Preparation method and equipment of calcination-free low-temperature denitration catalyst

Abstract

The invention provides a preparation method of a calcination-free low-temperature denitration catalyst and the catalyst, and belongs to the technical field of preparation of denitration catalysts.The method comprises the steps that a strong oxidant is added into a mixed salt solution for a hydrothermal reaction, and an active component oxide is obtained; the preparation method comprises the following steps: adding montmorillonite into deionized water, adding an organic modifier in a stirring state, and carrying out a hydrothermal reaction to obtain organic montmorillonite; the active component oxide and the organic montmorillonite are subjected to ball milling, tabletting and screening, and the calcination-free low-temperature denitration catalyst is obtained. According to the preparation method, montmorillonite modified by an organic modifier is taken as a carrier, an active component oxide is prepared by using an oxidation-reduction method, and the active component oxide is loaded on the carrier by using a ball milling method, so that the obtained MMnTiOx / OMt catalyst can be used for NH3-SCR (Selective Catalytic Reduction) denitration treatment of low-temperature flue gas after dust removal-desulfurization, and the conversion rate of NOx is greater than 95% and the selectivity of N2 is greater than 90% within 100-180 DEG C.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of denitration catalysts, and in particular to a method and equipment for preparing a calcination-free low-temperature denitration catalyst. Background Art

[0002] At present, the most widely used catalyst in domestic industry is vanadium-based catalyst (V 2 O 5 / TiO 2 ),

[0003] V 2 O 5 -WO 3 / TiO 2 However, its active temperature is relatively high and its activity window is relatively narrow (300-400°C). Considering the toxicity of vanadium-based catalysts and the fact that the flue gas temperature is mainly below 300°C, it is very necessary to study catalysts with good denitrification effects under low temperature conditions.

[0004] In recent years, low temperature NH 3 -SCR catalysts are mainly studied around two categories of catalysts: precious metals (Pt, Pd, Rh, Ag, etc.) and transition metal (Mn, Fe, Ni, Cr, V, Co, Cu, etc.) oxides. 3 -SCR catalyst research mainly focuses on transition metal oxides. Mn-based catalysts have excellent NH 3 -SCR denitrification performance has been favored by many scholars. However, due to the complexity of the reaction, the diversity of MnOx forms, the difference in reaction interface and the mutation of reaction conditions, the NH 3 -SCR reaction mechanism has obvious differences. Especially in H 2 O and SO 2 In the coexistence system, Mn-based catalysts are susceptible to H 2 O and SO 2 The reaction process is more complex and changeable.

[0005] Mn-based catalysts are resistant to H 2 O and resistant to SO 2 The "fatal" disadvantage of insufficient Mn-based catalysts has hindered the application of Mn-based catalysts in SCR projects. The temperature of flue gas after dust removal and desulfurization is generally lower than 180°C, SO 2 Content less than 30mg / Nm 3, but the water vapor concentration will not decrease. Under ultra-low temperature conditions, water vapor often exists on the catalyst surface in the form of a liquid film, which can easily cause active site coverage and poisoning and inactivation. Therefore, water resistance is the first issue that needs to be considered in the actual operation of ultra-low temperature SCR. In addition, the preparation of existing denitrification catalysts requires high-temperature roasting, and the process is complex and energy-intensive. Therefore, the development of catalysts with good low-temperature (80-180°C) water resistance and simple preparation process is of great significance to the development of low-temperature NH 3 -SCR technology is of great significance. Summary of the invention

[0006] The present invention aims to provide a method and equipment for preparing a calcination-free low-temperature denitration catalyst, in order to at least partially solve at least one of the above-mentioned technical problems.

[0007] In order to solve the above technical problems, the first aspect of the present invention provides a method for preparing a calcination-free low-temperature denitration catalyst, comprising:

[0008] A strong oxidant is added into the mixed salt solution to carry out a hydrothermal reaction to obtain an active component oxide;

[0009] Adding montmorillonite to deionized water, and adding an organic modifier under stirring, and obtaining organic montmorillonite after hydrothermal reaction;

[0010] The active component oxide and the organic montmorillonite are ball-milled, tablet-pressed and sieved to obtain a calcination-free low-temperature denitrification catalyst.

[0011] According to a preferred embodiment of the present invention, before adding the strong oxidant to the mixed salt solution, the method further comprises:

[0012] The metal salt is dissolved in deionized water to obtain a mixed salt solution.

[0013] According to a preferred embodiment of the present invention, the strong oxidant is sodium percarbonate, and the molar ratio of sodium percarbonate to metal salt is 1:(1-1.5).

[0014] According to a preferred embodiment of the present invention, the metal salt is at least one of manganese salt, titanium salt and other metal salts, cerium salt, iron salt, nickel salt and cobalt salt.

[0015] According to a preferred embodiment of the present invention, the step of adding a strong oxidant to a mixed salt solution for hydrothermal reaction to obtain an active component oxide comprises:

[0016] A strong oxidant is added to the mixed salt solution, the pH is adjusted to 9-10, and a hydrothermal reaction is performed for 2-4 hours to obtain a reactant;

[0017] The reactant is filtered, washed with water, and dried to obtain the active component oxide.

[0018] According to a preferred embodiment of the present invention, the strong oxidant is sodium percarbonate, the hydrothermal reaction temperature is 60-80°C, and the drying temperature of the reactants is 100-120°C.

[0019] According to a preferred embodiment of the present invention, the step of adding montmorillonite into deionized water and adding an organic modifier under stirring to obtain an organic montmorillonite after a hydrothermal reaction comprises:

[0020] adding montmorillonite into deionized water to obtain montmorillonite slurry;

[0021] Adding an organic modifier to the montmorillonite slurry under stirring, and subjecting it to a hydrothermal reaction at 60 to 80° C. for 1 to 3 hours to obtain an intermediate product;

[0022] The intermediate product is filtered and dried at 60-80° C. to obtain organic montmorillonite.

[0023] According to a preferred embodiment of the present invention, the mass concentration of the montmorillonite slurry is 10-20%, and the mass of the organic modifier is 20-30% of the mass of the montmorillonite;

[0024] The organic modifier is at least one of octadecyltrimethylammonium chloride, octadecyldimethylbenzylammonium chloride and dioctadecyldimethylammonium chloride.

[0025] According to a preferred embodiment of the present invention, the organic montmorillonite accounts for 70% to 90% of the total weight of the catalyst, and the active component accounts for 10% to 30% of the total weight of the catalyst. The ball mill has a rotation speed of 200 to 400 r / min.

[0026] In order to solve the above technical problems, the second aspect of the present invention provides a calcination-free low-temperature denitration catalyst, which is prepared by any of the above-mentioned methods for preparing a calcination-free low-temperature denitration catalyst.

[0027] In summary, the preparation method and catalyst of the calcination-free low-temperature denitration catalyst provided by the present invention use montmorillonite modified by an organic modifier as a carrier, use a redox method to prepare an active component oxide, and load the active component oxide onto the carrier by a ball milling method to obtain a MMnTiOx / OMt catalyst that can be used for the denitration of low-temperature flue gas NH after "dust removal-desulfurization". 3 -SCR denitration treatment, NOx conversion rate> 95% within 100-180℃, N 2 Selectivity>90%. Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1. Use 2Na 2 CO 3 ·3H 2 O2 The strong oxidant oxidizes metal ions into active component oxides, eliminating the step of decomposing metal salts into oxides during the high-temperature roasting process in the prior art, greatly reducing energy consumption; and the metal oxides generated by high-temperature roasting are different in structure from the oxides generated by the redox method. The catalyst NH 3 -SCR performance is different.

[0029] 2. The large amount of pore structure and huge specific surface area of ​​montmorillonite can improve the adsorption performance of the catalyst. Cationic surfactants are used to absorb the inorganic cations (such as Na + , Ca 2+ ) was replaced and the introduction of hydrophobic carbon chain organic modification increased the contact angle of montmorillonite and improved the water resistance of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow chart of a method for preparing a calcination-free low-temperature denitration catalyst provided in an embodiment of the present invention;

[0031] Figure 2 These are the performance evaluation results of the calcination-free low-temperature denitration catalysts prepared in Examples 1 to 5 of the present invention. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] The present invention provides a method for preparing a calcination-free low-temperature denitration catalyst. Figure 1 As shown, the method includes:

[0035] S1, adding a strong oxidant to a mixed salt solution for hydrothermal reaction to obtain an active component oxide;

[0036] In this embodiment, the mixed salt solution is obtained by dissolving the metal salt in deionized water in advance. The metal salt can be selected from at least one of manganese salt, titanium salt and other metal salts, cerium salt, iron salt, nickel salt and cobalt salt. The manganese salt is one of manganese nitrate, manganese sulfate and manganese acetate; wherein: the titanium salt is at least one of titanium chloride, titanium sulfate and titanium oxysulfate; the cerium salt is at least one of cerium nitrate, cerium sulfate and cerium chloride; the iron salt is at least one of ferric nitrate, ferrous sulfate and ferrous chloride; the nickel salt is at least one of nickel acetate, nickel nitrate and nickel sulfate; the cobalt salt is at least one of cobalt nitrate, cobalt acetate and cobalt sulfate.

[0037] In a preferred example, the metal salt may include: manganese salt, titanium salt and other metal salts, and the molar ratio of manganese salt, titanium salt and other metal salts is (2-4): (2-5): (0-1).

[0038] In this embodiment, the strong oxidant can be: peroxide, potassium permanganate, etc. Preferably, the strong oxidant is sodium percarbonate (2Na 2 CO 3 ·3H 2 O 2 ), the molar ratio of sodium percarbonate to metal salt is 1:(1~1.5).

[0039] Specifically, this step may include:

[0040] S11, adding a strong oxidant to the mixed salt solution, adjusting the pH to 9-10, and subjecting the solution to a hydrothermal reaction for 2-4 hours to obtain a reactant;

[0041] Preferably, the strong oxidant is sodium percarbonate, and the hydrothermal reaction temperature is 60-80°C.

[0042] S12, filtering the reactants, washing with water, and drying to obtain active component oxides.

[0043] Wherein: the drying temperature of the reactants is 100-120°C.

[0044] In this step, different metal oxides such as Ce, Ni, Ti, Fe, and Co are used to modify the Mn-based catalyst to form active component oxides to increase the NH 3 -SCR activity, thereby improving the shortcomings of Mn-based catalysts in terms of poor water and sulfur resistance. The principle is as follows:

[0045] (1) Using 2Na2 CO 3 ·3H 2 O 2 As a strong oxidant, in the presence of alkaline and strong oxidants, Mn 2+ , Fe 2 + 、Ce 3+ 、Ti 2+ 、Ni 2+ 、Co 2+ Plasma oxidation to MnO 2 , Fe 2 O 3 、CeO 2 、TiO 2 、NiO、Co 3 O 4 The active component oxides do not need further calcination. Compared with other catalyst precursors that need to be calcined at 450-650°C, after montmorillonite is organically modified, when the temperature is greater than 250°C, the organic modifier will decompose and the hydrophobicity of the catalyst will be significantly reduced. The present invention can effectively avoid the high-temperature decomposition of the organic modifier.

[0046] (2) Mn 3+ / 4+ With Ti 3+ / 4+ , Fe 3+ / 4+ 、Ce 3+ / 4+ 、Ni 2+ / 3+ 、Co 3+ / 4+ The synergistic effect of metal ions improves the dispersion and specific surface area of ​​the oxides of the catalyst's active components, causing more structural defects on the catalyst surface, which is beneficial to the generation and migration of active components, enhancing the catalyst's redox ability, and thus effectively improving the catalyst's low-temperature SCR catalytic activity. The specific migration process is as follows:

[0047] Mn 4+ +Ni 2+ Mn 3+ +Ni 3+ ,

[0048] Mn 4+ +Ce 3+ Mn 3+ +Ce 4+ ,

[0049] Mn 4+ +Ti 3+ Mn 3+ +Ti 4+ ,

[0050] Mn 4+ +Co 3+ Mn 3+ +Co 4+ ,

[0051] Mn 4+ +Fe 3+ Mn 3+ +Fe 4+ .

[0052] S2, adding montmorillonite to deionized water, and adding an organic modifier under stirring, and obtaining an organic montmorillonite after a hydrothermal reaction;

[0053] Specifically, this step may include:

[0054] S21, adding montmorillonite to deionized water to obtain montmorillonite slurry;

[0055] The mass concentration of the montmorillonite slurry is 10-20%.

[0056] S22, adding an organic modifier to the montmorillonite slurry under stirring, and subjecting the mixture to a hydrothermal reaction at 60 to 80° C. for 1 to 3 hours to obtain an intermediate product;

[0057] The organic modifier is at least one of octadecyl trimethyl ammonium chloride, octadecyl dimethyl benzyl ammonium chloride and dioctadecyl dimethyl ammonium chloride. The mass of the organic modifier is 20-30% of the mass of the montmorillonite.

[0058] S23, filtering the intermediate product, and drying it at 60-80° C. to obtain organic montmorillonite.

[0059] In this step, montmorillonite has cation exchangeability, and the inorganic cations (such as Na + , Ca2 + ), increasing the interlayer spacing of montmorillonite. Since the Si-O and Al-O groups in montmorillonite have strong polarity, and the cations between the montmorillonite layers also have strong hydration ability, the introduction of hydrophobic carbon chain organic modification increases the contact angle of montmorillonite and improves the water resistance of the catalyst carrier.

[0060] S3, ball-milling, tableting and sieving the active component oxide and the organic montmorillonite to obtain a calcination-free low-temperature denitrification catalyst.

[0061] The organic montmorillonite accounts for 70% to 90% of the total weight of the catalyst, and the active component accounts for 10% to 30% of the total weight of the catalyst. The ball mill has a rotation speed of 200 to 400 r / min.

[0062] The preparation method of the calcination-free low-temperature denitration catalyst provided by the present invention is described in detail below through specific examples.

[0063] Example 1

[0064] 1) Weigh 14.69 g of manganese acetate and 14.39 g of titanium sulfate and dissolve them in 40.00 g of deionized water, and stir to obtain a mixed salt solution;

[0065] 2) Weigh 67.76 g of sodium percarbonate and slowly add it to the mixed salt solution under stirring until the pH value is ≈ 9, react in a water bath at 60° C. for 2 h, filter, wash with water until the pH value is neutral, and dry at 100° C. to obtain the active component oxide;

[0066] 3) Weigh 50 g of montmorillonite (Mt) and add it to 200 mL of deionized water, add 12.50 g of dioctadecyl dimethyl ammonium chloride under stirring, react in a water bath at 60° C. for 2 h, filter, and dry at 80° C. to obtain organic montmorillonite (OMt);

[0067] 4) Weigh 10.00 g of the active component oxide from step 2) and 45.00 g of the organic montmorillonite from step 3), pour them into a ball mill, mill them at a speed of 300 r / min for 2 h, press them into tablets, and sieve out 20-40 mesh particles to obtain the catalyst MnTiOx / OMt.

[0068] Example 2

[0069] 1) Weigh 7.35 g of manganese acetate, 9.00 g of titanium sulfate, and 3.03 g of ferric nitrate, dissolve them in 40.00 g of deionized water, and stir to obtain a mixed salt solution;

[0070] 2) Weigh 61.48 g of sodium percarbonate and slowly add it to the mixed salt solution under stirring until pH ≈ 9, react in a water bath at 60° C. for 2 h, filter, wash with water until pH is neutral, and dry at 100° C. to obtain the active component oxide;

[0071] 3) Weigh 50 g of montmorillonite (Mt) and add it to 200 mL of deionized water, add 12.50 g of dioctadecyl dimethyl ammonium chloride under stirring, react in a water bath at 60° C. for 2 h, filter, and dry at 80° C. to obtain organic montmorillonite (OMt);

[0072] 4) Weigh 10.00 g of the active component oxide of step 2) and 45.00 g of the organic montmorillonite of step 3), pour them into a ball mill, mill them at a speed of 300 r / min for 2 h, press them into tablets, and sieve out 20-40 mesh particles to obtain the catalyst FeMnTiOx / OMt.

[0073] Example 3

[0074] 1) Weigh 7.35 g of manganese acetate, 9.00 g of titanium sulfate, and 3.26 g of cerium nitrate, dissolve them in 40.00 g of deionized water, and stir to obtain a mixed salt solution;

[0075] 2) Weigh 61.48 g of sodium percarbonate and slowly add it to the above mixed salt solution under stirring until pH ≈ 9, react in a 60° C. water bath for 2 h, filter, wash with water until pH is neutral, and dry at 100° C. to obtain the active component oxide;

[0076] 3) Weigh 50 g of montmorillonite (Mt) and add it to 200 mL of deionized water, add 12.50 g of dioctadecyl dimethyl ammonium chloride under stirring, react in a water bath at 60° C. for 2 h, filter, and dry at 80° C. to obtain organic montmorillonite (OMt);

[0077] 4) Weigh 10.00 g of the active component oxide from step 2) and 45.00 g of the organic montmorillonite from step 3), pour them into a ball mill, mill them at a speed of 300 r / min for 2 h, press them into tablets, and sieve out 20-40 mesh particles to obtain the catalyst CeMnTiOx / OMt.

[0078] Example 4

[0079] 1) Weigh 7.35 g of manganese acetate, 9.00 g of titanium sulfate, and 2.18 g of nickel nitrate, dissolve them in 40.00 g of deionized water, and stir to obtain a mixed salt solution;

[0080] 2) Weigh 61.48 g of sodium percarbonate and slowly add it to the mixed salt solution under stirring until pH ≈ 9, react in a water bath at 60° C. for 2 h, filter, wash with water until pH is neutral, and dry at 100° C. to obtain the active component oxide;

[0081] 3) Weigh 50 g of montmorillonite (Mt) and add it to 200 mL of deionized water, add 12.50 g of dioctadecyl dimethyl ammonium chloride under stirring, react in a water bath at 60° C. for 2 h, filter, and dry at 80° C. to obtain organic montmorillonite (OMt);

[0082] 4) Weigh 10.00 g of the active component oxide of step 2) and 45.00 g of the organic montmorillonite of step 3), pour them into a ball mill, mill them at a speed of 300 r / min for 2 h, press them into tablets, and sieve out 20-40 mesh particles to obtain the catalyst NiMnTiOx / OMt.

[0083] Example 5

[0084] 1) Weigh 7.35 g of manganese acetate, 9.00 g of titanium sulfate, and 2.18 g of cobalt nitrate, dissolve them in 40.00 g of deionized water, and stir to obtain a mixed salt solution;

[0085] 2) Weigh 61.48 g of sodium percarbonate and slowly add it to the mixed salt solution under stirring until pH ≈ 9, react in a water bath at 60° C. for 2 h, filter, wash with water until pH is neutral, and dry at 100° C. to obtain the active component oxide;

[0086] 3) Weigh 50 g of montmorillonite (Mt) and add it to 200 mL of deionized water, add 12.50 g of dioctadecyl dimethyl ammonium chloride under stirring, react in a water bath at 60° C. for 2 h, filter, and dry at 80° C. to obtain organic montmorillonite (OMt);

[0087] 4) Weigh 10.00 g of the active component oxide from step 2) and 45.00 g of the organic montmorillonite from step 3), pour them into a ball mill, mill them at a speed of 300 r / min for 2 h, press them into tablets, and sieve out 20-40 mesh particles to obtain the catalyst CoMnTiOx / OMt.

[0088] The catalysts prepared in the above five examples were heated to 500 ppm NO, 500 ppm NH 3 , 8% O 2 , 8% CO 2 , 20ppmSO 2 , water vapor content is 10%, and the remaining gas is N 2 , the performance was evaluated under the condition of airspeed 10000h-1, and the results are as follows Figure 2 shown.

[0089] Depend on Figure 2 It can be seen that the catalyst prepared by the method for preparing the calcination-free low-temperature denitration catalyst provided by the present invention has a NOx conversion rate of >95% within 100-180°C, and N 2 Selectivity>90%; can be used for low-temperature flue gas NH after "dust removal-desulfurization" 3 -SCR denitrification treatment.

[0090] Based on the above-mentioned method for preparing a calcination-free low-temperature denitration catalyst, the present invention further provides a calcination-free low-temperature denitration catalyst, which is prepared by any one of the above-mentioned methods for preparing a calcination-free low-temperature denitration catalyst.

[0091] It should be clear that the present invention is not limited to the specific structures and processes described above and shown in the figures. For the sake of simplicity, a detailed description of the known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0092] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0093] The above description is only a specific implementation mode of the present invention. It should be understood that the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A method for preparing a calcination-free low-temperature denitration catalyst, characterized in that: include: A strong oxidant is added into the mixed salt solution to carry out a hydrothermal reaction to obtain an active component oxide; Adding montmorillonite to deionized water, and adding an organic modifier under stirring, and obtaining organic montmorillonite after hydrothermal reaction; The active component oxide and the organic montmorillonite are ball-milled, tablet-pressed and sieved to obtain a calcination-free low-temperature denitrification catalyst.

2. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 1, characterized in that: Before adding the strong oxidant to the mixed salt solution, the method further comprises: The metal salt is dissolved in deionized water to obtain a mixed salt solution.

3. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 2, characterized in that: The strong oxidant is sodium percarbonate, and the molar ratio of sodium percarbonate to metal salt is 1:(1-1.5).

4. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 2, characterized in that: The metal salt is at least one of manganese salt, titanium salt and other metal salts, cerium salt, iron salt, nickel salt and cobalt salt.

5. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 1, characterized in that: The method of adding a strong oxidant to a mixed salt solution to perform a hydrothermal reaction to obtain an active component oxide comprises: A strong oxidant is added to the mixed salt solution, the pH is adjusted to 9-10, and a hydrothermal reaction is performed for 2-4 hours to obtain a reactant; The reactant is filtered, washed with water, and dried to obtain the active component oxide.

6. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 4, characterized in that: The strong oxidant is sodium percarbonate, the hydrothermal reaction temperature is 60-80°C, and the drying temperature of the reactants is 100-120°C.

7. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 1, characterized in that: The method comprises adding montmorillonite into deionized water, adding an organic modifier under stirring, and performing a hydrothermal reaction to obtain an organic montmorillonite; comprising: adding montmorillonite into deionized water to obtain montmorillonite slurry; Adding an organic modifier to the montmorillonite slurry under stirring, and subjecting it to a hydrothermal reaction at 60 to 80° C. for 1 to 3 hours to obtain an intermediate product; The intermediate product is filtered and dried at 60-80° C. to obtain organic montmorillonite.

8. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 7, characterized in that: The mass concentration of the montmorillonite slurry is 10-20%, and the mass of the organic modifier is 20-30% of the mass of the montmorillonite; The organic modifier is at least one of octadecyltrimethylammonium chloride, octadecyldimethylbenzylammonium chloride and dioctadecyldimethylammonium chloride.

9. The method for preparing a calcination-free low-temperature denitration catalyst according to claim 1, characterized in that: The organic montmorillonite accounts for 70% to 90% of the total weight of the catalyst, and the active component accounts for 10% to 30% of the total weight of the catalyst. The ball mill has a rotation speed of 200 to 400 r / min.

10. A calcination-free low-temperature denitration catalyst, characterized in that: The catalyst is prepared by the method for preparing a calcination-free low-temperature denitration catalyst as described in any one of claims 1 to 9.

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