CN111054319A - Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method - Google Patents
Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method Download PDFInfo
- Publication number
- CN111054319A CN111054319A CN201911336885.1A CN201911336885A CN111054319A CN 111054319 A CN111054319 A CN 111054319A CN 201911336885 A CN201911336885 A CN 201911336885A CN 111054319 A CN111054319 A CN 111054319A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- ammonium heptamolybdate
- denitration catalyst
- gas denitration
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
- B01J23/22—Vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a raw material, a catalyst and a preparation method for preparing a flue gas denitration catalyst by using ammonium heptamolybdate, wherein the preparation method comprises the following steps: (1) adding a certain amount of ammonium heptamolybdate aqueous solution into metatitanic acid, stirring for 1 hour, adding a certain amount of ammonia water, stirring for 1 hour, continuously adjusting the pH of the solution to about 8.5 by using the ammonia water, and then stirring for 2-3 hours to form a suspension; (2) filter pressing and calcining: filtering suspended matters in the suspension liquid by a plate-and-frame filter press to remove water and water-soluble impurities to form a semi-dry material, and feeding the semi-dry material into a rotary kiln to calcine at a certain temperature; (3) grinding detection: and grinding the kiln falling product by a micro powder mill to ensure that the particle size distribution of the finished product powder is detected by a laser particle size analyzer D50 to be within the interval of 1.0-1.2 mu m. The invention has the advantages that the raw material has lower sulfate radical content and more uniform molybdenum distribution, the low-temperature SCR flue gas denitration catalyst prepared by the method has low and stable catalytic activity temperature.
Description
Technical Field
The invention relates to the technical field of SCR denitration catalysis titanium dioxide production, in particular to a raw material and a catalyst for preparing a flue gas denitration catalyst by using ammonium heptamolybdate and a preparation method of the raw material and the catalyst.
Background
At present, the environment situation is severe, the country increasingly attaches importance to the ecological civilization construction, and the atmospheric pollution control becomes a key task in the ecological civilization construction. Following the pollution of smoke and sulfur dioxide, nitrogen oxide pollution is becoming an important atmospheric pollutant of social concern. The flue gas denitration of the thermal power generation industry starts to be gradually put on the SCR flue gas denitration plan in China before 2010, at present, all thermal power plants start to use flue gas denitration devices in order to meet the flue gas emission standard required by national regulations, but the nitrogen oxide emission of industrial kilns in non-electric industries, such as glass, coking, cement, steel and the like, still cannot be ignored, in the statistics table of the nitrogen oxide emission of all industries in the whole nation in 2014, the nitrogen oxide emission of the non-electric industries accounts for 38 percent, which is slightly higher than 32 percent of the electric power industry, and the nitrogen oxide emission standard of the non-electric industries is gradually improved along with the increasing of the national environmental pollution treatment and the continuous tightening of new environmental protection regulations. Wherein, the emission limit of nitrogen oxides is 500 mg/standard cubic meter required by the emission standard of pollutants for coking chemical industry (GB 16171-2012) which is executed in 2015 year in the coking industry, and the emission of nitrogen oxides in flue gas of key areas is 150 mg/standard cubic meter; the ceramic industry pollutant emission standard (GB 25464-; in the cement industry from 2016, 1 month and 1 day, new standards that nitrogen oxide emission of cement manufacturing enterprises cannot be higher than 200 mg/standard cubic meter are executed by Beijing, and the gradually improved nitrogen oxide emission standards require more efficient nitrogen oxide control technology. SCR flue gas denitration technique still is applicable to non-electricity trade, but has strict requirement to the screening of prescription, because SCR's operating temperature is more than 300 degrees, and non-electricity trade tail gas temperature is low, if additionally increase energy supply equipment, will aggravate the running cost of non-electricity trade certainly, and add equipment, also can increase the degree of difficulty for SCR denitrification facility steady operation. In the current situation, the low-temperature SCR denitration technology becomes the only way for the non-electric industry, and the low-temperature SCR denitration technology is a technology for realizing decomposition of nitrogen oxides by using the exhaust emission temperature of the normal non-electric industry or the temperature slightly lower than the normal exhaust emission temperature of the exhaust emission of a denitration device, and has the following difficulties: 1, in the range of 170-300 ℃, the activity of the denitration active substance is required to be high, 2, the reaction products of combustion by-products and flue gas after contacting with the catalyst are few, the inactivation of the catalyst is avoided, and the main toxic substance generated by the SCR denitration catalyst in the using process is ammonium sulfate. At present, many catalyst plants are also developing low-temperature denitration catalysts, which mainly use molybdenum-doped metal, and a Mo-V-Ti system can reduce the active temperature point of V, but only physically doped, so that the defects that: 1, the molybdenum metal is not mixed uniformly, the catalytic efficiency of the catalyst is unstable, 2, more ammonium sulfate is generated, and the ammonium sulfate is not decomposed due to low temperature and is accumulated on the surface of the catalyst to cause the inactivation of the catalyst.
Chinese patent publication No. CN108212180A discloses a titanium molybdenum composite powder for medium and low temperature SCR denitration and a preparation method thereof, the method adopts a process flow of firstly preparing a filter cake of metatitanic acid, controlling the content of titanium dioxide in the filter cake by filtering and dewatering, then dispersing ammonium heptamolybdate in the metatitanic acid by spraying, and finally preparing TiO2-MoO3 composite powder by calcining, although certain energy consumption can be reduced, the ammonium heptamolybdate and the metatitanic acid can not fully react, so that the molybdenum distribution is not uniform and the catalytic activity is not stable, and the embodiment data given by the patent can not reflect the molybdenum distribution condition of the titanium molybdenum composite powder for denitration in the same batch.
Disclosure of Invention
The invention aims to solve the technical problems that the temperature required by the stable operation of the catalyst is reduced, the denitration efficiency is ensured, the sulfate radical content is low, and the accumulation of ammonium sulfate generated after the operation of the catalyst is reduced. Therefore, the method for preparing the raw material for the flue gas denitration catalyst by using the ammonium heptamolybdate is extremely applied.
Aiming at the current industrial situation and customer requirements, I have developed a nano titanium dioxide for flue gas denitration catalyst prepared from ammonium heptamolybdate, the method adopts the co-immersion of ammonium heptamolybdate and metatitanic acid to generate titanium molybdate and ammonium sulfate, part of bonded sulfate radical in metatitanic acid is replaced by molybdate radical, the residual sulfate radical content after calcination is greatly reduced, and the solution co-immersion method is adopted, molybdenum is bonded with titanium dioxide, the molybdenum distribution is more uniform, the catalytic activity is stable, and a plurality of existing defects in the industry can be solved.
The technical scheme of the invention is as follows: flue gas denitration catalyst prepared from ammonium heptamolybdateThe preparation method of the raw materials comprises the following steps: (1) adding a certain amount of ammonium heptamolybdate aqueous solution into metatitanic acid to enable the content of molybdenum trioxide to reach 5.0-10.0wt%, stirring for 1 hour, adding a certain amount of ammonia water, stirring for 1 hour, continuously adjusting the pH of the solution to about 8.5 by using the ammonia water, and then stirring for 2-3 hours to form a suspension; (2) filter pressing and calcining: filtering suspended substance in the suspension by plate and frame filter press to remove water and water-soluble impurities to obtain semi-dry material, calcining at a certain temperature in rotary kiln to control BET to 90-120m2(ii)/g; (3) grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, and the map of the particle size distribution diagram is a single peak or a small peak with the single peak.
In the scheme, the solid content of the semi-dry material in the step (2) is 45-55%.
The purity of molybdenum trioxide in the ammonium heptamolybdate in the step (1) in the scheme is 81-84%.
The raw material for preparing the flue gas denitration catalyst by using the ammonium heptamolybdate is prepared by the scheme.
A raw material for preparing a flue gas denitration catalyst by using ammonium heptamolybdate, wherein the content of molybdenum trioxide is 5-10 wt%. The sulfate radical content is 1.0-1.2 wt%.
A preparation method for preparing a flue gas denitration catalyst by using ammonium heptamolybdate comprises the steps of preparing a raw material for preparing the flue gas denitration catalyst by using the ammonium heptamolybdate and V2O5Pulping and dispersing, adding a binder, physically extruding and forming, drying and shaping, aging and roasting to obtain the low-temperature SCR flue gas denitration catalyst.
The flue gas denitration catalyst prepared by using ammonium heptamolybdate is prepared by using the scheme.
The invention has the advantages that ammonium molybdate and metatitanic acid participate in the reaction and are fully stirred to generate titanium molybdate, the catalytic activity temperature of V can be reduced after M-V-Ti bonding, and a certain amount of V is combined by the raw material2O5The prepared catalyst has low catalytic activity temperature, and has good catalytic effect at the temperature of 150-300 ℃.
Detailed Description
The invention comprises the following steps: (1) suspension preparation: adding a certain amount of ammonium heptamolybdate aqueous solution into metatitanic acid to ensure that the content of molybdenum trioxide reaches 5.0-10.0wt% and the purity of molybdenum trioxide is 81-84%, stirring for 1 hour, adding a certain amount of ammonia water, stirring for 1 hour, continuously adjusting the pH to be about 8.5 with the ammonia water, and stirring for 2-3 hours to form a suspension; (2) filter pressing and calcining: filtering suspended substance in the suspension by plate and frame filter press to remove water and water soluble impurities to obtain semi-dry material with solid content of 45-55%, and calcining at a certain temperature in a rotary kiln to control BET to 90-120m2(ii)/g; (3) grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, the map of the particle size distribution diagram is a single peak or a small peak with the single peak, and the content of the molybdenum trioxide in the finished product is 5-10 wt%. 1.0-1.2wt% of sulfate radical.
The present invention will be further described with reference to the following examples.
Example 1: (1) suspension preparation: adding a certain amount of ammonium heptamolybdate into metatitanic acid to ensure that the content of molybdenum trioxide reaches 6.0wt% and the purity of the molybdenum trioxide is 81%, stirring for 1h, adding a certain amount of ammonia water, stirring for 1h, continuously adjusting the pH value to 8.6 with the ammonia water, and stirring for 2h to form a suspension; (2) and filter pressing and calcining: filtering suspended matters in the suspension by a plate-and-frame filter press to remove water and water-soluble impurities to form a semi-dry material, and feeding the semi-dry material into a rotary kiln for calcination at a certain temperature to ensure that BET is 90-120m2The solid content of the semi-dry material is 45 percent; (3) and grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, and the map of the particle size distribution diagram is a single peak or a small peak with the single peak.
The prepared flue gas denitration catalyst raw material has the molybdenum trioxide content of 6wt% and the sulfate radical content of 1.2 wt%.
A method for preparing a flue gas denitration catalyst by an ammonium heptamolybdate co-leaching method comprises the following steps of mixing the raw materials with V2O5Pulping and dispersing, adding a binder, physically extruding and forming, drying and shaping, aging and roasting to obtain the low-temperature SCR flue gas denitration catalyst.
A flue gas denitration catalyst prepared by ammonium heptamolybdate is prepared by the preparation method.
Example 2: (1) suspension preparation: adding a certain amount of ammonium heptamolybdate into metatitanic acid to ensure that the content of molybdenum trioxide reaches 8.0wt% and the purity of the molybdenum trioxide is 82%, stirring for 1h, adding a certain amount of ammonia water, stirring for 1h, continuously adjusting the pH value to 8.4 with the ammonia water, and stirring for 2.5h to form a suspension; (2) and filter pressing and calcining: filtering suspended matters in the suspension by a plate-and-frame filter press to remove water and water-soluble impurities to form a semi-dry material, and feeding the semi-dry material into a rotary kiln for calcination at a certain temperature to ensure that BET is 90-120m2Per gram, the solid content of the semi-dry material is 50 percent; (3) and grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, and the map of the particle size distribution diagram is a single peak or a small peak with the single peak.
The prepared flue gas denitration catalyst raw material has the molybdenum trioxide content of 8wt% and the sulfate radical content of 1.1 wt%.
A method for preparing a flue gas denitration catalyst by an ammonium heptamolybdate co-leaching method comprises the following steps of mixing the raw materials with V2O5Pulping and dispersing, adding a binder, physically extruding and forming, drying and shaping, aging and roasting to obtain the low-temperature SCR flue gas denitration catalyst.
A flue gas denitration catalyst prepared by ammonium heptamolybdate is prepared by the preparation method.
Example 3: (1) suspension preparation: adding a certain amount of ammonium heptamolybdate into metatitanic acid to ensure that the content of molybdenum trioxide reaches 10.0wt% and the purity of the molybdenum trioxide is 84%, stirring for 1h, adding a certain amount of ammonia water, stirring for 1h, continuously adjusting the pH value to 8.5 with the ammonia water, and stirring for 3h to form a suspension; (2) and filter pressing and calcining: filtering suspended matters in the suspension by a plate-and-frame filter press to remove water and water-soluble impurities to form a semi-dry material, and feeding the semi-dry material into a rotary kiln to be calcined at a certain temperature, wherein the BET is 90-120m2/g, and the solid content of the semi-dry material is 55%; (3) and grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, and the map of the particle size distribution diagram is a single peak or a small peak with the single peak.
The content of molybdenum trioxide in the prepared flue gas denitration catalyst raw material is 10 wt%. The sulfate radical content was 1.0% by weight.
A preparation method of a flue gas denitration catalyst by using ammonium heptamolybdate comprises the following steps of mixing the raw materials with V2O5Pulping and dispersing, adding a binder, physically extruding and forming, drying and shaping, aging and roasting to obtain the low-temperature SCR flue gas denitration catalyst.
A flue gas denitration catalyst prepared by an ammonium heptamolybdate co-leaching method is prepared by the preparation method.
The corresponding finger mapping test was performed on the titanium molybdenum composite powder prepared in examples 1 to 3, and the results are shown in table 1 below:
the catalysts prepared by processing the titanium molybdenum composite powder prepared in examples 1 to 3 were subjected to a corresponding finger mapping test and a sampling analysis comparison of products of various manufacturers currently used in the market, and the results are shown in table 2:
researches show that the calcination time in the invention can not exceed 4h, and the calcination can be carried out if the calcination time exceeds 4h, so that the change of the physical and chemical properties of the finished product can not meet the requirements. The specific calcining temperature is controlled by the BET of the kiln falling products, namely (the specific surface area of the kiln falling products), and the BET of the kiln falling products is inversely proportional to the calcining temperature, namely the calcining temperature is reduced along with the increase of the BET value.
The invention has the beneficial effects that: 1, molybdenum and titanium are bonded after reaction, and the content distribution is uniform, so that the prepared low-temperature catalytic activity is more stable. 2, the content of sulfate radicals in the catalyst is low, the amount of ammonium sulfate generated on the surface of the catalyst is small under the same working condition, and the speed of poisoning of the ammonium sulfate of the catalyst is low.
Claims (7)
1. Denitration catalyst for preparing flue gas by using ammonium heptamolybdateThe preparation method of the raw material for the chemical agent is characterized by comprising the following steps: (1) adding a certain amount of ammonium heptamolybdate aqueous solution into metatitanic acid to enable the content of molybdenum trioxide to reach 5.0-10.0wt%, stirring for 1 hour, adding a certain amount of ammonia water, stirring for 1 hour, continuously adjusting the pH of the solution to about 8.5 by using the ammonia water, and then stirring for 2-3 hours to form a suspension; (2) filter pressing and calcining: filtering suspended substance in the suspension by plate and frame filter press to remove water and water-soluble impurities to obtain semi-dry material, calcining at a certain temperature in rotary kiln to control BET to 90-120m2(ii)/g; (3) grinding detection: and grinding the kiln falling product by a micro powder mill, so that the particle size distribution of the finished product powder is detected by a laser particle sizer D50 to be within the interval of 1.0-1.2 mu m, and the map of the particle size distribution diagram is a single peak or a small peak with the single peak.
2. The method for preparing a raw material for a flue gas denitration catalyst using ammonium heptamolybdate according to claim 1, wherein the solid content of the semi-dry material in the step (2) is 45 to 55%.
3. The method for preparing a raw material for a flue gas denitration catalyst using ammonium heptamolybdate according to claim 1 or 2, wherein the purity of molybdenum trioxide in the ammonium heptamolybdate in the step (1) is 81 to 84%.
4. The raw material for preparing the flue gas denitration catalyst by using ammonium heptamolybdate is characterized by comprising the following steps of: prepared by the preparation method of any one of claims 1 to 3.
5. The method for preparing a raw material for a flue gas denitration catalyst by using ammonium heptamolybdate as claimed in claim 4, which is characterized in that: wherein the content of molybdenum trioxide is 5-10wt%, and the content of sulfate radical is 1.0-1.2 wt%.
6. A method for preparing a flue gas denitration catalyst by using ammonium heptamolybdate is characterized by comprising the following steps: the method for preparing a raw material for a flue gas denitration catalyst from ammonium heptamolybdate according to claim 4 or 5, and V2O5Pulping, dispersing, adding binder, physically extruding, and dryingAnd aging and roasting to prepare the low-temperature SCR flue gas denitration catalyst.
7. The method for preparing the flue gas denitration catalyst by using the ammonium heptamolybdate is characterized by comprising the following steps of: is prepared by the preparation method of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911336885.1A CN111054319A (en) | 2019-12-23 | 2019-12-23 | Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911336885.1A CN111054319A (en) | 2019-12-23 | 2019-12-23 | Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111054319A true CN111054319A (en) | 2020-04-24 |
Family
ID=70301656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911336885.1A Withdrawn CN111054319A (en) | 2019-12-23 | 2019-12-23 | Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111054319A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841526A (en) * | 2020-07-06 | 2020-10-30 | 中国科学院兰州化学物理研究所 | Modified Ce-Ti medium-low temperature flue gas denitration catalyst powder and preparation method thereof |
| CN112221484A (en) * | 2020-11-13 | 2021-01-15 | 重庆新华化工有限公司 | Preparation method of Ti-Mo or Ti-Mo-V catalyst titanium dioxide for reducing energy consumption |
| CN112933954A (en) * | 2021-01-15 | 2021-06-11 | 安徽萃智环保科技有限公司 | Cement kiln semi-dry SCR denitration system and method |
| CN114988467A (en) * | 2022-07-01 | 2022-09-02 | 安徽迪诺环保新材料科技有限公司 | Low-sulfur high-pH titanium dioxide and production method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108212180A (en) * | 2018-03-20 | 2018-06-29 | 攀枝花市正源科技有限责任公司 | A kind of middle low temperature SCR denitration titanium molybdenum composite powder and preparation method thereof |
-
2019
- 2019-12-23 CN CN201911336885.1A patent/CN111054319A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108212180A (en) * | 2018-03-20 | 2018-06-29 | 攀枝花市正源科技有限责任公司 | A kind of middle low temperature SCR denitration titanium molybdenum composite powder and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841526A (en) * | 2020-07-06 | 2020-10-30 | 中国科学院兰州化学物理研究所 | Modified Ce-Ti medium-low temperature flue gas denitration catalyst powder and preparation method thereof |
| CN112221484A (en) * | 2020-11-13 | 2021-01-15 | 重庆新华化工有限公司 | Preparation method of Ti-Mo or Ti-Mo-V catalyst titanium dioxide for reducing energy consumption |
| CN112933954A (en) * | 2021-01-15 | 2021-06-11 | 安徽萃智环保科技有限公司 | Cement kiln semi-dry SCR denitration system and method |
| CN114988467A (en) * | 2022-07-01 | 2022-09-02 | 安徽迪诺环保新材料科技有限公司 | Low-sulfur high-pH titanium dioxide and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111054319A (en) | Raw material for preparing flue gas denitration catalyst by using ammonium heptamolybdate, catalyst and preparation method | |
| CN109513438B (en) | Environment-friendly high-temperature denitration catalyst and preparation method thereof | |
| CN101733101B (en) | Denitrifying catalyst using titanium dioxide nano tubes as carrier and process for preparing same | |
| CN110302795B (en) | Reforming hydrogen production catalyst taking waste vanadium-titanium denitration catalyst as raw material and preparation method thereof | |
| CN108212180B (en) | Titanium-molybdenum composite powder for medium-low temperature SCR denitration and preparation method thereof | |
| CN106345473B (en) | Denitration catalyst material and preparation method and application thereof | |
| CN106140144B (en) | SCR denitration and preparation method thereof | |
| CN111530475B (en) | Rare earth-based medium-low temperature denitration catalyst powder and preparation method thereof | |
| CN105854894A (en) | Modified iron-ore SCR denitration catalyst and preparing method and application thereof | |
| CN104741113A (en) | Low-cost denitration catalyst and preparation method thereof | |
| CN111054398A (en) | Raw material for preparing flue gas denitration catalyst by using molybdenum trioxide, catalyst and preparation method | |
| CN114011400A (en) | Preparation method of acid system waste incineration SCR denitration catalyst and prepared denitration catalyst | |
| CN109745995B (en) | Wide-temperature-window SCR flue gas denitration catalyst and preparation method and application thereof | |
| CN108311134B (en) | Titanium-tungsten-silicon composite powder for SCR denitration of diesel vehicle/ship tail gas and preparation method thereof | |
| CN110694640B (en) | Water-resistant sulfur-resistant denitration catalyst and preparation method thereof | |
| CN112473686A (en) | Preparation method and application of rare earth-based high-temperature SCR denitration catalyst | |
| CN111013567B (en) | Preparation process and application of composite titanium liquid for waste gas catalytic purification | |
| CN113318729A (en) | Preparation method of high-airspeed and poisoning-resistant rare earth-based denitration catalyst powder | |
| CN112169786A (en) | SCR denitration catalyst and preparation method thereof | |
| CN113976102B (en) | Low-temperature rare earth-based denitration catalyst powder and preparation method thereof | |
| CN104624183A (en) | Preparation method of high-mechanical-strength SCR denitration catalyst | |
| CN109647502A (en) | A kind of preparation and application of new type low temperature denitrating catalyst | |
| CN114797838B (en) | Acidic slurry flat denitration catalyst, preparation method thereof and application thereof in cement kiln | |
| CN114247447B (en) | Low-temperature denitration catalyst taking modified carbon material as carrier and preparation method thereof | |
| CN114433123B (en) | Integral honeycomb catalyst for low-temperature SCR denitration and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200424 |