CN102327783B - Method for preparing denitration catalyst carrier TiO2-WO3 composite powder - Google Patents
Method for preparing denitration catalyst carrier TiO2-WO3 composite powder Download PDFInfo
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- CN102327783B CN102327783B CN 201110201646 CN201110201646A CN102327783B CN 102327783 B CN102327783 B CN 102327783B CN 201110201646 CN201110201646 CN 201110201646 CN 201110201646 A CN201110201646 A CN 201110201646A CN 102327783 B CN102327783 B CN 102327783B
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Abstract
The invention discloses a method for preparing denitration catalyst carrier TiO2-WO3 composite powder, which comprises the following steps of: pulping and dispersing a metatitanic acid raw material; adjusting until the concentration of the slurry, calculated in terms of the titanium dioxide TiO2, is 15-25% by mass; adding ammonium paratungstate to the slurry according to a proportion, wherein calculated by the mass of tungsten trioxide WO3, the additive proportion of the ammonium paratungstate is 4.0%-10.0% of the sum of the TiO2 and the WO3; adding ammonia water to the slurry to adjust the pH to 6.5-9.0; filtering and dewatering to obtain a blocky filter cake; crushing the filter cake mechanically; drying and roasting the crushed filter cake at 200 DEG C to 580 DEG C for 6 hours; and crushing the roasted material falling in the kiln to obtain a TiO2-WO3 composite powder product serving as the denitration catalyst carrier. The method disclosed by the invention is low in manufacturing cost and simple in process; and the prepared product has the advantages of high specific surface area, high surface chemical activity, high catalytic efficiency and good processability.
Description
Technical field
The present invention relates to the chemical products preparing technical field, concrete, relate to a kind of denitration catalyst carrier TiO for preparing
2-WO
3the method of composite powder.
Background technology
The high-temp combustion emission gases---contain a large amount of NOx(nitrogen oxide in flue gas), nitrogen oxide is one of main atmosphere pollution.Take nitric oxide and nitrogen dioxide is that main nitrogen oxide is a major reason that forms photochemical fog and acid rain, simultaneously nitrogen oxide is also a kind of important greenhouse gases, and under equal number, its impact that causes greenhouse effects is that tens times of carbon dioxide are to hundred times.Therefore, the denitration of flue gas improvement is the extremely important of environmental protection and very urgent task.SCR (SCR) gas denitrifying technology is the effective technology of the solution Pollution Index in Air Nitric Oxides that generally adopts in the world at present.Under the effect of catalyst, by reducing agents such as ammonia, urea, nitrous oxides selectivity harmful in flue gas is catalysed and reduced into to clean harmless nitrogen G&W, realize qualified discharge, its denitration efficiency (removal of nitrogen oxide rate) can reach more than 90%, and denitrating catalyst is key and the core of implementing this technology.
Denitrating catalyst mainly adopts nano titanium oxide etc. as active carrier, take vanadic anhydride as major catalyst using tungstic acid and titanium dioxide as co-catalyst as the catalytic activity composition, by ammonia, reduction of nitrogen oxide is become to the nitrogen G&W.Titanium dioxide-tungstic acid composite powder material is because titanium dioxide and tungstic acid is compound, structure and the surface nature of carrier have been changed, also make tungstic acid distribute in carrier more even, improved the processing characteristics of carrier, processes such as being beneficial to batch mixing in catalyst preparation, extruding, be dry, guaranteed the higher yield rate of catalyst preparation, so the preparation of carrier is the emphasis of denitrating catalyst technology.
Publication number is CN1724149, the Chinese patent literature that open day is on January 25th, 2006 discloses the preparation method of the low temperature multicomponent catalyst in a kind of denitrating flue gas, employing titanium dioxide is carrier, the oxide of manganese of take is active component, adds variable valency metal iron, copper, vanadium etc. to make a kind of low-temperature denitration catalyst product.The main active component of take catalyst of this invention is technological core, does not relate to the technology of preparing of catalyst carrier titanium dioxide product.Publication number is CN1451475, the Chinese patent literature that open day is on October 29th, 2003 discloses a kind of preparation of making carried catalyst with titanium dioxide, and this invention is addressed catalyst titanium dioxide and is characterised in that: the crystallite particle diameter of 1) Detitanium-ore-type crystallization (101) face is 8～22nm scope; 2) sulfate radical that contains 0.3～5.0wt%.Described proterties depends primarily on chemical constituent and the calcining heat condition of raw materials, does not relate to the technology of preparing that improves titanium dioxide application performance on catalyst.
ZL200810045530.2 discloses the preparation method of several denitrating catalysts.The method is to take metatitanic acid as raw material, and slurry is added to some additives, after carrying out a series of processing, 300 ℃ ~ 530 ℃ calcinings 5 hours, after pulverizing, obtains the titania powder product.The method technique is more complicated, adds additive component more, and cost is also relatively high.
Japan Patent JP59035026, JP54082392, JP55008846, JP02241543 disclose the technology of preparing of several denitrating catalysts, and the preparation method of titanium dioxide raw material, specific as follows: as to get a certain amount of metatitanic acid, 110 ℃ of dryings after 20 hours, dry material is calcined 5 hours under 509 ℃, after pulverizing, obtained the titania powder product.The method is not carried out modification to metatitanic acid, by the control to the metatitanic acid calcining heat, control the titanium dioxide product of certain grain size, can not obtain high performance titanium dioxide product, and the method does not relate to the preparation of titanium dioxide and tungstic acid composite granule.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method for preparing denitration catalyst carrier TiO2-WO3 composite powder, the inventive method low cost of manufacture, technique are simple, the product prepared has that specific area is high, chemical mobility of the surface is high, the advantage of the high and good processability of catalytic efficiency.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of method for preparing denitration catalyst carrier TiO2-WO3 composite powder comprises the steps:
1) the raw material metatitanic acid disperses through making beating, is adjusted to titanium dioxide TiO
2the concentration of slurry that the mass fraction of meter is 15 ~ 25%;
2) add ammonium paratungstate to the ratio in 4.0% ~ 10.0% in slurries, described ratio is calculated with respect to titanium dioxide and tungstic acid sum with tungstic acid; Be the quality/(quality of the quality+tungstic acid of titanium dioxide)=4.0% ~ 10.0% of tungstic acid, for example tungstic acid can be 4:96 with the ratio of titanium dioxide, 5:95,10:90 etc.;
3) to through step 2) add ammoniacal liquor, adjustment pH value to 6.5 ~ 9.0 in resulting slurries after processing; Can improve the calcining performance with the compound and metatitanic acid of tungstic acid, obtain appropriate acid position characteristic; Be that the pH value is controlled at 6.5 ~ 9.0 and can guarantees that finished product keeps a certain amount of hydroxyl, thereby there is appropriate L acid and B acid;
The slurries filtering means dehydration that 4) will obtain after step 3) is processed, obtain block filter cake, and making block filter cake titanium dioxide mass fraction is 40%～55%;
5) by resulting block filter cake Mechanical Crushing after the step 4) filtering means dehydration, the filter cake after fragmentation was 200 ℃～350 ℃ dryings 2.5 hours, and the filter cake after oven dry was 350 ℃～580 ℃ calcinings 3.5 hours.
6) calcining falls the kiln material after crushed, makes denitration catalyst carrier TiO
2-WO
3composite powder.
The further technical scheme of the present invention is: described raw material metatitanic acid is the hydrated titanium dioxide that contains 5%～9% sulfuric acid.
The further technical scheme of the present invention is: described raw material metatitanic acid is to be obtained after concentrated, hydrolysis, washing and bleaching by intermediate product titanyl sulfate in sulfate process titanium dioxide production.
The further technical scheme of the present invention is: WO in the ammonium paratungstate described step 2)
3content is 88% ~ 91%.
The further technical scheme of the present invention is: described step 2), ammonium paratungstate joins in slurries with the form of pressed powder.
The further technical scheme of the present invention is: it is to adopt resistivity to be greater than 1.0 * 10 that described step 1) Raw metatitanic acid making beating disperses
6the deionized water of Ω .cm or pure water.
The further technical scheme of the present invention is: prepared by following method by the ammoniacal liquor in described step 3): liquefied ammonia for ammonia, passes into by ammonia the concentrated ammonia liquor that the concentration for preparing in pure water is 23%～30% through decompression.
The further technical scheme of the present invention is: the ammoniacal liquor in described step 3) is to reach the commercial ammoniacal liquor of analyzing pure standard.
The further technical scheme of the present invention is: the filter cake described in described step 5), 350 ℃～580 ℃ calcinings 3.5 hours, specifically refers to: 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours.
The present invention further technical scheme is: the kiln material that falls of the calcining described in described step 6) adopts shearing crusher to pulverize.
In sum, the present invention compared with prior art, has following advantage:
1, because the present invention has advantages of low cost of manufacture, technique is simple, the product specific area is high, chemical mobility of the surface is high, adopt the present invention can not bring impurity into to final products; Simultaneously, the present invention compares with the Chinese patent literature that existing publication number is CN1724149 and CN1451475, is different from above-mentioned two pieces of technical schemes fully and has adopted new preparation method, makes the present invention have higher novelty; Compared to ZL200810045530.2, process route is simplified more, and cost is also cheaper, and properties of product are more efficient, steady quality; In addition, the present invention compares with existing Japan Patent JP59035026, JP54082392, JP55008846, JP02241543: technique of the present invention is by having carried out modification to metatitanic acid, add ammonium paratungstate with suitable method subsequently, coordinate suitable calcination condition, guarantee between Ti-O-W to form the bridge-type complex, the titanium dioxide product performance that obtains better, the product specific area is high, chemical mobility of the surface is high, good processability.
2, the raw material metatitanic acid that the present invention adopts is intermediate product during sulfate process titanium dioxide is produced, not only cheap, and conveniently is easy to get, and production cost is further reduced; Adopt the deionized water beating results good; The time segment different temperatures calcining manners of filter cake be conducive to further form there is high-specific surface area, particle diameter is little, epigranular, good dispersion are beneficial to processing titanium dioxide product.
3, the present invention is directed in metatitanic acid and contain a large amount of sulfuric acid, " bridge formation " effect due to sulfuric acid, make the viscosity of metatitanic acid large, easily harden in the processing of low temperature drying and calcining, reduced physics, the chemical index such as the specific area of titanium dioxide product after calcining and chemical mobility of the surface.Therefore, the present invention is by adding ammoniacal liquor and pure water/deionized water, as additive, metatitanic acid is carried out to modification, by processing the viscosity that can greatly reduce metatitanic acid, improve the calcining performance of metatitanic acid, can obtain loose, many micropores, the calcined product of appropriate L acid and B acid position is arranged, the specific area of final products is high, and chemism is high, good processability; After measured, the acid position of final products is equivalent to contain 1.0%～4.0%(in mass fraction) sulfate radical SO
4 2-.The technique that metatitanic acid is processed in this invention is simple, cost is lower: ammonium paratungstate has in the metatitanic acid slurry of higher concentration after joining improvement with pressed powder, due to the interaction between Ti-O-W, only need stir a little and can make whole slurry even; The ammonium paratungstate added is transformed into Sulfated TiO after calcining
2-WO
3composite, not only make the catalytic efficiency of final products improve a lot, but also can recycle from spent catalyst.
4, select cut mode to pulverize the kiln material, can make that the final products granularity is thinner, particle size distribution is narrower, and the number cells of product is more, porosity is high, the good processability of product.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
embodiment 1
Prepare ammoniacal liquor: liquefied ammonia, passes into ammonia in pure water and prepares concentrated ammonia liquor for ammonia through decompression, standby.
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of deionized water, adjust concentration of slurry 15～25wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 5wt%; In slurry, add ammoniacal liquor to adjust pH value to 8.5; After abundant stirring, filter, filtering the gained filtrate is block metatitanic acid; By the filter cake that obtains after block metatitanic acid Mechanical Crushing 200 ℃～350 ℃ dryings 2.5 hours, filter cake after oven dry was 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours, the calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, what described raw material metatitanic acid referred to that intermediate product titanyl sulfate in sulfate process titanium dioxide production obtains after concentrated, hydrolysis, washing and bleaching contains 5%～9%(in mass fraction) water and the titanium dioxide of sulfuric acid.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
The technique that the present invention processes metatitanic acid is simple, cost is lower.The final products that the present embodiment acquires are as the TiO of catalyst carrier
2-WO
3the specific area of composite powder is high, and chemism is high, good processability; And catalytic efficiency also improves a lot.
embodiment 2
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of pure water, adjust concentration of slurry 15～20wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 4wt%; In slurry, add analytically pure commercial ammoniacal liquor to adjust pH value to 6.5～7.5; After abundant stirring, filter, filtering the gained filter cake is block metatitanic acid; By the filter cake that obtains after block metatitanic acid Mechanical Crushing, 200 ℃～350 ℃ dryings after 2.5 hours, the filter cake after oven dry was 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours; The calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, described raw material metatitanic acid refers to the water that contains 5%～9% sulfuric acid and the titanium dioxide that in sulfate process titanium dioxide production, the intermediate product titanyl sulfate obtains after concentrated, hydrolysis, washing and bleaching.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
embodiment 3
Prepare ammoniacal liquor: liquefied ammonia, passes into ammonia in pure water and prepares concentrated ammonia liquor for ammonia through decompression, standby.
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of deionized water, adjust concentration of slurry 20～25wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 5.0wt%; In slurry, add ammoniacal liquor to adjust pH value to 8.0～9.0; After abundant stirring, filter, filtering the gained filtrate is block metatitanic acid; By the filter cake that obtains after block metatitanic acid Mechanical Crushing, 200 ℃～350 ℃ dryings 2.5 hours, dried filter cake was calcined in calciner, comprises 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours; The calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, described raw material metatitanic acid refers to the water that contains 5%～9% sulfuric acid and the titanium dioxide that in sulfate process titanium dioxide production, the intermediate product titanyl sulfate obtains after concentrated, hydrolysis, washing and bleaching.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
embodiment 4
Prepare ammoniacal liquor: liquefied ammonia, passes into ammonia in pure water and prepares concentrated ammonia liquor for ammonia through decompression, standby.
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of deionized water, adjust concentration of slurry 18～20wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 7.0wt%; In slurry, add ammoniacal liquor to adjust pH value to 7.5～8.5; After abundant stirring, filter, filtering the gained filtrate is block metatitanic acid; By the filter cake that obtains after block metatitanic acid mechanical crushing 200 ℃～350 ℃ dryings 2.5 hours, the calcining 3.5 hours in calciner again of the filter cake after oven dry; Described calcining specifically comprises 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours in 3.5 hours, and the calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, described raw material metatitanic acid refers to the water that contains 5%～9% sulfuric acid and the titanium dioxide that in sulfate process titanium dioxide production, the intermediate product titanyl sulfate obtains after concentrated, hydrolysis, washing and bleaching.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
embodiment 5
Prepare ammoniacal liquor: liquefied ammonia, passes into ammonia in pure water and prepares concentrated ammonia liquor for ammonia through decompression, standby.
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of deionized water, adjust concentration of slurry 20～22wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 9.0wt%; In slurry, add ammoniacal liquor to adjust pH value to 8.5; After abundant stirring, filter, filtering the gained filtrate is block metatitanic acid; By the filter cake that obtains after block metatitanic acid mechanical crushing 200 ℃～350 ℃ dryings 2.5 hours; Filter cake after oven dry is calcined 3.5 hours in calciner, wherein calcines and within 3.5 hours, specifically refers to 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours; The calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, described raw material metatitanic acid refers to the water that contains 5%～9% sulfuric acid and the titanium dioxide that in sulfate process titanium dioxide production, the intermediate product titanyl sulfate obtains after concentrated, hydrolysis, washing and bleaching.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
embodiment 6
Prepare ammoniacal liquor: liquefied ammonia, passes into ammonia in pure water and prepares ammoniacal liquor for ammonia through decompression, standby.
Take the 10Kg metatitanic acid and (press TiO
2meter), join in the reactor with agitating device, add a certain amount of deionized water, adjust concentration of slurry 20wt%; After stirring, in slurry, add ammonium paratungstate (APT), tungstic acid with respect to titanium dioxide and tungstic acid weight and ratio be 10.0wt%; In slurry, add ammoniacal liquor to adjust pH value to 8.0; After abundant stirring, filter, filtering the gained filtrate is block metatitanic acid; By the filter cake that obtains after block metatitanic acid mechanical crushing 200 ℃～350 ℃ dryings 2.5 hours, by the filter cake after drying 0.8 hour, 400 ℃～580 ℃ calcinings of 350 ℃～400 ℃ calcinings 2.7 hours.The calcining that calcining the is obtained kiln material that falls is pulverized with shearing crusher, is prepared into pulverous titanium dioxide-tungstic acid composite granule product.
The present embodiment, described raw material metatitanic acid refers to the water that contains 5%～9% sulfuric acid and the titanium dioxide that in sulfate process titanium dioxide production, the intermediate product titanyl sulfate obtains after concentrated, hydrolysis, washing and bleaching.Form with pressed powder during ammonium paratungstate joins in slurries, and WO in the ammonium paratungstate added
3content is 88% ~ 91%.
The proterties result of above-described embodiment gained catalyst carrier is reflected in following table:
| ? | WO 3/ TiO 2Weight ratio | Particle diameter/nm | Grinding particle size D50(μ m) | Product purity % | Specific area m 2/g | Denitration efficiency % | Pore volume mL/g | 10% suspension pH value | Extrusion molding rate % | Scasoning check rate % |
| Embodiment 1 | 5:95 | 16.8 | 1.08 | 91.7 | 91.2 | 88.9 | 1.25 | 2.1 | 93.2 | 8.2 |
| Embodiment 2 | 4:96 | 17.5 | 1.07 | 92.5 | 85.4 | 85.3 | 1.18 | 2.3 | 91.0 | 8.6 |
| Embodiment 3 | 5:95 | 17.0 | 1.09 | 91.8 | 88.3 | 90.3 | 1.27 | 2.0 | 95.5 | 7.0 |
| Embodiment 4 | 7:93 | 16.5 | 1.11 | 89.5 | 93.0 | 92.5 | 1.15 | 1.9 | 90.0 | 9.7 |
| Embodiment 5 | 9:91 | 16.2 | 1.13 | 87.8 | 97.9 | 93.8 | 1.13 | 1.8 | 87.6 | 12.3 |
| Embodiment 6 | 10:90 | 15.8 | 1.15 | 86.9 | 100.5 | 95.6 | 1.09 | 1.7 | 85.7 | 14.1 |
In upper table, " denitration efficiency " refers to the denitration efficiency of the denitrating catalyst that the catalyst carrier processing that utilizes the present invention to prepare prepares.
As mentioned above, just can realize preferably the present invention.
Claims (8)
1. one kind prepares denitration catalyst carrier TiO
2-WO
3the method of composite powder, is characterized in that, comprises the steps:
1) the raw material metatitanic acid disperses through making beating, is adjusted to titanium dioxide TiO
2the concentration of slurry that the mass fraction of meter is 15 ~ 25%;
2) add ammonium paratungstate to the ratio in 4.0% ~ 10.0% in slurries, described ratio is calculated with respect to titanium dioxide and tungstic acid sum with the quality of tungstic acid
;
3) to through step 2) add ammoniacal liquor, adjustment pH value to 6.5 ~ 9.0 in resulting slurries after processing;
The slurries filtering means dehydration that 4) will obtain after step 3) is processed, obtain block filter cake, and making block filter cake titanium dioxide mass fraction is 40%～55%;
5) by resulting block filter cake Mechanical Crushing after the step 4) filtering means dehydration, the filter cake after fragmentation was 200 ℃～350 ℃ dryings 2.5 hours, and the filter cake after oven dry was 350 ℃～580 ℃ calcinings 3.5 hours;
6) calcining falls the kiln material after crushed, makes denitration catalyst carrier TiO
2-WO
3composite powder;
Described raw material metatitanic acid is the hydrated titanium dioxide that contains 5%～9% sulfuric acid.
2. a kind of denitration catalyst carrier TiO for preparing according to claim 1
2-WO
3the method of composite powder, is characterized in that, described raw material metatitanic acid is to be obtained after concentrated, hydrolysis, washing and bleaching by intermediate product titanyl sulfate in sulfate process titanium dioxide production.
3. a kind of denitration catalyst carrier TiO for preparing according to claim 2
2-WO
3the method of composite powder, is characterized in that, described step 2) in ammonium paratungstate in WO
3content is 88% ~ 91%.
4. a kind of denitration catalyst carrier TiO for preparing according to claim 3
2-WO
3the method of composite powder, is characterized in that, described step 2) in, ammonium paratungstate joins in slurries with the form of pressed powder.
5. according to the described a kind of denitration catalyst carrier TiO for preparing of claim 1-4 any one
2-WO
3the method of composite powder, is characterized in that, it is to adopt resistivity to be greater than 1.0 * 10 that described step 1) Raw metatitanic acid making beating disperses
6the deionized water of Ω .cm or pure water.
6. a kind of denitration catalyst carrier TiO for preparing according to claim 5
2-WO
3the method of composite powder, is characterized in that, by following method, prepared by the ammoniacal liquor in described step 3): liquefied ammonia for ammonia, passes into by ammonia the concentrated ammonia liquor that the concentration for preparing in pure water is 23%～30% through decompression.
7. a kind of denitration catalyst carrier TiO for preparing according to claim 5
2-WO
3the method of composite powder, is characterized in that, the ammoniacal liquor in described step 3) is to reach the commercial ammoniacal liquor of analyzing pure standard.
8. a kind of denitration catalyst carrier TiO for preparing according to claim 1
2-WO
3the method of composite powder, is characterized in that, the kiln material that falls of the calcining described in described step 6) adopts shearing crusher to pulverize.
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| CN102921472A (en) * | 2012-09-11 | 2013-02-13 | 河南佰利联化学股份有限公司 | Preparation method for titanium-tungsten composite powder as denitrification catalyst carrier |
| CN102896002B (en) * | 2012-10-10 | 2014-10-29 | 浙江海亮环境材料有限公司 | Method for preparing titanium dioxide-tungsten trioxide (TiO2-WO3) composite powder |
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| CN103349991B (en) * | 2013-07-30 | 2015-04-08 | 重庆新华化工有限公司 | Carrier for denitration catalyst |
| CN104117351B (en) * | 2013-11-20 | 2016-04-27 | 广西美之峰科技有限责任公司 | The preparation method of denitration ceramic catalyst carrier |
| CN104437469B (en) * | 2014-11-18 | 2016-08-17 | 郭燏 | A kind of nano-titanium dioxide powder for flue gas deodorize/denitrating catalyst and its preparation method and application |
| CN107356634A (en) * | 2017-05-22 | 2017-11-17 | 江苏时瑞电子科技有限公司 | A kind of preparation method of tungsten oxide nitrogen-containing oxide gas sensitive |
| CN113735164A (en) * | 2021-08-18 | 2021-12-03 | 安徽迪诺环保新材料科技有限公司 | Nano titanium dioxide for high-sulfur and high-plasticity denitration and preparation method thereof |
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