Denitration catalyst and preparation method thereof
By optimizing the proportion of transition metal oxides, porous materials and alkali additives, the existing denitrification catalysts have been solved, with high cost, narrow temperature window and low efficiency, and a high-efficiency and low-cost flue gas denitrification effect has been achieved.
Patent Information
- Application Number
- CN202510364992.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-05-30
AI Technical Summary
The existing denitrification catalyst has high production cost, narrow reaction temperature window and low denitrification efficiency.
Using transition metal oxides, porous materials and alkali additives as raw materials, through optimized ratios and process treatment, a denitrification catalyst with a wide range of application, high catalytic denitrification efficiency and low cost are prepared.
It has achieved efficient removal of NOx in the flue gas within the temperature range of 200-400℃, and the denitrification efficiency can reach more than 90%, reducing production costs.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of flue gas denitrification, and particularly relates to a denitrification catalyst and a preparation method thereof. Background Art
[0002] With the acceleration of the industrialization process, the emissions of nitrogen oxides (NO x ) increase year by year, causing serious pollution to the atmospheric environment. The existing denitrification technologies mainly include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), etc. However, these technologies have problems such as high catalyst cost, narrow reaction temperature window, and low denitrification efficiency. Therefore, it is of great significance to develop a new type of denitrification agent with high efficiency, low cost, and strong adaptability. Summary of the Invention
[0003] The present application provides a denitrification catalyst and a preparation method thereof, aiming to solve the problems of high production cost, narrow reaction temperature window, and low denitrification efficiency of the existing denitrification catalysts.
[0004] The first aspect of the present application provides a denitrification catalyst, comprising the following raw materials in parts by weight: 10 - 30 parts of transition metal oxide, 50 - 80 parts of porous material, and 5 - 15 parts of alkali promoter.
[0005] According to some embodiments of the denitrification catalyst of the present application, it comprises the following raw materials in parts by weight: 10 - 15 parts of transition metal oxide, 75 - 80 parts of porous material, and 8 - 12 parts of alkali promoter.
[0006] According to some embodiments of the denitrification catalyst of the present application, the transition metal oxide includes one or more of Fe 2 O 3 , CuO, and MnO 2 .
[0007] According to some embodiments of the denitrification catalyst of the present application, the porous material includes one or more of activated carbon, molecular sieve, and diatomite.
[0008] According to some embodiments of the denitrification catalyst of the present application, the alkali promoter includes K 2 CO 3 and / or CaO.
[0009] The second aspect of the present application provides a preparation method of the denitrification catalyst described in the first aspect of the present application, comprising the following steps:
[0010] (1) Mix the transition metal oxide, porous material, alkali promoter, and water to obtain a mixed material;
[0011] (2) Extrude the mixture described in step (2) into a formed body, and then successively perform drying and calcination treatments to obtain the denitration catalyst.
[0012] According to some embodiments of the preparation method of the denitration catalyst described in the present application, in step (1), the mass ratio of the total amount of the transition metal oxide, the porous material, and the alkali promoter to water is: 1:(0.5 - 1).
[0013] According to some embodiments of the preparation method of the denitration catalyst described in the present application, in step (2), the extrusion forming is into granular or honeycomb shape.
[0014] According to some embodiments of the preparation method of the denitration catalyst described in the present application, in step (2), the drying temperature is 100 - 150 °C, and the drying time is 2 - 4 h.
[0015] According to some embodiments of the preparation method of the denitration catalyst described in the present application, in step (2), the calcination temperature is 300 - 600 °C, and the calcination time is 2 - 6 h.
[0016] The beneficial effects of the present application include: The denitration catalyst described in the present application uses a transition metal oxide and a porous material as raw materials. Under the action of an alkali promoter, by optimizing the dosage ratio of the transition metal oxide and the porous material, a denitration catalyst with a wide application range, high catalytic denitration efficiency, and low cost is obtained.
[0017] The denitration catalyst described in the present application is applicable to various flue gas denitration scenarios, such as coal-fired power plants, steel plants, cement plants, etc. The denitration catalyst can efficiently remove NOx in the flue gas within the temperature range of 200 - 400 °C, and the denitration efficiency can reach more than 90%. Specific Embodiments
[0018] The embodiments of the present invention are described in detail below. The examples of the embodiments are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.
[0019] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0020] An embodiment of the present application provides a denitration catalyst, which comprises the following raw materials in parts by weight: 10-30 parts of transition metal oxide, 50-80 parts of porous material, and 5-15 parts of alkali promoter.
[0021] The transition metal oxide has the characteristics of high catalytic activity, good stability and controllability.
[0022] The porous material has a high specific surface area. As a carrier of the catalyst, it can provide more reaction surfaces for reactant molecules to contact and react on its surface.
[0023] The denitration catalyst of the present application uses transition metal oxide and porous material as raw materials. Under the action of an alkali promoter, by optimizing the dosage ratio of the transition metal oxide and the porous material, a denitration catalyst with a wide application range, high catalytic denitration efficiency and low cost is obtained.
[0024] In some embodiments of the present application, it comprises the following raw materials in parts by weight: 10-15 parts of transition metal oxide, 75-80 parts of porous material, and 8-12 parts of alkali promoter.
[0025] In some embodiments of the present application, the transition metal oxide includes Fe 2 O 3 , CuO and MnO 2 or one or more of them.
[0026] In some embodiments of the present application, the porous material includes one or more of activated carbon, molecular sieve and diatomite.
[0027] Activated carbon is prepared by pyrolysis and activation of carbon-containing raw materials such as wood, coal and petroleum coke. It has a developed pore structure, a large specific surface area and rich surface chemical groups. It is a general term for carbon materials with strong specific adsorption ability.
[0028] Molecular sieve is a synthetic hydrated aluminosilicate (zeolite) or natural zeolite with the function of screening molecules. It has many uniformly sized pores and a neatly arranged pore structure. Molecular sieves with different pore sizes separate molecules of different sizes and shapes. It has the advantages of strong adsorption ability, high selectivity and high temperature resistance.
[0029] Diatomite is a biogenic siliceous sedimentary rock with a lightweight porous structure. It is mainly formed by the accumulation of the remains of ancient diatoms and contains a small amount of clay minerals or volcanic ash. While having excellent adsorption performance, it has high chemical stability and thermal stability.
[0030] In some embodiments of the present application, the alkali promoter includes K 2 CO 3 and / or CaO.
[0031] The embodiment of the present application also provides a preparation method of the denitration catalyst described in the first aspect of the present application, including the following steps:
[0032] (1) Mix the transition metal oxide, porous material, alkali promoter and water to obtain a mixed material;
[0033] (2) Extrude the mixed material obtained in step (2) into a formed body, and then successively carry out drying and calcination treatments to obtain the denitration catalyst.
[0034] The preparation method described in the present application has a simple process and low production cost.
[0035] In some embodiments of the present application, in step (1), the mass ratio of the total amount of the transition metal oxide, porous material and alkali promoter to water is: 1:(0.5 - 1), such as 1:0.5, 1:0.8, 1:0.9, 1:1, etc.
[0036] In some embodiments of the present application, in step (2), the extrusion forming is to extrude into granular or honeycomb shape.
[0037] In some embodiments of the present application, in step (2), the drying temperature is 100 - 150 °C, such as 100 °C, 110 °C, 120 °C, 150 °C, etc., and the drying time is 2 - 4 h, such as 2 h, 3 h, 4 h, etc.
[0038] In some embodiments of the present application, in step (2), the calcination temperature is 300 - 600 °C, such as 300 °C, 380 °C, 430 °C, 510 °C, 580 °C, 600 °C, etc., and the calcination time is 2 - 6 h, such as 2 h, 3 h, 5 h, 6 h, etc.
[0039] The technical solution of the present application will be further described below in conjunction with specific embodiments.
[0040] Example 1
[0041] A denitration catalyst, including the following raw materials in parts by weight: transition metal oxide Fe 2 O 3 10 g, activated carbon 80 g, CaO 8 g.
[0042] The preparation method of the denitration catalyst described in Example 1 includes the following steps:
[0043] (1) Mix the transition metal oxide, porous material, alkali promoter and water, wherein the mass ratio of the total amount of the transition metal oxide, porous material and alkali promoter to water is 1:0.8 to obtain a mixed material;
[0044] (2) Extrude the mixture described in step (1) into granules, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0045] Example 2
[0046] The difference between the denitration catalyst described in Example 2 and the denitration catalyst described in Example 1 is only that the addition amount of the transition metal oxide in the preparation process of the denitration catalyst described in Example 2 is different from that in Example 1.
[0047] The specific operation steps include:
[0048] A denitration catalyst, comprising the following raw materials in parts by weight: transition metal oxide Fe 2 O 3 15 g, activated carbon 80 g, CaO 8 g.
[0049] The preparation method of the denitration catalyst described in Example 2 includes the following steps:
[0050] (1) Mix the transition metal oxide, porous material, alkali promoter and water, wherein the total amount of the transition metal oxide, porous material and alkali promoter and the mass ratio of water is 1:0.8: to obtain a mixture;
[0051] (2) Extrude the mixture described in step (1) into granules, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0052] Example 3
[0053] The difference between the denitration catalyst described in Example 3 and the denitration catalyst described in Example 1 is only that the addition amount of the transition metal oxide in the preparation process of the denitration catalyst described in Example 3 is different from that in Example 1.
[0054] The specific operation steps include:
[0055] A denitration catalyst, comprising the following raw materials in parts by weight: transition metal oxide Fe 2 O 3 30 g, activated carbon 80 g, CaO 8 g.
[0056] The preparation method of the denitration catalyst described in Example 3 includes the following steps:
[0057] (1) Mix the transition metal oxide, porous material, alkali promoter and water, wherein the total amount of the transition metal oxide, porous material and alkali promoter and the mass ratio of water is 1:0.8: to obtain a mixture;
[0058] (2) Extrude the mixture described in step (1) into granular form, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0059] Example 4
[0060] The difference between the denitration catalyst described in Example 4 and the denitration catalyst described in Example 1 is only that in the preparation process of the denitration catalyst described in Example 4, the transition metal oxide MnO 2 is used instead of Fe 2 O 3 .
[0061] The specific operation steps include:
[0062] A denitration catalyst, comprising the following raw materials in parts by weight: transition metal oxide MnO 2 10 g, activated carbon 80 g, CaO 8 g.
[0063] The preparation method of the denitration catalyst described in Example 4 includes the following steps:
[0064] (1) Mix the transition metal oxide, porous material, alkali promoter and water, wherein the total amount of the transition metal oxide, porous material and alkali promoter and the mass ratio of water is 1:0.8: to obtain a mixture;
[0065] (2) Extrude the mixture described in step (1) into granular form, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0066] Example 5
[0067] The difference between the denitration catalyst described in Example 5 and the denitration catalyst described in Example 1 is only that in the preparation process of the denitration catalyst described in Example 5, the transition metal oxide CuO is used instead of Fe 2 O 3 .
[0068] The specific operation steps include:
[0069] A denitration catalyst, comprising the following raw materials in parts by weight: transition metal oxide CuO 10 g, activated carbon 80 g, CaO 8 g.
[0070] The preparation method of the denitration catalyst described in Example 5 includes the following steps:
[0071] (1) Mix the transition metal oxide, porous material, alkali promoter and water, wherein the total amount of the transition metal oxide, porous material and alkali promoter and the mass ratio of water is 1:0.8: to obtain a mixture;
[0072] (2) Extrude the mixture described in step (1) into granules, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0073] Comparative Example 1
[0074] The difference between the denitration catalyst described in Comparative Example 1 and the denitration catalyst described in Example 1 is only that no raw material alkali assistant is added during the preparation process of the denitration catalyst described in Comparative Example 1.
[0075] The specific operation steps include:
[0076] A denitration catalyst, comprising raw materials in the following parts by weight: transition metal oxide Fe 2 O 3 10 g, activated carbon 80 g.
[0077] The preparation method of the denitration catalyst described in Comparative Example 1 includes the following steps:
[0078] (1) Mix the transition metal oxide, porous material and water, wherein the mass ratio of the total amount of the transition metal oxide and porous material to water is 1:0.8: to obtain a mixture;
[0079] (2) Extrude the mixture described in step (1) into granules, then dry it at a temperature of 100 °C for 3 h, and then calcine it at a temperature of 500 °C for 5 h to obtain the denitration catalyst.
[0080] Comparative Example 2
[0081] The difference between the denitration catalyst described in Comparative Example 2 and the denitration catalyst described in Example 1 is only that sodium hydroxide is used instead of CaO alkali assistant during the preparation process of the denitration catalyst described in Comparative Example 2.
[0082] Performance study of the denitration catalysts described in Examples 1-5 and Comparative Examples 1-2 of this application:
[0083] The simulated flue gas atmosphere includes 1000 ppm NO, 1000 ppm NH 3 , O with a volume content of 10% 2 and balance gas N 2 , and in the temperature range of 300-350 °C, the catalytic performances of the denitration catalysts described in Examples 1-5 and Comparative Examples 1-2 are respectively tested, and the test results are shown in Table 1.
[0084] Table 1
[0085]
[0086]
[0087] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the scope of protection of the present invention.
Claims
1. A denitration catalyst, characterized in that: The invention comprises the following raw materials in parts by weight: 10-30 parts of transition metal oxide, 50-80 parts of porous material and 5-15 parts of alkali auxiliary agent.
2. The denitration catalyst according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 10-15 parts of transition metal oxide, 75-80 parts of porous material and 8-12 parts of alkali auxiliary agent.
3. The denitration catalyst according to claim 1, characterized in that: The transition metal oxide includes one or more of Fe2O3, CuO and MnO2.
4. The denitration catalyst according to claim 1, characterized in that: The porous material includes one or more of activated carbon, molecular sieve and diatomaceous earth.
5. The denitration catalyst according to claim 1, characterized in that: The alkali auxiliary agent includes K2CO3 and / or CaO.
6. The method for preparing the denitration catalyst according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) mixing a transition metal oxide, a porous material, an alkali additive and water to obtain a mixture; (2) Extruding the mixed material in step (1) into a shape, and then drying and calcining the mixture in sequence to obtain the denitration catalyst.
7. The method for preparing a denitration catalyst according to claim 6, characterized in that: In step (1), the mass ratio of the total amount of the transition metal oxide, the porous material and the alkali auxiliary agent to water is: 1:(0.5-1).
8. The method for preparing a denitration catalyst according to claim 6, characterized in that: In step (2), the extrusion molding is extrusion into granular or honeycomb shapes.
9. The method for preparing a denitration catalyst according to claim 6, characterized in that: In step (2), the drying temperature is 100-150° C., and the drying time is 2-4 hours.
10. The method for preparing a denitration catalyst according to claim 6, characterized in that: In step (2), the calcination temperature is 300-600° C., and the calcination time is 2-6 hours.