloth is equipped with in filter outlet, carries out combing to pug;
(4) pressed compact
Pug after filtration joins the preformed of pre-extruded machine, and preformed pug is cut into square stripping and slicing by steel wire on pre-extruded conveyer;
(5) extrude
Extruding the stage, the pug of pre-extruded is extruded as honeycomb ceramics by extruder;
(6) dry
The product extruded is carried out drying;
(7) calcine
Calcined by the product obtained after drying, the control of calcining heat is within 500-650 DEG C, and calcination time controls at 25-33 hour.
9. the preparation method for the catalyst for denitrating flue gas under cryogenic conditions according to claim 8, it is characterized in that: step (6) drying is primary drying and redrying, dry humidity, for be warming up to 60 DEG C by 20 DEG C, is down to 20% by 80% by primary drying; The temperature of redrying is 50-65 DEG C, and the time is 40-48 hour.
10. the preparation method for the catalyst for denitrating flue gas under cryogenic conditions according to claim 8, it is characterized in that: in step (7), calcining is for be placed on the guipure of mesh-belt kiln by dried product, and orientation is consistent with the direction that guipure runs.
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| CN106732703A (en) * | 2016-12-16 | 2017-05-31 | 内蒙古华元科技有限公司 | One kind is for smoke denitration of cement plant Ti-base catalyst and preparation method thereof |
| CN106732530A (en) * | 2016-12-09 | 2017-05-31 | 内蒙古华元科技有限公司 | For sintering machine, the Ti-base catalyst of pellet denitrating flue gas and preparation method thereof |
| CN106984300A (en) * | 2017-05-26 | 2017-07-28 | 中国科学院生态环境研究中心 | A kind of vanadium titanium oxide catalyst and its production and use |
| CN107335427A (en) * | 2017-09-06 | 2017-11-10 | 华电青岛环保技术有限公司 | The preparation method of the porous SCR denitration of Gas Generator Set low temperature |
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| CN110385123A (en) * | 2019-08-02 | 2019-10-29 | 山东众皓环保科技有限公司 | It is effective against the denitrating catalyst and preparation method thereof of ammonium hydrogen sulfate murder by poisoning |
| CN112844424A (en) * | 2020-12-30 | 2021-05-28 | 山东天璨环保科技有限公司 | Low-temperature denitration catalyst and preparation method thereof |
| CN114210320A (en) * | 2021-12-31 | 2022-03-22 | 上海复翼环保科技有限公司 | Heterogeneous diatom low-temperature sulfur-resistant SCR catalyst and preparation method thereof |
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