CN110479296B - Catalyst capable of reducing escape of denitrated ammonia and preparation method thereof - Google Patents
Catalyst capable of reducing escape of denitrated ammonia and preparation method thereof Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003054 catalyst Substances 0.000 title claims abstract description 46
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 230000003197 catalytic effect Effects 0.000 claims abstract description 12
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 10
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims abstract description 10
- 239000011246 composite particle Substances 0.000 claims abstract description 9
- 239000011258 core-shell material Substances 0.000 claims abstract description 8
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 7
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 6
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 6
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 238000003980 solgel method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000005470 impregnation Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000000779 smoke Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
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Classifications
-
- 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
- B01J23/70—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
- B01J23/847—Vanadium, niobium or tantalum or polonium
- B01J23/8472—Vanadium
-
- B01J35/398—
-
- B01J35/40—
-
- B01J35/60—
Abstract
A catalyst capable of reducing the escape of denitrified ammonia and a preparation method thereof are disclosed, wherein the catalyst is in a powdery core-shell structure: the shell is porous SiO2A layer having a thickness of 30 to 50nm and a pore diameter of 3 to 4 nm; the 'nucleus' is nano TiO2As a carrier, V2O5、CuSO4And CeO2Composite particles as active component with particle size of about 50um, wherein V2O51 percent of CuSO45-7% of CeO2The mass percentage of the component (A) is 9-10%. The prepared catalyst with the core-shell structure has high (more than 90%) ammonia catalytic oxidation efficiency under the SCR condition, and the preparation process is mature and reliable, and can be used for controlling denitration and ammonia escape of a coal-fired power plant.
Description
Technical Field
The invention belongs to the field of electric power environmental protection, relates to a coal-fired power plant flue gas purification technology, and particularly relates to a catalyst capable of reducing the escape of denitrified ammonia and a preparation method thereof.
Background
Denitration of flue gas of coal-fired power stations is the key point of treatment of air pollutants in recent years. The SCR method is a mainstream technology for flue gas denitration, has the advantages of high denitration efficiency, mature process and the like, is widely applied to coal-fired power stations, and has an important defect: ammonia escapes. The denitration escaping ammonia reacts with sulfur trioxide in the flue gas to generate ammonium bisulfate, the ammonium bisulfate can be enriched on a low-temperature heat exchange surface at the downstream of the SCR reactor and is bonded with fly ash, so that the heat exchange surface is blocked, the heat exchange efficiency is reduced, and the safe operation of a unit and the heat efficiency of a boiler are seriously influenced. Therefore, reducing denitration ammonia slip is a common problem facing coal-fired power plants to be solved urgently. The common methods comprise ammonia injection optimization, denitration temperature control, catalyst replacement at regular intervals and the like, the effects are not obvious, and the development of a novel escape ammonia control technology has important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a catalyst capable of reducing the escape of denitrified ammonia and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a catalyst capable of reducing escape of denitration ammonia comprises the steps of preparing Ce-V/Ti powder through a sol-gel process, preparing Cu-Ce-V/Ti powder with the function of catalytically oxidizing ammonia gas from the Ce-V/Ti powder through an isometric impregnation method, and passing the Cu-Ce-V/Ti powder through a reactor
The process can prepare the catalyst capable of reducing the escape of denitrated ammonia.
The further improvement of the invention is that the specific process for preparing Ce-V/Ti powder by sol-gel process is as follows: carrying out sol-gel reaction on tetrabutyl titanate, cerium nitrate, ammonium metavanadate, water, absolute ethyl alcohol and nitric acid at room temperature until the viscosity of a system is not increased any more, and drying and calcining to obtain Ce-V/Ti powder; wherein the molar ratio of tetrabutyl titanate, cerium nitrate, ammonium metavanadate, water, absolute ethyl alcohol and nitric acid is 1: 0.047-0.052: 0.01: 6: 8: 1.
the invention is further improved in that the drying temperature is 100 ℃ and the drying time is 24 hours.
The invention is further improved in that the calcining temperature is 400 ℃ and the calcining time is 2 hours.
The further improvement of the invention is that the Cu-Ce-V/Ti powder with the function of catalyzing and oxidizing ammonia is prepared by the Ce-V/Ti powder through an isometric impregnation method in the following steps: preparing copper sulfate into an aqueous solution, soaking Ce-V/Ti powder in the aqueous solution in the same volume, drying the powder at 100 ℃ for 2h, drying the powder at 400 ℃ for 2h, and grinding the powder to obtain Cu-Ce-V/Ti powder with the function of catalyzing and oxidizing ammonia gas; wherein the mass ratio of the copper sulfate to the Ce-V/Ti powder is (5.26-7.53): 100.
a further improvement of the invention consists in passing Cu-Ce-V/Ti powder
The process for preparing the catalyst capable of reducing the escape of the denitrified ammonia comprises the following steps: firstly, ultrasonically dispersing Cu-Ce-V/Ti powder in a mixture of absolute ethyl alcohol, deionized water and ammonia water, then dropwise adding ethyl orthosilicate, reacting at room temperature for 5-6 hours after dropwise adding, filtering, and drying to obtain a catalyst Si @ Cu-Ce-V/Ti capable of reducing denitration escape ammonia; wherein the mass ratio of the Cu-Ce-V/Ti powder, absolute ethyl alcohol, deionized water, ammonia water and ethyl orthosilicate is 1: 300: 400: 5: (2.5-5), wherein the mass concentration of the ammonia water is 28%.
The catalyst is a powdery core-shell structure, the core is solid inorganic nano particles with catalytic oxidation effect on ammonia gas, and the shell is a hydrophobic porous inorganic shell.
In a further development of the invention, the core is made of nano-TiO2As a carrier, V2O5、CuSO4And CeO2Composite particles as an active component, the particle diameter of the composite particles is 40-50 un, wherein V2O51 percent of CuSO45-7% of CeO2The mass percentage of the component (A) is 9-10%.
In a further development of the invention, the shell is porous SiO2The thickness of the shell layer is 30-50 nm, and the aperture of the shell is 3-4 nm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the catalyst disclosed by the invention can catalyze oxygen in denitration escaped ammonia under the SCR conditionTo nitrogen and water, thereby reducing ammonia slip. The catalyst is of a core-shell structure, the 'core' mainly plays a role in catalytic oxidation, and the hydrophobic and porous 'shell' can effectively reduce the influence of water vapor on the catalytic effect of the 'core' material on one hand and is acidic (SiO) on the other hand2Acidic oxides) can enrich more ammonia and also contribute to the overall catalytic oxidation efficiency of the catalyst. Therefore, the catalyst has higher catalytic oxidation efficiency (more than 90%) to ammonia gas, and is slightly influenced by the fluctuation of flue gas conditions (smoke temperature and components) (unit load fluctuation). Compared with the traditional ammonia escape control method, the ammonia escape control method using the catalyst provided by the invention has the advantages of simplicity in operation (directly arranged at the tail end of the SCR reactor), good effect, no influence on denitration efficiency and the like.
(2) The preparation method of the catalyst disclosed by the invention comprises a sol-gel process (Ce-V/Ti powder preparation), an equal-volume impregnation process (Cu-Ce-V/Ti powder preparation) and
the process (porous shell preparation) is mature and reliable, is suitable for large-scale production, and is beneficial to engineering popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of a catalyst for reducing ammonia slip in denitration according to the present disclosure. Wherein 1 is a core and 2 is a shell.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The structure of the catalyst capable of reducing denitration escaping ammonia is shown in figure 1, wherein a core 1 is arranged in a shell 2, the core 1 is Cu-Ce-V/Ti powder, and the shell 2 is porous SiO2And (3) a layer.
The chemical composition of the catalyst is related to the preparation process, and the preparation process of the catalyst comprises the following steps:
(1) preparation of inorganic nano particles with function of catalytic oxidation of ammonia gas
Firstly, tetrabutyl titanate (1mol), cerium nitrate (0.047-0.052 mol), ammonium metavanadate (0.01mol) and water (6mol) are used as raw materials, absolute ethyl alcohol is used as a solvent (8mol), nitric acid (1mol, the mass concentration is 65-68%) is used as a hydrolysis inhibitor, and a sol-gel reaction is carried out at room temperature until the viscosity of a system is not increased any more. The obtained gel is dried for 24 hours at the temperature of about 100 ℃ and then calcined for 2 hours at the temperature of 400 ℃ to obtain Ce-V/Ti powder. Then, preparing copper sulfate (5.26-7.53 g) into an aqueous solution, soaking Ce-V/Ti powder (100g) in the aqueous solution in an equal volume, drying the powder at about 100 ℃ for 2h, drying the powder at 400 ℃ for 2h, and grinding the dried powder to obtain the inorganic nano particle Cu-Ce-V/Ti powder with the function of catalyzing and oxidizing ammonia gas.
The invention is dried for 2h at about 100 ℃ and then dried for 2h at 400 ℃ because: the direct calcination water loss is too fast and the copper sulfate can be brought to the surface of the catalyst to form surface enrichment, so-called "salting out".
(2) And (4) preparing a porous shell layer.
By using
The preparation method comprises the steps of ultrasonically dispersing 1 part of Cu-Ce-V/Ti powder into a three-neck flask with 300g of absolute ethyl alcohol, 400g of deionized water and 5g of concentrated ammonia water (the mass concentration is 28%), dropwise adding 2.5-5 g of tetraethoxysilane into the three-neck flask under vigorous stirring, reacting at room temperature for 5-6 hours, filtering and separating after the reaction is finished, placing the product at 50 ℃, and drying in a 0.01MP a drying oven for 12 hours to obtain the catalyst Si @ Cu-Ce-V/Ti capable of reducing denitration escape ammonia.
The catalyst prepared by the invention is a powdery core-shell structure catalyst, the core is solid inorganic nano particles with catalytic oxidation effect on ammonia gas, and the shell is a hydrophobic porous inorganic shell.
The core is nano TiO2As a carrier, V2O5、CuSO4And CeO2Composite particles as an active component, the particle diameter of the composite particles is 40-50 un, wherein V2O51 percent of CuSO45-7% of CeO2The mass percentage of the component (A) is 9-10%.
The shell is porous SiO2The thickness of the shell layer is 30-50 nm, and the aperture of the shell is 3-4 nm.
And placing the obtained Si @ Cu-Ce-V/Ti catalyst in a self-made SCR reactor for ammonia catalytic oxidation efficiency evaluation. The simulated smoke conditions are as follows: the smoke temperature is 300-400 ℃, and the initial concentration of NO is 50mg/m3，SO2The initial concentration is 2860mg/m3，NH3The initial concentration was 50mg/m3，2～8mg/m3，O2Concentration of 6 (v/v)%, H2The O concentration was 10 (v/v)%. The ammonia gas reduction rate is calculated by testing the ammonia concentration in the flue gas at the inlet and the outlet of the reactor, so that the catalytic oxidation efficiency of the catalyst on ammonia is represented.
Example 1
Firstly, tetrabutyl titanate (1mol), cerium nitrate (0.047mol), ammonium metavanadate (0.01mol) and water (6mol) are used as raw materials, absolute ethyl alcohol is used as a solvent (8mol), nitric acid (1mol) is used as a hydrolysis inhibitor, and sol-gel reaction is carried out at room temperature until the viscosity of a system is not increased any more. The obtained gel is dried for 24 hours at the temperature of about 100 ℃ and then calcined for 2 hours at the temperature of 400 ℃ to obtain Ce-V/Ti powder.
Then, copper sulfate (6.4g) is prepared into aqueous solution, Ce-V/Ti powder (100g) is soaked in the aqueous solution in the same volume, and then the obtained product is dried for 2 hours at the temperature of about 100 ℃, and then is dried for 2 hours at the temperature of 400 ℃ and then is ground, and finally the inorganic nano particle Cu-Ce-V/Ti powder with the function of catalyzing and oxidizing ammonia gas is obtained.
(2) And (4) preparing a porous shell layer.
By using
The preparation process comprises the steps of dispersing Cu-Ce-V/Ti powder (1g) in a three-neck flask with absolute ethyl alcohol (300g), deionized water (400g) and concentrated ammonia water (the mass concentration is 28% and 5g) in an ultrasonic mode, dropwise adding ethyl orthosilicate (3g) into the three-neck flask under vigorous stirring, reacting at room temperature for 6 hours, finishing the reaction, filtering and separating, placing the product at 50 ℃, and drying in a-0.01 MP a drying oven for 12 hours to obtain the catalyst Si @ Cu-Ce-V/Ti capable of reducing denitration escape ammonia.
Examples 2-7 the other conditions were the same as in example 1 except as detailed in Table 1.
TABLE 1 results of examples 1-7
As can be seen from Table 1, the denitration efficiency of the catalyst prepared by the method is over 90 percent and can reach as high as 98 percent.
The catalyst prepared by the invention is of a powdery core-shell structure: the shell is porous SiO2A layer having a thickness of 30 to 50nm and a pore diameter of 3 to 4 nm; the 'nucleus' is nano TiO2As a carrier, V2O5、CuSO4And CeO2Composite particles as active components, the particle diameter of the composite particles is 40-50 um, wherein V2O51 percent of CuSO45-7% of CeO2The mass percentage of the component (A) is 9-10%. The preparation process of the catalyst comprises the following steps: the sol-gel method is combined with the isometric immersion method to prepare the 'nuclear' substance
The method produces a "shell" layer. The prepared catalyst with the core-shell structure has high (more than 90%) ammonia catalytic oxidation efficiency under the SCR condition, and the preparation process is mature and reliable, and can be used for controlling denitration and ammonia escape of a coal-fired power plant.
Claims (8)
1. A preparation method of a catalyst capable of reducing escape of denitration ammonia is characterized by preparing Ce-V/Ti powder by a sol-gel process, preparing Cu-Ce-V/Ti powder with the function of catalytically oxidizing ammonia gas by the Ce-V/Ti powder through an isometric impregnation method, and passing the Cu-Ce-V/Ti powder through a reactor
The process prepares the catalyst capable of reducing the escape of the denitrated ammonia;
passing Cu-Ce-V/Ti powder through
Process for preparing denitration ammonia capable of reducing denitration ammonia escapeThe procedure of the catalyst of (1) is as follows: firstly, ultrasonically dispersing Cu-Ce-V/Ti powder in a mixture of absolute ethyl alcohol, deionized water and ammonia water, then dropwise adding ethyl orthosilicate, reacting at room temperature for 5-6 hours after dropwise adding, filtering, and drying to obtain a catalyst Si @ Cu-Ce-V/Ti capable of reducing denitration escape ammonia; wherein the mass ratio of the Cu-Ce-V/Ti powder, absolute ethyl alcohol, deionized water, ammonia water and ethyl orthosilicate is 1: 300: 400: 5: (2.5-5), wherein the mass concentration of the ammonia water is 28%.
2. The preparation method of the catalyst capable of reducing denitration ammonia escape, according to claim 1, is characterized in that the specific process for preparing Ce-V/Ti powder by a sol-gel process is as follows: carrying out sol-gel reaction on tetrabutyl titanate, cerium nitrate, ammonium metavanadate, water, absolute ethyl alcohol and nitric acid at room temperature until the viscosity of a system is not increased any more, and drying and calcining to obtain Ce-V/Ti powder; wherein the molar ratio of tetrabutyl titanate, cerium nitrate, ammonium metavanadate, water, absolute ethyl alcohol and nitric acid is 1: 0.047-0.052: 0.01: 6: 8: 1.
3. the method for preparing the catalyst capable of reducing the escape of denitrated ammonia according to claim 2, wherein the drying temperature is 100 ℃ and the drying time is 24 hours.
4. The method for preparing the catalyst capable of reducing the escape of the denitrated ammonia according to claim 2, wherein the calcining temperature is 400 ℃ and the calcining time is 2 hours.
5. The preparation method of the catalyst capable of reducing denitration ammonia escape, according to claim 1, is characterized in that the Cu-Ce-V/Ti powder with the function of catalytically oxidizing ammonia gas is prepared by an isometric impregnation method from Ce-V/Ti powder as follows: preparing copper sulfate into an aqueous solution, soaking Ce-V/Ti powder in the aqueous solution in the same volume, drying the powder at 100 ℃ for 2h, drying the powder at 400 ℃ for 2h, and grinding the powder to obtain Cu-Ce-V/Ti powder with the function of catalyzing and oxidizing ammonia gas; wherein the mass ratio of the copper sulfate to the Ce-V/Ti powder is (5.26-7.53): 100.
6. the catalyst prepared by the method of any one of claims 1 to 5, wherein the catalyst has a powdery core-shell structure, the core is solid inorganic nano-particles having catalytic oxidation effect on ammonia gas, and the shell is a hydrophobic porous inorganic shell.
7. The catalyst of claim 6, wherein the core is a nano TiO2As a carrier, V2O5、CuSO4And CeO2Composite particles as an active component, the particle diameter of the composite particles is 40-50 un, wherein V2O51 percent of CuSO45-7% of CeO2The mass percentage of the component (A) is 9-10%.
8. The catalyst of claim 6 wherein the shell is porous SiO2The thickness of the shell layer is 30-50 nm, and the aperture of the shell is 3-4 nm.
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| CN108212146A (en) * | 2018-01-09 | 2018-06-29 | 上海大学 | Nucleocapsid denitrating catalyst of metallic monoliths and preparation method thereof |
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| US20090011937A1 (en) * | 2006-02-03 | 2009-01-08 | Vantieghem Herve R | Use of Fungicides for Increasing the Quality and Optionally the Quantity of Oil-Plant Products |
| CN108212146A (en) * | 2018-01-09 | 2018-06-29 | 上海大学 | Nucleocapsid denitrating catalyst of metallic monoliths and preparation method thereof |
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