CN115814783A - Anti-potassium poisoning SCR denitration catalyst and preparation method thereof - Google Patents
Anti-potassium poisoning SCR denitration catalyst and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
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- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 6
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- 238000001354 calcination Methods 0.000 claims description 19
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- 238000001035 drying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
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- 238000000227 grinding Methods 0.000 claims description 9
- 150000002821 niobium Chemical class 0.000 claims description 7
- YHBDIEWMOMLKOO-UHFFFAOYSA-I pentachloroniobium Chemical compound Cl[Nb](Cl)(Cl)(Cl)Cl YHBDIEWMOMLKOO-UHFFFAOYSA-I 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- DSYRJFDOOSKABR-UHFFFAOYSA-I niobium(v) bromide Chemical compound [Br-].[Br-].[Br-].[Br-].[Br-].[Nb+5] DSYRJFDOOSKABR-UHFFFAOYSA-I 0.000 claims description 4
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Abstract
The invention provides an anti-potassium poisoning SCR denitration catalyst, which comprises a vanadium-based catalyst and Nb doped in the vanadium-based catalyst 2 O 5 (ii) a The vanadium-based catalyst comprises V 2 O 5 、WO 3 And TiO 2 (ii) a The Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1. the invention provides an SCR denitration catalyst with potassium poisoning resistance and a preparation method thereofAnd the high-potassium flue gas has obvious advantages under the high-potassium flue gas conditions of a high-sulfur coal burning power plant, a biomass power plant and the like.
Description
Technical Field
The invention relates to the technical field of preparation of SCR denitration catalysts, relates to a potassium poisoning resistant SCR denitration catalyst and a preparation method thereof, and particularly relates to a formula and a preparation method of the SCR denitration catalyst with potassium poisoning resistance.
Background
Nitrogen oxides (NOx) are one of the main atmospheric pollutants. The Selective Catalytic Reduction (SCR) flue gas denitration technology is the most mature NOx control means which is most widely applied in the prior art. The catalyst is the core of the SCR denitration process, and the performance of the catalyst is the key for determining the denitration effect and the economy of an SCR system. Vanadium-based catalysts have long dominated commercial SCR catalysts. In consideration of the active temperature window (300-400 ℃) of the vanadium-based catalyst, the SCR denitration system is generally in a high-ash arrangement mode. Therefore, the catalyst in operation is easily poisoned by toxic components such as alkali metal in the flue gas, so that the service life of the catalyst is greatly shortened, the denitration activity is seriously reduced, even completely inactivated, and the operation cost of a power plant is increased.
According to statistics, the distribution range of the concentration of alkali metals (mainly potassium and sodium) in coal in China is 0-2.40%, and the concentration of the alkali metals in medium-high alkali coal (alkali metals) is 0-2.40%Concentration greater than 0.30%) accounted for 28.94% in the existing coal resources. Except the process of burning coal, the process of burning biomass, fuel oil or burning wastes releases alkali metals, particularly the combustion of biomass, the concentration of the alkali metals is higher, and the concentration of potassium is about 10 to 50 times of that of sodium. In fact, potassium is the most severe poison causing deactivation of vanadium-based catalysts, and the reduction of acidity and redox properties of the catalyst surface caused thereby is the main cause of the reduction of the activity of the catalyst. Therefore, the SCR catalyst potassium poisoning is to remove NO by adopting SCR technology x The severe challenges faced.
Corresponding research schemes are also disclosed in the prior art, for example, CN107185593 discloses a potassium poisoning resistant manganese-based catalyst, which can obviously improve low-temperature denitration activity and catalytic capability, and compared with a common catalyst, the denitration efficiency is obviously improved under the condition of potassium poisoning. However, the manganese-based catalyst is far from the practical application of a power plant, the practical problem is difficult to solve for a long time, and more importantly, the manganese-based low-temperature catalyst is not suitable for the high-ash arrangement type SCR denitration system widely adopted at present. CN113522274 also discloses a potassium poisoning resistant manganese-based catalyst, which has alkali metal poisoning resistance and sulfur dioxide poisoning resistance at a conversion rate of more than 80% at 150 ℃. The manganese-based catalyst is far away from the practical application of a power plant, the practical problem is difficult to solve for a long time, and more importantly, the manganese-based low-temperature catalyst is not suitable for the high-ash arrangement type SCR denitration system widely adopted at present. For another example, CN113996285 discloses a cerium-based catalyst resistant to potassium poisoning, which exhibits excellent denitration performance, but has poor potassium poisoning resistance, and the highest activity under potassium poisoning is only 65-80%, more importantly, the cerium-based catalyst is still in the laboratory development stage, is far from the practical application of the power plant, and is difficult to solve the practical problem in a long time.
Therefore, how to develop a more suitable novel high-activity potassium poisoning resistant vanadium-based catalyst has important practical significance for solving the problem of potassium poisoning of the power plant denitration catalyst in a short time, improving the service life of the catalyst and reducing the denitration cost of the power plant, has a wide application prospect, and is one of the problems to be solved urgently by a plurality of researchers in the industry.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide an SCR denitration catalyst with potassium poisoning resistance and a preparation method thereof. The high-activity potassium poisoning resistance SCR catalyst provided by the invention can enable the catalyst to have poisoning resistance under high-potassium smoke, so that the service life of the catalyst is prolonged.
The invention provides an anti-potassium poisoning SCR denitration catalyst, which comprises a vanadium-based catalyst and Nb doped in the vanadium-based catalyst 2 O 5 ；
The vanadium-based catalyst comprises V 2 O 5 、WO 3 And TiO 2 ；
The Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1.
preferably, the vanadium-based catalyst comprises a commercial vanadium-based catalyst;
in the vanadium-based catalyst, V 2 O 5 The mass content of (A) is 0.3-2%.
Preferably, among said vanadium-based catalysts, WO 3 The mass content of (A) is 2-5%;
in the vanadium-based catalyst, tiO 2 The mass content of (A) is 80-90%.
Preferably, the vanadium-based catalyst also comprises SiO 2 And/or Al 2 O 3 ；
In the vanadium-based catalyst, siO 2 The mass content of (A) is less than 4%;
in the vanadium-based catalyst, al 2 O 3 The mass content of (A) is less than 2%;
the potassium poisoning resistant SCR denitration catalyst is obtained by soaking a vanadium-based catalyst and a niobate solution in equal volumes and then calcining.
The invention provides a preparation method of a potassium poisoning resistant SCR denitration catalyst, which comprises the following steps:
1) Grinding the vanadium-based catalyst to obtain catalyst powder;
2) Soaking the catalyst powder in an isovolumetric niobate solution, and heating and stirring to obtain a solid-liquid mixture;
3) And (3) standing the solid-liquid mixture obtained in the step, drying, and calcining to obtain the potassium poisoning resistant SCR denitration catalyst.
Preferably, the niobium salt comprises niobium chloride and/or niobium bromide;
quality of the niobate solution the concentration is 99.3% -99.9%;
the dipping time is 3-10 h.
Preferably, the catalyst powder is formed by blending a catalyst powder of a first particle size and a catalyst powder of a second particle size;
the first granularity is 60-100 meshes;
the second granularity is 100-300 meshes;
the mass ratio of the catalyst powder of the first particle size to the catalyst powder of the second particle size is (0.5-1.5): 1.
preferably, the heating and stirring temperature is 40-80 ℃;
the solid-liquid mixture is a solid-liquid mixture with trace residual moisture.
Preferably, the standing time is 5-30 h;
the drying temperature is 70-140 ℃;
the drying time is 5-24 h.
Preferably, the calcining temperature is 350-600 ℃;
the calcining time is 3-8 h.
The invention provides an anti-potassium poisoning SCR denitration catalyst, which comprises a vanadium-based catalyst and Nb doped in the vanadium-based catalyst 2 O 5 (ii) a The vanadium-based catalyst comprises V 2 O 5 、WO 3 And TiO 2 (ii) a The Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1. compared with the prior art, the invention particularly selects the vanadium base aiming at the difficult problem of the practical application of the existing potassium poisoning resistant manganese base catalystCatalyst is the direction of improvement. Although similar improved vanadium-based catalysts exist in the prior art, the self-made vanadium-based catalyst is adopted, the universality is poor, although the vanadium-based catalyst is similar to the existing vanadium-based catalyst in component, the performances of the catalyst are different, the loading amount of active metals can cause obvious change of the performances of the catalyst, and the difference is larger after the difference on the catalyst substrate is accumulated. Therefore, the versatility is also poor.
Based on the above, the invention especially designs the SCR denitration catalyst with specific composition and proportion, which is the SCR denitration catalyst with high activity and potassium poisoning resistance, and the SCR denitration catalyst is improved on the basis of the commercial vanadium-based catalyst, has more excellent universality and practicability, and is more convenient for industrial popularization and application. The high-activity potassium poisoning resistance SCR catalyst provided by the invention can enable the catalyst to have poisoning resistance under high-potassium smoke, so that the service life of the catalyst is prolonged. The invention adopts an isometric impregnation method to load a certain content of auxiliary agent niobium on the commercial vanadium-based catalyst, and the finished product is prepared after calcination.
The invention is based on commercial vanadium-based catalyst, has simple formula change and low cost, can be directly used for mass production of catalyst manufacturers, can be applied in a short time, quickly and effectively solves the problem of potassium poisoning of the denitration catalyst of the power plant, has wide application prospect, and particularly has obvious advantages under high-potassium flue gas conditions of garbage power plants, coal power plants burning high sulfur, biomass power plants and the like.
The experimental result shows that the catalyst prepared by the invention has more excellent potassium poisoning resistance and higher denitration efficiency than a commercial catalyst at 350 ℃, wherein the poisoning resistance is enhanced by 10.1-14.9%.
Drawings
FIG. 1 shows the major components of a commercial vanadium-based catalyst according to the present invention.
Detailed Description
For a further understanding of the invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate the features and advantages of the invention and are not intended to limit the invention to the claims.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the invention are not particularly limited in purity, and the invention preferably adopts analytically pure or purity conventional in the field of preparation of SCR denitration catalysts.
The invention provides a potassium poisoning resistant SCR denitration catalyst, which comprises a vanadium-based catalyst and Nb doped in the vanadium-based catalyst 2 O 5 ；
The vanadium-based catalyst comprises V 2 O 5 、WO 3 And TiO 2 2 ；
The Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1.
in the present invention, the Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1, can be (0.8-1.2): 1, preferably (0.9 to 1.1): 1.
in the present invention, the vanadium-based catalyst preferably comprises a commercial vanadium-based catalyst. Specifically, the commercial vanadium-based catalyst can be a commercial vanadium-based catalyst produced by Hua-Eling Qingdao environmental protection technology Limited.
In the present invention, in the vanadium-based catalyst, V 2 O 5 The content of (b) is preferably 0.3% to 2%, more preferably 0.7% to 1.6%, and still more preferably 1.1% to 1.2% by mass.
In the present invention, among the vanadium-based catalysts, WO 3 The content of (b) is preferably 2% to 5%, more preferably 2.5% to 4.5%, and still more preferably 3% to 4% by mass.
In the present invention, tiO is used as the vanadium-based catalyst 2 Is preferably 80 to 90%, more preferably 82 to 88%, and still more preferably 84 to 8%6％。
In the present invention, it is also preferable that SiO is included in the vanadium-based catalyst 2 And/or Al 2 O 3 More preferably SiO 2 Or Al 2 O 3 。
In the present invention, in the vanadium-based catalyst, siO 2 The content of (b) is preferably less than 4%, more preferably less than 3.5%, more preferably less than 3% by mass.
In the present invention, in the vanadium-based catalyst, al 2 O 3 The content by mass of (b) is preferably less than 2%, more preferably less than 1.5%, more preferably less than 1%.
In the invention, the potassium poisoning resistant SCR denitration catalyst is preferably obtained by soaking a vanadium-based catalyst and a niobate solution in equal volumes and then calcining.
In the present invention, for the catalyst formulation, the catalyst performance is strongly affected by the different component ratios, although the formulation components are identical. Even if other components of the catalyst are not changed, the catalyst performance is obviously changed by only changing the loading amount of Nb. Therefore, the optimum loading is different for different catalysts when the same promoter is loaded. The invention adopts the load amount of Nb with specific content, and simultaneously adopts the vanadium-based catalyst which is a catalyst actually used in the power plant at present, has absolute maturity, and has proved by practice that the main components and the component proportion thereof are high.
The invention provides a preparation method of a potassium poisoning resistant SCR denitration catalyst, which comprises the following steps:
1) Grinding the vanadium-based catalyst to obtain catalyst powder;
2) Soaking the catalyst powder in an isovolumetric niobate solution, and heating and stirring to obtain a solid-liquid mixture;
3) And (3) standing the solid-liquid mixture obtained in the step, drying, and calcining to obtain the potassium poisoning resistant SCR denitration catalyst.
According to the invention, firstly, the vanadium-based catalyst is ground to obtain catalyst powder.
In the present invention, the particle size of the catalyst powder may be selected from 60 to 300 mesh, or 70 to 250 mesh, and more preferably 80 to 200 mesh.
Specifically, in the present invention, the catalyst powder is preferably formed by blending a catalyst powder of a first particle size and a catalyst powder of a second particle size.
In the present invention, the first particle size is preferably 60 to 100 mesh, and more preferably 70 to 90 mesh.
In the present invention, the second particle size is preferably 100 to 300 mesh, more preferably 150 to 250 mesh, and still more preferably 180 to 220 mesh.
In the present invention, the mass ratio of the catalyst powder of the first particle size to the catalyst powder of the second particle size is preferably (0.5 to 1.5): 1, more preferably (0.7 to 1.3): 1, more preferably (0.9 to 1.1): 1. specifically, the particle size of the catalyst has certain influence on the physical stability of the catalyst particles in the processes of impregnation, reaction internal diffusion and experimental test, and the invention particularly preferably selects the combination of the particle sizes with two specific proportions. Wherein the second particle size is larger than the first particle size.
The catalyst powder is soaked in an isovolumetric niobate solution and then heated and stirred to obtain a solid-liquid mixture.
In the present invention, the niobium salt preferably includes niobium chloride and/or niobium bromide, more preferably niobium chloride or niobium bromide.
In the present invention, the time for the impregnation is preferably 3 to 10 hours, more preferably 4 to 9 hours, more preferably 5 to 8 hours, and more preferably 6 to 7 hours.
In the present invention, the temperature of the heating and stirring is preferably 40 to 80 ℃, more preferably 45 to 75 ℃, more preferably 50 to 70 ℃, and more preferably 55 to 65 ℃.
In the present invention, the solid-liquid mixture is preferably a solid-liquid mixture in which a trace amount of water remains. Specifically, the mass content of water in the solid-liquid mixture can be 0.1% -10%, or 1% -8%, or 3% -6%.
Finally, the solid-liquid mixture obtained in the step is dried after standing and then calcined to obtain the potassium poisoning resistant SCR denitration catalyst.
In the present invention, the time for the standing is preferably 5 to 30 hours, more preferably 10 to 25 hours, and still more preferably 15 to 20 hours.
In the present invention, the temperature for the drying is preferably 70 to 140 ℃, more preferably 85 to 125 ℃, and more preferably 100 to 110 ℃.
In the present invention, the drying time is preferably 5 to 24 hours, more preferably 9 to 20 hours, and still more preferably 13 to 16 hours.
In the present invention, the temperature of the calcination is preferably 350 to 600 ℃, more preferably 400 to 550 ℃, and more preferably 450 to 500 ℃.
In the present invention, the time for the calcination is preferably 3 to 8 hours, more preferably 4 to 7 hours, and still more preferably 5 to 6 hours.
The invention is a complete and detailed integral technical scheme, and better improves the potassium poisoning resistance and the catalytic performance of the SCR denitration catalyst, and the potassium poisoning resistance SCR denitration catalyst and the preparation method thereof can specifically comprise the following contents:
a preparation method of an SCR denitration catalyst with potassium poisoning resistance,
the commercial vanadium-based catalyst was treated as follows:
(1) Fresh commercial catalyst was thoroughly milled.
(2) A few fresh commercial catalyst powders were weighed.
(3) A quantity of niobium salt was dissolved in deionized water according to mass ratio and fresh commercial catalyst was immersed in an equal volume of niobium salt solution.
(4) Heating at 40-80 deg.c and stirring to obtain solid-liquid mixture with residual water.
(5) Standing the solid-liquid mixture at room temperature for 5-30h, and drying at 70-140 ℃ for 5-24 h.
(6) Fully calcining the mixture for 3 to 8 hours at the temperature of between 350 and 600 ℃ to obtain a finished product.
Specifically, the catalyst is ground to 60 to 300 meshes.
Specifically, the weighed catalyst powder contains two particle sizes of 60 to 100 mesh and 100 to 300 mesh.
Specifically, the niobium salt is NbCl 5 。
In particular, the niobium salt is analytically pure.
Specifically, the catalyst is immersed in a niobate solution of the same volume for 3 to 10 hours.
The invention discloses a formula of an SCR denitration catalyst with potassium poisoning resistance and a preparation method thereof, wherein 1-12% of auxiliary agent niobium is loaded on a commercial vanadium-based catalyst by adopting an isometric impregnation method, and a finished product is prepared after calcination. Compared with commercial vanadium-based catalysts, the catalyst has excellent potassium poisoning resistance, and has obvious advantages under high potassium flue gas conditions of garbage power plants, high-sulfur coal-fired power plants, biomass power plants and the like.
The invention provides a formula of an SCR denitration catalyst with potassium poisoning resistance and a preparation method thereof. The SCR denitration catalyst with specific composition and proportion, which is specially designed by the invention, is an SCR denitration catalyst with high activity and potassium poisoning resistance, is improved on the basis of a commercial vanadium-based catalyst, has more excellent universality and practicability, and is more convenient for industrial popularization and application. The high-activity potassium poisoning resistance SCR catalyst provided by the invention can enable the catalyst to have poisoning resistance under high-potassium smoke, so that the service life of the catalyst is prolonged. The invention adopts an isometric impregnation method to load a certain content of auxiliary agent niobium on the commercial vanadium-based catalyst, and the finished product is prepared after calcination.
The invention is based on commercial vanadium-based catalyst, has simple formula change and low cost, can be directly used for mass production of catalyst manufacturers, can be applied in a short time, quickly and effectively solves the problem of potassium poisoning of the denitration catalyst of the power plant, has wide application prospect, and particularly has obvious advantages under high-potassium flue gas conditions of garbage power plants, coal power plants burning high sulfur, biomass power plants and the like.
The experimental result shows that the catalyst prepared by the invention has more excellent potassium poisoning resistance and higher denitration efficiency than a commercial catalyst at 350 ℃, wherein the poisoning resistance is enhanced by 10.1-14.9%.
In order to further illustrate the present invention, the following detailed description will be made with reference to the following examples, which are provided for illustrating the potassium poisoning resistant SCR denitration catalyst and the preparation method thereof, but it should be understood that the embodiments are implemented on the premise of the technical solution of the present invention, and the detailed implementation manner and the specific operation process are given, which are only for further illustrating the features and advantages of the present invention, but not for limiting the claims of the present invention, and the scope of the present invention is not limited to the following examples.
The catalyst employed in the examples was a commercial vanadium-based honeycomb catalyst in which V was 2 O 5 1% by mass, WO 3 3% by mass and the balance TiO 2 。
Referring to fig. 1, fig. 1 shows the main components of a commercial vanadium-based catalyst used in the present invention.
Example 1
An SCR denitration catalyst formula with potassium poisoning resistance and a preparation method thereof.
(1) A quartz grinding bowl is used for fully grinding a fresh commercial catalyst, and catalyst powder of 60-100 meshes and catalyst powder of 100-300 meshes are respectively screened out.
(2) Catalyst powders of 60 to 100 mesh and 100 to 300 mesh were weighed to 5g, respectively, and sufficiently blended.
(3) 0.152g of NbCl 5 Dissolved in 10ml of deionized water, and 10g of the catalyst powder weighed out was placed in a niobium chloride solution.
(4) Heating at 70 deg.C and stirring to obtain solid-liquid mixture with trace water.
(5) The solid-liquid mixture was allowed to stand at room temperature for 24 hours and then dried at 110 ℃ for 12 hours.
(6) Fully calcining at 400 ℃ for 5 hours to obtain a finished product.
Nb in the finished product 2 O 5 And V 2 O 5 The mass ratio of (1) is 0.75.
Example 2
An SCR denitration catalyst formula with potassium poisoning resistance and a preparation method thereof.
(1) A quartz grinding bowl is used for fully grinding a fresh commercial catalyst, and catalyst powder of 60-100 meshes and catalyst powder of 100-300 meshes are respectively screened out.
(2) Catalyst powders of 60 to 100 mesh and 100 to 300 mesh were weighed to 5g, respectively, and sufficiently blended.
(3) 0.203g of NbCl 5 Dissolved in 10ml of deionized water, and 10g of the catalyst powder weighed out was placed in a niobium chloride solution.
(4) Heating at 70 deg.C and stirring to obtain solid-liquid mixture with trace water.
(5) The solid-liquid mixture was allowed to stand at room temperature for 24 hours and then dried at 110 ℃ for 12 hours.
(6) Fully calcining at 400 ℃ for 5 hours to obtain a finished product.
Nb in the finished product 2 O 5 And V 2 O 5 Is 1:1.
Example 3
An SCR denitration catalyst formula with potassium poisoning resistance and a preparation method thereof.
(1) A quartz grinding bowl is used for fully grinding a fresh commercial catalyst, and catalyst powder of 60-100 meshes and catalyst powder of 100-300 meshes are respectively screened out.
(2) Catalyst powders of 60 to 100 mesh and 100 to 300 mesh were weighed to 5g, respectively, and sufficiently blended.
(3) 0.254g of NbCl 5 Dissolved in 10ml of deionized water, and 10g of the catalyst powder weighed out was placed in a niobium chloride solution.
(4) Heating at 70 deg.C and stirring to obtain solid-liquid mixture with trace water.
(5) The solid-liquid mixture was allowed to stand at room temperature for 24 hours and then dried at 110 ℃ for 12 hours.
(6) Fully calcining at 500 ℃ for 5 hours to obtain a finished product.
Nb in the finished product 2 O 5 And V 2 O 5 The mass ratio of (1) to (2) is 1.25.
The denitration activities of the catalysts prepared in examples 1 to 3 were compared with that of a raw material commercial catalyst, and the denitration activity of the poisoned catalyst was compared with that of a catalyst poisoned with potassium of 0.5 wt%.
The denitration efficiency calculation formula is as follows:
Activity test conditions: 500ppm NO, 500ppm NH 3 、3％ O 2 、N 2 For gas balance, the space velocity is 60,000h -1 The smoke flow is 500ml/min, and the test temperature is 150-450 ℃.
Referring to table 1, table 1 shows comparative data of denitration activity of the catalyst prepared in the example of the present invention and the raw material commercial catalyst.
TABLE 1
As can be seen from Table 1, the catalyst prepared in the examples of the present invention has more excellent potassium poisoning resistance and higher denitration efficiency than the commercial catalyst at 350 ℃, wherein the poisoning resistance is enhanced by 10.1-14.9%.
While the present invention has been described in detail with respect to a formulation of an SCR denitration catalyst having potassium poisoning resistance and a method for preparing the same, the present invention is illustrated in the accompanying drawings by way of specific examples, which are provided to assist in understanding the method and the core concepts of the present invention, including the best mode, and to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any combination thereof. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. The SCR denitration catalyst resisting potassium poisoning is characterized by comprising a vanadium-based catalyst and Nb doped in the vanadium-based catalyst 2 O 5 ；
The vanadium-based catalyst comprises V 2 O 5 、WO 3 And TiO 2 2 ；
The Nb 2 O 5 With V in a vanadium-based catalyst 2 O 5 The mass ratio of (0.75-1.25): 1.
2. the catalyst of claim 1, wherein the vanadium-based catalyst comprises a commercial vanadium-based catalyst;
in the vanadium-based catalyst, V 2 O 5 The mass content of (A) is 0.3-2%.
3. The catalyst of claim 1, wherein in the vanadium-based catalyst, WO 3 The mass content of (A) is 2-5%;
in the vanadium-based catalyst, tiO 2 The mass content of (A) is 80-90%.
4. The catalyst of claim 1, further comprising SiO in the vanadium-based catalyst 2 And/or Al 2 O 3 ；
In the vanadium-based catalyst, siO 2 Is small in mass contentAt a rate of 4%;
in the vanadium-based catalyst, al 2 O 3 The mass content of (A) is less than 2%;
the potassium poisoning resistant SCR denitration catalyst is obtained by soaking a vanadium-based catalyst and a niobate solution in equal volumes and then calcining.
5. A preparation method of a potassium poisoning resistant SCR denitration catalyst is characterized by comprising the following steps:
1) Grinding the vanadium-based catalyst to obtain catalyst powder;
2) Soaking the catalyst powder in an isovolumetric niobate solution, and heating and stirring to obtain a solid-liquid mixture;
3) And (3) standing the solid-liquid mixture obtained in the step, drying, and calcining to obtain the potassium poisoning resistant SCR denitration catalyst.
6. The production method according to claim 5, wherein the niobium salt comprises niobium chloride and/or niobium bromide;
the mass concentration of the niobate solution is 99.3-99.9%;
the dipping time is 3-10 h.
7. The method of claim 5, wherein the catalyst powder is formed by blending a first particle size catalyst powder and a second particle size catalyst powder;
the first granularity is 60-100 meshes;
the second granularity is 100-300 meshes;
the mass ratio of the catalyst powder of the first particle size to the catalyst powder of the second particle size is (0.5-1.5): 1.
8. the preparation method according to claim 5, wherein the temperature for heating and stirring is 40-80 ℃;
the solid-liquid mixture is a solid-liquid mixture with trace residual moisture.
9. The preparation method according to claim 5, wherein the standing time is 5 to 30 hours;
the drying temperature is 70-140 ℃;
the drying time is 5-24 h.
10. The method of claim 5, wherein the temperature of the calcination is 350 to 600 ℃;
the calcining time is 3-8 h.
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